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  • 1
    Electronic Resource
    Electronic Resource
    Groups acting on S n × R uk : Generalizations of a construction of Hambleton and Pedersen (1991)
    Springer
    K-Theory 5 (1991), S. 333-354 
    Details
    ISSN: 1573-0514
    Keywords: Surgery ; spaceform problems ; L-groups ; arithmetic groups
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We exhibit infinitely many commensurability classes of smooth closed manifolds M m , for all m ⩾ 12, such that the universal cover of M is the product of a sphere and a Euclidean space and such that π1(M) contains finite dihedral subgroups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00535645
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  • 2
    Electronic Resource
    Electronic Resource
    Optical properties of quasi-zero-dimensional magneto-excitons (1991)
    Springer
    Applied physics 53 (1991), S. 491-502 
    Details
    ISSN: 1432-0630
    Keywords: 71.35 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We discuss the evolution of optical properties of semiconductor quantum wells, as the quasi-two-dimensional electronic states are further confined into quasi-zero dimensions by a perpendicular magnetic field. We show that confinement in all three directions strongly modifies both linear and nonlinear optical response. In particular, quasi-zero-dimensionality makes an ensemble of magneto-excitons a unique many-body system, distinct from higher-dimensional excitons and the one-component Coulomb system in the fractional quantum Hall regime or Wigner crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331538
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  • 3
    Electronic Resource
    Electronic Resource
    Dissertation abstract (1991)
    Springer
    Machine vision and applications 4 (1991), S. 207-207 
    Details
    ISSN: 1432-1769
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01230203
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  • 4
    Electronic Resource
    Electronic Resource
    The impact of differences in the levels of technology on international labor migration (1991)
    Springer
    Journal of population economics 4 (1991), S. 1-12 
    Details
    ISSN: 1432-1475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract In this paper we analyze the patterns of international labor migration in a two-country world where one country's production technology is superior to that of the other country. We exploit an overlapping-generations model which enables us to trace the relevant dynamic considerations. We find that in the absence of international capital movements labor will migrate from the technologically-inferior to the technologically-superior country unless the stationary autarkic equilibrium is characterized by over-investment relative to the Golden Rule and the long-run elasticity of the interest rate with respect to the technological level is sufficiently large, in which case migration will be from the technologically-superior country.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160365
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  • 5
    Electronic Resource
    Electronic Resource
    A small deletion and an adjacent base exchange in a potential stem-loop region of the neurofibromatosis 1 gene (1991)
    Springer
    Human genetics 〈Berlin〉 87 (1991), S. 685-687 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A single-strand conformational polymorphism found in the DNA of a patient with neurofibromatosis 1 (NF1) was shown to be caused by a deletion of a CCACC or CACCT sequence and an adjacent transversion, located about 500 base pairs downstream from the region that codes for a functional domain of the NF1 gene product. This mutation could also be detected in the patient and in his affected daughter by heteroduplex analysis. The deletion removes the proximal half of a small potential stem-loop and interrupts the reading frame in exon 1. A severely truncated protein with a grossly altered carboxy terminus lacking one third of its sequence is expected to be formed from the mutant allele.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00201726
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  • 6
    Electronic Resource
    Electronic Resource
    Role of vacancies and implantation defects in GaAs/AlAs superlattice intermixing (1991)
    Springer
    Journal of materials science 26 (1991), S. 6650-6654 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Ga/Al intermixing in GaAs/AlAs superlattice (SL) structures is studied in the presence of an epitaxially grown dopant (Si) with and without the aid of vacancies. Rapid thermal annealing (900 °C/20 min) after growth is insufficient to induce intermixing without the presence of excess vacancies as observed by Auger electron spectroscopy in conjunction with Ar ion sputtering. Vacancies themselves also enhance the intermixing process, and their role is explained with the recently proposed two-atom ring mechanism of diffusion. The effect of medium dose medium energy Be implantation into the SL is also studied using cross sectional transmission electron microscopy (XTEM). Two types of damage are observed, twins when liquid nitrogen (LN2) is used to cool the sample holder chamber, and high dislocation densities at room temperature conditions. Rapid thermal annealing effectively removes the twins but gives heavy intermixing in the case of the dislocation networks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02402658
