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  • American Institute of Physics (AIP)  (15)
  • Tübingen: University of Tübingen, Faculty of Economics and Social Sciences
  • 1985-1989  (15)
  • 1
    Electronic Resource
    Electronic Resource
    TFTR data management system (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1892-1894 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Developments in the tokamak fusion test reactor (TFTR) data-management system supporting data acquisition and off-line physics data reduction are described. Data from monitor points, timing channels, transient recorder channels, and other devices are acquired and stored for use by on-line tasks. Files are transferred off line automatically. A configuration utility determines data acquired and files transferred. An event system driven by file arrival activates off-line reduction processes. A post-run process transfers files not shipped during runs. Files are archived to tape and are retrievable by digraph and shot number. Automatic skimming based on most recent access, file type, shot numbers, and user-set protections maintains the files required for post-run data reduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139163
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  • 2
    Electronic Resource
    Electronic Resource
    Diffusion in three different dislocations in an fcc crystal (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4491-4493 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical study is made of dislocation pipe self-diffusion in an fcc crystal for three differing dislocation structures to ascertain the correlation factor, diffusivity, and mobility in an electric field. The three structures may be described as a pure edge dislocation with the usual Burgers vector b=a/2[110]. The other two are mixed dislocations with b=a[01¯0] and either a line sense of ξ=a[100] or ξ=a[101]. The latter two are similar to an edge-type dislocation and are formed by the removal of one-half of a (010) plane of atoms whose edge follows these directions. It is found that very little difference exists in the transport processes in these three structures. Thus, although the latter two dislocations have a major screw character in the sense of a mixed dislocation, the transport is dominated by the edge character which in turn is controlled by the binding energy of the vacancy to the core. Additionally, the ratio of the mobility to diffusivity in an electric field is proportional to the reciprocal of the correlation factor as found in the past for other self-diffusion situations, and these authors conclude that such a result is an unprovable axiom of correlated crystalline transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341274
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  • 3
    Electronic Resource
    Electronic Resource
    Conceptual design of the physics support portion of the CIT instrumentation and control system (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1771-1773 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The conceptual design of the data handling system for the Compact Ignition Tokamak (CIT) takes advantage of the recent and upcoming advances in the technologies of database management systems, workstations, networking, and front-end processing. The software configuration of a diagnostic's front-end signal conditioning, data acquisition, and data reduction by means of filling in tables and specifying "objects'' for the data transformations will provide a more powerful tool for efficient application "programming.'' The maintenance of an audit trail of chains of transformations (input data and processes) will permit identification and recalculation of results which are affected by modifications of calibrations and processing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140107
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  • 4
    Electronic Resource
    Electronic Resource
    Laser-T-jump apparatus for kinetic studies of ion transport through planar (artificial) lipid membranes (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1200-1203 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Relaxation phenomena associated with ion transport through planar bimolecular lipid membranes may be studied by measurement of current transients which are induced by a temperature jump. The T jump is obtained by absorption of an IR-light pulse from a Nd-glass laser by the membrane and its aqueous environment. The apparatus described allows the detection of characteristic time constants between approximately 10 μs and several seconds. Processes can be resolved if the underlying change of enthalpy exceeds 1 kcal/mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139750
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  • 5
    Electronic Resource
    Electronic Resource
    A proposed model to explain impurity-induced layer disordering in AlAs-GaAs heterostructures (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 2547-2549 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Impurity-induced disordering of III-V compound semiconductor quantum well heterostructures and superlattices has been extensively studied. However, the theories proposed to explain this phenomenon have dealt primarily with vacancy diffusion mechanisms and have not succeeded in explaining all the experimental observations satisfactorily. In this communication, we propose a two-atom ring mechanism of diffusion based on a simplified model of covalent bonding in III-V compound semiconductors and suggest that the phenomenon of intermixing is a consequence of a lowering in the activation energy due to coulombic interactions between the substitutional impurity atoms and the host atoms. This mechanism is consistent with experimental observations and is able to predict the behavior of other dopants. The additive effect of the simultaneous presence of different dopants can also be explained by this theory which could possibly be used to achieve controlled layer disordering for use in device technology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342777
