We present high-resolution soft-X-ray spectra of the prototypical Seyfert 2 galaxy, NGC 1068, taken with the XMM-Newton Reflection Grating Spectrometer (RGS) and the Chandra Low Energy Transmission Grating Spectrometer (LETGS). Its rich emission-line spectrum is dominated by recombination in a warm plasma (bright, narrow radiative recombination continua provide the " smoking gun "), which is ph...

The hydrodynamic response of a land-based oscillating water column (OWC) wave energy converter under various irregular conditions is investigated numerically. Based on the potential flow theory, two-dimensional fully nonlinear numerical flume (NWF) developed to model characteristics using time-domain higher-order boundary element method (HOBEM). inner-domain sources and JONSWAP spectrum used ge...

The purpose of this paper is to introduce a different type of converter circuit used to drive switched reluctance motors. It continues with detailed discussion on the resonant converter armed at minimizing or eliminating the transistors switching losses. Finally the drive has been tested on a disc-type reluctance motor for the perfomance and functionality.

A novel graphical method of analysing continuous membrane separation systems has been developed. The method is applicable to all counterand co-current membrane modules – single-stage, cascades, and membrane columns. All configurations can be broken down into “column sections”, no matter how complex the arrangement. Each column section, which resembles a typical single-stage separator, is modell...

A fullerene graph F is a cubic 3-connected plane graph with exact 12 pentagons and other hexagons. Let M be a perfect matching of F . A cycle C of F is M -alternating if and only if the edges of C appear alternately in and off M . A set H of disjoint hexagons of F is called a resonant pattern if F has a perfect matching M such that all hexagons in H are M -alternating. A fullerene graph F is k-...

A connected graph is said to be k-cycle resonant if, for 16 t6 k, any t disjoint cycles in G are mutually resonant, that is, there is a perfect matching M of G such that each of the t cycles is an M -alternating cycle. The concept of k-cycle resonant graphs was introduced by the present authors in 1994. Some necessary and su6cient conditions for a graph to be k-cycle resonant were also given. I...

In this study, the validity of the approximation used in the modeling of resonant inverter tuning loop is discussed. With this approach, the phase-frequency relation of a resonant load around load resonant frequency can be expressed as a linear function for a reasonably high quality factor load. Results are verified by simulations.

In this paper, a numerical solution procedure is presented for the free and forced vibration of a piezoelectric nanowire under thermo-electro-mechanical loads based on the nonlocal elasticity theory within the framework of Timoshenko beam theory. The influences of surface piezoelectricity, surface elasticity and residual surface stress are taken into consideration. Using Hamilton’s principle, t...