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  • 7
    Electronic Resource
    Electronic Resource
    Role of vacancies and implantation defects in GaAs/AlAs superlattice intermixing (1991)
    Springer
    Journal of materials science 26 (1991), S. 6650-6654 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Ga/Al intermixing in GaAs/AlAs superlattice (SL) structures is studied in the presence of an epitaxially grown dopant (Si) with and without the aid of vacancies. Rapid thermal annealing (900 °C/20 min) after growth is insufficient to induce intermixing without the presence of excess vacancies as observed by Auger electron spectroscopy in conjunction with Ar ion sputtering. Vacancies themselves also enhance the intermixing process, and their role is explained with the recently proposed two-atom ring mechanism of diffusion. The effect of medium dose medium energy Be implantation into the SL is also studied using cross sectional transmission electron microscopy (XTEM). Two types of damage are observed, twins when liquid nitrogen (LN2) is used to cool the sample holder chamber, and high dislocation densities at room temperature conditions. Rapid thermal annealing effectively removes the twins but gives heavy intermixing in the case of the dislocation networks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553690
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  • 8
    Electronic Resource
    Electronic Resource
    Interpretation of functional series expansions (1991)
    Springer
    Annals of biomedical engineering 19 (1991), S. 485-508 
    Details
    ISSN: 1573-9686
    Keywords: Kernel interpretation ; Volterra series ; Wiener kernels ; System identification ; Pupil control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract While much research has been devoted to the implementation and application of Volterra and Wiener functional series expansions in the identification and characterization of biological systems, little effort has been focused on the fundamental problem of interpreting the resulting kernels. This paper describes the application of the series to the components of a known model of the human pupil control system. As more complicated elements are put together, insight into kernel interpretation is built up incrementally until the total system is identified. Practical limitations and methods are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000008
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  • 9
    Electronic Resource
    Electronic Resource
    Practical identification of functional expansions of nonlinear systems submitted to non-Gaussian inputs (1991)
    Springer
    Annals of biomedical engineering 19 (1991), S. 401-427 
    Details
    ISSN: 1573-9686
    Keywords: Estimation ; Functional expansions ; Nonlinear systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Time-domain identification of nonlinear systems represented by functional expansions is considered. A general framework is defined for the analysis of three identification methods: the widely used cross-correlation method, Korenberg's method, and a suboptimal least-squares method based on a stochastic approximation algorithm. First, the major characteristics of the underlying estimation problem are pointed out. Then, the identification methods are interpreted as approximations to an optimal estimator, which helps gain insight into their internal functioning and to the investigation of their connections and differences. Examination of results previously published and of the simulations reported in this article indicate that stochastic approximation is an interesting alternative to other existing methods. Identification of a biological system stimulated by a non-Gaussian input confirms the practicality of this approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000004
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  • 10
    Electronic Resource
    Electronic Resource
    The interpretation of kernels — An overview (1991)
    Springer
    Annals of biomedical engineering 19 (1991), S. 509-519 
    Details
    ISSN: 1573-9686
    Keywords: Interpretation ; Kernel shapes ; Models ; Physiological systems ; Usefulness ; Limitations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The kernel identification method is a powerful technique for mathematically representing the dynamic behavior of a nonlinear system. This technique has been applied to a number of physical and physiological systems. An important development which has enhanced the usefulness of the kernel method has been the interpretation of the internal structure of a system by examining the shapes of the higher-degree kernels. Examples of various nonlinear models with known structure are illustrated to show a repertoire of kernel shapes. Variations in parameters of these models result in well-defined changes in the shapes of the kernels. Also, examples are shown of kernels obtained from physiological systems to demonstrate how examination of kernel shapes can lead to accurate predictions of the dynamic behavior of the physiological system. Finally, limitations of the applicable range of the kernel identification method are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000009
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