The unbalanced nature of distribution systems due to single-phase laterals and loads gives difficulty in the fault location. This paper proposes a new location algorithm developed by direct three-phase circuit analysis for systems, which has not been investigated high complexity. proposed overcomes limit conventional algorithm, requires balanced system. It is applicable any power system, but especially useful systems. Its effectiveness proved through many EMTP simulations.

In this paper, an effective fault location algorithm and intelligent diagnosis scheme are proposed. The proposed first identifies locations using iterative estimation of load current at each line section. Then actual is identified, applying the pattern matching rules. If necessary, comparison interrupted with follows generates final decision. Effect uncertainty resistance has been carefully investigated through simulation results that turns out to be very satisfactory.

We investigate the effects of spin-polarized leads on Kondo physics a quantum dot using numerical renormalization group method. Our study demonstrates in an unambiguous way that effect is not necessarily suppressed by lead polarization: While quenched for asymmetric Anderson model, it survives even finite polarizations regime where charge fluctuations are negligible. propose linear tunneling magnetoresistance as experimental signature these behaviors. also report influence spin-flip processes.

We study a double quantum dot, each dot of which is tunnel coupled to superconducting leads. In the Coulomb blockade regime, spin-dependent Josephson coupling between two superconductors induced, as well an antiferromagnetic Heisenberg exchange spins on that can be tuned by phase difference. show correlated spin states---singlet or triplets---on probed via current in dc-superconducting interference device setup.

Current KEPCO's distribution automation system (DAS) provides a very effective restoration solution for the single fault case but cannot handle multiple faults. This paper proposes two-step scheme-sequential and simultaneous restoration-for cases. Efficiency has been achieved by introduction of performance index (RPI) load-balancing algorithm. Test results to show effectiveness proposed scheme are presented, field experience DAS in Korea is described as well

We study the Kondo effect in a single-electron transistor device realized single-wall carbon nanotube. The K-K' double orbital degeneracy of nanotube, which originates from peculiar two-dimensional band structure graphene, plays role pseudo-spin. Screening this pseudo-spin, together with real spin, can result an SU(4) at low temperatures. For such exotic to arise, it is crucial that quantum number conserved during tunneling. Experimentally, conservation not obvious and some mixing channel...

We report transport measurements of gate-tunable Andreev bound states in a carbon nanotube quantum dot coupled to two superconducting leads. In particular, we observe clear features types Kondo ridges, which can be understood terms the interplay between effect and superconductivity. first type (type I), coupling is strong dominant. Levels display anti-crossing middle ridge. On other hand, crossing shown second II) together with 0-$\pi$ transition Josephson junction. Our scenario well only...

As a communication technology plays an integral part in power system, security issues become major concerns. This paper deals with the problems distribution automation system (DAS) which has inherent vulnerability to cyber attacks due its high dependency on and geographically widely spread terminal devices. We analyze types of threats many applications formulate goals. Then we propose efficient protocol achieve these The avoids complex computation any encryption algorithm, considering...

The nonclassical behaviors of a two-level system coupled to harmonic oscillator is investigated in the ultrastrong coupling regime. We revisit variational solution ground state and find that existing do not account accurately for effects such squeezing. suggest new trial wave function demonstrate it has an excellent accuracy on quantum correlation as well energy.

We study the transport properties of a serial double quantum dot (DQD) coupled to two superconducting leads, focusing on Josephson current through DQD and associated 0-$\pi$ transitions which result from subtle interplay between superconductivity, Kondo physics, inter-dot superexchange interaction. examine competition superconductivity physics by tuning relative strength $\Delta/T_K$ gap $\Delta$ temperature $T_K$, for different strengths coupling determined interdot tunneling $t$ level...

This paper proposes an algorithm for determining the optimal composition which means number of links and section switches in a feeder placement automatic distribution automation system (DAS). A DAS is configured by reclosers on power line. The affect operational applications DAS. More lead to better operation but also increased cost maintenance. Thus, this approach switches. Additionally, proposed developed considering various topologies real field. was tested example with eight-feeders...

We investigate the transport properties of ballistic quantum wires in presence Zeeman spin splittings and a spatially inhomogeneous Rashba interaction. The interaction is extended along wire produces gaps energy spectrum, which allow electron propagation only for spinors lying certain direction. For spins opposite direction, waves are evanescent far away from region, plays role scattering center. most interesting case occurs when magnetic field perpendicular to field. Then, asymptotic wave...

