A simple and selective new technique for atomic hydrogen flux measurements in a plasma environment is introduced demonstrated this work. This works by measuring the etching rate of an amorphous carbon film translating to incoming radical through well-defined etch yield per radical. Ions present have much higher than radicals do. For that reason, suppression ion toward crucial ensure observed do...

A series of devices have been investigated which use acoustic radiation forces to concentrate micron sized particles. These multi-layered resonators use a quarter-wavelength resonance in order to position an acoustic pressure node close to the top surface of a fluid layer such that particles migrate towards this surface. As flow-through devices, it is then possible to collect a concentrate of p...

A three-dimensional failure initiation criterion in brittle materials containing a sharp V-notch is presented and validated by experiments. It is based on simultaneous fulfilment of the stress requirement and a finite fracture mechanics energy release rate (ERR) requirement. Since the ERR cannot determine failure initiation direction for dominant mode III loading, the failure initiation orienta...

Microwave Non-Destructive Testing (NDT) techniques for dielectric coatings are vital processes in many industrial applications due to their superior defect detection capabilities over traditional NDT methods. However, the limited bandwidth and post-processing complexities of these cause them fall short accurately estimating delamination thickness such structures. In this paper, a novel low-comp...

Dielectric: materials commonly used as insulators in spark gaps (Lexan, Nylon, Lucite, Macor, Boron Nitride, Delrin and G-10) have been exposed to the by-products of arcs in three different spark gap experiments. The first was a 60 kV, 0.05 Caul/shot spark gap using copper-tungsten or graphite electrodes at various pressures of N2 or SF6 gas. The second was a 5-30 kV, 4-25 kA, .l-.6 Coul/shot, ...

In an inductively-coupled H2-Ar plasma at a total pressure of 1.5 Pa the influence of the electrode cover material on selected line intensities of H, H2, and Ar are determined by optical emission spectroscopy and actinometry for the electrode cover materials stainless steel, copper, tungsten, Macorr, and aluminum. Hydrogen dissociation degrees for the considered conditions are determined experi...

Comprehensive knowledge and understanding of the breakdown behavior solid-gas interfaces are important for development, optimization, coordination insulation in practical high-voltage (HV) gas-insulated systems (GISs) that widely used power pulsed industries. However, despite significant research efforts focused on characterization parameters properties complex gas-filled HV systems, basic mech...

With dramatic delivery, one of the newest American short story writers read two selec­ tions from her latest work, Black Tickets, last night in the Library Auditorium. Sensual in nature, both dealt with a char­ acter’s inner perception of life. Jayne Anne Phillips, at 26 critically acclaimed, spoke to an overflow crowd of 450, as the Sophomore Literary Festival continued. She opened with “ Home...

WASHINGTON (AP) Iranian oil exports apparently w ere choked off yesterday by a shutdown of the country’s only crude oil port. A U.S. official said the shutdown may have stem m ed from a strike by port workers. Initial reports came to adm inistration and congressional sources from the CIA. The reported shutdown at Iran ’s K harg Island came as the United States sought to negotiate the release of...

We report our preliminary findings on the use of a split-ring (I) or loop-gap resonator in electron spin echo (ESE) spectroscopy at 9 GHz. The loop-gap (LG) resonator of Froncisz and Hyde (2) was reported to have several features which could make it more advantageous than the overcoupled (3) TEro2 microwave cavity traditionally used in ESE experiments (4). Among these are the large uniform micr...