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  • 1985-1989  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Stimulated emission from a Hg1−xCdxTe epilayer grown by molecular beam epitaxy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1285-1286 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the observation of stimulated emission from a (100) oriented Hg1−xCdxTe epilayer grown by molecular beam epitaxy. The cleaved epilayers were cooled and optically pumped by a Nd:YAG laser and were found to lase continuously up to 40 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101633
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular beam epitaxial growth and characterization of 2-in.-diam Hg1−xCdxTe films on GaAs (100) substrates (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 978-980 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hg1−xCdxTe films with 2 in. diameters have been grown by molecular beam epitaxy on GaAs (100) substrates. These films were grown in both the (100) and (∼(111)) B crystallographic orientations and in both conduction types. They were characterized by in situ electron diffraction, infrared absorption, and van der Pauw dc Hall measurements. Their surfaces were shiny and mirrorlike from center to edge. The Cd concentrations (x) of these films were very uniform, exhibiting standard deviations (Δx) as low as 0.7% of the mean (x¯). Their thicknesses also were uniform within 0.6%. These films were completely uniform in their conduction types; that is, the n-type films were entirely n type, and likewise for the p-type films. The Hall mobilities of these films show them to be of high quality, with values as high as 6.7×102 cm2 V−1 s−1 for the p-type (x=0.22) and 1.8×105 cm2 V−1 s−1 for the n-type films (x=0.21). These results represent an important achievement toward the future of infrared detector technology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99247
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  • 3
    Electronic Resource
    Electronic Resource
    Relation between crystallographic orientation and the condensation coefficients of Hg, Cd, and Te during molecular-beam-epitaxial growth of Hg1−xCdxTe and CdTe (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 1359-1363 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate here the influence of the crystallographic orientation of the CdTe substrate on the condensation coefficients of Hg, Cd, and Te during the growth of Hg1−xCdxTe and CdTe by molecular-beam epitaxy. We show that the Hg condensation coefficient is strongly influenced by the orientation. A CdTe (1¯1¯1¯)B face requires about one order of magnitude less mercury than a (111)A face when growth occurs at 185 °C. Whereas for a CdTe(100) face, the Hg condensation coefficient falls in between. Even though the effect is less dramatic for the condensation coefficient of cadmium, a similar tendency is observed. These results can be explained in terms of the bonding of the surface atoms and confirm once again that the surface plays an important role in the molecular-beam-epitaxial growth process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337310
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  • 4
    Electronic Resource
    Electronic Resource
    Transmission electron microscopy of (001) ZnTe on (001) GaAs grown by molecular-beam epitaxy (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 1783-1785 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural properties of [001] ZnTe epitaxial layers grown on [001] GaAs substrates were investigated by transmission electron microscopy. The layers were deposited by molecular-beam epitaxy with thicknesses ranging from 50 to 1800 nm. The layers can be divided into three distinct regions of dislocation arrangements above the interface. The interface consists of an array of misfit dislocations. The separation of these dislocations is about 54 A(ring) and is independent of layer thickness. The first region extends 300 nm towards the surface and consists of a tangle of dislocations. The density of these dislocations increases with layer thickness. The second region, between 600 and 1300 nm above the interface, was found to contain a low density of dislocations. Above 1300 nm, the third region, the dislocation density surprisingly increases again and in addition Te precipitates are detected near the top surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339920
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  • 5
    Electronic Resource
    Electronic Resource
    Structural properties of Hg1−xZnxTe-CdTe strained layer superlattices and the reduction of threading dislocations from a CdTe buffer layer (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 2980-2983 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hg1−xZnxTe-CdTe strained layer superlattices were grown by molecular-beam epitaxy. Their structural properties and interplay with a CdTe buffer layer were investigated with transmission electron microscopy. There is an order of magnitude reduction in the density of threading dislocations in the superlattice compared with the CdTe buffer layer. The reduction is accomplished by using the lattice-mismatch-induced strain to bend threading dislocations over into the superlattice-buffer layer interface. The magnitude of the reduction agrees well with predicted values for this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344180
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  • 6
    Electronic Resource
    Electronic Resource
    Dissipative hydrodynamic oscillators (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 727-737 
    Details
    ISSN: 0392-6737
    Keywords: Hydrodynamic stability ; Convection and heat transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presentano qui le previsioni che riguardano l'insorgenza di onde gravitazionali elettrocapillari trasversali nell'interfaccia di due fluidi quando un campo elettrico tangenziale o ortogonale viene imposto all'interfaccia. Particolari applicazioni includono interfacce ariaolio e aria-mercurio.
    Abstract: Резюме В работе делаются предсказания, касающиеся возникновения поперечных гравитационно-электро-капиллярных волн на границе раздела двух жидкостей, когда на границу раздела накладывается либо тангенциальное, либо ортогональное электрическое поле. Рассматриваются некоторые применения к границам раздела воздух-нефть и воздухртуть.
