Preparation and characterization of natural rubber/silica nanocomposites using rule of similarity in latex

Rule of similarity and latex compounding techniques were combined for the first time to prepare natural rubber/nanosilica (NR/SiO2) nanocomposite with core-shell nanosilica-poly (methyl methacrylate) (SiO 2-PMMA) particles and PMMA-modified natural rubber matrix (NR-PMMA). The microstructure of SiO2 and nanocomposites with different SiO 2 contents was characterized by fourier transform infrared spectroscopy (FTIR); the morphology of nanocomposites was investigated with scanning electron microscopy (SEM); the tensile strength was characterized by tensile testing machine and the thermal stability of composites was studied by thermal gravimetric analysis. Results showed that PMMA chains have successfully grafted onto the surface of SiO2, and the core-shell SiO 2-PMMA nanoparticles and NR-PMMA latex have been perfectly incorporated. SiO2-PMMA nanoparticles are evenly distributed over the NR matrix with an average size in the range of 60-100 nm at the low content (SiO2? 3 wt%), while aggregations are apparently observed when 5 wt% SiO2 is loaded. In addition, NR/SiO2 composities possess a considerable improvement in ageing resistance compared with the pure NR. The tensile strength of composite increases from 6.99 to 12.72 MPa, reaching the highest value at a 0.5 wt% SiO2 loading, and then the figure decreases gradually because of the aggregation of SiO2 nanoparticles. It is anticipated that the reported process is to provide a simple and economic way for preparing NR composites.

The capacity of European higher educational institutions to address threats imposed by natural hazards

The main aim of this work was to investigate the availability and capacity of educational programmes at different levels at European Higher Educational Institutions (HEI) that are directly related to disaster resilience. This investigation was important since education in disaster resilience for citizens, communities, public administrators and decision makers is vital for improving preparedness, mitigation, resistance, absorption and recovery as a result of natural disasters. For this purpose, a study on the capacity of HEIs across Europe to address the threats imposed by natural hazards has been carried out. The study was performed by using a web-based survey tool which ran for 1 year with participants from 28 European countries. Findings of this work showed a great lack of educational programmes in disaster resilience across Europe. However, in recent years, there has been an increase in such programmes mainly at postgraduate level. At undergraduate level, there is only a very limited number of such programmes, which might be related to the multidisciplinary nature of these programmes. The cohort size of the ongoing programmes indicates that they are in good health despite their young age, suggesting the potential and need for many more. The results of this study are valuable for HEIs, policy makers, decision makers and governments as it provides an insight into the existing situation across Europe with regard to educational programmes directly related to disaster resilience which can help them to focus, direct and promote education in disaster resilience according to the needs at national and European level.

Western Sahara : international law, justice and natural resources

As the Spanish were preparing to leave colonized Western Sahara in 1975, Morocco invaded, sparking a war with the Western Saharan Polisario Front. About 70% of Western Sahara was occupied by Morocco, which stations up to 140,000 soldiers in the territory, primarily along a 1700 kilometre long sand berm that is protected by one of the world’s largest fields of landmines. In 1991, Morocco and the Polisario Front agreed to a truce ahead of a referendum on Western Sahara’s future. However, Morocco has since refused to allow the referendum to take place, and has begun the extensive exploitation of Western Sahara’s non-renewable natural resources. This has both highlighted the plight of the Saharawi people who live in refugee camps in Algeria and in occupied Western Sahara, and pushed the Polisario Front back to a position where it is openly canvassing for a return to war.