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  • 1
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    Dynamic Spectrum Management (2021)
    Springer Nature
    Details
    Publication Date: 2024-04-11
    Description: This open access book, authored by a world-leading researcher in this field, describes fundamentals of dynamic spectrum management, provides a systematic overview on the enabling technologies covering cognitive radio, blockchain, and artificial intelligence, and offers valuable guidance for designing advanced wireless communications systems. This book is intended for a broad range of readers, including students and professionals in this field, as well as radio spectrum policy makers.
    Keywords: Engineering ; Electrical engineering ; Wireless communication systems ; Mobile communication systems ; Computer organization ; Computers ; Artificial intelligence ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TJ Electronics and communications engineering::TJK Communications engineering / telecommunications ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TJ Electronics and communications engineering::TJK Communications engineering / telecommunications::TJKW WAP (wireless) technology ; thema EDItEUR::U Computing and Information Technology::UT Computer networking and communications ; thema EDItEUR::U Computing and Information Technology::UY Computer science::UYQ Artificial intelligence ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TJ Electronics and communications engineering::TJK Communications engineering / telecommunications ; thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TJ Electronics and communications engineering::TJK Communications engineering / telecommunications::TJKW WAP (wireless) technology ; thema EDItEUR::U Computing and Information Technology::UT Computer networking and communications ; thema EDItEUR::U Computing and Information Technology::UY Computer science::UYQ Artificial intelligence
    Language: English
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    Format: image/jpeg
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    E-BOOK
  • 2
    Electronic Resource
    Electronic Resource
    Intramolecular screening of intermolecular forces (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 4626-4635 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: By use of nonlocal polarizability densities, we analyze the intramolecular screening of intermolecular fields. For two interacting molecules A and B with weak or negligible charge overlap, we show that the reaction field and the field due to the unperturbed charge distribution of the neighboring molecule are screened identically via the Sternheimer shielding tensor and its generalizations to nonuniform fields and nonlinear response. The induction force on nucleus I in molecule A, derived from perturbation theory, results from linear screening of the reaction field due to B and nonlinear screening of the field from the permanent charge distribution of B. In general, at first or second order in the molecular interaction, the screening-tensor expressions for the force on nucleus I involve susceptibilities of one order higher than the expressions derived from perturbation theory. The first-order force from perturbation theory involves permanent charge moments, while the first-order screened force involves linear response tensors; and the second-order screened force depends on hyperpolarizabilities, while second-order induction effects are specified in terms of static, lowest-order susceptibilities. The equivalence of the two formulations for these forces, order by order, is a new illustration of the interrelations we have found among permanent moments, linear-response tensors, and nonlinear response. This work also provides new insight into the dispersion forces on an individual nucleus I in molecule A by separating the forces into two distinct terms—the first term results from changes in the reaction of A to the fluctuating charge distribution of the neighboring molecule B, when nucleus I shifts infinitesimally, and the second term stems from changes in correlations of the fluctuating charge distribution of A itself. Changes in the fluctuation correlations are determined by changes in the classical Coulomb field of nucleus I and by the imaginary part of the hyperpolarizability density of A. The full dispersion force on nucleus I in A is equivalent to the screened force of an effective fluctuating field due to B at imaginary frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464990
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  • 3
    Electronic Resource
    Electronic Resource
    Erratum: Investigation of glassy behavior of lead magnesium niobate relaxors [J. Appl. Phys. 79, 8615 (1996)] (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5518-5518 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363833
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  • 4
    Electronic Resource
    Electronic Resource
    Investigation of glassy behavior of lead magnesium niobate relaxors (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8615-8619 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dielectric behavior of a solid solution, 10 mol % lead titanate in lead magnesium niobate, vs temperature at different frequencies is measured and analyzed. The shortcomings of the Vogel–Fulcher relationship are discussed. A more reasonable new relationship: ω=ω0 exp[−(T0/Tm)p] is introduced to characterize the relation between the frequency (ω) and the temperature (Tm) at the dielectric constant maximum of the relaxor ferroelectrics. The value of the parameter p in the relationship can be used to characterize the dielectric relaxation strength of relaxor ferroelectrics as well as the relation among the ferroelectrics, the relaxor ferroelectrics, the Debye medium and glass. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362685
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  • 5
    Electronic Resource
    Electronic Resource
