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Showing 20 results for Khaleghi
Volume 2, Issue 3 (7-2016)
Abstract
Background: Health care workers (HCWs) are at the risk of the acquisition of occupational transmissible diseases. Controversial results have been reported about hepatitis C virus (HCV). The main objective of the recent study was to evaluate the seroprevalence of HCV and its relationship to the occupational history and exposure of HCWs in two teaching hospitals in Tehran-Iran.
Materials and Methods: A seroprevalence survey of HCV was conducted using serum samples obtained from 1400 HCWs in two teaching hospitals during 2012. The samples were screened by ELISA for the presence of anti-HCV antibodies.
Results: In none of the participants the HCV antibody was detected. Needle stick injury was significantly higher among nurses. Younger HCWs with a shorter professional life had more frequent needle stick injury (p<0.001).
Conclusion: The seroprevalence of HCV in HCWs was considerably lower than that reported in the general population, and needs to be evaluated on a larger scale.
Volume 5, Issue 2 (No.2 (Tome 18), (Articles in Persian) 2014)
Abstract
In second language didactics, language learning strategies have been identified for numerous languages, and factors such as age, gender, motivation, intelligence, as well as the level of language skills for utilizing these strategies have been analyzed. However, in Persian didactics as a second language, no such research has been conducted yet. Therefore, in order to analysis the relationship between nationality and application of strategies among foreign Persian learners, the present research was conducted based on Oxford's (1990) Strategy Inventory for Language Learning. Both inferential statistics and statistical tests showed that on average, the use of language learning strategies among different nationalities is quite similar with negligible variances. Whereas, descriptive statistics showed that the order of priorities of Persian learners of different nationalities is dissimilar. In addition, the results of this research suggest that Persian learners of different nationalities generally use cognitive and social strategies more so than other strategies.
Volume 5, Issue 3 (No.3 (Tome 19), (Articles in Persian) 2014)
Abstract
The current research, taking into account three standards of Beaugrande & Dressler’s textual-cognitive model i.e. cohesion, coherence, intertextuality, explains the four-fold stages of textual perception in Sohrab Sepehrie's poetic collection Zendegi-ye Khwabhâ (Dreams’ Life). The aim of the study is to find a new analytical method of the contemporary poetry that is identified through the text hence; it is a collection of identical and mental processes that gradually ring forth the method of understanding and stages of perception to readers. Based on the above model, this study elaborates on a quadric procedure, consisting of parsing, concept recovery, idea recovery and plan recovery for perceiving Sepehrie’s poetry. Here, “parsing” is achieved through collocation; “concept recovery”, through finding the schema; “idea recovery” through taking a sequence of actions and looking for background knowledge and intertextuality; and finally the “plan recovery” through attachment. In other words, a receiver arrives at sequence of actions following collocations that fills the gap in the text and discovers the poet’s schema through sharing his/her background information with instances of intertextuality. Sepehrie succeeded in expressing his metaphysical experiences in a compact way through repeating and describing a chain schema via appealing to surrealism and mysticism as elements of intertextuality.
Volume 5, Issue 4 (12-2001)
Abstract
Ali Hossein Najafi Abrand Abadi Associate Professor, Shahid Beheshti University Mohammad Jafar Habibzadeh Associate Professor, Department of Law, Tarbiat Modares University Abulfat'h Khaleghi Ph.D. Student of Criminal Law, Tarbiat Modares University The imprisonment (custodial sentences) is the most common and expensive sanction in the criminal law, which has enjoyed hardly any success on the treatment of the offenders due to the complexity of the prison administration. Reform in the prison administration and search for an appropriate alternatives for it, have long attracted the attention of the penologists, it has recently intensified with the appearance of community punishment theory. This theory was designed with the aim of sentencing without unnecessary intervention in the social and emotional relationships of offenders together with protection of public security and welfare. Home detention as a sample of community punishment has reduced incarceration rates and restricted nonviolent criminals and is more compatible with the humanitarian principles.
