Almost all countries face the problems of trade balance, although they are more inherent in developing countries and economies in transition. A majority of economists adhere to a common opinion that real depreciation may lead to an improvement of trade balance. That said, countries encountering trade balance issues use real exchange rate depreciation in order to improve trade balance. In fact, this research refers to the assessment of bilateral elasticity effect of real exchange rate depreciation and the income on export and import demand function of Serbia and its nine leading partners. 2004Q1-2015Q4 data and ARDL approach have been used in this research. The results obtained show the presence of the J-curve in cases of Germany, Austria and Croatia. On the other hand, we examined if the Marshall-Lerner condition was fulfilled in the case of bilateral trade with Austria. Finally, we found that the elasticity of income has a greater effect on the export and import demand function, in relation to the elasticity of the exchange rate.

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Abstract. 3D printing (3DP) is one of the innovative developments in rapid prototyping (RP) technology. The goal of the initial inception and progress of the technology was to assist the product development phase of product design and manufacturing. The technology has played an important role in educating product design and 3D modeling because it helps students/designer to visualize their design idea, to enhance their creative design process and enables them to touch and feel the result of their innovative work. This paper presents the results of the study done on the in-built potentials and limitations of 3DP technology when used for rapid manufacturing purposes.Keywords: 3D printing, rapid prototyping & manufacturing, printing accuracy. IntroductionRapid prototyping (RP) technologies are nowadays widely applied for production of parts that are based on additive fabrication principles. The technology integrates key disciplines and sets a different approach to the traditional procedure from design to manufacturing where 3D physical model of any shape directly from a Computer aided design (CAD) model is built layer by layer. As one of the leading RP technologies, the inception and development of 3DP technology has highly contributed in the product development phase of a product. Among others, the technology provides a unique opportunity to control the material composition [1-3] of the product by jetting different powder-based materials from different nozzles. The technology is playing an important role in educating product design and 3D modeling because it helps students/designers to visualize their design idea and to enhance their creative design process. It stimulates innovative work because it enables designers to touch and feel the result of their idea. It simplifies communication between different actors of a product, even with nontechnical ones. Further, it enables to develop prototypes at a comparatively high speed and low cost. The development of many other capabilities and techniques such as selective use of different materials, suitable post treatment (PT) techniques and color printing capabilities have opened many and diverse fields of applications.

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The basic objective of this paper was to determine the importance and potential restoration of brownfield sites in terms of economic prosperity of a particular region or country. In addition, in a theoretical sense, this paper presents the methods used in the identification of brownfield sites such as Smart Growth Network model and Thomas GIS model, and methods for evaluation of brownfield sites or the indexing method, cost-benefit and multivariate analysis.