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Recently (see ibid., vol.43, pp.613-14, July 1996), Marinov and Shivakumar presented upper and lower bounds for the delay time for an n-cell RC ladder network with capacitive load. Their results can be improved as shown in this comment
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A formula denoting the `Elmore¿ delay of an N-stage RC ladder network is developed. The delay Ted at any stage M of the network is shown to be Ted = RC/2 {N2¿(N¿M)2}
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PurposeDetectors such as birdcage coils often consist of networks of coupled resonant circuits that must produce specified magnetic field distributions. In many cases, such as quadrature asymmetric insert body coils, calculating t...
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PurposeDetectors such as birdcage coils often consist of networks of coupled resonant circuits that must produce specified magnetic field distributions. In many cases, such as quadrature asymmetric insert body coils, calculating the capacitance values required to achieve specified currents and frequencies simultaneously is a challenging task that previously had only approximate or computationally inefficient solutions.
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This paper takes into consideration a number of different ladder networks showing links with the so-called Golden Ratio φ = 1.6180339..., which is embedded into the Fibonacci sequence. Discreteness and periodicity in electronic l...
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This paper takes into consideration a number of different ladder networks showing links with the so-called Golden Ratio φ = 1.6180339..., which is embedded into the Fibonacci sequence. Discreteness and periodicity in electronic ladder networks seem to appear as the main features able to include Fibonacci numbers. For instance, in the telecommunication environment, transmission lines can be studied with a given approximation by simplified discrete ladder networks made by a sequence of passive identical cells, such as R-R; R-C; R-L; C-R; L-R; L-C; C-L; directly and electrically coupled each other. In this context, the so called Golden Ratio frequently appears in particular conditions, without a specific reason, at least to our best knowledge, and its presence, so far, still does represent a sort of mystery.
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In this paper, a methodology to solve radial distribution networks, with constant current and/or impedance loads as well as shunt capacitor banks, is proposed. The techniques currently available to solve such systems are based eit...
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In this paper, a methodology to solve radial distribution networks, with constant current and/or impedance loads as well as shunt capacitor banks, is proposed. The techniques currently available to solve such systems are based either on iterative methods or on the bus impedance matrix. In both cases, the elaboration times are quite high since these are related, for iterative methods, to the overall number of iterations, and, for those methods based on the impedance matrix, to the inversion of the admittance matrix. The method developed here is the extension of a technique that is valid to solve networks made of impedances with one supply point, The methodology can also be applied in the solution, with the backward/forward methodology, of meshed systems having voltage-dependent loads and PV nodes. After having described the two cited networks' analysis methodologies, the new methodology is developed and its implementation is described. The comparison of the computational performances, in terms of CPU times, between the iterative method, the method using the bus impedance matrix and the one developed in this paper provide evidence regarding the efficiency of the latter in strongly reducing the calculation times.
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An explicit formulation is given for the input output voltage function of a general linear LCR ladder structure containing time variable elements. The expression is based on a recursive procedure which allows analysis by inspection.
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We investigate the quantum transport of electrons, phase solitons, etc, through the mesoscopic networks of zero-dimensional quantum dots. Straight and circular ladders are chosen as networks with each coupled with three semi-infin...
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We investigate the quantum transport of electrons, phase solitons, etc, through the mesoscopic networks of zero-dimensional quantum dots. Straight and circular ladders are chosen as networks with each coupled with three semi-infinite leads (with one incoming and the other two outgoing). Two transmission probabilities as functions of the incident energy epsilon show a transition from anti-phase aperiodic to degenerate periodic spectra at the critical energy epsilon(c) which is determined by a bifurcation point of the bulk energy dispersions. TPs of the circular ladder depend only on the parity of the winding number. The introduction of a single missing bond (MB) or missing step doubles the period of the periodic spectra at epsilon > epsilon(c). Shift of the MB by a lattice constant results in a striking switching effect at epsilon < epsilon(c). In the presence of the electric-field-induced spin-orbit interaction (SOI), an obvious spin filtering occurs for the spin-unpolarized injection. For the spin-polarized injection, on the other hand, the spin transport shows spin-flip (magnetization reversal) oscillations with respect to SOI. We also show a role of soliton in the context of its transport through the ladder networks.
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Two ladder-structure recurrence formulas have been suggested for the analysis of a nonuniform distributed network. An array has been established to form the approximate circuit polynomials in the S domain for studying pole-zero be...
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Two ladder-structure recurrence formulas have been suggested for the analysis of a nonuniform distributed network. An array has been established to form the approximate circuit polynomials in the S domain for studying pole-zero behaviours of this network.
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Educational games enable students to learn and play. The use of educational games as learning media can also encourage users to discover and build their own knowledge of learning. The purpose of this study is to show the impact of...
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Educational games enable students to learn and play. The use of educational games as learning media can also encourage users to discover and build their own knowledge of learning. The purpose of this study is to show the impact of using educational games on student learning outcomes. Educational games can be used as an alternative choice as a learning media. The research instruments used were post test and pre test. Data analysis was done by comparing the results of the post test and pre test. This analysis was conducted to see whether there were changes in student learning outcomes. The results shows that students’ learning outcome are increase by implementing educational games.
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Spectral properties of ladder and spatial electrical networks are considered. Dynamic properties of the networks are characterised by eigenvalues of the Jacobi cyclic state matrix. The effective formulas for eigenvalues of appropr...
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Spectral properties of ladder and spatial electrical networks are considered. Dynamic properties of the networks are characterised by eigenvalues of the Jacobi cyclic state matrix. The effective formulas for eigenvalues of appropriate uniform systems are given. Numerical calculations were made using MATLAB.
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