We present first-principles calculations for stable and metastable geometries of various hydrogen-related configurations in p-type GaN, including isolated interstitial H as well as Mg-H and Be-H complexes. We also calculate the associated vibrational stretching and wagging modes, systematically including anharmonic contributions to the vibrational frequencies; the anharmonicity is large due to ...

This paper presents design of a defected ground structure coupled miniaturized dual-mode bandpass filter realized using a square patch. Two slots orthogonal to each other are cut on the patch to increase the path length of the fundamental mode while keeping the second mode current path almost unaffected. An inclined aperture cut on the ground plane right beneath the center of the patch is used ...

New CP observables in B 0 (t) → hyperon + antihyperon from parity violation in the sequential decay Abstract We consider the decay B 0 (t) → hyperon + antihyperon, followed by hyperon weak decay. We show that parity violation in the latter allows to reach new CP observables : not only Imλ f but also Reλ f can be measured. In the decay B 0 d (t) → Λ ¯ Λ (BR ∼ 10 −6), Λ → pπ − these observables r...

The normal modes have been calculated for structures having the dihedral angles of the four @-turns of insulin. Frequencies are predicted in the amide I region near 1652 and 1680 cm-’. The former overlaps the a-helix band at 1658 cm-l in the Raman spectrum, while the latter accounts for the hitherto unassignable band a t 1681 cm-’. Calculated amide I11 frequencies extend above 1300 cm-I, provid...

Increasing demands on circuits with low supply voltage and low power consumption lead to the realization of analogue circuits working in the current-mode. In this paper a new topology is presented of multifunctional frequency filter SIMO (Single Input Multiple Output) working the in currentmode. The proposed circuit is realized using four second-generation current conveyors and six passive elem...

We use input-output analysis to examine subsonic and supersonic turbulent jet noise. For a supersonic jet, the leading input-output mode closely resembles wavepackets resulting from the parabolized stability equations (PSE). For a subsonic jet, however, input-output analysis produces several sub-optimal modes with nearly the same gain as the leading input-output mode. The sub-optimal modes depe...

Standard normal mode analysis (NMA) method is able to calculate vibrational entropy of proteins, but it is computationally intensive, especially for large proteins. To evaluate vibrational entropy efficiently and accurately, we, here, propose computation schemes based on coarse-grained NMA methods. This can be achieved by rescaling coarse-grained results with a specific factor that is derived o...

A short-wave problem of reflection and radiation by an open end of a two-dimensional planar waveguide is studied. The incident mode is assumed to have frequency close to the cut-off. The problem is studied in the parabolic approximation. A recently developed approach based on the embedding formula and the “spectral” equation for the directivity of an edge Green’s function is applied to the prob...