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  • Articles  (135)
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  • Books  (2)
  • Articles  (135)
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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 2881-2888 
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 37 (1996), S. 6570-6581 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Complete orbit–orbit branching rules are found for the classical algebra–maximal reductive subalgebra pairs Am+n+1⊃Am⊕An⊕u(1), Bm+1⊃Bm⊕u(1), Cm+1⊃Am⊕u(1), Dm+1⊃Dm⊕u(1), and Dm+1⊃Am⊕u(1). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 538 (1992), S. 37-49 
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present predictive and accurate modeling of base and collector currents in poly-Si emitter bipolar transistors Ref. . Using a standard 0.8 μm bipolar complementary metal–oxide–semiconductor technology process flow Ref. , numerous experiments are performed. The base and emitter doping profiles are varied intentionally over a wide range in a controlled manner, so as to extract a self-consistent set of apparent band-gap narrowing, minority-carrier mobility, intrinsic concentration parameter, and Auger recombination rate that is valid for simultaneously modeling bipolar transistor base and collector currents. The standard nature of the fabrication process technology chosen for this study allows the results to be more generally applicable. The doping concentrations for physical device simulations are taken directly from secondary-ion-mass spectrometry measurements. These profiles are then verified using spreading resistance measurements and capacitance–voltage measurements. It is shown that the measured base and collector currents for all experiments at room temperature can be fit simultaneously using Klaasen's unified apparent band-gap narrowing and mobility model Ref. . The emitter poly-Si/epi-Si interface (surface) hole recombination velocity is derived as a function of the emitter implant dose (arsenic concentration in the emitter) consistent with the model mentioned above. Sensitivity of the simulation results to model parameters is shown. It is further shown that the emitter implant dose can be used as a bipolar transistor optimization parameter. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 37 (1996), S. 4750-4757 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Complete orbit–orbit branching rules are derived for each classical algebra–maximal-subalgebra pair Cm+nCm⊕Cn, Bm+nDm⊕Bn, Dm+nDm⊕Dn. Since each pair is equal rank, and algebra and subalgebra Weyl sectors line up, the integrity basis in each case consists of the subalgebra orbits contained in the fundamental orbits of the algebra. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Shock waves 4 (1994), S. 51-53 
    ISSN: 1432-2153
    Keywords: Chemical kinetics ; Detection sensitivity ; Multiple-reflection cell ; UV absorption spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract The improvement of the detection limit in optical concentration measurements by means of multiple-reflection cells (MRC) has become a well established method in absorption spectroscopy. To apply such an experimental method to shock tubes, several technical problems have to be solved. The use of special optical cells showing mechanical ruggedness is required. In this report we present such a MRC designed for a cylindrical shock tube with an inner diameter of 100 mm. By means of 8 mirrors (optical coated stainless steel) the absorption length has been increased by almost one order of magnitude (863 mm) while the optical path is kept in one plane. The use of fixed flat mirrors provides a very high mechanical stability, which facilitates the application to shock tubes. The first experimental results with this MRC were obtained by measuring the thermal decomposition of O3 behind incident shock waves using an UV laser beam. A direct comparison to the signals simultaneously detected by the use of the conventional absorption length (i.e. the tube diameter of 100 mm) documents the suitability of this MRC for applications in chemical kinetics.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 53 (1992), S. 637-640 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Gaussian effective potential for the ground state of theФ 4-theory in 1+1 dimensions shows a symmetry breaking above a critical coupling constant. The restoration of the symmetry at high temperatures and the role of the renormalization are discussed.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 66 (1995), S. 491-494 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The damping of a massless fermion coupled to a massless scalar particle at finite temperature is considered using the Braaten-Pisarski resummation technique. First the hard thermal loop diagrams of this theory are extracted and effective Green's functions are constructed. Using these effective Green's functions the damping rate of a soft Yukawa fermion is calculated. This rate provides the simplest example for the damping of a soft particle. To leading order it is proportional tog 2 T, whereas the one of a hard fermion is of higher order.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 353 (1995), S. 301-310 
    ISSN: 1434-601X
    Keywords: 11.30.Qc ; 11.90.+t
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the cluster expansions for n-point Green functions we derive a closed set of dynamical equations of motion for connected equal-time Green functions by neglecting all connected functions higher than 4 th order for theλΦ 4-theory in 1 + 1 dimensions. We apply the equations to the investigation of spontaneous symmetry breaking, i.e. to the evaluation of the effective potential at temperatureT=0. Within our momentum space discretization we obtain a second order phase transition (in agreement with the Simon-Griffith theorem) and a critical coupling ofλ crit /4m 2=2.446 as compared to a first order phase transition andλ crit /4m 2=2.568 from the Gaussian effective potential approach.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Applied microbiology and biotechnology 13 (1981), S. 145-150 
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Using the model presented in part I, the measured time and spacial variations of process variables were simulated with satisfactory accuracy. Especially the experimentally found minima of the longitudinal dissolved oxygen concentration profiles in the substrate limiting growth range, which are caused by the transition from oxygen transfer limited to substrate limited growth along the tower, can be simulated with great accuracy.
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