    Notes: Summary Provided here are predictions concerning the onset of transverse gravity-electro-capillary waves at the interface of two fluids when either a tangential or an orthogonal electric field is imposed to the interface. Particular applications include air-oil and air-mercury interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451559
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  • 7
    Electronic Resource
    Electronic Resource
    Dissipative hydrodynamic oscillators (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 1615-1629 
    Details
    ISSN: 0392-6737
    Keywords: Hydrodynamic stability ; Convection and heat transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto I confini tendono generalmente a stabilizzare uno strato liquido altrimenti instabile soggetto a vincoli termici. Si forniscono qui risultati riguardo il ruolo della dimensione orizzontale finita e della profondità di strato finita per uno strato di liquido soggetto a gradienti di concentrazione dell'agente attivo di superficie quando l'instabilità (sovrastabilità) tende a crescere nelle forme di onde longitudinali o trasverse indotte dall'effetto di Marangoni.
    Abstract: Резюме Границы обычно стабилизируют неустойчивые слои жидкости, на которые наложены термические воздействия. В этой работе анализируется роль конечных горизонтальнхы размеров и конечных размеров по глубине для слоя жидкости при наличии градиентов концентрации поверхностно-активного вещества, когда неустойчивость возникает в форме поперечных или продольных волн, обусловленных эффектом Марангони.
    Notes: Summary Boundaries generally tend to stabilize an otherwise unstable liquid layer subjected to thermal constraints. Here, results are provided about the role of the finite horizontal size and of the finite layer for a liquid layer subjected to gradients of surfactant concentration when instability (overstability) tries to set up in the form of transverse or longitudinal waves induced by the Marangoni effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451016
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  • 8
    Electronic Resource
    Electronic Resource
    Dissipative hydrodynamic oscillators (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 1631-1643 
    Details
    ISSN: 0392-6737
    Keywords: Hydrodynamic stability ; Convection and heat transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Qui sono studiate sia numericamente che analiticamente oscillazioni trasverse di un interfaccia aria-liquido deformabile che non seguono la legge di Laplace-Kelvin. Inoltre si ricerca anche per uno strato di liquido di profondità finita la competizione di questo modo di oscillazione crescente e l'insorgenza della convenzione standard cellulare costante di Bérnard-Marangoni. Si forniscono valori di soglia e notevoli varietà di numeri capillari e di Schmidt (Prandtl) per l'osservazione sperimentale di tale instabilità.
    Abstract: Резюме Численно и аналитически исследуются осцилляции деформируемой границы раздела воздух-жидкость, которые не подчиняются закону Лапласа-Кельвина. Для слоя жидкости конечной глубины мы также исследуем конкуренцию этой моды колебательной неустойчивости и появление стандартной стационарной ячеистой конвенции Бенара-Марангони. Мы определяем пороговые значения и соответствующие области для числа Шмидта (Прандтля) и для капиллярного числа для экспериментального наблюдения этой неустоичнвости.
    Notes: Summary Transverse oscillations of a deformable air-liquid interface not obeying the Laplace-Kelvin law are here studied, both numerically and analytically. Moreover, for a liquid layer of finite depth we also explore the competition of this mode of overstability and the onset of standard steady cellular Bénard-Marangoni convection. We provide threshold values and relevant Schmidt (Prandtl) and capillary number ranges for the experimental observation of this instability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451017
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  • 9
    Electronic Resource
    Electronic Resource
    Dissipative hydrodynamic oscillators (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 709-716 
    Details
    ISSN: 0392-6737
    Keywords: Hydrodynamic stability ; Convection and heat transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si descrive il moto oscillatorio di un interfaccia tra liquido e liquido indotto dall'effetto di Marangoni, cioè la variazione della tensione di superficie con la concentrazione di un tensioattivo nell'interfaccia. Poi si danno, quanto lo smorzamento si attenua, valori di soglia e regioni di parametri per onde longitudinali sostenute (Marangoni-Lucassen) in termini dei coefficienti di trasporto dei due liquidi.
    Abstract: Резюме Осцилляторное движение границы раздела двух жидкостей, индуцированное эффектом Марангони, т.е. изменением поверхностного натяжения с концентрацией поверхностно-активного вещества, описывается, как гармоническое колебание концентрации поверхностно-активного вещества на границе раздела. Затем при исчезающе малом затухании в терминах транспортных коэффициентов двух жидкостей определяются пороговые значения и область параметров для незатухающих продольных волн (Марангони-Лукасена).
    Notes: Summary The oscillatory motion of a liquid-liquid interface induced by the Marangoni effect,i.e. the variation of surface tension with the concentration of a surfactant, is described as the harmonic oscillation of the surfactant concentration at the interface. Then, at vanishing damping, threshold values and parameter regions for sustainedlongitudinal (Marangoni-Lucassen) waves are given in terms of the transport coefficients of the two liquids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02451557
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  • 10
    Electronic Resource
    Electronic Resource
    Shell configuration of Y-Ba-Cu-O single-crystal superconductor (1988)
    Springer
    Journal of materials science 7 (1988), S. 501-502 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01730705
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