for some 3 million years, the archaeological record is characterized by stone tools undergoing incremental changes. then around 40,000 years ago, the monotony of lithics is terminated by a profusion of visual representations, generally considered to be the world’s first objets d’art. this collection include a series of portable objects, especially figurines and, later on, the famous cave painti...

One from main approaches to checking correctness of a concurrent system are state space methods. They are suitable for automatic analysis and verification of the behaviour of systems. In their basic form, they construct a structure that consist of all states that a system can reach, and all transitions that system can make between those states. This structure is called state space. State spaces...

The explosion of semantic data on the information web, and within digital philosophy, requires new techniques for organizing and linking these knowledge repositories. These must address concerns about consistency, completeness, maintenance, usability, and pragmatics, while reducing the cost of double experts trained both in ontology design and the target domain. Folksonomy approaches address co...

Background: An ammonia gas explosion poses immediate health hazards such as respiratory tract burns, skin and eye irritation, and potential death within seconds. It also causes long-term negative impacts on biodiversity, affecting aquatic life and vegetation. An explosion in the Firuzabad sodium carbonate factory in Iran led to massive ammonia gas leakage and the poisoning of several employees....

statement of problem: patients affected with “early onset periodontitis” (eop), are not similar regarding their neutrophil deficiency and researches have yielded contradictory results in this field. purpose: the purpose of this study was to evaluate different aspects of neutrophils’ activities in peripheral blood of such patients, especially those affected with prepubertal periodontitis and juv...

Today there is not enough scientific data on the energy level and velocity of an explosion in actual mine workings, which have a cross-sectional area larger than experimental workings. The objective paper to justify parameters workings based disclosure fire front development mechanism when coal dust explodes working with limited area. These studies can be basis for choosing speed action strengt...