Phase synchronization in an array of driven Josephson junctions

We consider an array of N Josephson junctions connected in parallel and explore the condition for chaotic synchronization. It is found that the outer junctions can be synchronized while they remain uncorrelated to the inner ones when an external biasing is applied. The stability of the solution is found out for the outer junctions in the synchronization manifold. Symmetry considerations lead to a situation wherein the inner junctions can synchronize for certain values of parameter. In the presence of a phase difference between the applied fields, all the junctions exhibit phase synchronization. It is also found that chaotic motion changes to periodic in the presence of phase differences.Comment: 13 pages, 6 figures, accepted for publication in "CHAOS

Dynamics of coupled Josephson junctions under the influence of applied fields

We investigate the effect of the phase difference of applied fields on the dynamics of mutually coupled Josephson junction. The system desynchronizes for any value of applied phase difference and the dynamics even changes from chaotic to periodic motion for some values of applied phase difference. We report that by keeping the value of phase difference as $\pi$, the system continues to be in periodic motion for a wide range of system parameter values which might be of great practical applications.Comment: 13 pages 13 figure

Phase effects on synchronization by dynamical relaying in delay-coupled systems

Synchronization in an array of mutually coupled systems with a finite time-delay in coupling is studied using Josephson junction as a model system. The sum of the transverse Lyapunov exponents is evaluated as a function of the parameters by linearizing the equation about the synchronization manifold. The dependence of synchronization on damping parameter, coupling constant and time-delay is studied numerically. The change in the dynamics of the system due to time-delay and phase difference between the applied fields is studied. The case where a small frequency detuning between the applied fields is also discussed.Comment: 14 pages, 8 figures, Accepted for publication in "CHAOS

Partisipasi Politik Masyarakat dalam Pemilihan Umum Kepala Daerah di Kabupaten Minahasa Selatan Tahun 2010 (Studi di Kecamatan Amurang Timur Kabupaten Minahasa Selatan)

Amandemen UUD 1945 telah berimplikasi luas terhadap sistem ketatanegaraan. Salahsatunya mengenai ketentuan yang menyangkut pemerintahan di tingkat daerah yaitu mengenaipemilihan kepala daerah. Amandemen UUD 1945 ini menghasilkan rumusan baru yangmengatur pemerintahan daerah terutama mengenai pemilihan kepala daerah. Rumusan tersebutterdapat dalam Pasal 18 ayat (4) UUD 1945 yaitu: “Gubernur, Bupati dan Walikota masingmasingsebagai kepala pemerintah daerah Provinsi, Kabupaten dan Kota dipilih secarademokratis”. Dalam Pasal 18 ayat (4) UUD 1945 ini mengandung arti bahwa pemilihan itu harusdilakukan secara demokratis, menjamin prinsip kedaulatan rakyat dan dipilih secara langsungoleh rakyat.Pemilukada pada hakekat tujuannya yakni untuk memunculkan partisipasi politikmasyarakat. Ironinya partisipasi politik masyarakat tersebut kerap muncul setelah terjadinyamobilisasi yang dilakukan kekuatan-kekuatan politik dengan pendekatan pragmatis melaluipraktek transaksional. Pemilukada yang dipandang sebagai momen Perubahan yang dinantikanmasyarakat ternyata tidak sesuai dengan apa yang diharapkan pemilih yakni terealisasinyadengan segera visi misi yang telah terpilih. Ketidak konsistenan para eksekutif daerah terhadapjanji-janji dimasa kampanye telah menciptakan keraguan masyarakat terhadap momenpemilukada sebagai alat Perubahan, sehingga memunculkan sikap pragmatis warga terhadap paracalon eksekutif di pemilukada selanjutnya. Akibatnya hampir keseluruhan partisipasi politikmasyarakat dimomen pemilukada hanya dapat terbangun melalui pendekatan transaksionalseperti praktik politik uang atau yang sering disebut dengan money politic

Faktor – Faktor yang Menentukan Sewa Tempat Tinggal pada Kawasan Ekonomi dan Pendidikan di Kota Palembang

The purpose of this paper is to analyze the influence Accessibility,Power Electric,Water Supply, Roominess, The Floor Level of Residential Rental in Economic Region and Education Region and the was difference between residential rental in economic and education region. Data used in this study are primary data obtained from interviews with respondents who guided the list of questions. analyze by using Ordinary Least Square (OLS). The result showed that variable of Power Electric, Water Supply and Roominess have significant effect to Residential Rental and then Accessibility and The Floor Level have not significant effect to Residential Rental in Economic Region and Education Region. Variable of Power Electric and The Floor Level have negative effect to Residential Rental. There is differences residential rental in Economic and Education Region. Residential rental in Education Region is greater than Economic Region

Effect of random interactions in spin baths on decoherence

We study the decoherence of a central spin 1/2 induced by a spin bath with intrabath interactions. Since we are interested in the cumulative effect of interaction and disorder, we study baths comprising Ising spins with random ferro- and antiferromagnetic interactions between the spins. Using the resolvent operator method which goes beyond the standard Born-Markov master equation approach, we show that, in the weak coupling regime, the decoherence of the central spin at all times is entirely determined by the local-field distribution or equivalently, the dynamical structure factor of the Ising bath. We present analytic results for the Ising spin chain bath at arbitrary temperature for different distributions of the intrabath interaction strengths. We find clear evidence of non-Markovian behavior in the low temperature regime. We also consider baths described by Ising models on higher-dimensional lattices. We find that interactions lead to a significant reduction of the decoherence. An important feature of interacting spinbaths is the saturation of the asymptotic Markovian decay rate at high temperatures, as opposed to the conventional Ohmic boson bath.Comment: 13 page

Creation and annihilation of fluxons in ac-driven semi-annular Josephson junction

The dynamical behavior of a fluxon in a semi-annular long Josephson junction in the presence of an ac-drive is studied. The non-uniformity due to the non uniform distribution of bias current is investigated. The oscillating potential is found to increase the depinning current. Finite difference method is used for numerical analysis and the response of the system to the ac-bias is studied. The creation and annihilation of fluxon is also demonstrated numerically for the first, second and third Zero-Field step cases.Comment: 10 pages 8 figure