رضا محمودپور

During the recent years, changes in the economic, social and cultural fields, improving the health of society, decreasing fertility, followed by decreasing population growth and increasing life expectancy have led to significant changes in the country's population structure. The aforementioned macro trends, along with the driving factors, have had consequences for the population of the Islamic Republic of Iran. The purpose of this research is to determine the consequences of environmental macrotrends on changes in the age structure of the population of the Islamic Republic of Iran in the horizon of 1410 And therefore, the main issue of this research will be based on the purpose of the research, based on what this issue is. This research is a developmental-applied research and in terms of descriptive-analytical research method, which is collected by the library and field information collection methods, and after obtaining the opinion of the statistical community (42 people) about the data analysis using the statistical quantitative methods of the tables The frequency distribution and inferential analysis of the sample t-test statistical test and the average rank of the data have been carried out and then the conclusions have been drawn. The findings of the research show that 13 consequences affected by the four macro-environmental trends of individual changes, economic changes, cultural changes and social changes will affect the age structure of the country's population in the horizon of 1410

Over the last decade, wind turbine technology has made remarkable progress and new turbines with great variety has been proposed every year. Each of these products has its own advantages and can be very practical when operated under suitable conditions. However, due to their extensive functionalities and wide variety, selecting and operating the appropriate turbine often becomes a challenging and highly specialized task. The primary objective of this research is to examine and compare the advantages and disadvantages of wind energy harvesters, with the main focus on miniature wind turbines. The study contributes to the development of existing technical knowledge in the field of wind energy harvesters by compiling previous research on small wind turbines based on various physical characteristics such as power, structure, and performance. In addition, the article evaluates different harvesters based on statistical information and assesses innovative technologies and the combination of different energy harvesting methods. The comprehensive classification provided for these miniature systems reveals that, besides conventional wind turbines like vertical and horizontal axis turbines, new harvesters such as vortex-bladeless, EWICON, Sophonian, and Involex can perform well under suitable conditions, considering their working principles, energy conversion mechanism, and physical structure.