The Inhibitive effect of ethanolamine on corrosion behavior of aluminium in NaCl solution saturated with CO2

In this study, the inhibitive effect of ethanolamine on corrosion behavior of aluminium was investigated in 3 wt. % NaCl solution, saturated with CO2. All the experiments were carried out at 20 °C. Ethanolamine was added at different concentrations between 1 mM and 8 mM. In order to determine the corrosion inhibition efficiency of investigated inhibitor and the optimal concentration of inhibitor that provides the lowest corrosion of aluminium, the open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), linear sweep voltametry (LSV) measurements, weight loss measurements as well as scanning electron microscopy technique (SEM) were performed. The electrochemical study and weight loss measurements indicated that the minimum corrosion rate and maximum inhibition efficiency was detected for concentration of 5 mM of ethanolamine, as well as the ethanolamine did not change the mechanism of aluminium dissolution. The adsorption of ethanolamine was found to obey Frumkin adsorption isotherm at concentrations up to 5 mM, but further increase in concentration was found to deviate from Frumkin adsorption isotherm. The calculated value for interaction parameter a indicates attractive lateral interactions in the adsorbed inhibitor layer. The obtained value of standard free energy of adsorption, ∆Gads θ , confirms that the adsorption process is favorable, spontaneous physisorption process

Hybridity in and Beyond Architecture: Liminal Conditions

The focus of this research is on hybrids and hybridity, with the emphasis on their liminal character – programme and formal non-finiteness. This paper presents a part of an ongoing doctoral research concerning theoretical frame for discussion and defining hybridity in architectural theory and practice. It deliberates hybridity through the social and humanistic discourse as well as theory of architecture in the context of both culture and architecture. The research describes hybrid as a condition, which can be observed through the concept of liminality and constant transformations, as opposed to finiteness of any kind. In this context, the aim of this paper is to locate and discuss hybridity in the contemporary architectural discourse, on the basis of etymological and connotative characteristics established through the architectural theory and other relevant disciplines in the field of social and humanistic sciences

The Inhibitive effect of ethanolamine on corrosion behavior of aluminium in NaCl solution saturated with CO2

In this study, the inhibitive effect of ethanolamine on corrosion behavior of aluminium was investigated in 3 wt. % NaCl solution, saturated with CO2. All the experiments were carried out at 20°C. Ethanolamine was added at different concentrations between 1 mM and 8 mM. In order to determine the corrosion inhibition efficiency of investigated inhibitor and the optimal concentration of inhibitor that provides the lowest corrosion of aluminium, the open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), linear sweep voltametry (LSV) measurements, weight loss measurements as well as scanning electron microscopy technique (SEM) were performed. The electrochemical study and weight loss measurements indicated that the minimum corrosion rate and maximum inhibition efficiency was detected for concentration of 5 mM of ethanolamine, as well as the ethanolamine did not change the mechanism of aluminium dissolution. The adsorption of ethanolamine was found to obey Frumkin adsorption isotherm at concentrations up to 5 mM, but further increase in concentration was found to deviate from Frumkin adsorption isotherm. The calculated value for interaction parameter a indicates attractive lateral interactions in the adsorbed inhibitor layer. The obtained value of standard free energy of adsorption, ∆Gads θ , confirms that the adsorption process is favorable, spontaneous physisorption process

Virus elimination from ornamental plants using in vitro culture techniques

Viruses are responsible for numerous epidemics in different crops in all parts of the world. As a consequence of their presence great economic losses are being incurred. In addition to the development of sensitive techniques for detection, identification and characterization of viruses, substantial attention has also been paid to biotechnological methods for their elimination from plants. In this review article, the following biotechnological in vitro culture techniques for virus elimination from ornamental plants are presented: meristem culture, thermotherapy, chemotherapy, cryotherapy or a combination of these methods. The plant species, as well as the type of virus determine the choice of a most suitable method. The state of the art in investigation of virus elimination from Impatiens sp. in Serbia is summarized.Virusi su odgovorni za brojne epidemije na različitim usevima u svim delovima sveta. Posledica njihovog prisustva su velike ekonomske štete, pa osim razvoju osetljivih tehnika za detekciju, identifikaciju i karakterizaciju virusa, velika pažnja se poklanja i biotehnološkim metodama za njihovu eliminaciju. U ovom preglednom radu predstavljene su tehnike in vitro kulture za eliminaciju virusa iz biljnog materijala: kultura meristema, termoterapija, hemoterapija, krioterapija ili kombinacija ovih metoda. Koja će metoda biti primenjena zavisi od biljne vrste, kao i od vrste virusa. U radu je dat pregled istraživanja na eliminaciji virusa iz Impatiens sp. u Srbiji.Projekat ministarstva br. TR-31019 and III4300

