Railway Road Bridge in Novi Sad – Design and Erection

&lt;p&gt; The bridge is situated on the major international electrified railroad line No 2 (Belgrade-Budapest) and designed for to railway tracks (160 km/h), two road lanes and two footpaths, with the total width of 31,5 m. The bridge structure consists of four structures: two approach composite bridges at the banks and two steel tied network arch bridges over the river. The spans are 27,0 +177,0 + 3,0 + 219,0 + 48,0 m, totally 474,0 m in length. The heights of arches are 34,0 m and 42,0 m respectively. The arches and ties, as well as the girders of the approach spans, are steel box girders. The decks of the arch bridges are the composite reinforced concrete slabs with thickness of 300 mm. The launching itself is very complex and unique, in both analysis and construction. The arch bridges are fully assembled on the banks and launched by platforms and skids over the bank and by barges over the river, to the final position on piers.&lt;/p&gt;</jats:p

Redesigning current instruments as a precondition for a more effective environmental protection

The problems of environment and evaluation of natural capital belong to the phenomenology of externalities, and the requirements of environmental economics are ever more oriented towards the elaboration of the ecological-economic category of the externalization of internal expenses, wherefrom reasons for the introduction of ecological-economic instruments, before all payments for pollutions, ensue. Demystification of the negative conviction relating ecological payments as taxes is very important, since it must be shown that ecological payments correct, mitigate or remove externalities. Environmental protection is a complex system and it consists in a set of rules, measures and instruments that are applied for the surveillance of pollution sources, and shaping of instruments for environmental protection is a complex process intended for the accomplishment of established ecological goals. Among all instruments available for bridging the gap of internalization and exerting a significant effect on polluters to diminish their emissions of pollution, the ecological and economic ones are most important. The results of our investigation have demonstrated that it is necessary to reshape the current set of instruments regarding protection of vital functions of nature and an efficient environmental protection, and one of the key cognitions is that the scientific and professional public must not be excluded from the appraisals of creating and redesigning the instruments of environmental protection. These assertions have their foundation in the premise that the significance of elements of the social dimension in sustainable development is to a great extent determined by the level of environmental degradation and reduction in capacity of renewable sources. The paper, approach and data processing of the conducted research offer a new model and new elements of methodology for establishing the state and quality of the environment, whereby social-economic criteria of research (a socio-economic laboratory) are introduced into the fundamental analysis of the condition of crucial media of the environment, but also into shaping a more efficacious instrument set of protection. In such a way, a substantial contribution is given to the affirmation of a holistic and inter-disciplinary approach in the investigation and understanding the phenomenon of contemporary environmental reality, especially the central media of the environment (water, air, soil)