We consider an inverse elastic scattering problem of simultaneously reconstructing a rigid obstacle and the excitation sources using near-field measurements. Specifically, we are concerned with bounded embedded in unbounded, homogeneous, isotropic medium. The is illuminated by time-harmonic incident field generated each point source single given frequency, measurements total along entire circul...

The Penning ion source serving the ISIS Pulsed Spallation Neutron and Muon facility routinely delivers 55 mA beam of negative hydrogen ions (H?) in 250 µs pulses at 50 Hz repetition rate. Front End Test Stand (FETS) specifications require 60 mA, 2 ms, Hz. Extending discharge pulse length to 2.2 ms will need overcome observed current droop caused by thermal transients long operation. Recent expe...

Shadows provide a strong source of information about the shapes of surfaces. We analyze the local geometric structure of shadow contours on piecewise smooth surfaces. Particular attention is paid to intrinsic shadows on a surface: that is, shadows created on a surface by the surface's own shape and placement relative to a light source. Intrinsic shadow contours provide useful information about ...

in this work, we report synthesis of silver nanoplates by a simple reduction process of silver nitrate in the presence of polyvinyl alcohol (pva) and n,n'-dimethyl formamide (dmf). the characterization of the samples were carried out using x-ray diffraction (xrd), transmission-electron microscopy (tem) and uv-vis spectroscopy. absorption spectra of the nanoplates in comparison with that of...

Defocusing effects in modulation transfer function (MTF) measurement of charge coupled device (CCD) cameras is the main focus of current paper. We introduce measuring Point-spread function (PSF) in order to calculate the MTF and further more we will study the shape of MTF and its cut-off frequency by adjusting the lens focusing in different locations. A collimated white light LED by broadband s...