This paper describes a new approach to cathode-ray tube design aimed at achieving a significant depth reduction. The addressing function of the electron beam has been separated from the light generation process by a channel electron multiplier array, allowing the use of a novel deflection system based on a low-power scanning beam. Monochrome versions of the thin tube have been made with a 12" (...

We report an experimental study of femtosecond optically excited emission of terahertz frequency electromagnetic radiation from GaxIn1−xAs bulk crystals with alloy composition in the range between 0 x 0.65. The terahertz-emission mechanisms in bulk GaxIn1−xAs were studied as a function of carrier mobility, carrier concentrations, band gap as well as polycrystal grain size. Our experiments and a...

The design and analysis of a high-power wideband sheetbeam coupled-cavity traveling-wave tube operating at V-band is presented. The interaction circuit employs three-slot doubly periodic staggered-ladder coupled-cavity slow-wave structure, and a 5 : 1 aspectratio sheet electron beam is used to interact with the circuit. Combined with design of the well-matched input and output couplers, a 3-D p...

Langerhans cells (LCs) are the predominant antigen-presenting cells distributed in the mucosa of various organs with high antigenic exposure. They capture antigens, process and present them to the T lymphocytes. LCs are known to be present in the human female reproductive tract. Very few studies have demonstrated the presence of LCs in human uterine tubes. The aim of the present study was to de...

Current flow, considering a semiclassical electron–electric-field interaction and electron scattering by acoustic phonons, is studied in semiconducting zig-zag carbon nanotubes. The p-electronic band structure and the phonon spectrum of the nanotube are both calculated from graphene by the zone-folding method. Scattering rates are calculated using first-order perturbation theory and the deforma...

PURPOSE To design a rotating anode X-ray tube capable of operating in strong magnetic field environments. This tube design can be used in 'close proximity" hybrid X-ray/MR system geometries where the imaging fields of view are separated by only ∼1.2 meters. METHODS Existing rotating anode X-ray tube designs fail in strong magnetic field environments because the fields alter the electron traje...