    Interaction-induced contributions to polarizability anisotropy relaxation in polar liquids (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 6325-6332 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We use molecular dynamics simulation to investigate polarizability anistropy relaxation in two polar liquids, methanol and acetonitrile, which have similar dielectric constants at room temperature, but are very different at the molecular level. Interaction-induced contribution to the polarizability is included using first-order perturbation theory and separated into a component which projects along the sum of molecular polarizability anistropies and relaxes through collective reorientation and a "collision induced'' component which relaxes through other mechanisms involving mainly translational motion. We find that interaction-induced effects on the polarizability anisotropy time correlation are important on all relevant time scales, especially for the more polarizable acetonitrile. In methanol, even though most of the molecular polarizability is along the CO bond, we find that the OH bond dynamics make a substantial direct contribution to polarizability anisotropy relaxation. We compare our results to the experimentally determined nuclear portion of the optical Kerr effect response and discuss their implications for the use of this response in solvation dynamics theories. We find that the short-time optical Kerr response of acetonitrile is dominated by collision-induced polarizability dynamics, while librational orientational dynamics is the main contributor for methanol. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470413
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  • 6
    Electronic Resource
    Electronic Resource
    Conformational Control of Intramolecular Hydrogen Bonding in Heme Models: Maximal CoII-O2 Binding in a C-Clamp Porphyrin (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 4191-4192 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00119a044
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  • 7
    Electronic Resource
    Electronic Resource
    The quantitative trait gene latexin influences the size of the hematopoietic stem cell population in mice (2007)
    [s.l.] : Nature Publishing Group
    Nature genetics 39 (2007), S. 178-188 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] We mapped quantitative trait loci that accounted for the variation in hematopoietic stem cell (HSC) numbers between young adult C57BL/6 (B6) and DBA/2 (D2) mice. In reciprocal chromosome 3 congenic mice, introgressed D2 alleles increased HSC numbers owing to enhanced proliferation and self-renewal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng1938
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  • 8
    Electronic Resource
    Electronic Resource
    Adaptive frequency estimation of sinusoidal signals in colored non-Gaussian noises (2000)
    Springer
    Circuits, systems and signal processing 19 (2000), S. 517-533 
    Details
    ISSN: 1531-5878
    Keywords: Frequency estimation ; adaptive algorithm ; higher-order statistics ; non-Gaussian noise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper studies the problem of sinusoidal frequency estimation in colored non-Gaussian ARMA noises. A new adaptive approach is proposed by using the second-and third-order statistics of the measurements. Because of the simultaneous establishment of the signal and noise models, the new approach is applicable for tracking the frequencies at each time instant for stationary and nonstationary signal and/or noise cases. The effectiveness of the new approach is demonstrated by extensive computer simulations. As expected, the approach proposed in this paper outperforms the correlation-based approaches in suppressing the effects of the colored non-Gaussian ARMA noises.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01271286
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  • 9
    Electronic Resource
    Electronic Resource
    New criteria for blind source separation using second-order cyclic statistics (2000)
    Springer
    Circuits, systems and signal processing 19 (2000), S. 43-58 
    Details
    ISSN: 1531-5878
    Keywords: Blind source separation ; adaptive algorithm ; second-order cyclic statistics ; convergence analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper addresses the problem of blind separation of cyclostationary sources. By using the cyclostationarity property of the source signals, new criteria based on second-order cyclic statistics (SOCS) are established, from which two algorithms for blind source separation are proposed. Compared with the existing higher-order statistics-based approaches, our new approach requires few data samples and does not impose any restrictions on the probability distributions of the source signals. Simulation results are given to demonstrate the effectiveness of this new approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01229991
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  • 10
    Electronic Resource
    Electronic Resource
    Lapping Process of Diamond Cutting Tool by Molecular Dynamics Simulating (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 359-360 (Nov. 2007), p. 249-253 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Molecular dynamics is a rapidly developing field of science and has become an establishedtool for studying the dynamic behavior of material machining. A three-dimensional moleculardynamics (MD) model about the atoms of the diamond cutting tools and the diamond grits is built byusing the molecular dynamics. The Tersoff potential function is used to calculate the force and potentialenergy among the atoms of the diamond tools and the atoms of the diamond grits. The lappingprocesses at a special cutting depth are simulated. The variety of the specimen potential energy in thelapping process is observed. The mechanism of the diamond micro machining and the form of thesurface formation are given by comparing the distribution maps of atoms in initial and cutting states.This study will give a strong support to the diamond cutting tools’ lapping
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.359-360.249.pdf
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