Kindergarten in Kragujevac [honourable mention 22nd Salon of architecture Novi Sad]

Vrtić u Kragujevcu projektovan je kao deo fabričkog kompleksa u izgradnji, na obodu grada. Blago nagnuta parcela povoljne orjentacije koristi se za planiranje slobodno stojećeg objekta dominantno prizemne strukture uz integralno oblikovanje spoljnog i unurtašenjeg prostora. ”Funkcionalno tretiran u duhu najbolje prakse arhitekture 60-ih i 70-ih godina 20. veka, objekat vrtića u Kragujevcu usvojene obrasce unapređuje savremenim arhitektonskim rečnikom oblikovanja i materijalizacije, te uspeva da odgovori na niz zahteva koji se postavljaju pred ovu vrstu objekta. Sve ovo, zajedno sa skladnim pozicioniranjem objekta u okviru njegovog prirodnog konteksta, govori o tome da bi, da je realizovan, ovaj vrtić postao veoma dobar primer i možda inicijalna tačka za razvoj arhitekture u svom urbanom okruženju.” (iz kataloga izložbe 22. Salona arhitekture u Novom Sadu

Determination of coincidence summing correction factors for 22na point source

The coincidence summing effect plays an important role in HPGe spectrometry, especially at low source-detector distances, due to a large solid angle; therefore, the calculation of correction factors is necessary. The aim of the research described in this paper was to compare values of correction factors for a 22Na point source obtained using the GESPECOR software package (Monte-Carlo method) and experimentally obtained values. Measurements were performed using a semiconductor HPGe spectrometer and the point source axially positioned at nine different distances from the detector end-cap. For the purpose of determining correction factors, a system of equations was formed, which, besides nuclear data as the input parameters, uses the experimentally obtained values of the total count in the entire spectrum, as well as the counts in the full energy peaks. The system of equations was solved for each particular case and correction factors were determined. By comparing the results obtained using the experimental and Monte-Carlo method, it was found that the correction factors for the 22Na point source have discrepancies less than 3%. The significance of these discrepancies was also verified from a statistical point of view using a Student's t-test. © 2019 RAD Association. All rights reserved.Conference of 6th International Conference on Radiation and Applications in Various Fields of Research, RAD 2018 ; Conference Date: 18 June 2018 Through 22 June 2018; Conference Code:14955

Valorization of Winery Waste: Prokupac Grape Seed as a Source of Nutritionally Valuable Oil

Valorization of winery waste is a promising solution for waste management with additional benefit of bioactive compounds isolation. The aim of this study was to analyze the nutritional and bioactive potential of oil derived from Serbian autochthonous grape seed variety Prokupac and to compare it with known international grape varieties. Additionally, two extraction methods (ultrasound assisted extraction and cold pressing) were used in order to determine their influence on physico-chemical and nutritive characteristics of grape seed oil. Different methods, including determination of physicochemical properties, content of bioactive compounds, oxidative stability and antioxidative capacity were used for the characterization of grape seed oils. Results indicated that the higher yield was obtained by ultrasound assisted extraction compared to cold pressing. The application of ultrasound assisted extraction resulted in increased α-tocopherol content and better antioxidant capacity and oxidative stability of oil. Significant differences in bioactive composition were observed for Prokupac seed oil compared to the other grape varieties. Oil extracted from Prokupac grape seed had the lowest content of polyunsaturated and the highest content of saturated fatty acids, the highest content of α-tocopherol and consequently, the best antioxidative capacity. Prokupac grape seed has a great potential for isolation of nutritive and bioactive valuable oil

