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  • 2015-2019  (297)
  • 2000-2004  (68)
  • 1975-1979  (12)
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  • 1
    Electronic Resource
    Electronic Resource
    Possibility of multiple tunnelling current peaks in a coupled quantum well system (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 943-947 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this work, we have numerically integrated in space and time the effective-mass nonlinear Schrödinger equation for an electron wave packet in a bilayer electron system. Considering both Hartree and exchange-correlation potentials, we have calculated the tunnelling rates between the two quantum wells when an external bias is applied in the double quantum well system. Due to the nonlinear effective-mass equation, it is found that the charge dynamically trapped in both wells produces a reaction field which modifies the system resonant condition. At different electronic sheet densities, we have shown the possibility of having multiple resonant tunnelling peaks in a bilayer electron system. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373760
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  • 2
    Electronic Resource
    Electronic Resource
    Low-threshold and high power λ∼9.0 μm quantum cascade lasers operating at room temperature (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 1741-1743 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a low threshold current density and high power for λ∼9 μmAlInAs/GaInAs quantum cascade lasers operating at room temperature. The threshold current density is 1.95 kA/cm2 at 300 K and 0.61 kA/cm2 at 80 K for 5 μs pulses at 200 Hz repetition rate. The peak output power is 700 mW at room temperature and 1.3 W at 80 K per two facets for cavity length is 3 mm with a stripe width of 20 μm. The characteristic temperature T0 is 185 °C. The slope efficiency is 450 and 800 mW/A at 300 and 80 K, respectively. In continuous wave operation, the output power is more than 150 mW at 80 K and 25 mW at 140 K. This high performance was achieved by improving the material growth and processing technology. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1310632
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  • 3
    Electronic Resource
    Electronic Resource
    High-performance quantum cascade lasers (λ∼11 μm) operating at high temperature (T ≥425 K) (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 416-418 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report record-low threshold current density and high output power for λ∼11 μm Al0.48In0.52As/Ga0.47In0.53As quantum cascade lasers operating up to 425 K. The threshold current density is 1.1, 3.83, and 7.08 kA/cm2 at 80, 300, and 425 K, respectively, for 5 μs pulses at a 200 Hz repetition rate. The cavity length is 3 mm with a stripe width of 20 μm. The maximum peak output power per facet is 1 W at 80 K, 0.5 W at 300 K, and more than 75 mW at 425 K. The characteristic temperature of these lasers is 174 K between 80 and 300 K and 218 K in the range of 300–425 K. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1343848
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  • 4
    Electronic Resource
    Electronic Resource
    Ethnopharmacology of Sacred Psychoactive Plants Used by the Indians of Mexico (1977)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Pharmacology 17 (1977), S. 647-675 
    Details
    ISSN: 0362-1642
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pa.17.040177.003243
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  • 5
    Electronic Resource
    Electronic Resource
    Development of the lateral line system in the sea bass (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 62 (2003), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Using light and electron microscopy, a study of the development of the lateral line system of the sea bass Dicentrarchus labrax, from embryo to adult, revealed that the first free neuromasts appeared on the head shortly before hatching and multiplied during the larval stage. They were aligned on the head and trunk in a pattern which corresponded to the location of future canals. The transition to the juvenile stage marked the start of important anatomical changes during which head and trunk canals were formed successively. Neuromasts, with a cupula and consisting of standard sensory cells and supporting cells, were characterized by bidirectional polarity. The exact location of the first neuromast formed in the embryo was identified and its differentiation monitored from primordium to eruption. This neuromast was distinguishable from the others by its radial polarity. Correlations were made between the development of the lateral line system and the behaviour of the sea bass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1095-8649.2003.00004.x
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of Soy Glycinin Addition on the Conformation and Gel Strength of Two Pork Myosin Types (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 68 (2003), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The pale, soft, and exudative (PSE) condition in pork meat has been associated with protein dena-turation that leads to loss of functional properties. The effect of soy glycinin addition to model systems of actomyosin from PSE or normal meat on biophysical properties was evaluated. Although the functional properties depended on actomyosin concentration, a 75% actomyosin/25% glycinin mixture presented acceptable properties with both types of actomyosin. This combination was used to investigate protein-protein interactions. Gel strength correlated with intermediate a-helical content and protein aggregation. Changes in protein secondary structure probably added to protein denaturation appear to be necessary to improve gelation and water retention in PSE actomyosin-glycinin combinations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2003.tb05795.x
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  • 7
    Electronic Resource
    Electronic Resource
    A generalized stefan condition (1979)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 30 (1979), S. 749-755 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zussamenfassung In dieser Arbeit wenden wir die Theorie der Oberflächen-Thermodynamik auf die Bestimmung der Sprungbedingung für den Wärmefluss an einer Schmelzfläche an. Wir trennen die Oberflächenspannungs-Effekte von den Oberflächenenergie-Effekten und beschreiben Beziehungen zwischen den beiden, die eine Vergrösserung oder Verkleinerung der Oberflächenkrümmung bedingen können.