Volume 8, Issue 2 (2-2019)
Abstract
The efficacy of sex pheromone traps for detection of Cydalima perspectalis (Walker) (Lepidoptera Crambidae) was assessed in 2017 in Cheshmeh-Bolbol Box Reservoir (Golestan province, Iran). Monitoring was done from May to September and three flight peaks were determined. No significant difference was observed between colors as well as heights of installing pheromone Traps for capturing C. perspectalis. The results confirmed the efficiency of pheromone traps in decreasing damages of Box tree moth. Also, best time for chemical and pheromone control was assessed.
Volume 9, Issue 1 (No. 1 (Tome 43), (Articles in Persian) 2018)
Abstract
Learning strategies are amongst the tools that learners use to learn languages. In other words, learning strategies are widely introduced as techniques or methods that students often use to improve their learning skills in second language. Despite the importance of strategies and their role in accelerating and effective learning, few researches have been conducted on the impact of strategies on the success of learners in learning language skills. Also no reliable research has been done so far to study the effect of strategies on the success of non-Iranian Persian speakers. Therefore, due to the impact of using strategies on learning language skills, this study examines the impact of memory, cognitive and compensation strategies on the success of Persian language learners in writing skill. To this end, the following questions were raised:
- Is there a significant relationship between using memory strategies and the success of non-Iranian Arabic language learners in writing skills?
- Is there a significant relationship between using cognitive strategies and the success of non-Iranian Arabic learners in writing skills?
- Is there a significant relationship between using compensation strategies and the success of non-Iranian Arabic learners in writing skills?
- Is there a relation between applying total direct strategies (cognitive and compensation strategies) and the success of non-Iranian Arabic learners in writing skills?
- Is the contribution of using each of the direct strategies the same in predicting the success of non-Iranian Arabic-speaking learners in writing skills?
- Hypothesis 1: There is a significant relationship between using memory strategies and the success of non-Iranian Arabic language learners in writing skills.
- Hypothesis 2: There is a significant relationship between using cognitive strategies and the success of non-Iranian Arabic language learners in writing skills.
- Hypothesis 3: There is a significant relationship between using compensation strategies and the success of non-Iranian Arabic language learners in writing skills.
- Hypothesis 4: There is a relation between applying total direct strategies (cognitive compensation strategies) and the success of non-Iranian Arabic learners in writing skills.
- Hypothesis 5: The contribution of using each of the direct strategies is different in predicting the success of non-Iranian Arabic-speaking learners in writing skills.
Volume 9, Issue 37 (3-2021)
Abstract
Understanding "myth" is very important in understanding society, people's behaviors, and beliefs. We know that myth usually changes throughout history, but it disappears gradually. "The Story of Fereydoun" is considered as one of the most important stories of Iranian myths and researchers have traced its mythological roots to the Avestan period, Vedic texts, and the myths of birth and battle of the demon of land. The god of rain is mentioned in this story as well. On the other hand, there are myths and stories among people that contain mythical themes, symbols and signs in various forms, and the study and analysis of these myths in tracing the origins of the mythical elements of society plays an important role. One of these popular stories is "The Story of Shahzid", one of the Imamzadehs of Amol city of Mazandaran, which has many similarities with the story of Fereydoun in its narrative structure, semiotic elements, and mythical symbols. In this article, these two stories are examined and analyzed together, and their mythological elements are identified. It was concluded that the two stories, there are some similarities in some events and symbols of the myths such as: cow, tree, forest, snake, healing drink, witchcraft and geographical location. Both stories originate from a source which is the "myth of birth" and the war between the god of rain and the demon of land.
Introduction
Some studies have been done on the mythical story of Fereydoun and its comparison with mythology, but they are not comparative with regards to a story from the post-Islamic period and Islamic myths.
The main question of the research is whether a connection can be found between the story of the myth of Fereydoun and the story of Imamzadeh Shahzid. Could this connection be based on a myth?
In addition to Shahnameh's narration of Fereydoun's story, the summary narration of the people of Mazandaran is that: Fereydoun's mother hides him in the forest in a crack of an old tree when he is born. Every day, the cow goes near the tree and Fereydoun, the child, drinks milk from the cow. The owner of the cow notices and takes the child with him. "The cow loved Fereydoun and allowed Fereydoun to ride him."