We investigate nonperturbatively the charge relaxation resistance and quantum capacitance in a coherent $\mathit{RC}$ circuit strong-coupling regime. find that many-body correlations break universality resistance: (i) The has peaks at finite frequencies ${\ensuremath{\Gamma}}^{*}/\ensuremath{\hbar}$, where ${\ensuremath{\Gamma}}^{*}$ is an effective level broadening, (ii) zero-frequency deviates from universal value when Zeeman splitting comparable to ${\ensuremath{\Gamma}}^{*}$. This...

Abstract Complex oxide systems have attracted considerable attention because of their fascinating properties, including the magnetic ordering at conducting interface between two band insulators, such as LaAlO 3 and SrTiO . However, manipulation spin degree freedom /SrTiO heterointerface has remained elusive. Here, we fabricated hybrid tunnel junctions consisting Co ferromagnets with insertion a Ti layer in between, which clearly exhibit switching tunnelling magnetoresistance effect below 10...

We study the zero-bias magnetoresistance MR of an interacting quantum dot connected to two ferromagnetic leads and capacitively coupled a gate voltage source Vg. investigate effects spin-activity contacts between by introducing effective exchange field in Anderson model. This makes easier negative effects, can even lead giant effect with sign tunable Assuming twofold orbital degeneracy, our approach allows interpret picture MR(Vg) measured S. Sahoo et al. [Nature Phys. 2, 99 (2005)] single...

We report on the fabrication and measurements of a superconducting junction single-crystalline Au nanowire, connected to Al electrodes. The current−voltage characteristic curve shows clear supercurrent branch below transition temperature quantized voltage plateaus application microwave radiation, as expected from Josephson relations. Highly transparent (0.95) contacts very close an ideal limit 1 are formed at interface between normal metal (Au) superconductor (Al). high transparency is...

We explore the photon population dynamics in two coupled circuit QED systems. For a sufficiently weak inter-cavity hopping, as photon-cavity coupling increases, undergoes double transitions first from delocalized to localized phase and then another phase. The latter is distinguished former one; instead of oscillating between cavities, photons rapidly quasi-equilibrate over cavities. These intrigues are attributed an interplay qualitatively distinctive nonlinear behaviors systems utrastrong...

We investigate transport of Cooper pairs through a double quantum dot in the Kondo regime and coupled to superconducting leads. Within nonperturbative slave boson mean-field theory we evaluate Josephson current for two different configurations, parallel series find striking differences between these configurations supercurrent versus ratio $t∕\ensuremath{\Gamma}$, where $t$ is interdot coupling $\ensuremath{\Gamma}$ leads: critical ${I}_{c}$ decreases monotonously with...

We propose mechanical force realization based on flux quantization in the pico-Newton range. By controlling number of quantum a superconducting annulus, can be created as integer multiples constant step. For 50 nm-thick Nb annulus with inner and outer radii 5 $\mu$m 10 $\mu$m, respectively, field gradient T/m step is estimated to 184 fN. The stability against thermal fluctuations also addressed.

Controlling spin interactions in magnetic-molecules/metal is essential for spintronic applications. Recent studies showed that using small molecule coordination, one could switch off the between magnetic-molecules and metal substrates. However, this control should not be limited to two-state switching. The strength of interaction can reduced, but ``off'' by proper selection molecules. To demonstrate this, we considered two contrasting systems, $\mathrm{N}{\mathrm{H}}_{3}$...

We study intrinsic noise of current in a superconducting single-electron transistor, taking into account both coherence effects and Coulomb interaction near Cooper pair resonance. Because this interplay, the statistics tunneling events deviates from Poisson distribution and, more important, it shows even-odd asymmetry transmitted charge. The zero-frequency is suppressed significantly when quasiparticle rates are comparable to coherent oscillation frequency pairs.

We analyze charge tunneling statistics and current noise in a superconducting single-electron transistor regime where the Josephson-quasiparticle cycle is dominant mechanism of transport. Due to interplay between Coulomb blockade Josephson coherence, probability distribution for events strongly deviates from Poissonian displays pronounced even--odd asymmetry number transmitted charges. The charging coherence reflected also zero-frequency which significantly quenched when quasi-particle rates...