The use of elemental analyses and isotope techniques for cement provenancing are reviewed. Based on the currently available data and approaches from related fields, future perspectives and a combined approach for cement provenancing are outlined.

– Within the last 20 years, there has been witnessed a significant increase of the urban population of Sarajevo, as a result of economic and social migrations. Consequently, this has caused an increasing demand for new housing which is mainly profit-oriented without any beneficial social, environmental or cultural implication. Primary objective of this research is to analyze the current situation and to assess the quality of the buildings not only as a housing solution, but as a complex that unites the community who inhabits it. This research will be conducted in a qualitative manner in analysis and statistical approach over the data related to the urbanization, building standards and positive effects of the building. Newly built parts of settlements Otoka and Stup will be used as case studies, since these parts of the city are most influenced by the mass production of the new housing solutions. This paper stresses out the correlation between high demand for the new housing and decreased quality of the housing without respecting minimum spatial and environmental standards, without basic amenities, social infrastructure and recreational and cultural activities. There is a need for improvements in contemporary housing design that will reflect with positive impacts on social, environmental, economic and cultural aspects of urban living.

Guns that operate on compressed air (Air Guns) are widely used in entertainment business. They are very common in Paintball and Airsoft competitive team sports and in performance riffles. Projectiles fired from these types of guns can reach more than 400 m/s. A Projectile weighing 5 g at this velocity has a kinetic energy of 400 J upon impact. This energy is sufficient for skin penetration and infliction of serious life threating injuries. This paper deals with projectile velocities, achieved with compressed air, needed for full penetration of the mild steel plate of 2 mm thickness. Projectile firing has been performed with custom made Air Gun capable of reaching compressed air levels up to 10 MPa and projectile velocities up to 160 m/s. Velocity of the fired projectiles has been recorded with High Speed camera after which it was possible to determine kinetic energy upon the impact and energy density as well. Experiments presented in this paper show that compressed air operated guns can deliver significant kinetic energy to the target, capable of inflicting serious injuries