Delamination in a chimney, modelling and analysis

Abstract Non-destructive testing plays an important role in areas where security requirements are important, such as nuclear, automotive, aviation, rail and particularly in civil engineering structures. The used techniques are various: ultrasound, X-ray, infrared and the choice of a particular method depends on the structure geometry, the material nature and the required accuracy. In this range of methods, thermal non-destructive control based on infrared thermography has the advantage to be well suited to auscultation of large structures without any contact with them and the results can be exploited immediately without any prior treatment. In this work, we present the results of simulations on non-destructive thermal characterization of a wall chimney having internal defects in form of cracks. In this application, the model is based on the finite element method. The influence of the size, position and nature of defects in the wall chimney are studied

Oleuropein and Antibacterial Activities of Olea europaea L. Leaf Extract

In this study, we reported the determination of phenolic compounds in olive leaves by reversed phase HPLC/DAD and the evaluation of their in vitro activity against several microorganisms. These organisms might however, be causal agents of human intestinal and respiratory tract infections. Extract of the leaves of two varieties of Olea europaea L. (Chemlel and Dathier) was investigated for antibacterial activity against four pathogenic bacteria. Leaves extract was prepared using water and methanol (20/80) in a cold extraction process. The tested bacteria were Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa and Staphylococcus aureus .The extracts were found to be effective against all isolates tests. Ethanolic extract at a concentration of 100 % presented the highest potential of inhibiting variety of Dathier against S.aureus .This is with an inhibition zone of 17.49 mm and 15.66 mm for the variety Chemlel against S.aureus. The high Oleuropein content and the important antibacterial activities of olive leaves extract could be useful sources for industrial extraction and pharmacological application

Anticoagulant Activity of Some Ficus carica Varieties Extracts Grown in Algeria

The hemostatic system is a complex balanced system that triggers clot formation to prevent blood loss after trauma. To block abnormal bleeding and maintain intravascular blood in a liquid state, in this study we investigated the possible anticoagulant effect of leaves and fruits extracts from some fig varieties grown in Algeria by determining the quick time (QT). The blood samples of the healthy individuals were used. For in vitro coagulation assays, the clotting times obtained in the presence of polyphenols in different extracts of F.carica samples indicate that they exert a high anticoagulant activity on the exogenous pathway of coagulation. Moreover, the polyphenolic extract of ‘Roudane’ variety presented a substantial increase in coagulation. Based on these preliminary results, it can be suggested that the fig polyphenolic extracts (FPE) of this varieties have anticoagulant activity that could be useful in preventing blood clots