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  • Institute of Physics  (78)
  • Springer Nature  (7)
  • American Institute of Physics (AIP)  (5)
  • Blackwell Publishing Ltd  (4)
  • 1
    Electronic Resource
    Electronic Resource
    A model for the current instabilities in GaAs-AlGaAs heterojunction (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1955-1960 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model is proposed for the description of the current instabilities in GaAs-AlGaAs heterojunctions. It consists of three parts: the injection of electrons via the contact into the AlGaAs layer, the partial capture of these electrons in deep centers, and the change with time of the band structure. This last ingredient is crucial, since due to the increase of the total number of electrons in the AlGaAs layer the band bending decreases making real-space transfer from the AlGaAs layer to the two-dimensional electron gas possible. We have performed quasistationary simulations of the time dependence of the current. The velocities, average energies, capture rates, etc. were taken from Monte Carlo simulations. It turned out, that the parameters for the modeling of the contact, which are to a high degree unknown, play an essential role. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361045
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrafast carrier dynamics at a metal-semiconductor interface (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6831-6838 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ultrafast carrier dynamics in the high electric field at an Au-GaAs interface has been studied experimentally as well as theoretically. The photoluminescence decay time is related directly to the carrier sweepout from the GaAs depletion region, i.e., to the time needed for photoexcited electrons and holes to leave this region. This decay time has been found to increase drastically with laser input power, ranging from a few picoseconds at low excitation to values of 10–20 ps at high excitation. These results indicate a significant retardation of the sweepout, which cannot be explained by intervalley scattering and space-charge effects. From our Monte Carlo calculations it has been found that the applied electric field collapses totally almost instantaneously after laser excitation due to the enormous excess of photoexcited charges. The sweepout only recovers after some time needed to recharge the device. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363749
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  • 3
    Electronic Resource
    Electronic Resource
    Carrier-carrier scattering induced capture in quantum well lasers (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1490-1492 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present calculations of the carrier capture efficiency into various types of quantum well lasers. The carrier capture into a quantum well can be due to either optical phonon emission or carrier-carrier scattering. Both capture mechanisms have been calculated and show oscillations as a function of the quantum well thickness. By optimizing the carrier capture efficiency the carrier accumulation in the barrier layers can be reduced, resulting in an improved modulation response and threshold current.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108668
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  • 4
    Electronic Resource
    Electronic Resource
    AUTOMATION OF DATA FLOW (1969)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 161 (1969), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1969.tb34104.x
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  • 5
    Electronic Resource
    Electronic Resource
    QUANTITATIVE INTERACTIONS OF INCREASED Po2 AND Pco2 UPON RESPIRATION IN MAN (1963)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 109 (1963), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1963.tb13502.x
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of wall compliance on the Goertler vortex instability (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2000-2002 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability of the flow of a viscous incompressible fluid over a curved compliant wall to longitudinal Goertler vortices is investigated. The compliant wall is modeled by a particularly simple equation relating the induced wall displacement to the pressure in the overlying fluid. Attention is restricted to the large Goertler number regime; this regime being appropriate to the most unstable Goertler mode. The effect of wall compliance on this most unstable mode is investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857932
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  • 7
    Electronic Resource
    Electronic Resource
    Eigenvalues associated with relaxed states of toroidal plasmas (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 3186-3195 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the theory of relaxed states of toroidal plasmas certain eigenvalues of the equation ∇×B=μB play a crucial role. These eigenvalues are associated with vanishing toroidal flux and determine the onset of current limitation in a toroidal discharge. In axisymmetric systems there are both periodic and axisymmetric eigenfunctions and it is important to know whether the eigenmode associated with the lowest eigenvalue is periodic or axisymmetric. This depends on the shape of the poloidal cross section and determines the nature of the current-limited discharge. The eigenvalues of periodic and axisymmetric modes have been computed in rectangular and elliptical cross sections and in reentrant Multipinch-like cross sections. The reentrant case required new numerical techniques, which are described. It is found that in rectangular and elliptic cross sections the lowest mode is always periodic. However, in the Multipinch a transition occurs in which the lowest eigenmode changes from periodic to axisymmetric as the "waist'' in the cross section is made narrower. The critical width is determined. These calculations suggest that in the GA Multipinch experiment [Nucl. Fusion 26, 255 (1986)] the current saturated discharge should be axisymmetric—unlike all other existing pinch experiments where it is periodic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866494
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  • 8
    Electronic Resource
    Electronic Resource
    Countermeasures to Control Oil Spills in Western Canada (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 14 (1976), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Increasing concern over ground-water pollution from hydrocarbons is being expressed by governments and industries in western Canada. The Manitoba government has recently held public hearings on the subject and is now working with the petroleum industry to develop new legislation concerning the handling of refined petroleum products. The petroleum industry has developed a series of “oil spill manuals” which describe procedures for controlling leaks and spills of petroleum products. Emphasis is now being placed on education and prevention, and hydro-geologists are involved in developing training manuals and films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1976.tb03097.x
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  • 9
    Electronic Resource
    Electronic Resource
    Comparison of Four Media for the Enumeration of Fungi in Dairy Products — A Collaborative Study (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 47 (1982), 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: Four fungal enumeration media, including potato dextrose agar (PDA) with antibiotics (APDA), acidified PDA (PDA-A), Cooke rose bengal agar (CRBA), and APDA containing the mold colony spreading inhibitor dichloran (APDA-D-5), were compared by seven laboratories for recovery of yeasts and molds from inoculated and naturally contaminated dairy products. Although some variability was observed in counts obtained for individual products between laboratories, no significant overall differences were observed among the four media. Mold colony diameters but not numbers were reduced with APDA-D-5 and CRBA, thus aiding in the counting of plates heavily contaminated with molds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1982.tb12748.x
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  • 10
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    Detection of nanoscale electron spin resonance spectra demonstrated using nitrogen-vacancy centre probes in diamond (2016)
    Springer Nature
    Details
    Publication Date: 2016-01-07
    Description: Article The application of resonant electron spin ensembles to the study electronic systems can be limited in spatial resolution above the micrometre scale. Here, the authors use nitrogen vacancies to probe the paramagnetic background in diamond via spin resonance spectra dominated by single local spins. Nature Communications doi: 10.1038/ncomms10211 Authors: L. T. Hall, P. Kehayias, D. A. Simpson, A. Jarmola, A. Stacey, D. Budker, L. C. L. Hollenberg
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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