ANANALYTICAL STUDY OF MARBLE CONSOLIDATION BY OXALATE PRECIPITATION USING DENSITY, FTIR AND POWDER-XRD MEASUREMENTS
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
BIOSORPTION OF METHYLENE BLUE BY WASTE APRICOT SHELLS FROM FOOD INDUSTRY
In this paper, the removal of methylene blue (MB) from aqueous solution by biosorption ontoapricot shellshas been investigated through batch experiments. Apricot shells were chosen as alocally available and abundant waste from fruit juice industry. Methylene blue is common pollutantof waste waters from textile industry.The influence of initial MB c...
By Tatjana Šoštarić, Marija Petrović, Jelena Milojković, Jelena Petrović, Marija Stanojević, Časlav Lačnjevac, Mirjana Stojanović
GEOTHERMAL ENERGY OF THE REPUBLIC OF SRPSKA AND HYDROCHEMICAL ASPECTS OF ITS EXPLORATION AND EXPLOITATION
One of the most used renewable energy sources worldwide is geothermal energy. Itrepresents the heat, originated by natural processes happen in the Earth interior. The hot springsphenomena are the most frequent natural manifestation of geothermal activity.Geothermal potentiality of some area can be estimated based on geothermal gradient. Geothermalg...
By Andrijana Stevanović, Boban Jolović
A METHOD FOR DETERMINATION OF SEPARATION PROPERTIES OF MEMBRANES
In this study, design of lab scale device for determination of separation properties ofmembranes is presented and analyzed. Device operates with different gas pressure betweenchambers, whereby gas streams perpendicular to the membrane. Using appropriate acquisitionsystem and applying mathematical formulas, mechanism for gas transfer through the mem...
By Aleksandar Grujić, Mirko Stijepović, Jasna Stajić Trošić, Jovana Ilić, Dragutin Nedeljković
INFLUENCE OF GLUCOSE ON SPECIFIC SURFACE AND TEXTURAL PROPERTIES OF NANO CRYSTAL MESOPOROUS ALUMINA
Powders based on oxides and oxyhydroxides of aluminum, depending on their characteristics, have very diverse applications in various areas of the chemical industry. In recent years, obtaining powders with nano scale particle size, significantly expanding the possibilities for the application of this type of materials, especially in the field of so-...
By Zoran Obrenović, Miladin Gligorić, Aleksandar Došić, Vladimir Damjanović
THERMAL AGING STUDY OF BIODEGRADABLE POLYMER MATERIALS BY DIELECTRIC THERMAL ANALYSIS
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 37C in vacuum ove...
By Aleksandra Porjazoska Kujundziski, Dragica Chamovska
INFLUENCE OF DOUBLE SOLUTION TREATMENT ON HARDNESS IN 17-4 PH STEEL
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
ACID ACTIVATION OF PRRENJAS CLAY MINERAL
Prrenjas clay mineral is found in southeast Albania and has a high content on bentonite. Theinfluence of the sulphuric acid activation on the composition, structure and surface properties ofPrrenjas clay mineral is investigated in this study by means of elemental chemical analysis, X-RayDiffractometry, IR Spectroscopy and gas adsorption-desorption ...
By Altin Mele, Krenaida Taraj, Arjan Korpa
ION-CHROMATOGRAPHIC DETERMINATION OF IONS IN BIODIESEL, BIOETHANOL AND BIOGAS
The reduction of the greenhouse gas emissions and the assessment of renewable energy sources are among today’s most challenging tasks. In this context biofuels have emerged as promising alternatives. Successful commercialization and market acceptance of biofuels are dependent on the presence of ions that induce negative impact on the vehicle ...
By Ljubiša Ignjatović, Ivana Sredović Ignjatović
FOOD ALLERGENS - PRESENCE, RISKS AND MANAGEMENT IN FOOD INDUSTRY
Food allergy is a reaction of the body immune system to the presence of the proteins in the body introduced through food. Allergic reactions can affect the skin (hives), gastrointestinal organs (nausea, cramps, diarrhea), respiratory system (attenuation) and circulation (drop in blood pressure). In extreme cases, anaphylaxis can occur.. In this cas...
By Radoslav Grujić