Industrial Potentiality of Alluvial Clays Deposits from Cameroon: Influence of Lateritic Clayey Admixture for Fired Bricks Production
The cartography and characterization of an alluvial clay deposit from Ebebda (Central region of Cameroon) were carried out in order to assess its suitability for the production of fired clay bricks. The clayey area investigated is ~ 50,000 m2 with an average thickness of the exploitable layer of 2.2 m, suggesting a deposit of about ~2.2 × 105 tonnes of clay. Mineralogy, physico-chemical and thermal analyses as well as firing properties were performed on representative clay samples. Kaolinite and quartz are the major minerals associated to illite. Upon heating to 900℃ - 1200℃, the linear shrinkage varies from 1.5% to 15%, the water absorption from 1.5% to 24% and the bending strength from 2 to 12 MPa. The admixture of lateritic clays (widely available) at 50%, 60%, 70% and 80% allow to decrease the shrinkage and bending strength, and to increase the water absorption. Overall, properties were satisfying the requirement for fired brick with 70% of laterite in the mixture.
The sequence of phases
In Chapter IV we came to find the alternation of elaborative and integrative phases as the basic structure of the thought process. In the light of the organization and methodology of the thought process this means that the subject (player) periodically returns to more general problems, especially to the main problem. The structure of all thought processes in which a difficult problem must be dealt with is characterized by this alternation.
An Economic Analysis of Obesity in Europe: Health, Medical Care and Absenteeism Costs
Obesity is not only a health but also an economic phenomenon with potentially important direct and indirect economic costs that are unlikely to be fully internalized by the obese. In the US, obesity prevalence is the highest among OECD countries and the issue has long been the focus of policy debate and academic research. However, European obesity rates are rising and there is still a lack of economic analysis of the obesity phenomenon in Europe. This paper attempts to fill in this gap by using longitudinal micro-evidence from the European Community Household Panel to assess the importance of several costs of obesity in nine EU countries. The analysis provides nationally comparable estimates of the costs of obesity in terms of health, use of health care services and absenteeism.