We investigate the effect of a radial pressure bump in a protoplanetary disk on planetesimal formation. We performed the two-dimensional numerical simulation of the dynamical interaction of solid particles and gas with an initially defined pressure bump under the assumption of axisymmetry. The aim of this work is to elucidate the effects of the stellar vertical gravity that were omitted in a pr...

Low resolution IUE data obtained towards HD 62542, a B5 V star in a line of sight associated with a dark cloud in the Gum Nebula region near & Pup (OS Iaf) and y Vel (WC8 + 09 I), yields an extinction curve with an extremely broad and weak W extinction bump and the highest far-UV extinction yet obseaved in the Milky Way, reaching a value of E(1200-V)/E(B-v)p115. The weak bump is very similar to...

The aim of this study was to determine, using a computerized image analysing system, whether the use of a curved-bristle toothbrush (CBT) alone is more effective than two other toothbrushing protocols on dental plaque elimination in poor-toothbrushing orthodontic patients. The labial surfaces of the maxillary canine-to-canine anterior teeth of 30 patients (12 males and 18 females) were individu...

We present a method for developing fully scalable lumped element models for flip chip interconnects. Measurements of test structures and full wave simulations are used to generate circuit models for various single bump configurations. Furthermore, regression models are developed for scaling the values of the elements with the physical attributes of the circuit. First, the method is validated us...

Spatial patterns of neuronal activity arise in a variety of experimental studies. Previous theoretical work has demonstrated that a synaptic architecture featuring recurrent excitation and long-range inhibition can support sustained, spatially patterned solutions in integrodifferential equation models for activity in neuronal populations. However, this architecture is absent in some areas of th...

Abstract We investigate the amplification of curvature perturbations in a two-field inflation model featuring Gaussian potential bump. When inflaton encounters bump along inflationary trajectory, its rolling speed is generally reduced, potentially causing violation slow-roll condition. Consequently, original decaying modes comoving during phase start growing, and lead to enhanced small-scale de...

After reviewing several physiological findings on oscillations in the electroencephalogram (EEG) and their possible explanations by dynamical modeling, we present neural networks consisting of leaky integrator units as an universal paradigm for neural and cognitive modeling. In contrast to standard recurrent neural networks, leaky integrator units are described by ordinary differential equation...

This paper represents a method to improve the SNR and linearity of an integrator by feedback compensation technique. The discussed design reduces signal swing while keeping advantages of both feed-forward as well as feedback topology without changing the signal transfer function. SNR and linearity are related to the output of an integrator. Reduced SNR and non-linearity resulted because of the ...

We present alternative ways of looking at vector elds that complement existing ow visualization methods. These techniques are based on bump mapping and are simple, easy to compute and fast to render. For example, in one of the techniques a surface from the vector eld is extracted and the directions of the vector values on the surface are normalized and used as surface normals. The shading of th...