Background and Objective: The aim of this study was to measure the shear bond strength of composite resin to human dentin surface bonded with three different bonding systems.Subjects and Methods: The crown surface of 66 extracted human third molar teeth were abraded with trimer in a wet environment until the dentin surface was exposed, and they were polished with silicon carbide paper 400 and 600 grit. Then, all the smooth smear layer samples were randomly classified into three equal groups. We used bonding according to the instruction of the manufacturer (the first group Single Bond, the second group BC Plus and third group Charm Bond).Then, the composite resin was bonded to the tooth surface by plastic tube (diameter: 1.8 mm, height: 5mm).Finally, shear bond strength was determined by universal testing machine (LMT 100).Results: The variance analysis (ANOYA) P value=0.000 revealed the mean of shear bond strength is different between three groups. The mean shear bond far first, second and third groups are 15.25 MP, 6.84 MP, 8.59 MP, respectively. The multiple comparison with THKEY test showed that there is different significance between group one and the other two groups which did not differ significantly.Conclusion: All in all, we found out that greatest shear bond strength to dentin is the American Single Bond, which is better than Korean product (BC Plus and charm Bond).

Multiregional economic models that present a set of regional economies in a continuous manner and show cross-regional interactions require calculating the export of each region to other regions and import of each region from other regions. In the process of survey inter-regional relations and creating multi-regional input-output, the missing link is the estimation of inter-regional trade. In this study Iran was divided into nine regions, and using the CHARM method and Gravity model with the aim of estimation of regional and inter-regional trade, the total volume of trade between the two regions and the trade of each part of the region was calculated with other regions. Accordingly, the total volume of Iran’ s interregional trade is 858. 133 billion rials. The interregional trade about regions that are geographically located in the center of the country are higher than the non-central regions of the country, such that the highest volume of interregional trade is related to the Alborz Jonubi region with the volume of 173, 637 billion Rials and the smallest volume of interregional trade related to the Azarbayjan area with the volume of 68. 392 billion Rials. The largest volume of interregional trade, in the Costal-North area is in the agricultural sector, the Azerbaijan region is in the industrial sector, the Zagros region is in the agricultural sector, the Khuzestan region is in the mining sector, the Fars region is in the industrial sector, the Alborz region is in the service sector, the Central region is in the Industry sector, the South-East region is in the industry sector and in the Khorasan region is in the Service sector. In addition, the international trade of the regions was estimated by sector, and with combining the results of the regional and international trade estimates, policy recommendations were presented for each region.

Since antiquity the curious mind of man was in search of stars to know his fate and destiny. The inhabitants of the Earth looked also at the stones and metals.  Beads, precious and semi precious stones with their special colours and magical effects like happiness, unhappiness, charm, keeping the evil forces ie the evil eye at bay and increasing fortune, have preoccupied the mind of man.  Hence the present article is an attempt to search in the old middle texts (Pahlavi and Soghdi) and Islamic texts in order to find a trace of beads in ancient Iran.  Texts in which the characteristic magical properties of beads and the connection of some of them with stars has been described in such a way that perhaps one could introduce the universe as to the source of these Earth beads.Next, the properties of beads and a sample of the wonders of hexagonal beads with colours green, red, blue, yellow, black and violet based on Islamic sources of mineralogy are given.  Finally by correlating the beads with Shahnameh, we have spoken about the strong belief in this ancient legacy in the popular culture of what is known as the symbolic imagery of natural phenomena translated into a palpable and visible language.

The purpose of this research is to investigate the role of brand attraction in identifying a customer brand on aviation. The instrument for measuring data in this research is a standard questionnaire which has been analyzed using the LISREL software. In order to analyze the research data, a structural equation model has been used to confirm or reject the research hypotheses. The findings show that brand prestige, brand distinction and memorable experiences have a positive and significant effect on brand attractiveness. has it. The brand's charm and brand distinction have a positive and significant effect on brand identification. But, contrary to expectations, the brand's social benefits do not have a significant effect on the attractiveness and identity of the brand. Also, prestige and brand wisdom experiences do not have a significant effect on brand identification. In general, the results indicate that brand attractiveness is not just about building trust in aviation brand management, but also considering the importance of direct impact And its intermediary on customer identification is an important construct in understanding how customers are developing brand communication.