Zayd ibn Musa ibn Ja'far is one of the Imamzadehs of Amol. Imamzadeh, fleeing from the enemies to the south of Amol, takes refuge in an old tree in a mountainous and forested area. The cow is commanded by God to go to the tree every day so that the gentleman can milk it. Galesh notices and strikes him with an ax and runs away. The prince curses Galesh and the ranch is stoned with all the cows. The Galesh family is also displaced. According to the story, the prince was a four-year-old child.
It is said that the servant of Astana Shahzid seeks water on the way during prayers to perform ablutions. At the same time, a pitcher and rosary descends on him from the sky. Saif performs ablution from the water of the pitcher and prays next to the rosary. The pitcher disappears, but the rosary is removed safely, and whenever the disease comes, the rosary is put in some water and the rosary water is drunk by the patient. According to the villagers, there are two green snakes with a cockatiel on the guard of Shahzid threshold, its spring, atmosphere, and water reservoir.
Mythical elements
Cow: Cow has been one of the ritual animals in ancient Iran. In the story of Fereydoun and Shahid, the main point is milking a cow, which goes back to the "mother goddess" of cows and raising humans. Since the prince emerges from the crack of the tree, it can be a symbol of the womb that is associated with the tree as the mother goddess. Cow is also closely related to rain and water in mythology. The myth of the god of clouds and rain can be deduced from it according to the myth of Indra and Trita Aptie.
In Dinkard, Fereydoun turns the Mazandaranis into stones. At the command of Ormazd, he firmly binds Zahak like a stone in a cave and achieves happiness and kingship, and the Imamzadeh of Shahzid stones the cattle ranch and cows.
The village of Shahzid is located on the border between the forest and the mountains without trees. In other words, the rainy clouds of the north remain behind the Alborz mountains in this region and collide with each other.
Forest and tree: "In mythology, the forest is a psychological realm having a feminine origin, the place of examination and knowing the unknown dangers and darkness, and the entry to the dark or symbolic haunted area" (Cooper, 2013, p. 110). The relation of forest with fertility, rain, and water could be another confirmation of the main roots of the myths in these two stories.
Snake: "Snakes guard the thresholds and temples, and all the gods depend on them. The two snakes represent the contradictions in the duality that eventually lead to unity" (ibid., p. 349). In the story of Fereydoun, a snake has grown on Zahak and makes him a demonic creature. "According to a version, Fereydoun was a three-headed snake that overcame another three-headed snake, namely Zahak" (Shamisa, 2015, p. 261).
Some scholars consider the word Fereydoun to mean having three spiritual, physical, and medical powers. These three attributes can be found to some extent in Imamzadeh Shahzid: having the spirit of a fighter and purity, being a master and fighting enemies, the symbolic tool of iron with changes in the Galesh's ax, the rosary's medical potentiality and the healing power of the water, and the magical ability in stoning cattle.
The title of Shah, which is used in the Iranian culture for Imams, their sons, and the Sufi followers is remarkable so far as the mythological semiotics is concerned, and it can be analyzed with regards to the story of Fereydoun.
References
Introduction
Some studies have been done on the mythical story of Fereydoun and its comparison with mythology, but they are not comparative with regards to a story from the post-Islamic period and Islamic myths.
The main question of the research is whether a connection can be found between the story of the myth of Fereydoun and the story of Imamzadeh Shahzid. Could this connection be based on a myth?
In addition to Shahnameh's narration of Fereydoun's story, the summary narration of the people of Mazandaran is that: Fereydoun's mother hides him in the forest in a crack of an old tree when he is born. Every day, the cow goes near the tree and Fereydoun, the child, drinks milk from the cow. The owner of the cow notices and takes the child with him. "The cow loved Fereydoun and allowed Fereydoun to ride him."
Zayd ibn Musa ibn Ja'far is one of the Imamzadehs of Amol. Imamzadeh, fleeing from the enemies to the south of Amol, takes refuge in an old tree in a mountainous and forested area. The cow is commanded by God to go to the tree every day so that the gentleman can milk it. Galesh notices and strikes him with an ax and runs away. The prince curses Galesh and the ranch is stoned with all the cows. The Galesh family is also displaced. According to the story, the prince was a four-year-old child.
