Vojnotehnicki glasnik / Military Technical Courier

29-44

Authors: Stopić Srećko R., Friedrich Bernd G.

A wide spectrum of hydrometallurgical processes offers many promising approaches for industrial application in order to improve the environmental impact of conventional metals productions, or for replacing hydrometallurgical processes whose gas emissions and a high content of formed metals (As, Cr, Pb) are becoming increasingly unacceptable. The main advantages of pressure hydrometallurgy are fast kinetics, enhanced selectivity over iron and other dissolved species. The pioneer work on hydrometallurgical operation (dissolution, precipitation, metal winning) was performed in Russia at the beginning of the previous century, mainly by Ipatieff and Bayer, each working independently in Saint Petersburg. Gradually, industrial application took place firstly in aluminium and later in nickel production. Today, in addition to nickel and aluminium, the pressure hydrometallurgy is well established in a wide spectrum of industrial applications for production of different metals (gold, zinc, molybdenium, titanium, germanium) from ore deposits and secondary materials. High pressure leaching in combination with other metallurgical operations (cementation, precipitation, solvent extraction, and electrowinning) provides an adequate technology to reintroduce lost metals into the industrial cycle, thereby saving resources and energy, while keeping the environment cleaner. It seems that pressure hydrometallurgy might be a very important key to better and nonpolluting processes in production of metals.

71-90

Authors: Kokelj Tugomir R., Milinović Momčilo P., Jeremić Olivera M.

A problem of selecting an artillery target while firing from a multiple launch rocket system (MLRS) is not considered frequently in literature. A solution to that problem involves a good agreement among many elements such as shooting dispersion law of distribution, destruction target laws, dimensions of target, and the rate of fire. In this paper, the problem is discussed only for a 128 mm multiple launch rocket system (MLRS) M77, known as 'OGANJ', with an unguided wrap around low-spin stabilized rockets with deflectors - aerodynamic brakes for ballistic trajectory control. The paper considered the advantages and disadvantages of the brakes in live fire using the proximity artillery service methodology.

106-130

Authors: Biočanin Stojko Lj., Pavlović Milan R.

The application of preventive maintenance contributes significantly to providing the required level of readiness of complex technical systems used in organizations of special purpose. The basic requirement in applying this model of maintenance is to determine the optimal periodicity that should satisfy some mutually conflicting criteria. This paper presents a methodology for determining the periodicity of the preventive maintenance of V46-6 engines on the basis of collecting and processing statistical data about their malfunctions. This problem can be solved if all important requests and limitations are determined. The basis of the presented methodology is the reliability parameters of the analyzed engine, obtained by observing the engine behavior, from the aspect of occurrence of failure in real service conditions, and also its maintenance costs.

146-160

Authors: Samčović Andreja B.

This paper gives an overview of the Digital Video Broadcasting - Handheld standard DVB-H, as a part of the DVB Project. This standard is based on the previous standard DVB-T, which was developed for the terrestrial digital television. The ways of DVB-H signal transmission are also described. Development of advanced technology enabled the digital video broadcasting over wireless portable terminals. This paper discusses the key technological features of the DVB-H standard, such as: time slicing, forward error correction, 4K mode and in-depth interleavers.

177-185

Authors: Bakrač Saša T.

In accordance with the requirements for the protection and development of environment, the usage of spatial data represents a specific need for different kinds of geographical and cartographical information. Theoretical and practical understanding of these requirements, with existing experiences and the use of appropriate standards, help in the process of solving particular ecological problems. In this paper, the analysis (theoretical understanding of the problem) and the comparison of models will try to point out the importance, requirements and possibilities of using existing data from different geo-topographical materials such as charts at different scales in analog as well as digital forms. Sources of information about an area: Cartographic-analytic collecting of spatial information for environmental purposes is carried out mainly from the following sources: satellite images, geographic information systems / Environmental Information Systems (GIS / EIS), Geo-topographic materials in analogue and digital (especially maps) forms and physical measurements of ambient environment. Types of maps which can be used for environmental protection: Base maps are widely used mostly for military purposes. Being highly detailed, these maps can be largely used for the purposes of environmental protection, especially topographic maps of a scale of 1:25 000 to 1:200 000 and 1:250 000. Thematic maps primarily give information on specific locations and specific content. For the purposes of environmental protection and improvement, thematic maps with specific topics are constructed most frequently. Combined maps are specific and they are a combination of base and thematic maps. These are, for example, political, travel, touristic, hydrological, and synoptic maps. Synthetic maps show the results and analysis of data collected. They cannot display all the characteristics or information related to the environment, especially data about complex ecosystems. Conclusion: For the purposes of environmental protection and improvement, the existing geo-topographic materials can be used, especially maps in the analogue and digital form. Based on the content and topics depicted, there are many different types of maps. All maps, especially those with the specific content important for environment, have highly variable characteristics. The geo-topographic materials of different scales and shapes, both in analogue and digital forms, in the Military Geographic Institute (MGI) are a good basis for environmental protection and improvement purposes.