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  • 6
    Electronic Resource
    Electronic Resource
    Poincaré covariant infraparticle sectors (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 1636-1643 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Footing on the infraparticle picture of quantum electrodynamics, a Poincaré covariant description of asymptotic sectors, containing n charged particles (n≥1) and the associated radiation field, is given. The analogy of this method to Wigner's description of elementary particles is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527470
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  • 7
    Electronic Resource
    Electronic Resource
    A comparison of the implementation and performance of the Nanbu and Bird direct simulation Monte Carlo methods (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 3661-3668 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Since Bird [Phys. Fluids 6, 1518 (1963)] first proposed the idea of direct simulation Monte Carlo (DSMC) techniques in order to model rarefied gas flows, a concern has been that his method does not provide a solution to the Boltzmann equation. Several simulation schemes have now been developed and, in a review of these methods, Nanbu [J. Phys. Soc. Jpn. 52, 3382 (1983)] showed that only his method [J. Phys. Soc. Jpn. 49, 2042 (1980)] gave a true solution to the Boltzmann equation. However, Nanbu's simulation method is also the most computationally expensive scheme and in his review paper he recommended the use of the Bird technique for complicated engineering problems. Nanbu's method also suffers from the apparent disadvantage that momentum and energy are not conserved at each collision. With the advent of the supercomputer the relative expense of the methods will inevitably be of lesser importance so that the testing of the Nanbu method in an engineering context is desirable. A detailed study of the implementation and performance of the Bird and Nanbu simulation schemes has therefore been carried out with reference to the expansion of a gas into vacuum. The results reported herein show, however, that in addition to increased computational overheads, the Nanbu method suffers from further defects that make its implementation more difficult. It is concluded that the Nanbu method is generally less flexible than that of Bird and that greater care must be exercised if meaningful results are to be obtained using the Nanbu approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866402
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  • 8
    Electronic Resource
    Electronic Resource
    Mobility and diffusivity for vacancy diffusion in a simple cubic edge dislocation (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 720-722 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model of an edge dislocation in a simple cubic crystal is constructed for a [0–10] Burgers vector where vacancy transport along the edge of the extra half plane of ions is considered. The model considers a tight-binding approximation of the vacancy to the compressed region of the core and carries the calculation to the limit of an infinite length of dislocation. As a consequence the limit of the tight-binding approximation becomes exact. Previous comparison of the model with a loosely bound model illustrated the applicability of the tight-binding approximation in all circumstances. Therefore, the model is believed to quite reasonably represent the physical situation. The results of consequence include, unexpectedly, the increase without bounds of the diffusivity and effective charge for electromigration in the limit where the correlation factor becomes zero. The mobility is found to be proportional to the reciprocal of the correlation factor for all jump-frequency responses causing the unusual behavior. The diffusivity becomes large because the number of available vacancies diverges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336188
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  • 9
    Electronic Resource
    Electronic Resource
    Correlation factor for diffusion in an edge dislocation in a simple cubic crystal (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 1869-1871 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The correlation factor for diffusion is constructed for a vacancy mechanism of tracer diffusion in an edge dislocation in a simple cubic lattice. The method of calculation evaluates a weak and tight binding approximation to the problem. Comparison of the two approximations suggests that the tight binding approximation may be preferable under all circumstances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334417
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  • 10
    Electronic Resource
    Electronic Resource
    The diffusivity, mobility, and correlation factor for solute vacancy diffusion in an edge dislocation in a face-centered-cubic crystal (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3077-3079 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An edge dislocation in a face-centered-cubic crystal is considered for the basis of a transport model of solute diffusion by a vacancy mechanism. The Burgers vector for the dislocation is b=a/2[110], and the solute moves along the edge of the extra half plane of atoms within the compressed region of the core. When the vacancy is tightly bound to the dislocation, self-diffusion yields the correlation factor approaching infinity because the number of available vacancies for diffusion becomes large, and the mobility for electromigration divided by the diffusivity becomes infinite because the vacancy wind diverges faster than the diffusivity. When the solute repels the vacancy, the diffusivity becomes small; however, the mobility still becomes large. With solute vacancy attraction, the diffusivity remains of magnitude of unity and the mobility to diffusivity ratio becomes large.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339354
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