Exponential decay of dispersion managed solitons for vanishing average dispersion

We show that any $L^2$ solution of the Gabitov-Turitsyn equation describing dispersion managed solitons decay exponentially in space and frequency domains. This confirms in the affirmative Lushnikov's conjecture of exponential decay of dispersion managed solitons.Comment: 15 pages, 1 figur

Geographical Embedding of Scale-Free Networks

A method for embedding graphs in Euclidean space is suggested. The method connects nodes to their geographically closest neighbors and economizes on the total physical length of links. The topological and geometrical properties of scale-free networks embedded by the suggested algorithm are studied both analytically and through simulations. Our findings indicate dramatic changes in the embedded networks, in comparison to their off-lattice counterparts, and call into question the applicability of off-lattice scale-free models to realistic, everyday-life networks

Hubungan Antara Psychological Well-being Dan Happiness Pada Remaja Di Pondok Pesantren

Penelitian ini bertujuan untuk menguji hubungan antara psychological well-being dengan happiness pada remaja di pondok pesantren. Metode penelitian yang digunakan dalam penelitian ini terdapatlah metode kuantitatif dan uji hipotesis dilakukan dengan teknik analisis korelasi bivariate. Sampel penelitian sebanyak 90 responden remaja di pondok pesantren di Depok. Pengambilan data dengan menggunakan skala psychological well-being, skala kebahagiaan umum, positive affect, negative affect dan satisfaction with life. Uji hipotesis dalam penelitian ini menggunakan teknik korelasi product moment. Dari hasil penelitian dapat disimpulkan bahwa terdapatnya korelasi yang positif antara psychological well-being dengan kebahagiaan umum, terdapatnya korelasi yang positif antara psychological well-being dengan positive affect, terdapatnya korelasi yang negatif antara psychological well-being dengan negative affect terdapatnya korelasi yang positif antara psychological well-being dengan satisfaction with life. Hasil uji hipotesis dalam penelitian ini diterima, artinya terdapat hubungan yang positif antara psychological well-being yang tinggi dan happiness yang tinggi

Spreading dynamics on spatially constrained complex brain networks

The study of dynamical systems defined on complex networks provides a natural framework with which to investigate myriad features of neural dynamics and has been widely undertaken. Typically, however, networks employed in theoretical studies bear little relation to the spatial embedding or connectivity of the neural networks that they attempt to replicate. Here, we employ detailed neuroimaging data to define a network whose spatial embedding represents accurately the folded structure of the cortical surface of a rat brain and investigate the propagation of activity over this network under simple spreading and connectivity rules. By comparison with standard network models with the same coarse statistics, we show that the cortical geometry influences profoundly the speed of propagation of activation through the network. Our conclusions are of high relevance to the theoretical modelling of epileptic seizure events and indicate that such studies which omit physiological network structure risk simplifying the dynamics in a potentially significant way

Topological phase transitions of random networks

To provide a phenomenological theory for the various interesting transitions in restructuring networks we employ a statistical mechanical approach with detailed balance satisfied for the transitions between topological states. This enables us to establish an equivalence between the equilibrium rewiring problem we consider and the dynamics of a lattice gas on the edge-dual graph of a fully connected network. By assigning energies to the different network topologies and defining the appropriate order parameters, we find a rich variety of topological phase transitions, defined as singular changes in the essential feature(s) of the global connectivity as a function of a parameter playing the role of the temperature. In the ``critical point'' scale-free networks can be recovered.Comment: 4 pages, 3 figures, submitted, corrected and added reference

Rancang Bangun Penghitung Jumlah Koloni Bakteri Berbasis Arduino Uno

Koloni bakteri merupakan sekumpulan dari bakteri-bakteri yang sama yang mengelompok menjadi satu dan membentuk suatu koloni-koloni. Untuk mengetahui pertumbuhan suatu bakteri dapat dilakukan dengan menghitung jumlah koloni bakteri. Perhitungan suatu koloni biasa dilakukan secara manual dengan menandai dan menghitung koloni bakteri yang ada pada cawan petri, perhitungan ini masih menggunakan daya ingat manusia sehingga dapat terjadi kesalahan dalam proses perhitungan. Untuk mempermudah perhitungan jumlah koloni bakteri digunakan alat yang biasa disebut Colony Counter. Pada alat Colony Counter, perhitungan jumlah koloni bakteri menggunakan arduino uno smd dengan  minimum sistem atmega 328 dan Probe sebagai penghitung koloni bakteri. Dengan adanya colony counter tersebut pengguna tinggal menandai koloni bakteri yang dihitung dengan menyentuhkan Probe pada media sampel, sehingga hasil perhitungan akan langsung ditampilkan di LCD. Dari hasil uji coba penghitungan pada 15 sampel alat colony counter dapat berfungsi dengan baik

ANALISAPENGARUH BEBAN TERHADAP EFISISENSI GENERATOR DI PLTG CNG JAKABARING

Untuk mengetahui nilai efisiensi generator dan rugi daya pada PLTG CNG Jakabaring, dilakukan analisa secara manual, analisaefisiensi generator dan rugi daya dilakukan dengan mengumpulkan data-data berupa daya dan arusbebanterpakai generator . Berdasarkan hasil analisa, efisiensi tertinggi pada PLTG CNG Jakabaring didapat saat beban puncak sebesar 99,7886%. Sedangkan efisiensi terendah didapat saat beban tertinggi sebesar99,7643%. Danhasil ANALISArugidayaterkecil pada saatbebanpuncakadalah0,03601MW dan rugidayaterbesar pada saatbebanpuncakadalah0,04323 MW. Efisiensi dan Rugidayasangatdipengaruhi oleh daya dan arusbeban yang terpakai. Semakintinggidaya dan arusbebanmakasemakintinggiefisiensi generator dan semakinkecilrugidaya pada generator

Monitoring the dynamic behaviors of the Bosporus Bridge by GPS during Eurasia Marathon

International audienceEngineering structures, like bridges, dams and towers are designed by considering temperature changes, earthquakes, wind, traffic and pedestrian loads. However, generally, it can not be estimated that these structures may be affected by special, complex and different loads. So it could not be known whether these loads are dangerous for the structure and what the response of the structures would be to these loads. Such a situation occurred on the Bosporus Bridge, which is one of the suspension bridges connecting the Asia and Europe continents, during the Eurasia Marathon on 2 October 2005, in which 75 000 pedestrians participated. Responses of the bridge to loads such as rhythmic running, pedestrian walking, vehicle passing during the marathon were observed by a real-time kinematic (RTK) Global Positioning System (GPS), with a 2.2-centimeter vertical accuracy. Observed responses were discussed in both time domain and frequency domain by using a time series analysis. High (0.1?1 Hz) and low frequencies (0.00036?0.01172 Hz) of observed bridge responses under 12 different loads which occur in different quantities, different types and different time intervals were calculated in the frequency domain. It was seen that the calculated high frequencies are similar, except for the frequencies of rhythmic running, which causes a continuously increasing vibration. Any negative response was not determined, because this rhythmic effect continued only for a short time. Also when the traffic load was effective, explicit changes in the bridge movements were determined. Finally, it was seen that bridge frequencies which were calculated from the observations and the finite element model were harmonious. But the 9th natural frequency value of the bridge under all loads, except rhythmic running could not be determined with observations