The problems of the first-passage time (FPT) [1, 2] and the residence time (RT) [3] are very important issues in random walk theory. Moreover, several properties of diffusion and transport in disordered systems are based in this concepts. Here, we do not want to present a survey of the enormous literature in the field of mean firstpassage time (MFPT) and mean residence time (MRT) of random walk...

Abstract Purpose In continuous manufacturing (CM), the material traceability and process dynamics can be investigated by residence time distribution (RTD). Many of unit operations used in pharma industry were characterized dead time–dominated RTD. Even though feasible proper feedback control is one many advantages CM, its application challenging these cases. This study aims to develop a control...

Residence time is a critical factor in determining the size of an open face biofilter. Four test biofilters were constructed with media comprised of yard waste compost and brush chips to compare 8 s. and 4 s. residence time. Biofilter performance was monitored for ten months by measuring pressure drop, moisture content, odor threshold, hydrogen sulfide, and ammonia concentrations. Odor reductio...

Nanopore sensing is a label-free method for characterizing water-soluble molecules. The ability to accurately identify and characterize an analyte depends on the residence time of the molecule within the pore. It is shown here that when a Au25(SG)18 metallic cluster is bound to an α-hemolysin (αHL) nanopore, the mean residence time of polyethylene glycol (PEG) within the pore is increased by ov...

Variability of residence time in the Tropical Tropopause Layer during Northern Hemisphere winter K. Krüger, S. Tegtmeier, and M. Rex Leibniz-Institute for Marine Sciences at Kiel University (IFM-GEOMAR), Kiel, Germany Environment Canada, Toronto, Canada Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany Received: 18 April 2009 – Accepted: 15 May 2009 – Published: 28 May 20...