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  • 1
    Electronic Resource
    Electronic Resource
    Chromosome numbers, genome sizes, cell volumes and evolution of snake-head fish (family Channidae) (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 33 (1988), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Chromosome number, C-value and cell volume studies were carried out on three species of the genus Channa, viz., C. punctatus, C. striatus and C. gachua. The chromosome number, karyotypic structure and DNA content per cell along with cell volume are reported and described. A series of chromosomal rearrangements are established in three different karyotypes along with polyploidy. Both pericentric inversion and Robertsonian fusion played a major role in chromosome rearrangements. The nuclear DNA content of these three species is within 19-29% of the present-day placental mammals, and is thus lower than the median amount for fishes in general and teleosts in particular. Their lower DNA content suggests that the three species of the family Channidae are highly specialized, and this is supported by their known morphologic, reproductive, behavioural and ecological characteristics.The evolutionary significance of these chromosomal rearrangements, their origin and their mode of establishment are discussed. A probable phylogenetic model based on karyotype, C-value and chromosomal rearrangements of the genus is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1988.tb05523.x
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  • 2
    Electronic Resource
    Electronic Resource
    Photoluminescence measurements on open-tube heat-treated and Cd-diffused InP (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1429-1430 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cadmium incorporation in nominally undoped n-InP using open-tube diffusion has been investigated by photoluminescence (PL) measurements. A Sn-InP solution has been used to provide P vapor overpressure during the diffusion. This results in a 2–3 times larger incorporation of Cd acceptors in InP as compared to a low P vapor overpressure condition. In addition, the overall degradation in the PL intensity is considerably reduced by this technique. The degradation in InP during diffusion is further investigated by PL measurements on heat-treated InP under the diffusion conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99963
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  • 3
    Electronic Resource
    Electronic Resource
    Homoepitaxial films grown on Si (100) at 150 °C by remote plasma-enhanced chemical vapor deposition (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1885-1887 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-temperature silicon epitaxy is critical for future generation ultralarge scale integrated circuits and silicon-based heterostructures. Remote plasma-enhanced chemical vapor deposition has been applied to achieve silicon homoepitaxy at temperatures as low as 150 °C, which is believed to be the lowest temperature reported to date. Critical to the process are an in situ remote plasma hydrogen cleaning of the substrate surface in an ultrahigh vacuum growth chamber prior to epitaxy, and substitution of thermal energy by remote plasma excitation via argon metastables and energetic electrons to dissociate silane and increase adatom mobility on the surface of the silicon substrate. Excellent crystallinity with very few defects such as dislocations and stacking faults is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102161
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  • 4
    Electronic Resource
    Electronic Resource
    Conduction mechanisms in sputtered Ta2O5 on Si with an interfacial SiO2 layer (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1140-1146 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of leakage in sputtered Ta2O5 films (10–30 nm) on Si substrates with an interfacial SiO2 layer has been studied for temperatures between –50 and +100 °C and for electric fields between 0 and 2 MV/cm. The activation energy of leakage and the current-voltage relationships have been used to identify various high field conduction mechanisms such as Poole–Frenkel transport at high temperatures and field emission at low temperatures. At low fields and intermediate temperatures, electronic hopping conduction leading to space-charge-limited flow at high current densities has been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343052
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  • 5
    Electronic Resource
    Electronic Resource
    Regular and chaotic bubble oscillations in periodically driven pressure fields (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 3342-3350 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The motion of a single bubble in a periodically driven pressure field is examined from a geometric point of view using Poincaré maps. It is shown that the equations of motion can be transformed to a perturbation of a Hamiltonian system. The conditions determining nonlinear resonance are found; these correspond to subharmonic bifurcations. Further it is illustrated how the resonant response interacts with the nonresonant one to produce jump bifurcations. Results are also presented indicating that the periodic response undergoes a complex bifurcation sequence and a strange attractor forms. Finally it is demonstrated how the strange attractor disappears creating horseshoe maps that are associated with transient chaos. This gives some indication of the bifurcations that form the superstructure for single bubble oscillations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866466
