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  • 2020-2023  (1)
  • 2010-2014  (356)
  • 1995-1999  (89)
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  • 1
    Electronic Resource
    Electronic Resource
    Persistent photoconductivity and electron density dependent magnetotransport measurements in narrow InGaAs/InP quantum wells (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1603-1605 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have observed a significant persistent photoconductivity effect in narrow InGaAs/InP quantum wells grown by metalorganic vapor phase epitaxy. This effect enables a detailed study of transport parameters as a function of the electron density. In this way, the interface roughness scattering can be separated from the strongly density dependent Coulomb scattering. For different preparation conditions, we find a strong correlation between the amount of interface roughness scattering and structural data of the interface. The ratio of quantum to classical scattering times remains (very-much-less-than)1 even in the case when Coulomb scattering is not the predominant scattering mechanism. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114953
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  • 2
    Electronic Resource
    Electronic Resource
    Growth of high quality Al0.48In0.52As/Ga0.47In 0.53As heterostructures using strain relaxed AlxGayIn1−x−yAs buffer layers on GaAs (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 412-414 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Morphological and physical properties of Al0.48In0.52As/Ga 0.47In0.53As heterostructures grown by molecular beam epitaxy, lattice relaxed on GaAs substrates and lattice matched on InP substrates, are presented. Both a quaternary linear and step graded lattice relaxed buffer concept is implemented to accomodate the lattice mismatch between the GaAs substrate and the Al0.48In0.52As/Ga 0.47In0.53As layer sequence. The surface morphology and the transport properties of Al0.48In0.52As/Ga0.47In0.53As high electron mobility transistor structures were studied by atomic force microscopy and Hall effect measurements, respectively. Optical properties were investigated by low temperature photoluminescence experiments on quantum well structures. The linear graded buffer approach was found to result in superior heterostructure properties due to the two dimensional growth mode during the whole growth process resulting in the typical cross hatched surface morphology. In contrast, the use of step graded buffer layers resulted in three dimensional layer growth and inferior layer quality. However, by increasing the number of steps, i.e., reducing the change in the lattice constant for each step and thus approaching a linear grading, two dimensional growth is recovered. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118078
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  • 3
    Electronic Resource
    Electronic Resource
    Bistability in an uncatalyzed bromate oscillator in a continuously fed stirred tank reactor (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 583-586 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Uncatalyzed gallic acid oscillating system has been investigated in a continuously fed stirred tank reactor (CSTR). In the [Bromate]0–[Bromide]0 concentration space, a region has been located where a bistability is observed between an oscillatory branch and a flow branch. To our knowledge this is the first evidence of bistability in an uncatalyzed bromate oscillator. Some observations have been explained in terms of the skeleton mechanism proposed in the past. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470854
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  • 4
    Electronic Resource
    Electronic Resource
    Identification and Kinetic Study of the Peroxymalonyl Radical in the Aerobic Oxidation of Malonic Acid by Cerium(IV) (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 6372-6373 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00128a033
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  • 5
    Electronic Resource
    Electronic Resource
    Aluminium alloys in sulfuric acid Part II: Aluminium-oxygen cells (1996)
    Springer
    Journal of applied electrochemistry 26 (1996), S. 1217-1223 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Aluminium alloys were tested in Al/O2 cells with strongly acidic electrolytes containing minor amounts of chloride ions. The faradaic efficiency, the maximum discharge capacity and the peak power of various Al/O2 cells were evaluated. The temperature dependence of the faradaic efficiency was measured for an Al/O2 cell over the temperature range from 15 to 50°C. With a zinc-containing aluminium alloy, a faradaic efficiency of 84% and a cell voltage of 1.6 V at open circuit and 0.7 V at 100 mA cm−2 could be reached. The highest peak power 120 mW cm−2, was obtained with an Al-Zn/Sn alloy. On the basis of the solubility of the anode products in the electrolyte, a limiting specific energy of 70 Wh kg−1 was estimated. The cell voltage depends on the Al-alloys and on the catalyst used in the oxygen electrode. The cell voltage could be increased by about 200 mV when replacing the Pt-catalysed oxygen electrode with a noble-metal-free (CoCAA/DCD) electrode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249923
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  • 6
    Electronic Resource
    Electronic Resource
    Optimized zinc electrode for the rechargeable zinc–air battery (1998)
    Springer
    Journal of applied electrochemistry 28 (1998), S. 895-898 
    Details
    ISSN: 1572-8838
