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  • 1
    Electronic Resource
    Electronic Resource
    Intraspecific physiological variability of the gastropod Littorina saxatilis related to the vertical shore gradient in the White and North Seas (2000)
    Springer
    Marine biology 137 (2000), S. 297-308 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Physiological responses to desiccation and temperature stress as well as behavioural responses to fast and abrupt environmental changes were investigated in high- and low-shore Littorina saxatilis (Olivi) from several populations from the White and North Seas. Variations in evaporation rates, resistance to air exposure and to acute and chronic temperature stress between animals from different shore levels were similar in White and North Sea periwinkles, consistent with the adaptive nature of these variations. High-shore snails were found to be able to conserve body water reserves better, to resist higher temperatures and to survive longer under conditions of combined temperature and desiccation stress than their low-shore counterparts. In a temperature range of 25 to 35 °C, the rate of evaporative water loss was positively correlated with temperature in low-shore snails while being largely temperature-independent in high-shore snails. Median lethal time during air exposure in L. saxatilis was negatively but not linearly related to the temperature of exposure. In a temperature range of 30 to 38 °C, the resistance to heat exposure in air was only slightly dependent on the temperature, with Q 10 = 1.4 for the median lethal time; the heat resistance dropped drastically at temperatures above 38 °C, with Q 10 = 593.8. This suggests different mechanisms of temperature resistance in different parts of the studied temperature range. In contrast, behavioural response to extreme salinity fluctuations was not uniform in the high- and low-shore periwinkles from the White and North Seas, which may reflect specific environmental conditions at different shore levels in the two areas studied. Observed physiological and behavioural variations are discussed from the viewpoint of different adaptive strategies employed by eulittoral and eulittoral-fringe animals within populations of a single species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270000343
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  • 2
    Electronic Resource
    Electronic Resource
    Residential weekends for client families as an aid to case management
    Amsterdam : Elsevier
    Child Abuse & Neglect 5 (1981), S. 309-315 
    Details
    ISSN: 0145-2134
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Psychology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0145-2134(81)90014-4
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  • 3
    Electronic Resource
    Electronic Resource
    Comment on "Surface-emitting second-harmonic generator by intersubband transition in asymmetric quantum wells with slab waveguide [Appl. Phys. Lett. 62, 1502 (1993)] (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 800-800 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111963
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  • 4
    Electronic Resource
    Electronic Resource
    Second-harmonic generation in nonbirefringent semiconductor optical microcavities (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 6042-6045 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We analyze the second-harmonic generation process in a microcavity of optical nonlinear material. We show that, in the case when the cavity thickness is much smaller than the material coherence length and for sufficiently high finesses, no phase match procedures are necessary to obtain a quite large optical conversion yield. It is thus possible to capitalize on the large optical nonlinear susceptibilities of III-V or II-VI materials though these compounds are not birefringent. It is shown that by adjusting mirror reflectivity phases it is possible to obtain doubly resonant cavities in which there is no phase mismatch between pump and harmonic waves. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360543
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  • 5
    Electronic Resource
    Electronic Resource
    Photonic band gaps and holography (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 60-64 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photonic band gap materials are holograms with extremely high refractive index contrasts. The refractive index function can be approximated by a small number of plane waves, as a consequence of the photonic crystal periodicity. Photonic crystals can hence be constructed with a simple holographic recording of a very small number of optical plane waves, and appear in this regard as the simplest holograms. Various photonic band gap structures are theoretically analysed and those concepts are illustrated experimentally with the fabrication of a two-dimensional triangular lattice in GaAs. The extension of the method to the three-dimensional diamond structure is discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365849
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  • 6
    Electronic Resource
    Electronic Resource
    Photoluminescence of a third order mode optically pumped semiconductor laser structure (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1262-1267 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Semiconductor lasers with third order waveguide mode emission are a promising way in which to achieve microsources of twin photons. The transport of electrons and holes in these particular structures is a critical issue. The temperature and pumping energy dependence of the photoluminescence spectra of a semiconductor structure specially designed for third order mode emission at 775 nm is studied. The analyses show that transfer of carriers from satellite double heterojunctions to the quantum well through a 140 nm Al0.50Ga0.50As barrier is very efficient, and the population inversion required for lasing is always obtained first in the quantum well rather than in the double heterojunctions at both low and room temperature. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1489093
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  • 7
    Electronic Resource
    Electronic Resource
    Parametric fluorescence in oxidized aluminum gallium arsenide waveguides (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3758-3760 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Parametric fluorescence in low-loss oxidized aluminum gallium arsenide heterostructure waveguides is quantitatively analyzed. A parametric fluorescence efficiency as high as 6×10−7 W/W has been measured in a 3.2-mm-long waveguide. This corresponds to a normalized conversion efficiency, scaled with the waveguide length, of about 1000% cm−2 W−1, eight times higher than with LiNbO3 waveguides. This opens the perspective of a microoptical parametric oscillation threshold below 100 mW. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1424063
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  • 8
    Electronic Resource
    Electronic Resource
    Room temperature InAsSb photovoltaic midinfrared detector (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 397-399 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An InAs0.91Sb0.09 p-i-n photovoltaic midinfrared detector grown by molecular beam epitaxy and operating at room temperature is presented. An R0A of 1.05 Ω cm2 at 250 K and 0.12 Ω cm2 at 295 K has been achieved, resulting in a detectivity of 4.5×109 cmHz/W at 3.39 μm and 250 K. The quality of the active region material ensures a sufficiently low generation-recombination current. Room temperature performances are limited by the diffusion of holes from the active region through the confining barriers. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126988
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  • 9
    Electronic Resource
    Electronic Resource
    Room-temperature quantum well infrared modulator using a Schottky diode (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1904-1906 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A reverse biased Schottky diode is used to deplete the population in quantum wells and to modulate the intersubband absorption coefficient. This middle infrared electro-optic modulator works at room temperature. A waveguide geometry is demonstrated, with only six quantum wells. The 14% modulation could easily be enhanced by optimizing the quantum well overlap with the optical guided mode of the waveguide. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116289
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  • 10
    Electronic Resource
    Electronic Resource
    Finite-element Maxwell's equations modeling of etched air/dielectric Bragg mirrors (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 5300-5304 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The importance of diffraction losses in etched air/GaAs Bragg mirrors in waveguides is theoretically evaluated. A complete three-dimensional resolution of the Maxwell equations by a finite element method is performed, and shows the great importance of diffraction into the substrate. Two cases are distinguished: the weak guiding case, where the index contrast between waveguide and substrate is low (example: GaAs/AlAs), and the strong guiding case where this contrast is high, thanks to the use of lower refractive index substrates, such as oxidized AlAs. The latter solution is found to be very promising since the diffraction losses into the substrate are practically eliminated. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366295
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