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The possibility for differential pulse polarography (DPP) determination of s-triazine has been shown and compared with gas-chromatographic (GC) measurements. Good agreement was found between GC and DPP measurements in analyzing 20 samples of industrial wastewater. It was found, using controlled potential coulometry (CPC), that four electrons take part in electrochemical reduction steps. On the basis of this and polarographic measurements, the mechanism of electrochemical reduction of s-triazine was postulated.

O(3), NO(2), SO(2), CO and PM(10) concentrations, simultaneously determined for the first time in Belgrade urban area in the autumnal period of 2005, are presented. The obtained results display similar behaviour of SO(2), NO(2), CO, PM(10) opposite from that of O(3). The weekend effect was also investigated showing diminution of average daily concentrations of SO(2), NO(2), PM(10) and CO for 72, 40, 37 and 42% respectively, and increase of the average daily concentration of O(3) for 56%. Influence of meteorological conditions on observed concentration levels was studied, too. The observed influence of wind speed on the O(3) nightly concentration levels was analyzed pointing to the phenomena of O(3) transport during episodic measurements. To make an identification of possible pollution sources and analyse the influence of meteorological parameters on pollution levels, air back trajectories for high level concentrations episodes were calculated and analysed. A multivariate receptor modelling (Principal Component Analysis, Cluster Analysis) has been applied to a set of data in order to determine the contribution of different sources. It was found that the main principal components, extracted from the air pollution data, were related to gasoline combustion, oil combustion and ozone transport.

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Waste stream characteristics must be understood to tackle waste management problem in Tripoli city, Libya. It is recognized that information on both quantity and composition of generation waste is important for the effective planning of household waste handling infrastructure. So, this study is aimed to evaluating the generation, composition and density of household solid waste in Tripoli city, Libya. The study is carried out according to the Annex 2.

In the 21st century, education represents a key factor of economic and social development of a community. The majority of traditional methods intended for education are no longer suitable for it, since they are unable to meet the students' needs. Mobile learning represents a new educational channel, which allows access from any place at any time. In this paper, an overview of various forms of education is provided, concepts of mobile learning are discussed, educational mobile applications are analyzed, and the design and the prototype of a mobile application intended for learning, called mTester, is described. Finally, the paper presents a case study of mobile learning use, conducted at the Business School of Applied Studies in Blace, Serbia. The first results show an improvement in the realization of courses and in the students' final grades. ß 2016 Wiley Periodicals, Inc. Comput Appl Eng Educ 24:412-420, 2016; View this article online at wileyonlinelibrary.com/journal/cae;