    Keywords: zinc–air battery ; pasted zinc electrode ; cellulose ; cycle life
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract For the development of a long-lived, electrically rechargeable zinc–air battery the structure and wettability of pasted zinc electrodes were optimized. Pasted zinc electrodes containing 1 to 10% cellulose but having almost the same nominal capacities were prepared and tested in zinc/oxygen cells. The effect of discharge rate on cell voltage and delivered capacity, as well as the maximum power, were measured. Furthermore, cell charge–discharge behaviour and cycle life were examined. After different times of operation, the porosity and the pore size distribution of the pasted zinc electrodes were measured by means of mercury porosimetry. The cycle life and peak power drain capability of the Zn/oxygen battery could be substantially improved by the addition of 10wt% cellulose to the pasted zinc electrode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003464011815
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  • 7
    Electronic Resource
    Electronic Resource
    On the structure and stability of nanoscale materials: a two-dimensional model (1995)
    Springer
    The European physical journal 97 (1995), S. 503-510 
    Details
    ISSN: 1434-6036
    Keywords: 61.55.F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated numerically using the Metropolis Monte Carlo algorithm two-dimensional systems of about 3000 classical particles interacting via a Lennard-Jones potential and being subjected to periodic boundary conditions. In this model we consider metastable structures of small crystalline grains which are randomly oriented relative to each other and which are interconnected by a network of boundaries. The atomic structure within the grains being composed of about 500 atoms each is a nearly ideal triangular lattice. The network of boundaries however has a highly defective structure which is determined by the boundary conditions enforced by the crystalline grains. It is the objective of our work to develop a conceptually simple model for nanocrystalline materials, which can be used for a qualitative description of their complex properties. The main ingredient of the model is its property to relax into a metastable state consisting of intrinsically well ordered crystalline grains connected by a highly defective intergranular component. For that state we compute the static structure factor and the pair correlation function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01322431
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  • 8
    Electronic Resource
    Electronic Resource
    Stability of wheelset-track dynamics for high frequencies (1997)
    Springer
    Archive of applied mechanics 67 (1997), S. 353-363 
    Details
    ISSN: 1432-0681
    Keywords: Key words rail dynamics ; contact mechanics ; stability of motion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary In this paper we investigate the stability behaviour of wheelset-track dynamics for high frequencies. Both the contact and the track model are frequency domain models. The discrete support of the rail as well as nonstationary contact is considered. The high frequency interactions between track and contact mechanics can be described as a feedback system, and a stability analysis can be performed in the frequency domain. Finally, the stability behaviour of an ICE-wheelset on a UIC60 track is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050123
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  • 9
    Electronic Resource
    Electronic Resource
    On the Defect Structures in Te-Doped GaAs (1997)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 57-58 (July 1997), p. 425-430 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/25/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.57-58.425.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    A flow cytometric approach for characterization and differentiation of bacteria during microbial processes (1995)
    Springer
    Applied microbiology and biotechnology 43 (1995), S. 93-101 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The analysis of growing or resting bacterial populations by flow cytometry offers several advantages over traditional methods for determining mean-value parameters. This method has been applied here to measure both the distribution of single-cell fluorescence intensity and the light-scatter behaviour of the methylotrophical strains of Methylobacterium rhodesianum MB126 and Methylocystis GB25 as well as Pseudomonas fluorescens and a strain isolated from the soil. The four different bacterial populations were analysed concerning the DNA and the poly-3-hydroxybutyrate (PHB) content. A new cell-preservation method is presented. Optimized staining methods for each strain were developed in detail, in two cases DNA had to be dehybridized before staining with a mixture of mithramycin/ethidium bromide. Nile red is used for detecting PHB. Both stains were excited by an argonion laser at 488 nm; fluorescence emission for mithramycin/ethidium bromide was measured from 520 nm and for Nile red from 600 nm onwards. It is shown that changes in the DNA content and in the forward-light-scattering behaviour of the bacterial strains chosen were measurable. These changes could be related to different cultivation conditions and correlated, in the case of strains that accumulate PHB, with alterations of that biopolymer content. In addition it was found that these methods provide a contribution to the differentiation of mixed bacterial populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170629
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