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  • 1990-1994  (8)
  • 1990  (8)
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  • 1990-1994  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 475-477 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dependence of the intersubband transitions on pressure in strained In0.15Ga0.85As/GaAs multiple quantum wells has been studied in two samples with well widths of 8 and 15 nm, respectively, with photomodulated transmission spectroscopy by using a diamond anvil cell. The pressure coefficients of the energies for the intersubband transitions were found to depend significantly on the well widths and to be smaller than that of the band gap of constituents in bulk form. These results suggested that the critical thickness for strained In0.15Ga0.85As/GaAs layer should be smaller than 15 nm.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1880-1882 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have found a very unusual exciton line shape in the vicinity of n=2 heavy hole states (HH2) of GaAs/AlxGa1−xAs superlattices. The excitonic structure consisting of a step, a sharp peak, and a broad asymmetric hump results from valence-band mixing between HH2 and n=1 light hole states, in conjunction with subband dispersion due to well-to-well coupling of electrons and holes. In quantum well samples with negligible subband dispersion, a distinctly different exciton line shape is observed. The observed line shape is well fitted by a theory recently reported by Chu and Chang [Phys. Rev. B 39, 10861 (1989)].
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 643-644 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental investigation of picosecond laser propagation in a submillimeter liquid-core waveguide is presented. It is observed that the pump is spectrally broadened towards its Stokes frequency upon passing through the waveguide and the spectral bandwidth is further extended by stimulated raman scattering. This stable ultrafast broadband radiation is shown to be enhanced due to the use of the waveguide.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 548-550 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Resonant tunneling by fast neutron irradiation with doses from 1×1012 to 1×1016 n/cm2 was studied. We observed that peak and valley positions shifted to higher voltages, and peak-to-valley ratios decreased with higher doses in static current-voltage characteristics. Several models which take into account ionized impurities were used to give consistent explanation to such phenomena.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of natural products 53 (1990), S. 603-608 
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 112 (1990), S. 5074-5080 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2803-2805 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The distribution of microtwins in GaAs epilayer grown on Si (001) substrates tilted towards the [1¯11] direction by molecular beam epitaxy has been studied by transmission electron microscopy. An asymmetric distribution of microtwins attributed to substrate misorientation and two-dimensional (2D) growth mode has been found. Orthogonal [1¯10] and [110] cross sections are identified by the angle of tilt in large-angle convergent beam electron diffraction Tanaka patterns [J. Electron. Microsc. 29, 408 (1980)] taken across the GaAs/Si interface. It is found that (11¯1) microtwins are preferentially grown in GaAs epilayers on a tilted Si (001) substrate where the growth mode is 2D, while symmetrical (1¯1¯1) and (111) twins are observed when there is a reversal of twin distribution and the growth mode is 3D.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 54 (1990), S. 131-140 
    ISSN: 1570-7458
    Keywords: Blattella germanica ; hatching ; ootheca ; insecticides ; hydramethylnon ; boric acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Des femelles adultes de B. germanica, maintenues à 20° ou 28° C et 90% HR, ont été exposées, 7 à 14 jours ou 14 à 21 jours après l'émergence à des appâts contenant de l'hydraméthylnone ou de l'acide borique. Empoisonnées par l'hydraméthylnone les femelles retiennent leur oothèque jusqu'à la mort, tandis que empoisonnées par l'acide borique, elles déposent leur oothèque prématurément. Toutes les oothèque des femelles empoisonnées ont été maintenues dans les mêmes conditions écologiques jusqu'à ce qu'elles éclosent ou se révèlent non viables. Avec l'acide borique, une réduction des naissances a été observée pour les oothèques des mères des 2 classes d'âges et aux 2 températures, ce qui n'a eu lieu qu'à la température basse avec l'hydraméthylnone. L'effet ne semble pas dû au transfert de l'insecticide de la femelle à l'oothèque et est plus probablement provoqué par la fin des échanges d'eau entre la mère et l'oothèque, à la mort ou lors de l'émission prématurée. Pour les femelles traitées à l'acide borique, la proportion d'éclosion d'oothèques est plus importante chez les femelles ayant retenu leur oothèque jusqu'à la mort que chez celles qui les ont émises prématurément. Les femelles empoisonnées lors d'opérations d'éradication peuvent mourir ou déposer leurs oothèques loin des zones traitées; les larves éclosant de ces oothèques peuvent maintenir la contamination.
    Notes: Abstract Adult female Blattella germanica (L.) (Dictyoptera: Blattellidae) carrying oothecae were confined in cages with bait formulations of boric acid or hydramethylnon at 90% r.h. and either 20° or 28° C until all had been killed. Females poisoned by hydramethylnon retained their oothecae at death, while a considerable proportion of those killed by boric acid deposited their oothecae prematurely. Oothecae from both groups of insects were monitored until they either hatched or lost viability. Oothecae from both 7–14 day old adults and 14–21 day old adults poisoned with hydramethylnon showed reduced hatching relative to controls at 20° but not at 28 °C, an effect attributed to premature loss of water-exchange between oothecae and female adult during the maturation process. Fewer oothecae hatched from females poisoned with boric acid at both temperatures, and the proportion of those which did hatch was higher in the group retained by the female at death than in the group prematurely deposited. These results for the boric acid-treated females and results which showed no significant difference between the hatch of oothecae from hydramethylnon-treated females and decapitated females suggested that transfer of insecticide from treated female to oothecae was not important in reducing hatch for either compound. Reinfestation as a consequence of the failure of conventional blatticides to prevent hatching of oothecae carried by female B. germanica is discussed.
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