Inconsistent conclusions are obtained from recent active galactic nuclei (AGNs) accretion disk inter-band time-lag measurements. While some works show that the measured time lags significantly larger (by a factor of $\sim 3$) than theoretical predictions Shakura \& Sunyaev (SSD) model, others find measurements consistent with (or only slightly than) SSD model. These conflicting observational re...

Our species exhibits spectacular success due to cumulative culture. While cognitive evolution of social learning mechanisms may be partially responsible for adaptive human culture, features of early human social structure may also play a role by increasing the number potential models from which to learn innovations. We present interview data on interactions between same-sex adult dyads of Ache ...

Transitions between valence subbands resulting from hole-hole scattering in cubic semiconductors have been analyzed in the frame of Coulomb interaction of valence electrons in the Luttinger-Kohn representation. Expressions for transition rates are derived. Calculated rates for transitions between lightand heavy-hole bands are presented for germanium. Hole-hole scattering has remarkably differen...

The screened electron-electron interaction in a multi-band electron system is calculated within the random phase approximation and in the tight-binding representation. The obtained dielectric matrix contains, beside the usual site-site correlations, also the site-bond and bond-bond correlations, and thus includes all physically relevant polarization processes. The arguments are given that the b...

Hyperspectral imaging has been widely studied in many applications; this type of sensors is imaging spectrometry sensors, which divide the waveband into hundreds of contiguous narrow bands for analysis. These images provide much richer and finer spectral information than traditional multispectral images do. Hyperspectral satellite images require enormous amounts of data space. NASA's satellite ...

The inter-band tunnel transistor (TFET) architecture features a subkT/q sub-threshold slope operation and can potentially support high ION/IOFF ratios over small gate voltages. Based on twodimensional numerical simulations, we investigate TFET in various material systems ranging from silicon to indium arsenide. TFET performance can be enhanced when heterojunctions are employed at the source sid...

In order to reduce the effect of Inter Symbol Interference (ISI) in a digital communication system, different types of transmitting pulse shaping filters have been extensively used in practice. We need to design these filters with some constraints imposed by requirements of the communication system in which we are going to use them. The use of optimization techniques have been proved to be quit...

The design of an optimized near-perfect reconstruction (NPR) type trans-multiplexer has been proposed. Cosine modulation has been used to design the synthesis and analysis sections of the trans-multiplexer. The design of transmultiplexer was reduced to design of single low-pass prototype FIR filter which is designed using variable window function (Kaiser, Cosh and DolphChebyshev). An unconstrai...