For the production of high performance multilayer systems optical monitoring is essential. Substantial progress was achieved by the introduction of direct monitoring on the rotating substrate holder. It is a complex task to develop a stable monitoring strategy for multilayers with a large number of layers and irregular thicknesses. The verification and improvement requires the feedback of more ...

Erosion and deposition rates estimated from the stratigraphic record frequently exhibit a power-law dependence on measurement interval. This dependence can result from a power-law distribution of stratigraphic hiatuses. By representing the stratigraphic filter as a stochastic process called a reverse ascending ladder, we describe a likely origin of power-law hiatuses, and thus, rate scaling. Wh...

The goal of this work is to predict reasonable lifetime of a filter used to remove debris (e.g. foreign particles and gels) from the melt stream of an extrusion process. We are developing models which incorporate nonNewtonian porous media flow through a medium whose porosity changes as debris accumulates. Boundary conditions are based on the assumption of constant flow rate and coupling with ot...

To reduce particulate matter (PM) in diesel exhaust gas, a diesel particulate filter (DPF) has been developed. The thermal durability of existing platinum catalyst-supported DPFs is inadequate. We are focusing on a non-catalytic after-treatment of silicon carbide (SiC) fibers with highly thermal durability. In this study, we simulated the processes of soot deposition and oxidation. Results show...

The primary aim of the study was to analyse the non-steady state of filtration for selected electrostatic filter materials designed for use in respiratory protective devices. The obtained results showed that the filtration process in electrostatic filters was dependent in the main on the following factors: type of the filter material, electrostatic field strength of the material, and the charge...

Abstract To access safe water, a facile and low-cost quaternary phosphonium salt-functionalized graphene filter (PYQP-G filter) was developed via pi-pi stacking interaction between perylene surface. We first synthesized new derivative with two QPS groups at its amide sides denoted as PYQP. Next, shellac used carbon source to coat the material onto surface of porous SiO 2 substrate in chemical v...

A stereo computer vision system as a thickness measurement device is introduced. The challenging task is to measure the thickness of dust deposits over the surface of a flexible cloth filter with a target resolution of 0.5mm per measurement in the filter plane and a depth resolution of up to 50μm. The total area to be measured is 100mm × 2500mm. There is practically no texture present on the du...

A new simplified method for particle size estimation of radioactive aerosols was proposed for air monitoring. It does not need any new instruments but a traditional aerosol sampling device with a multistage filter system. The method is based on the particle size dependency of penetration for air filter. Decontamination factor data measured in each filter stage is inversed to a size distribution...