Accuracy in residence time measurements

The residence time equation

0009-2614/$ see front matter 2010 Elsevier B.V. A doi:10.1016/j.cplett.2010.08.019 * Fax: +972 2 651 3742. E-mail address: [email protected] The residence time of a diffusing particle in a prescribed spatial region recently finds an increasing number of applications in physics and chemistry. A partial differential equation for the residence time moments is derived, as a generalization of the ...

Comparison of Biofilter Residence Time

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...

Accuracy and precision of measurements obtained from conventional cephalograms and CBCT scan in orthodontics linear diagnostic measurements

Background and Purpose:  Due to the important role of imaging in the diagnosis and treatment plan in orthodontics, CBCT (Cone Beam Computed Tomography) images because of their three-dimensional nature, can minimize the disadvantages of two-dimensional images such as magnification, distortion, or superimposition. The purpose of this study was to evaluate the accuracy of conventional cephalograms...

Variability of TTL residence time

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...

Limits and Accuracy in Measurements