in order to evaluate the effectiveness of the iranian made charcoal tubes in the field , 60 local made and 60 imported ones (skc type) were randomly selected and placed side by side for sampling aromatic hydrocarbons (including benzene, toluene, xylene) in workers breathing zone in a paint factory. the results indicated that there were no statistically significant differences between the mean c...

This project aims to find correlations between various flow parameters and liquid refrigerant flow distribution within a horizontal manifold supplying two-phase R134a downward into fifteen aluminum microchannels. Liquid flow rates, system pressures, and refrigerant temperatures are recorded. Prior to this project, similar experiments were conducted using an identical manifold setup with water/a...

D. Simić, J. Tepić, V. Gajić, I. Kovačević, B. Lalić, Faculty of Technical Sciences, University of Novi Sad, Novi Sad, Serbia This paper discusses the distribution fl ow of aluminum (Al) alloy pipes, starting with the completion of the manufacturing process and fi nal inspection. The proposed solution considers the use of bar-coded caps produced from recycled polymer materials that are placed o...

Metal bending tube is widely used in industry while its forming defects extremely affect the quality. Among all defects, bending-inside wrinkling caused by non-uniform compressive stress a zero-tolerated defect, particularly when for transportation. However, current detection approach, suffering from lack of insight into mechanism, normally posteriori. To obtain priori condition certain go-to-b...

A severe plastic deformation process, termed accumulative extrusion bonding (AEB), is conceived to steady-state bond metals in the form of multilayered tubes. It shown that AEB can facilitate their solid-state, like process roll (ARB). The steps involve iterative extrusion, cutting, expanding, restacking, and annealing. As iterated, laminated structure layer thicknesses decrease within tube wal...

Hybrid nanostructured arrays based on carbon nanotubes (CNT) and palladium or titanium dioxide materials have been synthesized using self-supported and silicon-supported anodized aluminum oxide (AAO) as nanoporous template. It is well demonstrated that carbon nanotubes can be grown using these membranes and hydrocarbon precursors that decompose at temperatures closer to 600°C without the use of...

BACKGROUND AND AIMS Biocompatibility of root-end filling materials is a matter of debate. The aim of this study was to compare the biocompatibility of a variety of commercial ProRoot WMTA cements and a resin-based cement (Geristore®) with different pH values of setting reaction and different aluminum contents, implanted into the subcutaneous connective tissue of rats at various time intervals. ...

In order to reduce the impacts of industrial effluent on environment, silicon carbide hollow fiber membranes were prepared by precipitation-immersion technique and sintered at 1450 1500 °C. The characterized X-ray diffraction, their surface structure was scanning electron microscopy atomic force microscopy, pore size distribution porosity, mechanical properties, flow measurements with distilled...

In this paper, a new geometry has been proposed to increase heat transfer in tubes. The fluid used was water-aluminum oxide (Al2O3) nanofluid. results showed that the study (compared simple tube) addition increasing transfer, reduced flow pressure drop, which is great advantage over previous methods. Reynolds numbers of 2-300 and nanoparticle volume fraction 0-3.5% have investigated. Profile te...