Highly purified preparations of Hageman factor, a potent clotpromoting agent in normal mammalian plasma, had a sedimentation coefficient of approximately 5S before activation. After activation, the Hageman factor behaved as a much less soluble or larger molecule during ultracentrifugation and gel filtration. No significant change in sedimentation behavior was noted when the Hageman factor in pl...

Paradigmatic examples are the classical Stefan problem and more general models of phase transitions, where the free boundary is the moving interface between phases. Other examples come from problems in surface science, plastic molding and glass rolling, filtration through porous media, where free boundaries occur as fronts between saturated and unsaturated regions, and others from reaction-diff...

Invited Papers Preconditioners for Mixed FEM Solution of Stationary and Nonstationary Porous Media Flow Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Owe Axelsson, Radim Blaheta, and Tomáš Luber Fast Constrained Image Segmentation Using Optimal Spanning Trees . . . . . . 15 Stanislav Harizanov, Svetozar Margenov, and Ludmil Zikatanov On Computer Simulation of Fl...

A population balance model is formulated for transport of stable particulate suspensions in porous media. Equations for particle and pore size distributions were derived from the stochastic Master equation. The model accounts for particle flow reduction due to restriction for large particles to move through small pores. An analytical solution for low particle concentration is obtained for gener...

Lignin is a valuable biomaterial. It is both naturally abundant and readily available as a byproduct of the pulping processes, and the proper reprocessing of lignin is an effective way to achieve waste recovery. Lignin fiber mats with web structures can be produced using electrospinning techniques. Such fiber mats are a promising material for use in the production of filter products. This study...

Random urine samples from hospitalized patients (n = 550) and seeded sterile filtered urine samples (n = 730) were used to test a membrane filtration technique, Qualture (Future Medical Technologies International, Inc., West Palm Beach, Fla.), for the detection and identification of uropathogens. Results for each sample were compared with those obtained by the calibrated loop (0.01 ml) method t...

The purpose of this paper is an experimental and model assisted investigation of the capabilities of a dewatering system for sewage sludge for decentralised sites. Laboratory and field tests are performed with different initial conditions and the influences of filter medium, initial height, initial total suspended solids, temperature and relative humidity are discussed. The experimental work sh...

Rapid assays for foodborne pathogens currently require an enrichment step to bridge the gap between the detection limit of interest (1 cfu/g or less) and the detection limits of available assay systems (100–100,000 cfu/mL). Although filtration can potentially separate and concentrate bacterial pathogens to detectable levels if large (100–1,000 mL) sample volumes are processed, prior filtration ...

Water shortage is an immediate and serious threat to our world population. Inexpensive and scalable methods to clean freshwater and wastewater are in high demand. Nanofiber filtration membranes represent a next generation nonwoven filter media due to their unique properties. Polyethlyene terephthalate (PET) is often used in the packaging of water and other commonly used materials, leading to a ...