It is said that the servant of Astana Shahzid seeks water on the way during prayers to perform ablutions. At the same time, a pitcher and rosary descends on him from the sky. Saif performs ablution from the water of the pitcher and prays next to the rosary. The pitcher disappears, but the rosary is removed safely, and whenever the disease comes, the rosary is put in some water and the rosary water is drunk by the patient. According to the villagers, there are two green snakes with a cockatiel on the guard of Shahzid threshold, its spring, atmosphere, and water reservoir.
Mythical elements
Cow: Cow has been one of the ritual animals in ancient Iran. In the story of Fereydoun and Shahid, the main point is milking a cow, which goes back to the "mother goddess" of cows and raising humans. Since the prince emerges from the crack of the tree, it can be a symbol of the womb that is associated with the tree as the mother goddess. Cow is also closely related to rain and water in mythology. The myth of the god of clouds and rain can be deduced from it according to the myth of Indra and Trita Aptie.
In Dinkard, Fereydoun turns the Mazandaranis into stones. At the command of Ormazd, he firmly binds Zahak like a stone in a cave and achieves happiness and kingship, and the Imamzadeh of Shahzid stones the cattle ranch and cows.
The village of Shahzid is located on the border between the forest and the mountains without trees. In other words, the rainy clouds of the north remain behind the Alborz mountains in this region and collide with each other.
Forest and tree: "In mythology, the forest is a psychological realm having a feminine origin, the place of examination and knowing the unknown dangers and darkness, and the entry to the dark or symbolic haunted area" (Cooper, 2013, p. 110). The relation of forest with fertility, rain, and water could be another confirmation of the main roots of the myths in these two stories.
Snake: "Snakes guard the thresholds and temples, and all the gods depend on them. The two snakes represent the contradictions in the duality that eventually lead to unity" (ibid., p. 349). In the story of Fereydoun, a snake has grown on Zahak and makes him a demonic creature. "According to a version, Fereydoun was a three-headed snake that overcame another three-headed snake, namely Zahak" (Shamisa, 2015, p. 261).
Some scholars consider the word Fereydoun to mean having three spiritual, physical, and medical powers. These three attributes can be found to some extent in Imamzadeh Shahzid: having the spirit of a fighter and purity, being a master and fighting enemies, the symbolic tool of iron with changes in the Galesh's ax, the rosary's medical potentiality and the healing power of the water, and the magical ability in stoning cattle.
The title of Shah, which is used in the Iranian culture for Imams, their sons, and the Sufi followers is remarkable so far as the mythological semiotics is concerned, and it can be analyzed with regards to the story of Fereydoun.
References
Cooper, J. S. (2013). Culture of ritual symbols (translated into Farsi by Roghaye Behzadi). Scientific.
Kazazi, M. J. (2011). Dream, epic, myth (in Farsi). Markaz Publishing.
Shamisa, S. (2015). Expression (in Farsi). Mitra.
Shamisa, S. (2015). Expression (in Farsi). Mitra.
Volume 11, Issue 2 (Vol. 11, No. 2 (Tome 56), (Articles in Persian) 2020)
Abstract
integrative and instrumental motivation as well as Ideal self and Ought-to self on the motivation and success of language learners, the present study has investigated these issues among the learners in Persian language. For this purpose, 20 Korean and Chinese students (10 Chinese and 10 Korean students) were selected from the Persian language teaching center of Ferdowsi University of Mashhad. Thus, the statistical sample of the study consisted of 20 Persian-Chinese students and Korean men and women (8 men and 12 women) who were in the age group of 18 to 30 years and in the academic year 2016-2017.
