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  • Articles  (36)
  • 1995-1999  (36)
  • 1995  (36)
  • Physics  (36)
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  • Articles  (36)
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  • 1995-1999  (36)
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  • 1
    Electronic Resource
    Electronic Resource
    High-Energy Particles in Solar Flares (1995)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 33 (1995), S. 239-282 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.33.090195.001323
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  • 2
    Electronic Resource
    Electronic Resource
    Femtosecond optical absorption measurements of electron-phonon scattering in GaAs quantum wells (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 3188-3190 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a combined experimental and theoretical investigation of intra- and intersubband carrier relaxation in GaAs/AlAs quantum wells following femtosecond laser excitation at low density. Time-resolved optical absorption has been measured using 125 fs pulses from a tunable Ti:sapphire laser which allows carriers to be excited preferentially into different subbands. The experiments have been analyzed using a multi-subband Monte Carlo simulation which contains all the important scattering mechanisms. Electron-phonon scattering rates obtained from dielectric continuum theory have been used, and we find excellent agreement with the experiment. The dominance of interface phonons in intrasubband relaxation is confirmed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113718
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic states in GaAs v-groove quantum wire structures with superlattice barriers (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2851-2853 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a joint theoretical and experimental investigation of GaAs v-groove quantum wires confined in GaAs/AlAs superlattice barriers. We have computed the electronic states for both the quantum wire and the barriers. The intrinsic bending of the superlattice layers, together with systematic spatial variations of their thickness, create localized states in the barriers that are separated from the wire. This effect has a strong impact on the overall luminescence efficiency of the wires. The results are in excellent agreement with photoluminescence and photoluminescence excitation spectra. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114806
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  • 4
    Electronic Resource
    Electronic Resource
    Hot carrier relaxation in GaAs V-groove quantum wires (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 3039-3041 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured hot carrier relaxation in GaAs V-groove quantum wires using time-resolved photoluminescence. Relaxation between confined one-dimensional subbands is clearly observed on the time scale of several hundred picoseconds. A simulation of the experiment using a hybrid multisubband Monte Carlo method which includes hot phonon and degeneracy effects gives good agreement with the measurements. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114270
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  • 5
    Electronic Resource
    Electronic Resource
    Usage and abusage (1995)
    [s.l.] : Nature Publishing Group
    Nature 377 (1995), S. 23-24 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] COCA-COLA has "something other than just the taste; the accumulated memory of all those ball games and good experiences as children which coke was a part of". This quotation from the Wall Street Journal epit-omizes the complexity of issues concerning the use of psychoactive substances. The original ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/377023a0
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  • 6
    Electronic Resource
    Electronic Resource
    Comptel analysis of GRB 940217 (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 153-156 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract COMPTEL on board CGRO has observed a very strong (S[〉 0.3 MeV] = 2.03 × 10−4 erg cm−2), complex, and long lasting (162 s) gamma-ray burst on February 17, 1994 (GRB 940217). Temporal fluctuations occur on timescales as short as 100 ms. Hard-to-soft spectral evolution has been observed during the burst emission and also within individual peaks. The photon spectra obtained within the 6 peaks can be modelled by single power law spectra and by broken power laws with break energies at around 1 MeV. The best-fit power law slopes vary between 1.1 and 3.5 throughout the event. The burst is located at [α 2000,δ 2000] = [29.5°, 3.8°] with a 3σ error radius of 0.9°. COMPTEL does not detect any significant “post-burst” emission (as reported by EGRET) at low energies (〈 30 MeV), and our upper limits are marginally consistent with the EGRET detections. Using high energy spectral and temporal information, distance limits to GRB 940217 have been derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658606
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of COMPTEL gamma-ray burst locations and spectra (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 231-234 
    Details
    ISSN: 1572-946X
    Keywords: gamma-ray bursts: observations ; locations ; spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In its first three years of operation, the COMPTEL instrument on theCompton Gamma-Ray Observatory has measured the locations (mean accuracy ∼1°) and spectra (0.75-30 MeV) of 18 gamma-ray bursts and continues to observe new events at a rate of ∼1/month. With good angular resolution and sensitivity at MeV energies, the growing COMPTEL burst catalog is an important new piece of evidence in the on-going GRB mystery. The COMPTEL burst locations are consistent with an isotropic distribution of sources, yet the spatial coincidence of two of the bursts indicates the possibility of repetition. The COMPTEL burst spectra are in most cases consistent with a single power law model with spectral index in the range 2–3. However, two bursts show evidence of a spectral break in the MeV range. Measurement of rapid variability at MeV energies in the stronger bursts provides evidence that either the sources are nearby (within the Galaxy) or the gamma-ray emission is relativistically beamed. We present an overview of analysis results obtained from the COMPTEL burst catalog concentrating on the search for burst repetition and the implications of highly variable MeV emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658622
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  • 8
    Electronic Resource
    Electronic Resource
    A compact representation of gamma-ray burst time series (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 119-122 
    Details
    ISSN: 1572-946X
    Keywords: Gamma-ray burst ; Time series ; Edge detection ; Noise reduction ; Variability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Multiscale edge detection (MSED), using wavelet transform extrema, provides a robust method to compress the information in a transient signal. We apply this to gamma-ray burst (GRB) time series. Multiscale edge detection can be used to quantify the variability, identify structures (e.g. FREDs), and suppress noise. We present preliminary results of MSED applied to BATSE 64ms discsc data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658599
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  • 9
    Electronic Resource
    Electronic Resource
    Exciton dynamics in ZnSe/ZnS x Se1−x superlattices (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1429-1433 
    Details
    ISSN: 0392-6737
    Keywords: Excitons and related phenomena (including electron-hole drops) ; Localised single-particle electronic states (excluding impurities) ; Photoluminescence ; II–VI semiconductors ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Time-resolved photoluminescence experiments in a wide carrier density range up to and beyond the threshold for stimulated emission in ZnSe/ZnS x Se1−x superlattices are presented. Different localisation mechanisms of free excitons are identified giving rise to different radiative recombination channels. At high carrier density localised energy states merge into miniband that allows for exciton-exciton interaction, such as screening of the free-exciton absorption and inelastic exciton-exciton scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457222
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  • 10
    Electronic Resource
    Electronic Resource
    Searching for multifractal scaling in gamma ray burst time series (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 111-114 
    Details
    ISSN: 1572-946X
    Keywords: multifractal ; variability ; GRB time series
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a multifractal analysis of GRB time series used to quantify the variability of the light curve. We discuss the advantages and disadvantages of multifractal analysis, including sensitivity to noise, and burst intensity, and present results for a few sample bursts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658597
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