The foam generated by the mixture of air and water has a much higher viscosity and lower mobility than those of pure water or gas that constitutes the air-water foam. The possibility of using the air-water foam as a flow barrier for the purpose of groundwater and soil remediation is explored in this paper. A nanoparticle-stabilized air-water foam was fabricated by vigorously stirring the nano-f...

In the collection zone of a flotation column, the air holdup is known to be relatively constant along the column height. The effect of the decrease in hydrostatic pressure with height may need to be taken into consideration, particularly for tall industrial columns. However, this phenomenon is readily ascertained. On the other hand, the changes at the pulp-froth interface, as well as the air fr...

High purity distillation columns are critical unit operations in cryogenic air separation plants. The development of nonlinear control technology is motivated by the need to frequently change production rates in response to time varying utility costs. Detailed column models based on stage-by-stage balance equations are too complex to be incorporated directly into optimization-based strategies s...

Carbon monoxide (CO) is an important atmospheric air pollutant and a good knowledge of its global and regional distribution is of much interest, e.g., for air quality applications. SCIAMACHY on ENVISAT is currently the only satellite instrument that can measure the vertical column of CO with high sensitivity down to the Earth surface due to its nearinfrared channels and its nadir observation mo...

Remedial dredging of contaminated bed sediments in rivers and lakes results in the suspension of sediment solids in the water column, which can potentially be a source for evaporation of hydrophobic organic compounds (HOCs) associated with the sediment solids. Laboratory experiments were conducted in an oscillating grid chamber to simulate the suspension of contaminated sediments and flux to ai...

INTRODUCTION Although cuff leak test has been proposed as a simple method of predicting the occurrence of postextubation stridor, cut-off point of cuff-leak volume substantially differs between previous studies. In addition, laryngeal ultrasonography including measurement of air column width could predict postextubation stridor. The aim of the present study was to evaluate the value of laryngea...

Physical differences, such as variations in geometry, between musical wind instruments of a given type generally lead to differences in their resonance properties and, consequently, in their playing characteristics. Input impedance measurements provide information about both the strengths and frequencies of the instrument’s air column resonances. In most playing situations, it is these air colu...

Abstract Background Cuff leak test (CLT) has been used widely to assess upper airway patency before extubation but with low positive predictive value. Aim To the diagnostic accuracy of column width ratio (ACWR) in predicting postextubation stridor (PES). Patients and methods 50 who intubated >24 hours were observed for reintubation. Laryngeal ultrasound was done measure ACW ETT cuff defl...