Streamers are ionization waves in gas discharge devices, modelled here as travelling wave solutions of a drift-diiusion model for the transport of electrons and ions. The existence of a certain type of small amplitude streamers is proved by applying results from the theory of singularly perturbed ordinary diierential equations. Global information is obtained from a large activation energy analy...

The polar filaments within microsporidian spores discharges as tubes with subsecond velocity. Populations of discharging tubes of Glugea hertwigi spores pulse-labeled with latex particles for 1-3 s were consistently devoid of label at the distal ends; discharging tubes were completely labeled after 30- to 60-s exposure to latex. This experiment indicates that discharge tubes grow at the tip. Co...

Periodic gas oscillations in a closed tube are investigated experimentally and numerically. At resonance, these oscillations are accompanied by shock waves traveling back and forth along the tube. Gas temperature and pressure measurements are reported. It is found that the gas temperature changes substantially along the tube. A two-dimensional numerical model of turbulent gas oscillations is fo...

OBJECTIVES In fast-track pulmonary resections, we removed chest tubes after video-assisted thoracic surgery (VATS) lobectomy with serous fluid production up to 500 ml/day. Subsequently, we evaluated the frequency of recurrent pleural effusions requiring reintervention. METHODS Data from 622 consecutive patients undergoing VATS lobectomy from January 2009 to December 2011 were registered prosp...

The pulsed dc discharge was produced in a 13 mm X 15 mm quartz tube of 75-cm length by passing a current ranging from 10 ma to 1200 ma through the tube for approx-1 imately 500 f.sec at a repetition rate of 200 sec. Helium pressures of 0.03-2.0 mm Hg were used in the experiments. Part of the discharge tube length was contained inside a 1 in. X 2 in. waveguide in such a manner that the tube and ...

A dissolved methane sensor based on silicone tube was designed, constructed and optimized.The silicone tube diameter, silicone tube length and helium flow rate (as the carrier gas(were considered as process parameters to be optimized.A continuous stream of helium (50 mL/min) was directed through the tubing, sweeping out the...

STUDY OBJECTIVES Previous articles have promoted the early use of thoracotomy and decortication for refractory empyema. This study examines thoracoscopy and decortication at the time of initial chest tube placement in pediatric patients with parapneumonic empyema. DESIGN We reviewed the medical records of 16 consecutive patients who were children with parapneumonic empyema. RESULTS Thirteen...