Population Growth in the Border Villages of Srem, Serbia

Population growth in the border villages of Srem (Vojvodina, Serbia) has been analysed in this paper, with the goal of explaining how and why it differed from other areas in the region. Special attention has been paid to the 1990s, because these villages became part of a border region and a high level of migration on the territory of the former Yugoslavia occurred, much of it through this territory. The results of the research are derived from literary resources and applying mathematical and statistical procedures in the processing of data received from the Statistical Office of the Republic of Serbia. They were checked on the field via a questionnaire. This paper is significant because it enriches knowledge about villages of Srem, the municipality of Šid and population trends at the end of the 20th century

Optical energy bandgap tuning of spinel zinc stannate by erbium/ytterbium doping

This work shows the results of an optical energy bandgap (Eg) investigation supported by scanning electron microscopy (SEM) of spinel-type zinc stannate (Zn2SnO4) upon doping with rear earth (RE3+) ions (Er3+, Yb3+). The powder samples are synthesized by a mechanochemical solid-state method with the final annealing step at 1200 C. The reference Zn2SnO4 powder sample bandgap (3.87 eV) turning lower upon doping, precisely to 3.5 eV, and 3.37 eV bandgap values found for Er-doped Zn2SnO4 and Er,Yb-codoped Zn2SnO4 powder samples, respectively is a confirmation of the successful incorporation of the RE3+ ions into the Zn2SnO4 host structure. Morphology of the obtained powders shows, in general, the non-uniformly shaped agglomerates, while their particle sizes follow up the bandgap decreasing trend with doping

Deep Eutectic Solvent Based Reversed-Phase Dispersive Liquid–Liquid Microextraction and High-Performance Liquid Chromatography for the Determination of Free Tryptophan in Cold-Pressed Oils

A fast and straightforward reversed-phase dispersive liquid–liquid microextraction (RP-DLLME) using a deep eutectic solvent (DES) procedure to determine free tryptophan in vegetable oils was developed. The influence of eight variables affecting the RP-DLLME efficiency has been studied by a multivariate approach. A Plackett–Burman design for screening the most influential variables followed by a central composite response surface methodology led to an optimum RP-DLLME setup for a 1 g oil sample: 9 mL hexane as the diluting solvent, vortex extraction with 0.45 mL of DES (choline chloride–urea) at 40 °C, without addition of salt, and centrifugation at 6000 rpm for 4.0 min. The reconstituted extract was directly injected into a high-performance liquid chromatography (HPLC) system working in the diode array mode. At the studied concentration levels, the obtained method detection limits (MDL) was 11 mg/kg, linearity in matrix-matched standards was R2 ≥ 0.997, relative standard deviations (RSD) was 7.8%, and average recovery was 93%. The combined use of the recently developed DES -based RP-DLLME and HPLC provides an innovative, efficient, cost-effective, and more sustainable method for the extraction and quantification of free tryptophan in oily food matrices. The method was employed to analyze cold-pressed oils from nine vegetables (Brazil nut, almond, cashew, hazelnut, peanut, pumpkin, sesame, sunflower, and walnut) for the first time. The results showed that free tryptophan was present in the range of 11–38 mg/100 g. This article is important for its contributions to the field of food analysis, and for its development of a new and efficient method for the determination of free tryptophan in complex matrices, which has the potential to be applied to other analytes and sample types

THE PERCEPTION OF UNETHICAL ISSUES IN SELECTED THAILAND TOURIST AREAS: MEASURING THE ATTITUDES OF FOREIGN TOURISM STUDENTS

The principal aim of the paper was to examine what kind of experience international exchange students, as future professionals in tourism industry, gained during their study at the Faculty of Hospitality and Tourism in Phuket, Thailand. Thus, the paper deals with how often they encountered the unethical issues in the tourism industry, and how these issues affect their perception of the image of Thailand as a tourist destination. The paper also explores how formal education in Tourism ethics affects the perception of Thailand tourism unethical practices, and as such, it is one of the first studies in this field. In addition, the paper intends to show if there is a relationship between formal education in Ethics in tourism and the respondents’ experience and perception of unethical issues. The results show that these unethical issues have the significant and very strong influence on tourism perception of Thailand with a special emphasis on exploitation of women and children in sex tourism. Also, the study indicates that respondents who have a formal education in Ethics were more aware and had a clearer picture of the negative effect of these unethical issues on the image of Thailand as a destination

The influence of policies on the rural part of the Pannonian plain, case study: region of Vojvodina

In this article are given the opinions by Pannonia countryside inhabitants that belong to the Republic of Serbia about some characteristics of everyday policy. The opinions are gathered by poll which was distributed by e-mail to different areas of the Province of Vojvodina. Namely, 122 participants who filled the poll correctly estimated ten stances. They were formed on the basis of the themes about which the farmers have most often discussed. Special attention was directed to differences concerning the opinion of participants of different gender and age structure, activity and political engagement. Descriptive statistics, T-test and one-factor analysis of ANOVA variance have been used for establishing the differences and were complemented by Post-hoc Tukey test. This paper could be used for improvement of connections and relationships among the politicians, policy and countryside

Moving to the Welfare Countries: Emigrants from Serbia 1961-2002

The main characteristic of Balkan region in history is permanent migration. The character of this migration is changed from period to period. After WWII in Serbia migrations had economical character. These migrations are dominated till the last decade of XX century. According to the 2002 census, in foreign countries lives more than 400,000 citizens of Serbia. About 50 percent of citizens emigrated in decades before 1990, and the next 50 percent emigrated in period between 1990 and 2002. About 80 percent of emigrations are from central Serbia, and rest are from Vojvodina Province. Major emigration from Serbia has been directed towards Austria, Germany and Switzerland. The number of emigrants from Serbia is also high in France, Italy and Sweden. Outside of Europe most of the emigrants went in the United States of America

Combined experimental and DFT study of lithium-indium-oxide structure and vibrational properties

A promising lithium-indium-oxide (LiInO2) wide band-gap semiconductor for scintillating detection, photoluminescence, and photocatalysis [1-3] was prepared by a mechanochemical solid-state synthetic procedure that can be found elsewhere [3]. Its structure and morphology were investigated by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy. SEM images show agglomerates of relatively uniform size of around 300 nm spherical-shaped particles of LiInO2 powder, while the XRD pattern confirmed the formation of the nanocrystalline tetragonal structure withamdI /41 space group (no. 141) symmetry. Detailed vibration analysis, together with the assignments of the band modes, was performed through the best-fit match of the experimental and density functional theory (DFT) calculated Raman spectrum. Geometry optimizations and vibrational frequencies calculations were conducted using B97-1 functional correlation [4] and LanL2DZ was used as a basis set