فهرست مطالب زهره بهشتی پور

A microgrid has two operating modes, parallel to the grid and islanded operation modes. In the parallel operation mode, the scattered productions inside the microgrid can be powered synchronously with the production network or they can be turned off, and in the islanded operation mode, the scattered productions supply the loads inside the microgrid. The purpose of this article is to improve the power quality and transient response of a microgrid including DG sources using power electronics in islanded and grid-connected modes. For this purpose, a control method using a mode feedback controller is used to control the switching of interface converters for compensating unbalanced and non-linear loads. In this controller, a 2nd-degree linear regulator is used to produce a suitable profit margin and it will deal with optimal load allocation between scattered production sources. The proposed compensator, while providing the real power required by the network, is capable of load balancing, harmonic compensation, and reactive power control. Also, the feeding of local loads can be divided by any desired ratio between the network and DG.

Medical tourism in Yazd city has been greatly developed as one of the treatment poles of the country and can be said that this industry has become one of the development axes of Yazd city. The purpose of this research is to identify the most important factors influencing the attraction of non-native medical tourists to the historical city of Yazd.

The current research was of a qualitative type conducted in the fall of 1401. Desk research and Delphi method were used to collect data. The statistical sample of this study included 41 experts in the fields of treatment, tourism, and urban planning, and these experts were selected based on their related specialties using a snowball method. After studying the theoretical foundations of the research, 41 effective factors in attracting medical tourists were specified from related research texts, and during studying, categorization and editing, 23 indicators were provided to the experts in the form of a questionnaire on a 5-point Likert scale, and at the end of the questionnaire, an open question was provided. After analyzing the answers, the results were recorded and a new questionnaire was created for the next stage, which was repeated 3 times. According to the results of the Kolmogorov-Smirnov test at a significance level of 0.05, the correlation between the factors was analyzed using the W. Kendall non-parametric correlation test and the SPSS 18 software, and the Delphi technique was used to achieve the research objectives.

In the course of data analysis, indicators with an average difference of less than 0.1 were confirmed, indicators with an average of less than 4 were removed, and other indicators were moved to the next stage. After completing 3 stages of the test, 12 factors were identified as the most important factors affecting medical tourism in Yazd city, and these factors were placed in 5 categories: characteristics of the treatment staff, characteristics of the hospital, economic factors, giving information and communication, and other related factors. According to W. Kendall's correlation coefficients obtained during the 3 Delphi steps, the convergence and agreement of experts' opinions were confirmed.

Considering that infrastructure indicators, personnel skills and economic factors are among the most important indicators of attracting medical tourists to the historical city of Yazd, it is suggested that to develop medical tourism in Yazd city, these items should be taken into consideration in managing the current situation of medical centers; Furthermore, investment should focus on the development of medical infrastructure.