This paper analyzes the managerial aspect in the implementation of international environmental management standard ISO 14001:2004. It is known that the implementation of this standard has all the elements of the project approach, which is the responsibility of the management of organizations (companies, institutions, etc.) is crucial. This aspect is analyzed for its impact on all other elements in the management of the environment, directly on the determination of the needs for the introduction of environmental management systems, formulation of environmental policy, planning activities, implementation plan, measure results, evaluation of results achieved, and continuous improvement. The concept of EMS (Environment Management System) is based on the introduction of a systematic and logical conditional process of environmental management in the way that affects the organization, control and prevent adverse environmental impacts that are reflected through the work of the same, and the role of the organization management and managerial approach is reflecting to the essence and form of implementation of international standards.

Mesoporous silica particles were prepared from highly basic sodium silicate solutions, having different silica modulus and SiO 2 concentrations, by adding sulphuric acid at different temperatures. Pore structure of prepared silica particles (aggregates) is strongly influenced by processing conditions and easy controllable in broad range of the specific surface area, pore size, pore volume and size distribution. It is shown that there is a clear correlation between volume of absorbed oil and processing parameters used in preparation of silica aggregates. Thus, oil absorption is higher in the samples prepared from sodium silicate solution with higher SiO 2 concentration and at higher synthesis temperature.

Starting from the Fourier's law for stationary heat transfer and Ohm's law for DC through the resistor, the paper presents the analogy between thermodynamic and electrical quantities. Based on this analogy, has been used knowledge of circuit theory for of the heat transfer through walls in the multilayer characteristic positions to derive the schematic representation of corresponding heat resistors. At the end of paper, has been shown two typical examples of calculation heat transfer to the complex multi-layer walls in different positions, by applied electrical analogy.Heat transfer, Electrical analogy, Heat resistance, Electrical resistance, Equivalent systems

In this paper, starting from general tangent equation in arbitrary point of specified curve, using principles of differential geometry and given mathematical transformation tangent equation of polytrophic function in p – v diagram was obtained. This form is convenient for solving numerous practical and theoretical problems in engineering thermodynamic by means of graphical method. It was shown that tangent can be constructed easily, using polytrophic equation only, but it is not example with other functions appearing in thermodynamics. Later, in this paper, we have given some methods, which refer to more exact construction of polytrophic and graphical analyze of polytrophic process.

Main objective of this paper is feasibility of alumina cement production on the Republic of Srpska resources basis. As is known calcium-alumina cement is type of mineral hydraulic binder. As basic resources of CAC production are used bauxite and calcite. There are two main production processes: the fusion, Al2O3 less than 50% and the sintering process, Al2O3 higher than 50%. Republic of Srpska has two main bauxite deposits: Milici and Srebrenice mines and alumina factory in Zvornik. There are a couple calcite deposits with possible CAC technology requirements. Also the nearest CAC factory is in Istria, Republic of Croatia.

This paper in technical and economical view analyzed characteristic solutions which are applied in process industry practice in design of welded constructions. In presented examples was showed possible irregularities and recommendations for finding better solution. Given examples could be used by designer in choosing final construction solution.