No abstract

Soil, the one of the main components of the environment, is constantly subjected to the action of pollutants existing both in air and water from rainfall and also in groundwater. Soil pollution recorded in the current stage varying degrees of contamination in relation to the demands manifested, chemical contamination occupying a preferential place being pronounced across the globe, regardless of zone. In view of the above purposes, the paper aims to highlight the impact of industrial processing of oil activity on soil quality, near a chemical plant in Constanta County.

Compressive strength of the polymeric composites is an important data for design of composite structures and therefore a depth study of this mechanical property is imperative. The mechanical properties of the polymer composites vary in the very large ranges according to the characteristics of the constituents, to their proportions and many other factors. Compressive property and failure mechanism of polymer composite materials reinforced with glass fiber were investigated in this paper. The experimental data for the studied materials were included the compressive strength, strain, poisson�s ratio and modulus. Some of these experimental values could be affected by aberrant errors. This paper also presents an application that removes the experimental data affected by gross errors from the sample of numerical values. The elimination of experimental data affected by gross errors is based on Chauvenet criterion.

Industry-standard TCAD software packages are widely used by semiconductor companies to optimise processes and devices in integrated circuits fabrication. After process and device simulation one can go ahead with circuit simulation using Spice. This paper focuses on the matching of these program packages in the area of parameter and characteristics extraction. We compared the transfer characteristics of n-type MOSFET, biased in the linear region, obtained from Synopsys package including TSUPREM4 and MEDICI with transfer characteristics from PSpice package.

3D printed specimens (ASTM D638 Type I) were manufactured from ABS and ASA material via additive manufacturing through material extrusion 3D printing (ME3DP). During manufacturing, the printing process has been paused, pre-impregnated biaxial or uniaxial glass fiber mesh has been placed onto the ABS/ASA substrate and then the printing process has been resumed. The obtained composite specimens have been subjected to tensile strength testing and results have been compared to those of specimens printed from homogenous material. The influence of raster angle, glass fiber direction and mesh density on resulting toughness has also been analyzed. It was found that inserting uniaxial glass fiber increases toughness of specimens in the axial direction, with a drop in layer adhesion if biaxial fiber is used. Test specimens manufactured with 30 uniaxial fiber strands embedded in a 0o raster angle 3D printed thermoplastic matrix match mechanical characteristics of injection-molded parts. The maximum mesh density without leading to delamination is one layer of glass fiber every two layers of thermoplastic matrix.