It is also worth mentioning that these Persian students have reached an advanced stage in this center, from the introductory course of Persian language. The Farsi students responded to a 36-item questionnaire based on the Dornyei Motivational Questionnaire (2010). Finally, the data were analyzed using SPSS software. six hypotheses were proposed and we used statistical tests to examine the hypotheses. First, the normality of the research variables was examined and the results showed that these variables have a normal distribution. Therefore, as mentioned, in the next step, we examined the research hypotheses. The results of the study showed that there is a significant difference between Ought-to selves of Korean learners and Chinese or Japanese tutors. However, there is no meaningful difference between Ought-to selves of Japanese and Chinese learners. There was a significant difference between Korean, Chinese and Japanese Ideal selves. In addition, there was no significant difference between the Chinese, Korean, and Japanese learners’ promotional instrumental motivations. While there was a significant difference between preventive instrumental motivation of Japanese learners and Chinese or Korean ones. And there was no significant difference between Chinese and Korean. The results of the research suggest that there is a significant difference between integrative motivation of the Chinese, Korean and Japanese learners. There was no meaningful relationship between integrative motivation of Chinese, Korean and Japanese students and their Ideal selves. There was a significant negative correlation between ought-to self and preventive instrumental motivating of Korean students, while there was no significant relationship between these two variables in Japanese and Chinese students.
In addition, a comparison of the meanings of all four motivational factors in these two groups of Persian-learners showed that, in general, in these two groups of Persian-learners, the Preventing Instrumental motivation was with the highest average, and the Ought-to self motivation has the lowest average. Also, the comparison between the motivational factors of Ideal self and Ought-to self indicates that in these two groups of Persian-learners, the Ideal self factor is stronger than Ought-to self. Comparison between the motivational factors of integration and instrumentation also showed that the Preventing motivational factor is stronger than the integrative factor and the integrative factor is stronger than the promotional instrumental factor.
Finally, it should be noted that the present study focuses only on Chinese and Korean Persian learners; for this reason, it is suggested that in future studies, Persian learners of other languages be examined. In addition, it is suggested that other motivational factors related to second language learning regarding non-Iranian learners of Persian, be examined separately and compared with each other. In this case, how to teach and use educational resources can be planned according to the type of related motivation.
Volume 12, Issue 2 (Summer 2022)
Abstract
Aims: To counteract urban population growth, research centers have devised city development strategies as well as the concept of intelligent cities. The present study aims to examine how building information modeling (BIM) and geographical information system (GIS) can be integrated to establish principles that govern intelligent cities and enhance their efficiency. It also delineates the potential advantages of BIM and GIS integration for future developments in various other areas.
Methodology: Taking advantage of a meta-synthesis methodology, this study has researched the concepts of BIM and GIS in Farsi and English databases, identifying knowledge gaps in previous studies, while examining their integration for the purposes of this project.
Findings: Considering the distinct qualities of BIM and GIS, it is essential to integrate the two models in a three-dimensional environment, as their effective synergy must be supported by a viable platform. Our findings confirm that by undertaking CIM models, city managers and the construction sector can significantly enhance intelligent cities. Furthermore, to improve productivity and achieve sustainable management, BIM and GIS data should be used at different levels of semantic models.
Conclusion: Managerial issues concerning vertical construction cannot be resolved by using two-dimensional data available on maps. The integration of BIM and GIS can, however, effectively solve managerial problems in infrastructure development projects – both horizontal and vertical. The integration of these two models provides sustainable support for an intelligent city in that both models have distinctive capabilities for data unification, quantitative analysis, technology applications, and city management.
Volume 12, Issue 6 (January & February 2022 2021)
Abstract
There has been a growing interest in class-related motivational research since 1975, and many studies have been conducted on a variety of motivational models. The present study, on the base of Dornyei Motivational self-systems (2005) and the history of research related to the motivation for learning a second language such as Gardner (1985), Clement (1980), and Clement and Kruidenier (1985), Taguchi (2010) , Papi (2010) Magid (2011), examines 16 motivational along with the effect of gender, age, and student’s degrees variables on Persian language learning motivation among non-Persian students For this purpose, 300 non-native Persian learners (women and men of different nationalities and educational levels) aged between 18 and 50 from the Persian language teaching centers of Ferdowsi University of Mashhad, Imam Khomeini International University in Qazvin , and Tehran University of Medical Sciences, responded to a questionnaire with 16 factors(92 items). Validity and reliability of the questionnaire were evaluated and verified using PPL software. The results of the study showed that all 16 proposed components had a significant effect on the learner's motivation. Also, the motivational factors, in terms of rank, do not have the same effect on the motivation of non-native Persian learners. In addition, the results showed that women and men differ in their motivational factors. It was also found that older age groups are more likely to be motivated than younger ones. There was a significant relationship between educational level and some motivational variables.