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  • 6
    Electronic Resource
    Electronic Resource
    Erratum: "The dynamics of periodically driven bubble clouds'' [Phys. Fluids 31, 3519 (1988)] (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 898-898 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857559
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  • 7
    Electronic Resource
    Electronic Resource
    Turbulence structure in free-surface channel flows (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 2491-2503 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A turbulence structure in horizontal liquid streams bounded by a free surface and a wall has been investigated using 10–25 μm oxygen bubbles as tracers. High speed video movies indicate that the dominant flow structure is caused by the periodic ejection of intensely turbulent fluid with low streamwise momentum from the wall region into the relatively quiescent bulk fluid which it displaces and mixes with slowly. The motion of these bursts is constrained by the free interface. Between bursts and the interface a high speed region with a steep velocity gradient develops as a consequence. This in turn causes progress of the burst fluid toward the interface to slow down and eventually to turn back toward the wall, giving rise to characteristic rolling structures, which rotate clockwise if the flow is viewed as going from left to right. To complement the video studies, quantitative data were obtained by analyzing bubble streak lines generated by photography of optically chopped flashes. These data show that in the vicinity of the interface the velocity fluctuations normal to it are damped whereas those parallel to it are enhanced. Analysis of conditional samples of the data indicate that fluid with relatively low streamwise momentum tends to move toward the interface while fluid with high momentum moves away giving rise to rotating structures that roll along with the flow in agreement with the video studies. A high degree of correlation between ejection events near the wall and the fluid motion near the interface also confirm that the bursts extend across the flow stream. This has important implications for surface renewal theories of turbulent transport at fluid–fluid interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866603
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  • 8
    Electronic Resource
    Electronic Resource
    The dynamics of periodically driven bubble clouds (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 3519-3531 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An averaged two-fluid model is used to study the motion of a cloud of bubbles. The linearized equations of motion are shown to be a wave equation with both dissipation and dispersion. The fully nonlinear equations are also examined and it is demonstrated that the cutoff frequency of the cloud is equal to the natural frequency of a single bubble. The steady linear response of a periodically driven bubble cloud is then derived. Resonances are seen to arise when the driving frequency is below the cutoff frequency. The inner core of the cloud is shielded by an outer layer when the driving is above the cutoff frequency. The nonlinear dynamics of periodically driven bubble clouds is studied numerically. It is found that the cutoff frequency is crucial in determining whether or not the cloud will behave like a single bubble. Also, under some conditions the cloud is seen to behave like a damped and driven single-degree-of-freedom Hamiltonian system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866919
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  • 9
    Electronic Resource
    Electronic Resource
    Two cases of pseudosarcomatous invasive transitional cell carcinoma of the urinary bladder mimicking malignant fibrous histiocytoma (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 15 (1989), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2559.1989.tb03045.x
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  • 10
    Electronic Resource
    Electronic Resource
    CRACK CLOSURE AND FATIGUE CRACK GROWTH RATE IN THREE POINT BEND SPECIMENS OF DIFFERENT WIDTHS (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 12 (1989), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract— The crack closure stress intensity factor values and fatigue crack growth rates were determined in Three Point Single Edge Bend, SE(B), specimens prepared from rails manufactured using two different grades of rail steels. The width, and correspondingly the span, of the SE(B) specimens were varied eight fold; the thickness of all the specimens being the same. It is observed that the crack closure stress intensity factor values decrease with an increase in the width of SE(B) specimens. At a given value of ΔKeff, the fatigue crack growth rate (FCGR) is independent of the width. However, at a given value of ΔKeff, the FCGR is observed to decrease with increasing width. In view of the above results, the scope of application of the FCGR laws based on an effective stress intensity factor to the life prediction of components, requires careful examination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1989.tb00507.x
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