Egis sponsorship presentation

Papers presented virtually at the 41st International Southern African Transport Conference on 10-13 July 2064Egis is an international company active across the entire asset transport lifecycle - from consulting and construction engineering, operation & maintenance, concessions and mobility services and asset management, operating in 120 countries and 16,000 employees. Egis manages worldwide 28 road, bridges and tunnel operation companies, 20 airports and over 40 on-street smart parkings. In Africa, Egis is the largest private road operator with a network of close to 2,000km, 4 airports and ranks amongst the 7th largest engineering company in transport

Avaliação da atividade antimicrobiana de extrato aquoso e etanólico de Acanthospermum australe.

As plantas medicinais têm sido amplamente empregadas na terapia de diversas patologias, constituindo parte das ferramentas terapêuticas utilizadas no controle das mais variadas moléstias humanas. A atividade antibacteriana dos extratos aquoso e etanólico de Acanthospermum australe (Loefl.) O. Kuntze foi avaliada frente às bactérias Staphylococcus aureus (ATCC 6538P) e Escherichia coli (ATCC 25922), pelo método de difusão em Agar. Foi observada a inibição de crescimento destes microrganismos por ambos os extratos, nas concentrações testadas. Paralelamente, foi realizada a análise fitoquímica dos extratos aquoso e hidroetanólico para a determinação de compostos fenólicos (taninos, flavonoides, ácidos fenólicos e antraquinonas), alcaloides e compostos terpênicos. Os extratos apresentaram perfis qualitativamente semelhantes, apresentando taninos, flavonoides, ácidos fenólicos e compostos terpênicos

Determination of the composition of homogeneous light element binary compounds using charged particle induced nuclear reactions

International audienceIn this paper we describe the application of nuclear reactions induced by charged particles for the instrumental analysis of homogeneous binary compounds. The principle of a very accurate method of calibration, the "average stopping power" method, is given. The overall accuracy of the analytical results is discussed, and examples of analysis are given

Characterization of boron carbide thin films fabricated by plasma enhanced chemical vapor deposition from boranes

We have fabricated boron carbide thin films on Si(111) and other substrates by plasma-enhanced chemical-vapor deposition (PECVD). The PECVD of boron carbides from nido-cage boranes, specially nido-pentaborane(9) (B5H9), and methane ( CH4) is demonstrated. The band gap is closely correlated with the boron to carbon ratio and can range from 0.77 to 1.80 eV and is consistent with the thermal activation barrier of 1.25 eV for conductivity. We have made boron carbide by PECVD from pentaborane and methane that is sufficiently isotropic to obtain resistivities as large as 1010 Ω cm at room temperature. This material is also shown to be suitable for photoactive p-n heterojunction diode fabrication in combination with Si( 111)