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  • Articles  (131)
  • 1990-1994  (131)
  • Physics  (101)
  • Geosciences  (53)
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  • Articles  (131)
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  • 1
    Electronic Resource
    Electronic Resource
    CdS/CdSe intrinsic Stark superlattices (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 907-915 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Strained layer superlattices of wurtzite CdS/CdSe have been grown on (111)A GaAs substrates by metalorganic chemical vapor deposition and their optical properties studied by photoluminescence spectroscopy. It is shown that the superlattice layers contain giant strain-induced piezoelectric fields exceeding 2×108 V m−1. These fields are similar to those reported for (111) orientated III–V superlattices, but an order of magnitude greater. The recombination energies from a series of samples provide evidence for a type II conduction band offset of 0.23±0.10 eV (the electron wells being in the CdS), with the band structure heavily modified by the internal electric fields. In addition, the photoluminescence peak emission energy shows a strong dependence on the excitation power. This is interpreted as further evidence for the effect of internal fields. We conclude that this system shows new effects not previously observed in II–VI compound superlattices. The large band-gap tunability and the space-charge effects offer possibilities for all-optical switching devices in the 700–1300-nm region of the spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351312
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  • 2
    Electronic Resource
    Electronic Resource
    Control of nitrogen incorporation in ZnTe:N grown by molecular-beam epitaxy using Ar dilution in a N plasma source (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5214-5217 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The use of Ar dilution in a N plasma source has been used to achieve control of both electrical and optical properties of p-type ZnTe:N grown by molecular-beam epitaxy. Photoluminescence data are presented that show the transition from "pure'' ZnTe emission to that indicative of heavily N-doped ZnTe. A new principal bound-exciton line associated with N impurities is observed at 2.3685 eV. An anomalous red shift in the corresponding donor-acceptor pair peak energy with increasing N concentration is observed at high N concentration and is attributed to the effects of N impurity banding. Trends in p-type conductivity confirmed the ability to control hole concentrations using Ar dilution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357190
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  • 3
    Electronic Resource
    Electronic Resource
    Photoluminescence and p-type conductivity in CdTe:N grown by molecular beam epitaxy (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5423-5428 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An rf nitrogen (N) plasma source has been used to achieve p-type conductivity in molecular beam epitaxy CdTe layers grown with a Cd overpressure. Photoluminescence and secondary ion mass spectrometry measurements have confirmed the incorporation of the N species, and evidence for the resulting p-type conductivity has been obtained using capacitance-voltage and current-voltage techniques. Net hole concentrations as high as 2×1017 cm−3 have so far been achieved, which contrasts with the normally n-type nature of our undoped CdTe layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357197
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic properties of stage-1 CoCl2-graphite intercalation compounds under pressure (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5746-5748 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report ac magnetic susceptibility (χ=χ'−iχ‘) measurements of stage-1 CoCl2-graphite intercalation compounds (GICs) carried out under hydrostatic pressures of 0–15 kbar. For stage-1 CoCl2 -GICs, it is found that the three-dimensional ordering temperature Tc2=TN=9.7 K, where the ferromagnetic planes of Co2+ spins become ordered into an antiferromagnetic arrangement along the c axis, shifts to a higher temperature with increasing pressure. Additionally, the transition field Ht, measured when a magnetic field is applied in the x-y plane, shifts to a higher field value with increasing pressure. From the increase of the transition field, we can estimate the pressure dependence of the antiferromagnetic interlayer coupling J'.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345950
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  • 5
    Electronic Resource
    Electronic Resource
    A comprehensive meteorological modeling system—RAMS (1992)
    Springer
    Meteorology and atmospheric physics 49 (1992), S. 69-91 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary This paper presents a range of applications of the Regional Atmospheric Modeling System (RAMS), a comprehensive mesoscale meterological modeling system. Applications discussed in this paper include large eddy simulations (LES) and simulations of thunderstorms, cumulus fields, mesoscale convective systems, mid-latitude cirrus clouds, winter storms, mechanically- and thermally-forced mesoscale systems, and mesoscale atmospheric disperision. A summary of current RAMS options is also presented. Improvements to RAMS currently underway include refinements to the cloud radiation, cloud microphysics, cumulus, and surface soil/vegetative parameterization schemes, the parallelization of the code, development of a more versatile visualization capability, and research into meso-α-scale cumulus parameterization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01025401
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  • 6
    Electronic Resource
    Electronic Resource
    Sedimentary chrysophycean cyst assemblages as paleoindicators in acid sensitive lakes (1991)
    Springer
    Journal of paleolimnology 5 (1991), S. 19-72 
    Details
    ISSN: 1573-0417
    Keywords: paleolimnology ; lakes ; resting cysts ; algae ; Chrysophyceae taxonomy ; stratigraphy ; acidification ; ecology ; stomatocyst ; statospore
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Relationships between surface sediment cyst assemblages and lakewater characteristics were studies in 50 lakes located in central Ontario. The main purposes of the study were to identify the environmental factors most strongly controlling the distribution of chrysophycean cysts and to develop indices and equations to infer lake water pH from cyst assemblages. Principal components analysis indicates that alkalinity and associated TDS as well as elements related to trophic status are the factors most strongly correlated with the distribution of chrysophycean cysts. There are significant differences in the relative importance of these factors among the lakes. The transfer functions developed provide good prediction of pH values. This report also provides a descriptive analysis of the ‘fossil’ chrysophycean cyst flora of Ontario lakes. The descriptions include representative SEM micrographs and detailed characterization of each morphotype in consideration of the morphological variation observed among specimens of the same morphotype. Special attention has been paid to the anatomy of the collar complex and to the nature of the cyst surface ornamentation. One hundred and thirty seven morphotypes are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226557
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  • 7
    Electronic Resource
    Electronic Resource
    Ocean circulation beneath the Ronne ice shelf (1991)
    [s.l.] : Nature Publishing Group
    Nature 354 (1991), S. 221-223 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In January 1991, we used a pressurized hot-water drill to penetrate ice 562 m thick, 300 km from the northern limit of the Ronne ice shelf (Fig. 1). The drill was powered by three heat exchangers, providing a total heating power of 240 kW. A borehole pump, installed in an auxiliary ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/354221a0
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  • 8
    Electronic Resource
    Electronic Resource
    Allele-specific replication timing of imprinted gene regions (1993)
    [s.l.] : Nature Publishing Group
    Nature 364 (1993), S. 459-463 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Replication- timing can be conveniently measured by in situ hybridization to interphase nuclei9; nuclei in which the gene has not yet replicated show two single hybridization dots, whereas those in which the gene has replicated reveal two sets of doublets. Thus in an unsynchronized cell-cycle ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/364459a0
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  • 9
    Electronic Resource
    Electronic Resource
    Beating fraud (1993)
    [s.l.] : Nature Publishing Group
    Nature 363 (1993), S. 202-202 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - Much has been written about scientific misconduct allegations and the need for science to police itself better. However, it seems to me that scientists and journalists need a fundamental change of attitude towards misconduct to address this issue properly. To start with, we should refrain ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/363202d0
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  • 10
    Electronic Resource
    Electronic Resource
    A gene for the mouse pink-eyed dilution locus and for human type II oculocutaneous albinism (1993)
    [s.l.] : Nature Publishing Group
    Nature 361 (1993), S. 72-76 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To extend previous recombinant-inbred strain analyses demonstrating linkage of D15S12h (formerly designated DJNicl] to the mouse p locus3'4, we performed an interspecific backcross analysis. No recombinants were detected between p and D15S12h in 182 segregants from the cross ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/361072a0
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