Volume 15, Issue 1 (1-2008)
Abstract
Political legitimacy is one of the fundamental notions in contemporary political theorizing. To explain this notion, a set of views, influenced by Weber, put emphasis on the role of political beliefs of the citizens. Yet, recent academic enterprises refer to the political agents, focusing on their actions. This article studies Iranians’ socio-economic conditions in 1990’s, and reveals the setting of the emergence of the reformism, with regard to the notion of legitimacy. Along this line, the strategy of the reformists as the political agents is examined and their weaknesses and strengths as well as the reason of their failure are discussed.
Volume 15, Issue 3 (Fall 2011)
Abstract
There has long been no compromise between the experts about an important subject such as public regularity. In spite of the high importance of public regularity concept in ordering the legal system and also confining legitimate rights of citizens and exposure of legal return, according to contravention, passing or deviation from it. Hence, two different proponents and opponents have tried to prove their own beliefs against each other according to applying reasons and each of them has offered some logics about their own rightfulness. The authors regarding the parties’ reasons, necessary pillars and criteria about this idea believe that, since in all topics related to public regularity, the target is to avoid doing any task, there identifying and defining the concept of public order is an important issue which cannot be overlooked easily. Authors defend a doctrine with different reasons that needs and necessitates presenting a definite description. It is also emphasized to explain this concept and remove the existing challenges need endeavor of legislators and lawyers in illustrating profits and social benefits as an undeniable subject.
Ahmad Khaleghian, Behnam Dadashzadeh,
Volume 15, Issue 13 (Special Issue 2016)
Volume 15, Issue 13 (Special Issue 2016)
Abstract
Volume 16, Issue 1 (12-2024)
Abstract
Blood pressure monitoring is a vital component of maintaining overall health. High blood pressure values, as a risk factor, can lead to heart attacks, strokes, and heart and kidney failures. Similarly, low blood pressure values can also be dangerous, causing dizziness, weakness, fainting, and impaired oxygen delivery to organs, resulting in brain and heart damage. Consequently, continuous monitoring of blood pressure levels in high-risk individuals is very important. A Holter blood pressure monitoring device is prescribed for many patients due to its ability to provide long-term and valuable blood pressure data. The pursuit of software techniques and the development of cuffless blood pressure measurement devices, while ensuring patient comfort and convenience, are among the significant challenges that researchers are focusing on. In this study, a deep learning framework based on the UNet network is proposed for continuous blood pressure estimation from photoplethysmography signals. The proposed model was evaluated on the UCI database, involving 942 patients under intensive care, and achieved mean absolute errors of 8.88, 4.43, and 3.32, with standard deviations of 11.01, 6.18, and 4.15, respectively, for systolic, diastolic, and mean arterial blood pressure values. According to the international BHS standard, the proposed method meets grade A criteria for diastolic and mean blood pressure estimations and grade C for systolic blood pressure estimation. The results of this study demonstrate that the suggested deep learning framework has the necessary potential for blood pressure estimation from PPG signals in real-world applications.
