درخت حوزه‌های تخصصی

Human beings employ different forms of linguistic politeness to ease communication and reduce the likelihood of conflict. With the rise of technology and social media platforms such as Email, Telegram, Twitter, WhatsApp, and Instagram, the concept of politeness has faced new challenges. The present study focused on Instagram comments and analyzed politeness strategies based on Leech’s grand strategy of politeness. The study examined a 20043-word corpus developed based on 696 posts across various topics on Instagram. The results revealed that Instagram users predominantly utilized negative politeness strategies (63.3%). Among the positive strategies, agreement constraints were the most frequently employed (32.7%), while tact constraint violations (32.1%) were the most common within negative strategies. The study utilized repeated measures of ANOVA and Tukey post hoc analysis via SPSS to examine differences among various constraints and their violations. Significant differences were found among most constraints, except for tact and modesty, generosity, and feeling reticence. In terms of constraint violations, no significant differences were observed between approbation and obligation of the speaker to others constraint violation, between agreement constraint violation and generosity constraint violation, between agreement and obligation of others to a speaker constraint violation, between agreement constraint violation and opinion reticence constraint violation, between sympathy and modesty constraint violation, between sympathy and feeling reticence constraint violation. The findings underscore the importance of analyzing language in specific media, providing insights into politeness and impoliteness in a specific medium. The results can enhance students' pragmatic skills and improve their online communication, prompting materials developers to consider such pragmatic dimensions.

The implementation of an effective tax system requires specific conditions, among the most critical being equity and efficiency. Taxation on income must align with the principle of the ability to pay; therefore, governments strive to set tax rates appropriately and impactfully. An disproportionate increase in income tax rates can lead to significant social repercussions on income distribution and public welfare. Consequently, calculating the optimal tax rate to maximize social welfare is deemed essential. This paper models the strategic interaction between taxpayers and the tax authority to achieve an optimal tax rate and identifies the factors influencing this rate. By designing a game among taxpayers, assumed to be uniformly distributed within the interval [0, 1], and evaluating the revenue generation of the tax authority, the paper delves into the game formulation and analyses the results. Findings indicate that the optimal tax rate exhibits an inverse relationship with the assessment rates set by investigating groups. Additionally, under specific conditions, the optimal performance tax rate has been determined to be 18%.

Objective: The tourism sector, a significant component of the global service industry, is vital for a nation’s economic development and income generation. Therefore, it is essential to ascertain the factors influencing the demand for this type of service. The main aim of this study is to examine the impact of exchange rates on tourism demand in Iran. Methods: This study examined the long-term and short-term relationships between Iran’s tourism arrivals and variables such as the exchange rate, political risk, and other factors influencing tourism demand, including inflation, foreign investment, oil revenue, GDP, and population, employing time series data from 1995 to 2024 and the Dynamic ARDL simulation method. Results: The results indicate that political risk significantly detrimentally affects Iran’s tourism demand, whereas the exchange rate has a notable positive influence. Since 2010, when the fourth round of sanctions began, political risk has escalated owing to internal and external conflicts, negatively impacting international tourism demand. Conclusions: The interplay between exchange rate variables and political risk was found to positively influence tourism demand. The increase in the exchange rate decreases the costs of tourism services, and also stimulates creative business endeavors in the tourism industry.

Background: The study of the psychological effects of this viral disease on the mental health of individuals at different levels of society, especially elite athletes, is of great importance.Aim: Present study aimed to investigate the psychological status of elite athletes during the COVID-19 pandemic.Materials and Methods: The statistical population of this study included 87 Iranian elite and national athletes in various sports. The statistical population of this study included 87 elite and national athletes in various sports. Data were collected using the stress, anxiety, depression inventory (DASS-14), perceived stress inventory (PSS-14), the revised event impact inventory (IES-R), and the Graz Emotional Disorders Questionnaire.Results: There is no significant difference between the components of depression, anxiety, event impact, and emotional disorders (P≥0.05). There is a significant difference between the mean scores obtained by elite athletes and the mean scores of the stress component (P=0.01). The mean scores obtained by elite athletes were lower than the mean scores in the perceived stress component (P=0.001).Conclusion: The elite Iranian athletes in the Corona pandemic are in a relatively good psychological state.