    Notes: Summary In this paper we apply the theory of surface thermodynamics to find the jump condition on heat flux across a melting-surface. We distinguish between the effects of surface tension and of surface energy and describe relations between the two which may ensure enhancement or diminution of the curvature of the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01590684
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  • 8
    Electronic Resource
    Electronic Resource
    Copper and CuNi Alloys Substrates for HTS Coated Conductor Applications Protected from Oxidation (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 426-432 (Aug. 2003), p. 3511-3516 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/07/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.426-432.3511.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    A search at two eclipses for short-period waves that heat the corona (2000)
    Springer
    Solar physics 195 (2000), S. 281-298 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract As part of a study of the cause of solar coronal heating, we searched for high-frequency (∼1 Hz) intensity oscillations in coronal loops in the [Fe xiv] coronal green line. We summarize results from observations made at the 3 November 1994, total solar eclipse from the International Astronomical Union site in Putre, Chile, through partly cloudy skies, and at the 26 February 1998 total solar eclipse from Nord, Aruba, through clear skies. We discuss the image reduction and analysis of two simultaneous series of coronal CCD images digitized at 10 Hz for a total time of 160 s in Chile. One series of images was taken through a filter isolating the 5303 Å[Fe xiv] coronal green line and the other through a 100 Å filter in the nearby K-corona continuum. We then discuss the modifications made for the 1998 eclipse, and the image reduction and analysis for those image sequences. After standard calibrations and image alignment of both data sets, we use Fourier analysis to search in the [Fe xiv] channel for intensity oscillations in loops at the base of the corona. Such oscillations in the 1-Hz range are predicted as a result of density fluctuations from the resonant absorption of MHD waves. The dissipation of a significant amount of mechanical energy from the photosphere into the corona through this mechanism could provide sufficient energy to heat the corona. At neither eclipse do we find evidence for oscillations in the [Fe xiv] green line at a level greater than 2% of coronal intensity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005226119434
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  • 10
    Electronic Resource
    Electronic Resource
    Amorphous to polycrystalline transition in Co $\mathsf{_x}$ Si $\mathsf{_{1-x}}$ alloy thin films (2004)
    Springer
    The European physical journal 41 (2004), S. 517-524 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The transition from amorphous to polycrystalline microstructure has been studied in sputtered Co x Si1-x alloy films by structural, magneto-optical and Nuclear Magnetic Resonance measurements. For $x \geq 0.76$ , Si is diluted into Co without significantly altering the polycrystalline microstructure, composed of a mixture of hcp and fcc grains. However, the fraction of Co atoms that contribute to the Nuclear Magnetic Resonance signal is found to decrease steeply (down to about 60 $\%$ at x = 0.76) suggesting a microscopic segregation of a Si rich phase that induces a large degree of disorder. This is reflected in a harder magnetic behavior and a strong anisotropy dispersion. Below x = 0.75, the transition to an amorphous microstructure results in a sudden increase in the fraction of Co atoms within a ferromagnetic phase, indicating the recovery of the microscopic homogeneity. Also a significant enhancement of the macroscopic magnetic anisotropy is found for amorphous films with compositions right below the transition. Within the amorphous phase a second regime of Si segregation appears characterized by a constant Co local environment and constant magnetic properties. Finally, for x = 0.65 there is a significant Si enrichment in the Co environment and the films become non magnetic for compositions below this point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00345-0
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