Nikola Bobic

Predmet ovog rada je primena novog javnog menadžmenta u lokalnim samoupravama. Cilj rada je da prikaže osnovne odlike i prednosti koje primena novog javnog menadžmenta nosi sa sobom u okviru jedinica lokalne samouprave. U toku istraživanja su korišćene osnovne analitičke i sintetičke metode. Korišćen je eksploratorni metod prilikom pretraživanja literature i štampanom i elektronskom obliku. Primenjene su metode indukcije i dedukcije.The subject of this paper is the application of new public management in local self-govenments. The aim of the paper is to show the basic characteristics and advantages that the implementation of the new public management carries with them within the local self-government units. During the research, basic analytical and synthetic methods were used. An exploratory method was used when searching literature, both in print and electronic form. The methods of induction and deduction are applied

This paper describes studying the chemistry of the double-base propellant aging process of the grains from the START motor of the Soviet ground-to-air missile system, S-125 'Neva'. This system was introduced in the armament of the Army of Serbia, in the early seventies of the last century and it is still in use. In order to determine the extent of degradation of propellants and then assess their chemical stability, ten methods were used. Modern analytical methods confirmed that typical organic propellant stabilizers are not present in the tested propellants. Therefore, the chemical stability of this propellant had to be additionally tested by the methods which are not based on measuring the consumption of stabilizers such as: microcalorimetry method of heat flux measuring, vacuum stability test, heat storage test at 100ºC, methyl violet test at 120ºC and mass loss test.

The study describes the results of static, physicochemical and ballistic examination of double-based gunpowder charges, in order to establish the deviations from the demanded quality of mortar ammunition. The examinations were carried out on gunpowder samples used for laboration of mortar shells 60, 82 and 120 mm caliber and consisted of periodical measurements of the gunpowder mass loss, basic ballistic parameters, and compatibility testing of gunpowder and celluloid containers as well as chemical stability determination. The estimation of the gunpowder quality was performed by comparative analysis and the suggestions for more efficient production of it were given.

This paper reports the characteristics of the explosive TH-5, recycled (recovered) trinitrotoluene (TNT) with max. 5 wt-% of hexogen (RDX). The explosive TH-5 was obtained by delaboration of warheads and melting of explosive charges based on TNT and RDX and by separation (extraction) of high explosive components. The thermal characteristics of pure (virgin) TNT and RDX, and recycled explosive TH-5 are determined by differential scanning calorimetry. The possibility of processing TH-5 by pressing and casting is also examined. The comparative analysis of sensitivity of TH-5 and TNT to friction is determined, as well as compressibility of explosives, and the detonation velocity of pressed and cast charges. Based on the analysis of experimental results, the defense standard requirements for the quality of TH-5 are defined and possibility of practical application of explosive TH-5 was estimated.

The problem of assessing the chemical stability of nitrocellulose (NC) based propellants is examined with a focus on a comparative analysis of the home country based methodology and modern methods used in the world. The measurements were performed using the instrumental methods such as microcalorimetry аnd high pressure liquid chromatography. During many years of implementation, the disadvantages of the domestic method of microcalorimetry for the chemical stability assessmentby measuring the critical diameter of NC propellants in accordance with SORS 8069/91 standard have been noticed. Therefore, the priority of the research in the field of thermal activity of NC propellants is given to the method of measuring the heat flow in accordance with STANAG 4582 NATO standard. The analysis of the results of the assessment of the chemical stability of different types of gunpowders (GP) stored in collections under continental and mediterranean climate conditions has shown that there is no cor...