The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Mirko Todorovski - One of the best experts on this subject based on the ideXlab platform.
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transformer voltage regulation Compact Expression dependent on tap position and primary secondary voltage
IEEE Transactions on Power Delivery, 2014Co-Authors: Mirko TodorovskiAbstract:This letter presents a Compact transformer voltage regulation Expression which accounts for off-nominal tap position and voltage deviation from the nominal value. The Expression is validated through comparison with the common Expressions used in the literature. It is shown that the primary/secondary voltage variation has a certain influence on the results which were not taken into account in previous Compact forms of the voltage regulation Expression.
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Transformer Voltage Regulation—Compact Expression Dependent on Tap Position and Primary/Secondary Voltage
IEEE Transactions on Power Delivery, 2014Co-Authors: Mirko TodorovskiAbstract:This letter presents a Compact transformer voltage regulation Expression which accounts for off-nominal tap position and voltage deviation from the nominal value. The Expression is validated through comparison with the common Expressions used in the literature. It is shown that the primary/secondary voltage variation has a certain influence on the results which were not taken into account in previous Compact forms of the voltage regulation Expression.
Heinz Neudecker - One of the best experts on this subject based on the ideXlab platform.
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a Compact Expression for the variance of sample second order moments in multivariate linear relations an alternative proof of satorra s result
Statistics & Probability Letters, 1994Co-Authors: Heinz NeudeckerAbstract:Abstract Inspired by Satorra's (1992) paper we present a Compact Expression for the variance of (uncentred) sample second-order moments in multivariate linear relations under an independence assumption.
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A Compact Expression for the variance of sample second-order moments in multivariate linear relations — an alternative proof of Satorra's result
Statistics & Probability Letters, 1994Co-Authors: Heinz NeudeckerAbstract:Abstract Inspired by Satorra's (1992) paper we present a Compact Expression for the variance of (uncentred) sample second-order moments in multivariate linear relations under an independence assumption.
Yuriy Sizyuk - One of the best experts on this subject based on the ideXlab platform.
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free energy of quantum spin systems functional integral representation
Physical Review B, 2017Co-Authors: P Wolfle, Natalia B Perkins, Yuriy SizyukAbstract:In this work, we propose a method for calculating the free energy of anisotropic quantum spin systems. We use the Hubbard-Stratonovich transformation to express the partition function of a generic bilinear superexchange Hamiltonian in terms of a functional integral over classical time-dependent fields. In the general case the result is presented as a product of traces over single spins subject to a time-dependent field. The traces may be evaluated in closed form in the case of systems with large Ising anisotropy. In the general case we derive a Compact Expression for the contribution of Gaussian spin fluctuations to the free energy. We show how anisotropic spin interactions lead to anisotropies in the free energy, giving rise to pinning of the spontaneous magnetization along preferred directions
Amarpreet Rattan - One of the best experts on this subject based on the ideXlab platform.
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Minimal factorizations of permutations into star transpositions
Discrete Mathematics, 2009Co-Authors: John Irving, Amarpreet RattanAbstract:We give a Compact Expression for the number of factorizations of any permutation into a minimal number of transpositions of the form (1i). This generalizes earlier work of Pak in which substantial restrictions were placed on the permutation being factored. Our result exhibits an unexpected and simple symmetry of star factorizations that has yet to be explained in a satisfactory manner.
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Minimal Factorizations of Permutations into Star Transpositions
Discrete Mathematics and Theoretical Computer Science, 2008Co-Authors: John Irving, Amarpreet RattanAbstract:We give a Compact Expression for the number of factorizations of any permutation into a minimal number of transpositions of the form $(1 i)$. Our result generalizes earlier work of Pak ($\textit{Reduced decompositions of permutations in terms of star transpositions, generalized catalan numbers and k-ary trees}$, Discrete Math. $\textbf{204}$:329―335, 1999) in which substantial restrictions were placed on the permutation being factored.
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Factorizations of permutations into star transpositions
arXiv: Combinatorics, 2006Co-Authors: John Irving, Amarpreet RattanAbstract:We give a Compact Expression for the number of factorizations of any permutation into a minimal number of transpositions of the form $(1 i)$. Our result generalizes earlier work of Pak in which substantial restrictions were placed on the permutation being factored.
Darius Germanas - One of the best experts on this subject based on the ideXlab platform.
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the general harmonic oscillator brackets Compact Expression symmetries sums and fortran code
Nuclear Physics, 2001Co-Authors: G P Kamuntavicius, R K Kalinauskas, Bruce R Barrett, Saulius Mickevicius, Darius GermanasAbstract:We present a very simple Expression and a Fortran code for the fast and precise calculation of three-dimensional harmonic-oscillator transformation brackets. The complete system of symmetries for the brackets along with analytical Expressions for sums, containing products of two and three brackets, is given.