Estimating a Signal In the Presence of an Unknown Background

We describe a method for fitting distributions to data which only requires knowledge of the parametric form of either the signal or the background but not both. The unknown distribution is fit using a non-parametric kernel density estimator. The method returns parameter estimates as well as errors on those estimates. Simulation studies show that these estimates are unbiased and that the errors are correct

Time and energy-resolved two photon-photoemission of the Cu(100) and Cu(111) metal surfaces

We present calculations on energy- and time-resolved two-photon photoemission spectra of images states in Cu(100) and Cu(111) surfaces. The surface is modeled by a 1D effective potential and the states are propagated within a real-space, real-time method. To obtain the energy resolved spectra we employ a geometrical approach based on a subdivision of space into two regions. We treat electronic inelastic effects by taking into account the scattering rates calculated within a GW scheme. To get further insight into the decaying mechanism we have also studied the effect of the variation of the classical Hartree potential during the excitation. This effect turns out to be small.Comment: 11 pages, 7 figure

The underpotential deposition that should not be : Cu(1x1) on Au(111)

Peer reviewedPostprin

Condensation transitions in a model for a directed network with weighted links

An exactly solvable model for the rewiring dynamics of weighted, directed networks is introduced. Simulations indicate that the model exhibits two types of condensation: (i) a phase in which, for each node, a finite fraction of its total out-strength condenses onto a single link; (ii) a phase in which a finite fraction of the total weight in the system is directed into a single node. A virtue of the model is that its dynamics can be mapped onto those of a zero-range process with many species of interacting particles -- an exactly solvable model of particles hopping between the sites of a lattice. This mapping, which is described in detail, guides the analysis of the steady state of the network model and leads to theoretical predictions for the conditions under which the different types of condensation may be observed. A further advantage of the mapping is that, by exploiting what is known about exactly solvable generalisations of the zero-range process, one can infer a number of generalisations of the network model and dynamics which remain exactly solvable.Comment: 23 pages, 8 figure

Kajian Yuridis Tentang Pemalsuan Ijazah Menurut Pasal 263 dan 264 Kuhp

Penelitian ini dilakukan dengan tujuan untuk mengetahui bagaimana pandangan yuridis terhadap kepemilikan ijazah palsu dan bagaimana pertanggungan jawab pidana terhadap pemalsuan ijazah. Dengan menggunakan metode penelitian yuridis normatif disimpulkan: 1. Masalah ijazah palsu serta masalah ijazah Aspal (asli tapi palsu) adalah merupakan tindak pidana yang memenuhi formulasi ketentuan pasal 263 KUHP dan pasal 264 KUHP, tindakan administratif mana adalah merupakan kejahatan terhadap kepentingan umum, karena dapat menimbulkan suatu hak, maka kepada sipemalsu dan sipemakai maupun terhadap oknum-oknum yang terlibat dalam pembuatan ijazah palsu itu dapat dituntut dengan pasal 263 KUHP maupun pasal 264 KUHP. Masalah pemalsuan ijazah yaitu bagi mereka-mereka yang terlibat, apakah sipelaku atau sipemakai sudah tahu sebelumnya akibat hukum yang akan terjadi kemudian sehingga sudah barang tentu pertanggung jawaban baik secara psikis maupun batiniah harus dipikul oleh mereka karena secara langsung sudah dianggap bahwa mereka mampu bertanggung jawab

Power Spectra in a Zero-Range Process on a Ring: Total Occupation Number in a Segment

We study the dynamics of density fluctuations in the steady state of a non-equilibrium system, the Zero-Range Process on a ring lattice. Measuring the time series of the total number of particles in a \emph{segment} of the lattice, we find remarkable structures in the associated power spectra, namely, two distinct components of damped-oscillations. The essential origin of both components is shown in a simple pedagogical model. Using a more sophisticated theory, with an effective drift-diffusion equation governing the stochastic evolution of the local particle density, we provide reasonably good fits to the simulation results. The effects of altering various parameters are explored in detail. Avenues for improving this theory and deeper understanding of the role of particle interactions are indicated.Comment: 21 pages, 15 figure