Seyed Majid Khatibi, Ali Khaleghi, Mahmood Norouzi,
Volume 17, Issue 9 (11-2017)
Volume 17, Issue 9 (11-2017)
Abstract
In this paper, the viscous fingering instability in miscible Newtonian fluid displacements is studied experimentally. Studying the results of this instability have widely application in oil extraction from ground bed oil reservoirs to the ground surface. In order to be more actualized results, a porous media with transparent walls and compact structure of spherical glass beads is constructed, that have close permeability to ground bed. The main purpose of this study is to investigate the effects of viscosity ratio, flow rate and Blake dimensionless number on the quality of growth and the shape of the fingers, also their effect on important physical parameters including the mixing length, sweep efficiency and noise growth to base state. The results showed that with increasing the viscosity ratio, instability and number of finger branches increases and more tiny fingers are formed. Also, increasing the viscosity ratio increases the mixing length and decreases the sweep efficiency. Likewise, with increasing the flow rate, it was observed that the number of wide fingers Increased and fingertips tend to spread. Furthermore, by studying the results it was found that increasing the flow rate, increases the sweep efficiency, but have No tangible effect on the mixing length. Also, the results show that increasing the Blake decreases the mixing length and increases the sweep efficiency.
Volume 17, Issue 99 (May 2020)
Abstract
Background and Aim:
Oxidative stress factors are known to causes some metabolic disorders diseases. Therefore, preventing, or at least decreasing the amount of these factors may have a positive impact on prevention or improvement of the metabolic diseases. Recently, the herbal medicines are more considered due to more effectiveness. The present study was designed to evaluate anti-oxidant effect of sumac powder (Rhus coriaria L.).
Materials and Methods:
In the present study, special parts of the sumac plant, dried at room temperature and powdered using laboratory mill. All samples were solubilized in methanol, and four concentrations (12.5, 25, 40 ،50 µ/ml) were prepared and the antioxidant activity of sumac powder measured by DPPH at a wavelength of 517 nm. Finally, the IC50 of all samples and the standard were calculated and compared with standard.
Results:
The methanol extracts of all sumac doses showed dose-dependent potent antioxidant activity. The results indicated that brown sumac powder (IC50 = 14/912) has the higher antioxidant activity compared to red sumac powder (IC50 = 27/385), which was lower than vitamin C (IC50 = 6/708).
Conclusion:
Brown sumac powder has a stronger antioxidant effect than red sumac powder, which can be effective in improving the antioxidant defense of the body, so we advise to consume brown sumac.
Volume 18, Issue 1 (may 2018)
Abstract
Due to population growth and land scarcity, especially in big industrial cities, many ground improvement projects are required annually for new developments. Moreover appropriate ground improvement techniques are also required to encounter dust storms and desert expansion which are common environmental problems in many countries. Thus looking for more efficient and comprehensive methods in the field of soil improvement seems to be an essential necessity. Although a lot of improvement techniques are in use around the world, they have their own advantages and disadvantages. Chemical, physical, mechanical, biological and electrical techniques may be named as the common methods of soil improvement. Some of the methods, particularly those using cement and other toxic chemical grout, may cause environmental problems which limit their usage. The biological stabilization seems to be a promising technique to control the expansion of dune sand deserts and in turn encountering the problem of dust storms. This paper reports the likely potentials of application of biological treatment on dune sand samples taken from Kerman deserts. As an environmental friendly method, biological improvement presents an innovative, novel technique in which microorganisms present in the natural soil are employed to initiate biochemical processes leading to deposition of calcium carbonate. This procedure bonds soil particles to each other and improves soil physical and strength properties. Microbial-induced calcite precipitation (MICP) is an innovative technique that harnesses bacterial activities to modify geotechnical properties of soils. In microbial-induced carbonate precipitation method, urea is hydrolyzed by bacteria and calcium carbonate precipitate is formed by a network of biochemical reactions. The bacteria acts as a biochemical reaction network controller and so power supply of bacteria is very important. Nutrients needed by the bacteria are CO_2,N,P,K,Mg,Ca,Fe generally. In this research study a hybrid microorganism was prepared in the laboratory and injected into cylindrical sand samples of 100mm length and 47mm diameter. In this context, mixed culture performance was compared with that of single culture bacteria in terms of the treatment efficiency regarding strength enhancement of dune sand samples. Sporosarcina urea bacteria was used as single culture and Sporosarcina urea+Bacillus subtilis were used as hybrid culture. Cementation solution by dissolving 1 mole of urea and 2 moles calcium chloride per liter of distilled water were prepared. Unconfined compression test results as an indicator of the strength properties showed that the microbial-induced carbonate precipitation method increases the unconfied strength of samples. Unconfied strength of the improved samples by single and mixed culture were obtained 527.7 kPa and 771.8 kPa, respectively, that these amount is 16.6 and 23 times of unconfied strength of sandy samples. Falling head test results as an indicator of the physical properties showed that the microbial-induced carbonate precipitation method decreases the permeability factor of samples. Permeability factor of the improved samples by single and mixed culture compared to sandy samples has decreased 50.5% and 60%, respectively. increasing unconfied strength and decreasing permeability factor of improved samples by mixed culture to single culture is for this reason that Bacillus subtilis increases urea hydrolysis rate and the rate of precipitation of calcite. Finally precipitated calcium carbonate has been shown by SEM.