Radon exhalation rate of some building materials common in Serbia

It is well-known that radon is the second important human carcinogen for lung cancer, after smoking. The major sources of indoor radon concentrations are soil and building material. Under certain conditions, a dose received from the inhalation of radon and its progenies can be higher than a dose received from the external exposure due to radium concentration in building materials. In this contribution, the results of the radon and thoron exhalation rate measurement from 9 commonly used building materials are reported. Exhalation rate measurements were performed with accumulation chamber method using active device for measurement of radon concentration. © 2019 RAD Association. All rights reserved.Conference of 6th International Conference on Radiation and Applications in Various Fields of Research, RAD 2018 ; Conference Date: 18 June 2018 Through 22 June 2018; Conference Code:14955

Određivanje korekcionih faktora za koincidentno sumiranje u slučaju tačkastog izvora Y88

У гама спектрометрији се често сусрећемо са ефектом коинцидентног сумирања, а самим тим постоји потреба за одређивањем корекционих фактора. Циљ истраживања описаног у овом раду је поређење вредности корекционих фактора за тачкасти извор 88Y добијених помоћу софтверског пакета GESPECOR (Монте Карло методом) и експериментално добијених вредности. Мерења су обављена помоћу полупроводничког HPGe спектрометра, при чему је тачкасти извор био позициониран на аксијалној оси детектора на девет различитих растојања од капе детектора. Формиран је систем једначина, који осим нуклеарних података, као улазне параметре користи и експериментално добијене вредности тоталног одброја у целом спектру, као и одброја испод фотопикова. На основу решавања система једначина одређени су корекциони фактори за коинцидентно сумирање. Упоређивањем резултата, утврђено је да се вредности корекционих фактора добијених помоћу ове две методе разликују до 3 %.In gamma ray spectrometry often deals with coincidence summing effect, and therefore calculation of correction factors is necessary. Coincidence summing effect play an important role in HPGe spectrometry at low source-detector distances, due to the large solid angle subtended by the detector at the source. The aim of research described in this paper was to compare values of correction factors for point source 88Y obtained using the software package GESPECOR (Monte-Carlo method) and experimentally obtained values. Measurements were performed using a semiconductor HPGe spectrometer, wherein point source was axially located on detector at nine different distances. The system of equations was formed whereas net areas in full energy peaks as well as in entire spectrum were used as input data. The system was solved and correction factors for point source 88Y were determined. By comparing the obtained values, it was found that correction factors obtained by these two methods have discrepancy less than 3 %.Зборник радова : XXIX симпозијум ДЗЗСЦГ : Сребрно језеро, 27-29. септембар 2017. годин

Određivanje korekcionih faktora za koincidentno sumiranje u slučaju tačkastog izvora Y88

У гама спектрометрији се често сусрећемо са ефектом коинцидентног сумирања, а самим тим постоји потреба за одређивањем корекционих фактора. Циљ истраживања описаног у овом раду је поређење вредности корекционих фактора за тачкасти извор 88Y добијених помоћу софтверског пакета GESPECOR (Монте Карло методом) и експериментално добијених вредности. Мерења су обављена помоћу полупроводничког HPGe спектрометра, при чему је тачкасти извор био позициониран на аксијалној оси детектора на девет различитих растојања од капе детектора. Формиран је систем једначина, који осим нуклеарних података, као улазне параметре користи и експериментално добијене вредности тоталног одброја у целом спектру, као и одброја испод фотопикова. На основу решавања система једначина одређени су корекциони фактори за коинцидентно сумирање. Упоређивањем резултата, утврђено је да се вредности корекционих фактора добијених помоћу ове две методе разликују до 3 %.In gamma ray spectrometry often deals with coincidence summing effect, and therefore calculation of correction factors is necessary. Coincidence summing effect play an important role in HPGe spectrometry at low source-detector distances, due to the large solid angle subtended by the detector at the source. The aim of research described in this paper was to compare values of correction factors for point source 88Y obtained using the software package GESPECOR (Monte-Carlo method) and experimentally obtained values. Measurements were performed using a semiconductor HPGe spectrometer, wherein point source was axially located on detector at nine different distances. The system of equations was formed whereas net areas in full energy peaks as well as in entire spectrum were used as input data. The system was solved and correction factors for point source 88Y were determined. By comparing the obtained values, it was found that correction factors obtained by these two methods have discrepancy less than 3 %.Зборник радова : XXIX симпозијум ДЗЗСЦГ : Сребрно језеро, 27-29. септембар 2017. годин