Abstract Dielectric barrier discharges are an emerging technology for the plasma-catalytic removal of volatile organic compounds and other gas purification challenges such as O 2 traces from H . Packed-bed reactors mainly used these applications, but surface dielectric (SDBDs) typically printed on thin plates promising alternatives treatment large volumetric flow rates due to their low resistan...

Understanding the mechanism of positive leader discharge is important in lightning protection engineering and external insulation design high voltage power transmission systems. During propagation a leader, some processes without light-emitting, for example, recovery process after breakdown, cannot be observed by optical photography techniques. With combination digital high-speed imaging system...

The natural smoke exhaust system for tall spaces is more advantageous than the mechanical type of exhaust. In Taiwan, the effectiveness of natural smoke exhaust systems is inspected only by checking the vent area size. However, the air flow field in a tall space is very complicated, both at ordinary times or during fires. This study used Schlieren Photography technique, on the principle that li...

Recent laboratory methods developed to generate and to analyze internal waves have revealed important insights that sometimes guide and sometimes challenge theoretical predictions and the results of numerical simulations. Here we focus upon observations of internal waves generated by oscillatory or uniform flow over a solid boundary in a continuously stratified fluid. In the laboratory such flo...

Various infectious agents are known to be transmitted naturally via respiratory aerosols produced by infected patients. Such aerosols may be produced during normal activities by breathing, talking, coughing and sneezing. The schlieren optical method, previously applied mostly in engineering and physics, can be effectively used here to visualize airflows around human subjects in such indoor situ...

Schlieren visualization is one of the simplest ways of determining the geometric parameters of an ultrasonic beam generated by diagnostic transducers, and is recommended for evaluating the potential and the limitations of ultrasonic equipment used in diagnostic applications.’ Apart from some special cases, for example, dynamically focused and/or scanned receiving arrays, the shape of the transm...