Volume 21, Issue 4 (Winter 2017)
Abstract
This research seeks to an analysis of mental indices effective on quality of life in rural areas and, therefore, current research is practical and in terms of research method, is a descriptive-analytical. Research population is rural households in Sinai District of Varzeghan County and sample size according to modified Cochran formula is 266 households. Main dimensions in the analysis of quality of life mental indices were examined in the framework of economic, social, health and physical dimensions tested by PLS in four stages. The results of the first stage show that, used indices have high reliability and validity. In the second stage in models structural test, according to T statistics about external relation among hidden variables, impacts of all indices are proved. In third stages and quality examining of measurement and structural models, calculated values are acceptable at the upper limit and in the result; assessment model has good quality. Finally, in the fourth stage, the general model of the structural test was considered. The GOF index of this model is estimated at 0.685, which is indicating the overall utility of the model. The existence of a positive and strong relationship between the measured indicators and the quality of life of the rural community show that health-social dimension, are key indices for measurement of quality of life in case study rural area
Volume 23, Issue 2 (3-2021)
Abstract
Box tree moth, Cydalima perspectalis (Walker, 1859), is one of the major destructive pests that feed on the leaves and shoots of various Buxus species. In the course of this survey, the life cycle of C. perspectalis was studied in laboratory and natural (Hyrcanian Forests) conditions. The laboratory experiments were carried out at temperature of 25±1ºC, 70±10% relative humidity and a photo phase of 16 light: 8 dark hours. The average duration of an egg, larva, pre-pupa, pupa, as well as female and male longevity were 5.09±0.04, 23.15±0.17, 1.04±0.02, 7.80±0.05, 15.31±0.73 and 12.92±0.71 days, respectively. As an important pest newly introduced in northern Iran, the Box tree moth completes two and partial third generations per year. The results of this study would be useful for improving pest management strategies.
Volume 26, Issue 2 (3-2024)
Abstract
Citrus is one of the most important fruits whose growth performance and production is significantly affected by environmental stresses. Abiotic stresses, such as salinity and alkaline pH, strikingly limit citrus growth and development. The aim of the present study was to investigate the effect of four NaCl concentrations (0, 30, 60, 90 mM) and two pH levels (6.5 and 8.2) on some of morphological, physiological, and biochemical parameters of two citrus rootstocks (Sour orange and Bakraei rootstocks). The experiment was conducted as factorial based on a completely randomized design with four replications, at the Faculty of Agriculture, Shahid Chamran University of Ahvaz, Iran. The results showed that the value of shoot dry weight, fresh and dry weight of roots, and transpiration were significantly decreased in both Bakraei and Sour orange rootstocks when receiving irrigation with 90 mM supplement of salinity at pH= 8.2. Proline and carbohydrates of citrus rootstocks were considerably increased by increasing the levels of salinity (90 mM NaCl) and alkaline stress (pH= 8.2) in each rootstock, at which condition the photosynthesis rate of Sour orange and Bakraei also declined by 34.77 and 50.80%, respectively. The activity of antioxidant enzymes such as peroxidase, catalase, and superoxide dismutase were increased by 57.42, 42.10, and 45.86% in Sour orange rootstock and 42.04, 26.78, and 37.92% in Bakraei rootstock, respectively. Overall, it can be concluded that the growth performance of Sour orange rootstock is more suitable than Bakraei to tolerate salt-alkali conditions.
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