Seawater ultrafi ltration (UF) as a pretreatment of reverse osmosis (RO) process in a thermal power plant was investigated using a 100 kDa hollow fi ber membrane. The choice of the UF physical backwash conditions remains arbitrary or ensuing from a sensibility study. As the optimum must take into account the factors interactions, we led a response surface study to analy...

Membrane ltration processes are often operated cyclically, where one cycle comprises a ltration and a backwashing phase. Due to the complex mechanisms involved, these ltration processes are mostly operated with xed values of the manipulated variables. In this paper, a model-based process control approach is introduced, which is based upon run-to-run control theory. To evaluate the controller, a...

We establish the existence of Adams operations on the members of a ltration of K-theory which is deened using products of projective lines. We also show that this ltration induces the gamma ltration on the rational K-groups of a smooth variety over a eld of characteristic zero.

A. Boczkowska, P. Chabera, Warsaw University of Technology, Faculty of Materials Science and Engineering, Warsaw, Poland A. J. Dolata, M. Dyzia, Silesian University of Technology, Faculty of Materials Science and Metallurgy, Katowice, Poland A. Oziębło, Institute of Ceramics and Construction Materials, Katowice, Poland A pressure-vacuum infi ltration (T = 720 oC, p = 15 MPa, t = 15 min) and gas...

Zirconia ultrafiltration membranes are widely developed and used for past several years. But the conventional sol-gel methods of zirconia membrane preparation involve many steps. In the present study an attempt was made to develop defect free zirconia ultrafiltration (UF) membrane in single step coating of zirconia nanopowder suspension by slip casting method over multichannel ceramic support. ...

Objectives: Modi®ed ultra®ltration increases blood pressure and cardiac index following open-heart surgery in children, but it is unclear if this is secondary to an improvement in global left ventricular function. A previous report has suggested that left ventricular systolic function as assessed in a single chord is improved by ultra®ltration (Davies MJ, Nguyen K, Gaynor JW, Elliott MJ. Modi®e...

background: apical leakage assessment is a way to compare the effi ciency of a fi lling material to seal the apical region of the tooth. many microleakage testing techniques have been introduced through the years, but there has been no agreement as to which technique gives the most accurate results. the aim of this study was to compare the accuracy of fl uid fi ltration and bacterial leakage te...

S. Golak, R. Zagorski Silesian University of Technology, Faculty of Materials Engineering and Metallurgy, Katowice, Poland Electromagnetic buoyancy force causes the mo vement of nonconducive par ticles in a c onducting liquid under electromagnetic fi eld. The phenomenon allows fi ltration of small inclusions from molten metals. This paper presents a mathematical model of the fi ltration process...

The in ltration process is generally described by a nonlinear di erential equation, which can be solved by iteration methods such as a Newton-Raphson method. In this paper we propose a Discrete Event System Speci cation(DEVS) model for Green-Ampt in ltration. We show that this model can be approximated using Genetic Algorithm optimization of a fuzzy system. The fuzzy approximation is shown to b...

In this thesis, we study Gaussian processes generated by certain linear transformations of two Gaussian martingales. This class of transformations is motivated by nancial equilibrium models with heterogeneous information. In Chapter 2 we derive the canonical decomposition of such processes, which are constructed in an enlarged ltration, as semimartingales in their own ltration. The resulting dr...