An interregional input-output analysis can illustrate the full picture of trade between regions at the economic sect oral levels. This analysis is due to the availability of an interregional input-output table (IRIO). Since the IRIO tables are not provided by an official institution in Iran, in the regional input-output literature, it is necessary to use no survey methods. In this regard, the main objective of this paper is to estimate the trade between two major provinces, Tehran and Isfahan in order to prepare a two-region IRIO table that the sum of which is not the national economy. This table can measure not only the trade between the regions but also prepare the international trade in the above areas. The main data bases of the research are: The National Statistical Input-Output Table of 1390, and the regional accounts of Tehran and Isfahan provinces at the level of 72 economic sectors from the Statistical Center of Iran, which have been aggregated in to 9 sectors to describe the results. Findings indicate that, Isfahan province’ s imports from Tehran is 5 times of Tehran province’ s imports from Isfahan. The greatest value of sect oral import of the two regions belongs to other manufacturing sectors. The value of total trade between Tehran and Esfahan is 546 and 551 trillion rails respectively. The highest international sect oral imports and exports of the provinces of Tehran and Isfahan are related to the manufacture of various chemicals, metals, minerals, machinery, equipment and tools sector and other manufactures. The calculation of the import coefficient shows that the highest import coefficient of Tehran province from Isfahan is 0. 039 and the highest import coefficient of Isfahan province from Tehran is 2. 439 and both are in the section "other manufacture" of industry.

Created on a social network basis, Instagram pages effectively contribute to shaping our mental perception regarding various topics. On the other hand, those Instagram pages dedicated to travel have highly been welcomed by viewers in recent years. Actually, the representations made by the relevant influences concerning the travel process, travel destination, and travel meaning construct some explicit and implicit meanings. Therefore, this study sought to identify the semantic system governing the popular Instagram pages of travel influencers. The conceptual framework of the study is based on John Fisk's semiotic approach and his social reality codes, including social reality, representational reality, and ideological reality. Social reality codes address physical characteristics such as speech, environment, and clothing. Moreover, representational reality codes deal with the sender's creative power, including framing, colors, companionship and substitution, and characterization. Finally, ideological reality codes examine the concept that gives coherence to such categories. The findings of the study indicated that naturalism, intimacy, liberation in social relations and individual lifestyle, availability and ease of travel, charm-seeking, desire for freedom, travel as a lifestyle, and responsible travel are the pivotal values represented by travel influencers at the level of ideological codes, representing such a special type of tourism that seeks changes in daily routines, acquisition of new experiences, the quest for authenticity, and returning to the true self. This travel style represents a conscious or non-conscious effort against the homogenization of the modern world and a kind of resistance against daily routines, rationalization, and social order.

Tendency to superstitious and using Talismans and spell was common in Qajar Era. Yet this issue was more, or fundamentally, defined as a feminine phenomenon. This kind of view had some roots and sources as well as some effects and results. This paper is going to study its roots and results and ask why and how it exited. It seems that the main reason for defining superstitious as a feminine phenomenon is the superiority of men in comparison with women in Qajar Era. Women usually were considered as weak and powerless creatures. The result of this thought was a kind of women-phobia. This phobia naturally made a condition in which women deprived of their rights to participate in the Constitutional Revolution parliament election. In the middle of Qajar Era, some of Iranian reformists found a meaningful relationship between social lagging and Iranian women lagging. They tried to show the social and historical roots of society problems, like women problems, and challenge the old and traditional thoughts and open a new route for reform in Iran.

As estimating Survey-based regional input-output table is costly, researchers tend to use non-survey based methods instead. In this paper, using two non-survey based methods, i. e. CHARM and AFLQ, input-output table of Khuzestan province is estimated. The CHARM method provides the possibility of estimation of export, cross-hauling and degree of heterogeneity while AFLQ method considers adjusted of regional size and specialized sector. Furthermore, the results show that according to backward and forward indicators, sectors ranking is completely different. In CHARM method and based on backward linkage, basic metals and based on forward linkage other mines are leading, but in AFLQ method, rubber and plastic and electricity are leading according to backward and forward linkages.