1,625 research outputs found

    Defining region

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    Regional studies are right in the center of scientific and political discourse at the moment; regional issues acquire special significance in the countries with a transition economy. However, there is still no clear definition of the term “region”. Due to its multifaceted nature, it certainly has natural, cultural, economic, political, and social dimension. At the same time, this term occupies a wide range of phenomena from small parts of countries to huge continental interstate formations. The goal of this paper is the analysis of various theoretical and methodological approaches to the definition of the region. We have brought different approaches, from the classical school to the New Economic Geography. The latter considers the region as a unit of space for economic activities. Thus, the region becomes a multidisciplinary object of research within the framework of economic theory and economic geography. In Europe, the integration processes put the region on the forefront of economic policy. The issues of regional policy are equally important in the light of the economic modernization processes taking place in Russia and Serbia. This article also summarizes the experience of regional studies of Serbian and Russian schools. The results can be used in further theoretical and applied research, writing theses in the field of economics and economic geography

    Economy and Ecology: Encounters and Interweaving

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    In this editorial text, we point to the importance and development of disciplines that closely link economic sciences with ecology. Drawing on the most important literature in these fields, we have highlighted the trends that are popular today in both fields (double eco features)

    Super-slippery Carbon Nanotubes: Symmetry Breaking breaks friction

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    The friction between the walls of multi-wall carbon nanotubes is shown to be extremely low in general, with important details related to the specific choice of the walls. This is governed by a simple expression revealing that the phenomenon is a profound consequence of the specific symmetry breaking: super-slippery sliding of the incommensurate walls is a Goldstone mode. Three universal principles of tribology, offering a recipe for the lubricant selection are emphasized.Comment: 4 pages, 2 figures, 1 table; pdf available from: http://www.ff.bg.ac.yu/qmf/qsg_e.ht

    A Household Daily Non-Mandatory Activity Participation and Duration Modeling Accounting for Person Level Budget Constraints

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    A key methodological and behavioral innovative component in recent Activity-Based Models (ABMs) used for transportation planning is the household-level non-mandatory activity participation component. While traditional ABMs use a series of simple models to predict non-mandatory activity participation decisions in a sequential manner (which is often not correct), the Multiple Discrete Continuous Extreme Value (MDCEV) model can model both individual and joint non-mandatory activity participation and time allocation decisions in different out-of-home activities of all household members simultaneously. A key advantage of the MDCEV framework is that it accounts for complex intra-household interactions among different household members by allocating the total household time available in a day to different household members in a utility-consistent manner. However, the earlier time-use models worked with a single household level time budget constraint. So, the model ensures consistency of time predictions with the total household available time but it can violate person level budget constraints. The primary objective of this thesis is to enhance the behavioral and prediction accuracy of the MDCEV model in the time-use context by developing an improved model that handles multiple person level budget constraints