Rotary ultrasonic machining (RUM) is a nontraditional drilling process. It has been used to drill not only brittle but also ductile materials. It was observed that the surface roughness of the drilled hole near the entrance side was better than that near the exit side. However, explanations about this observation could not be found in the literature. This paper aims to provide explanations abou...

At SHIPTRAP, exotic nuclei produced in fusion reactions and separated from the primary beam in the velocity filter SHIP are stopped in a gas-filled stopping cell. The ions are extracted, bunched and transferred to a double Penning trap system, where their masses can be measured. Contaminant ions created in the gas-filled stopping cell and abundantly produced reaction products different from the...

Some urban road tunnels serve as the main traffic access routes for residents in surrounding large communities. The congestion is a common phenomenon during rush hours inside this kind of tunnel. In order to learn about environmental parameters tunnel evening hour, comprehensive measurement typical commuting conducted. thermal environment and air pollutant distribution along are measured simult...

BACKGROUND Uterine artery embolization (UAE) is a minimally invasive procedure performed under fluoroscopy for the treatment of uterine fibroids and accompanied by radiation exposure. OBJECTIVES To compare ovarian radiation doses during uterine artery embolization (UAE) in patients using conventional digital subtraction angiography (DSA) with those using digital flat-panel technology. PATIE...

A simple derivation of the “edge radiation” emitted by an electron beam going through a bending magnet in the directions of its entrance and exit from the magnet itself is presented. This radiation is characterized by wavelengths much longer than the synchrotron radiation critical wavelength in the same magnet. The far field radiation emitted by an electron following a curved trajectory inside ...

A highly transient flow regime called riser slugging can develop in pipelines from wellheads to separation tanks which introduces severe oscillations of pressure and flow rates in off-shore processes. Mitigation of the intensity of riser slugging may be achieved via anticipative control actions on valves positioned at the entrance and at gas/oil exits of the separators. In Phase 1, this work is...