The paper provides an overview of geometric solutions of marking all types of serpentine by the method of internal circular curve in designing forest roads directly in the field. The main objective of presenting this ...The paper provides an overview of geometric solutions of marking all types of serpentine by the method of internal circular curve in designing forest roads directly in the field. The main objective of presenting this original method for marking all serpentine types in one place is to show similarities and differences in marking different types of serpentine, and identify opportunities for further research of this type. The method is based on the establishment of the minimum number of elements necessary to mark the serpentine on the forest roads and other budget elements and their design in the field. By using this method, construction errors or the number of attempts of serpentine marking are reduced, which increases the effects of design compared to the ones reached by the previous method of marking the serpentine on forest roads.展开更多
Over the last few years major changes have happened in the region of South-Eastern Europe. They have been significantly determined by the changes in international political relations, and that mirrors economic and pol...Over the last few years major changes have happened in the region of South-Eastern Europe. They have been significantly determined by the changes in international political relations, and that mirrors economic and political interests of some countries. With its 27 member countries and the population of almost halfa billion people, the EU is a significant factor on the world scene. The aim of this paper is to point out that the future of Southeast European countries is, undoubtedly, within the flame of European integration. Moreover, it shows that the EU accomplishes a dominant role in the global economic area. That is also indicated by economic relations of the EU with the South-East European countries, with special regard to Serbia, as it is elaborated in this paper. This paper also examined and compared relations in terms of GDP in South-East European countries, as well as the highest import and export by sectors in relation Serbia--the EU. For the purpose of this research, the information from the world economic data base was used as the parameter of the research, and the information from the relevant financial institutions in Serbia. The main findings showed which countries in the South-Eastern Europe have the highest economic potential, which countries had positive GDP growth rate, the fact that Serbia had export growth of goods and services towards the EU and all the difficulties which followed that export. Finally, taking into consideration all the parameters, it can be concluded that the goal and future of South-East European countries is within the EU integration.展开更多
In the present paper the attention is focused on the effect of small cavities inside in-line tube banks on acoustic resonance which occurred in the two-dimensional model of boiler. We measured the sound pressure level...In the present paper the attention is focused on the effect of small cavities inside in-line tube banks on acoustic resonance which occurred in the two-dimensional model of boiler. We measured the sound pressure level, the amplitude and the phase delay of acoustic pressures and the gap velocity. As a result, we found many peak frequencies of sound pressure level with different Strouhal numbers, mainly about S1=0.15, 0.26 and 0.52. The variation of SPL for S,=0.26, 0.52 components in the tube banks with cavities was the same as the result of no cavities. The existence of cavities inside in-line tube banks caused the resonance of St=0.15. And the acoustic resonance of the first mode in the transverse direction was generated if the small cavities existed inside the tube banks. This resonance was not generated from the tube banks of no cavities. The resonance onset velocity in the transverse mode was fairly slower than that of no cavities. It was easy to generate acoustic resonance when there were small cavities inside in-line tube banks.展开更多
文摘The paper provides an overview of geometric solutions of marking all types of serpentine by the method of internal circular curve in designing forest roads directly in the field. The main objective of presenting this original method for marking all serpentine types in one place is to show similarities and differences in marking different types of serpentine, and identify opportunities for further research of this type. The method is based on the establishment of the minimum number of elements necessary to mark the serpentine on the forest roads and other budget elements and their design in the field. By using this method, construction errors or the number of attempts of serpentine marking are reduced, which increases the effects of design compared to the ones reached by the previous method of marking the serpentine on forest roads.
文摘Over the last few years major changes have happened in the region of South-Eastern Europe. They have been significantly determined by the changes in international political relations, and that mirrors economic and political interests of some countries. With its 27 member countries and the population of almost halfa billion people, the EU is a significant factor on the world scene. The aim of this paper is to point out that the future of Southeast European countries is, undoubtedly, within the flame of European integration. Moreover, it shows that the EU accomplishes a dominant role in the global economic area. That is also indicated by economic relations of the EU with the South-East European countries, with special regard to Serbia, as it is elaborated in this paper. This paper also examined and compared relations in terms of GDP in South-East European countries, as well as the highest import and export by sectors in relation Serbia--the EU. For the purpose of this research, the information from the world economic data base was used as the parameter of the research, and the information from the relevant financial institutions in Serbia. The main findings showed which countries in the South-Eastern Europe have the highest economic potential, which countries had positive GDP growth rate, the fact that Serbia had export growth of goods and services towards the EU and all the difficulties which followed that export. Finally, taking into consideration all the parameters, it can be concluded that the goal and future of South-East European countries is within the EU integration.
基金supported by Grant-in-Aid for Scientific Research (C) from Japan Society for the Promotion of Science
文摘In the present paper the attention is focused on the effect of small cavities inside in-line tube banks on acoustic resonance which occurred in the two-dimensional model of boiler. We measured the sound pressure level, the amplitude and the phase delay of acoustic pressures and the gap velocity. As a result, we found many peak frequencies of sound pressure level with different Strouhal numbers, mainly about S1=0.15, 0.26 and 0.52. The variation of SPL for S,=0.26, 0.52 components in the tube banks with cavities was the same as the result of no cavities. The existence of cavities inside in-line tube banks caused the resonance of St=0.15. And the acoustic resonance of the first mode in the transverse direction was generated if the small cavities existed inside the tube banks. This resonance was not generated from the tube banks of no cavities. The resonance onset velocity in the transverse mode was fairly slower than that of no cavities. It was easy to generate acoustic resonance when there were small cavities inside in-line tube banks.
