Recent trends in daily temperature extremes over southern Montenegro (1951–2010)

Montenegro so far has been poorly investigated in terms of climate extremes. The aim of this paper was to analyse the extreme ETCCDI (Expert Team on Climate Change Detection and Indices) temperature indices in the Mediterranean region of Montenegro for the period of 1951–2010. Four stations in the coastal area of Montenegro have been analysed: Herceg Novi, Ulcinj, Budva and Bar. Two periods (before 1980 and after 1980) were separately investigated in this study due to a well-known climate shift that occurred in the late 1970s. Seven indices of temperature extremes have been chosen. The trend was analysed using a Mann–Kendall non-parametric test, while the slope was estimated using Sen's slope estimator. A negative trend has been calculated for cold nights and cold days at almost all stations. The most significant positive trends were obtained for warm conditions. The two separately investigated periods have shown contrasting temperature trends

CNG propulsion system for reducing noise of existing city buses

© 2016, Institut za Istrazivanja. All rights reserved. Noise pollution due to road traffic is a major global concern because of its negative impact on the quality of life in communities everywhere. In Republic of Serbia, traffic noise has become an increasingly noticeable and serious problem in large cities like Belgrade, Novi Sad, Niš, Kragujevacand Kraljevo. To resolving the current situation, in cities where exists the intensive noise pollution from diesel vehicles, as a special contribution to reducing noise in road traffic, we were studied the replacement of the existing city busses with new propulsion system on natural gas, resulting in less noise emission. The reduction of noise emission was confirmed during parallel tests of the buses with drive on diesel and natural gas. Intensive noise measurements were conducted according to the Regulation UN ECE 51R