In the current study a ternary Cu-Ge-Sb system has been experimentally assessed. Chemical andphase compositions of the alloy samples from three vertical sections Cu-GeSb, Ge-CuSb and Sb-CuGe were studied using scanning electron microscopy (SEM) and energy dispersive spectroscopy(EDS) and confirmed by X-ray diffraction analysis (XRD). Hardness of th...

By Dejan Gurešić, Aleksandar Đorđević, Aleksandar Marković, Milica Tomović, Nadežda Talijan, Ivana Manasijević

A reliable operation of the equipment is primarily important for each installation. One of the measures of safe operation steam-boiler systems is purity pipes. Very acceptable method of determining the soiling pipe is a method of staining.In this paper is described the determination of soiling boiler tubes in power plant Ugljevik after a decade of ...

By Bosiljka Stojanović

Use of water for recreation or treatment of very it’s very important to maintain health and working capacity of the population. A significant number of people temporarily or permanently, used pools for that purpose. That is why today, in the developed countries, great attention is paid to the quality of water for recreation. The aim of this w...

By Bogoljub Antonić, Miladin Gligorić, Aleksandar Došić, Dragan Vujadinović, Ranko Grujić, Danijela Babić

The fruit of plane trees is used to obtain the powdered activated carbon. As the activating agent is used in the preparation of concentrated phosphoric acid. Completed the equilibrium adsorption of cationic methylene blue dye in the synthesized material. These results were fitted with three adsorption equilibrium model. The experimental results wer...

By Vladimir Dodevski, Branka Kaluđerović, Sanja Krstić, Đuro Čokeša, Danijela Brković

In this study the 3D surface model was successfully applied in investigating the influence of theprocess parameters on the physical and mechanical properties of the glass-ceramics. Glassceramicswas produced from coal fly ash and waste glass through the sintering method. The rawmaterial was taken from “REK Bitola”, a thermal power plant ...

By Biljana Angjusheva, Emilija Fidancevski, Kiril Lisichkov, Vojo Jovanov

Based on relations for the maximum work at the closed thermodynamic system, the paper presents implementation of a general model for determining the minimum storage volume for compressed air. Due to the mechanical and thermodynamic imbalance of observed model, there are the conditions for obtaining the maximum work. Derived relations, which represe...

By Mitar Perušić, Branko Pejović, Radislav Filipović, Milenko Smiljanić, Mirko Radić

Our recent study on consolidation of marble samples with the purpose of culture heritageprotection occurred by periodical calcium oxalate precipitation on top of quasi parallelepipedicsamples. The overall process consisting of three stages of treatment, starting with 5 % calciumacetate solution for 60 minutes at 20°C, a draining step at 70°...

By Rihana Terzu, Edlira Baraj, Shun Yu, Christiane Förester, Holger Kropf, Kledi Xhaxhiu, Marsilda Come

Two different studies of the thermal aging of polyesters based on lactic and glycolic acidswere compared. Thermal degradation of poly(L-lactic acid) (PLLA), poly(L-lactic acid-co-glycolicacid) (PLLGA) and poly(DL-lactic acid-co-glycolic acid) (PDLGA) was studied by the dielectricthermal analysis (DETA). The aging was performed at 37C in vacuum ove...

By Aleksandra Porjazoska Kujundziski, Dragica Chamovska

The investigated material is a corrosion-resistant, Cu precipitation hardened steel 17-4PH,which undergoes a macroscopic contraction, as a result of applying the following heat treatment:double solution treatment at 1028°C for 1 h (condition A), ageing at 540°C for 4 h (conditionH1025). The second solution treatment at 1028°C was found ...

By R. Sowa, E. Roga, S. Arabasz, A. Dziedzic, I. Dul, A. Kowal, M. Parlinska-Wojtan

Fly ash is useful for a variety of applications, because it is a plaster or silicate or aluminosilicate material which is in an isolated form and in the presence of water is combined with calcium hydroxide (from lime, portland cement or dust from furnaces) and formed mixtures with the characteristics of the binder. In this project analyzed the poss...

By Goran Tadić, Miladin Gligorić, Aleksandar Došić, Radenko Grujić