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Heat and exhaust emissions are representing two of the major health and safety issues induced by the presence of Diesel-mounted equipments in underground mines. The first one has greater effects in deep mines, while the second one requires a careful dimensioning of ventilation airflows in all mines. Taking into consideration the higher exposure level of Diesel mounted equipment drivers at the noxious products contained in the exhaust emissions, it clearly appears as a major safety concern the need for an expeditio...

The submitted paper describes general data about geology, hydrology and hydrogeology of Radovesice dump. There are eleven hydrogeological monitoring objects in the area of interest. Monitoring of the water level in these objects is proceeding every month. Hydrogeological objects are situated to the aquifers inside the dump body and close to the dump floor. Between January 2009 was realized the new monitoring object with six pore pressure sensors. The submitted paper shows particularly our experiences with the eval...

Operation research is scientific system discipline, that at the same time ranking to the praxeology disciplines – science about rational organization of human activity, applied to the area of management in the economy and in the other areas (research, health care, transport, schools, state administration, urbanism, cosmic research, army, etc.). Operation research is orientated to the operation of production, transport, division, services, supplying, stocking, renovation, development, conflict solving, etc. Many ...

For many years, natural disasters were perceived as unavoidable strokes of misfortune brought about by nature’s unpredictable forces. Taking into consideration the magnitude of the tsunami in Asia in 2004, the heavy floods in Mozambique in 2000, and Hurricane Mitch in Central America in 1998, we can see that developing countries are the most victims of such events, mostly due to their limited capacities and resources to mitigate disasters. On another hand is quite visible the efforts that are put on places both ...

As it is well-known, Holland’s theory of vocational choice offers a dependable framework for students’ college expectations and experiences. According to Holland’s theory of vocational choice, students’ personally types and the factors which come from students’ environment are very important regarding of the effectiveness of academic programs. In other words, there should be a kind of person-environment fit. This research aims at clarifying the relation between students’ personally types and their envi...

This paper aims to reflect some concerns regarding the waste management and to highlight its peculiarities. Waste management methods differ depending on the degree of development of a country, the type of area (rural, urban, industrial, residential) and the type of waste. Wastes covered by this article are non-hazardous and hazardous municipal waste (household and similar waste from commerce, industry and institutions), in addition with several other specific waste streams: packaging waste, construction and demoli...

One of the most important factors in economical development is using the resources efficiently. Land possession has a special importance in agriculture which is one of the main sectors of economy. Land is a limited and needed resource which is impossible to reproduce. On the other hand, many scientists explained that agricultural lands have been reduced day by day. For that reason it is necessary to make every kind of regulations and implantations for efficiently and fertile use of lands. One of the most important...

The completion string is the most important component in petroleum production system and should be designed and installed precisely, and maintained properly. If the well suffers scale production problem the importance is multiplied. In this study the four major completion techniques commonly used for non-organic depositions is introduced. The subject has been case studied for one of southern Iranian oil wells with inorganic material production problem. The simulations were run using the Prosper software, and were ...

Determining the optimal location of wells with the aid of an automated search method can significantly increase a project’s net present value as modeled in a reservoir simulator. This work addresses the efficient solution of this problem by using advanced techniques for coupling two important components of autonomic optimization: Dynamic model using Eclipse simulator software (E100), an optimization technique based on the genetic algorithm (GA). Profits and costs during the time period of the project were taken ...

Fine grinding involves a large number of parameters in its operation. In this study, the effect of some parameters such as initial particle size, filling volume of the ball and ball size distribution on fine grinding of calcite powders (-200, -150 and -100 $\mu$m) using a laboratory stirred ball mill was studied under wet conditions. Zirconia beads (ZrSiO4) were used as grinding media with 1.0-1.2, 2.0-2.2 and 2.8-3.0 mm. A series of batch experiments using 2 3 full factorial designs was conducted to determine opt...

For a better definition of the Actual Climatic Optimum (the so called “global warming”) a detailed analysis of the Holocene climate is imperative. This paper broaches this analysis from the perspective of the “mini-glaciations” climatic cycle with a 1,000 yrs period which a series of authors took into consideration. The causes of these cycles are represented by periodical variations of the solar activity. But our analysis has covered a larger stratigraphical interval (23,000 yrs) including the W\"urm III s...