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Ghobadi. H. A. , PH.D.

Abstract:
 
This research tries to examine in details tales of two Iranian and Indian epics, namely Shanameh and Mahabaharat aimed at revealing their structures similarities and limitation in plan and extremes. Therefore, some parts of these tales having the subjects of "Killing Relatives" and "Offending Relatives" have been selected to be analyzed structurally.
The reason for such a selection is lack of such a research in the field of epic as most of the researches in this area are interpretive. Structural analysis is an introduction to interpretive one. It is why some structuralists (G.Genet, for example) have considered the issue more important than a mere structural analysis and refer attached importance to interpretation.
The reader of the paper will find out that these tales are similar in content in addition to their structures.
 
 

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Research subject: Polymer nanofibers have attracted much industrial interest over the past decade. In general, these fibers are suitable for a variety of applications including medical applications, insulation, capacitors, advanced aerospace technologies, and so on. Specifically in aerospace technology, the used materials must be thermally stable with suitable electrical conductivity. However, many of these polymer nanofibers suffer from low temperature degradation and low electrical conductivity, limiting their use in many potential applications. Graphite has unique properties such as high conductivity and high thermal stability. This exceptional material can be included as a nanoparticle in polymer nanofibers to modify electrical and thermal properties.The aim of this research was to investigate the effect of addition of graphite nanoparticle on thermal and electrical propertiesof polymer fibers.
Research approach:  For this purpose, polyvinyl alcohol 72000 (PVA) as a non-conductive polymer and graphite nanoparticles were used. Polyvinyl alcohol-graphite nanofibers were synthesized method by electrospinning technique under optimized parameters. The optimum conditions for the electrospinning process were: PVA concentration of 8%, applied voltage of 22 Kv, flow rate of 10 ml and tip/collector distance of 20 cm.
Main results:  Scanning electron microscopy (SEM) studies showed that produced PVA fibers were smooth, continuous without any bead, with a diameter of about 350 nm. The PVA / graphite nanofibers were also smooth but much thinner (about 200 nm) than PVA fibers at the same processing parameters. Moreover, X-ray patterns of PVA/graphite nanofibers include peaks of graphite particles in the structure and slso the suppression of crystallinity.  According to the results of 4 point probe teste, by increasing weight percentage of graphite in the fibers, electrical conductivity increased up to 0.5 . The thermal behavior of PVA nanofibers after mixing with graphite was also investigated by differential calorimetry analysis (DSC) and TGA. It was demonstrated that PVA / graphite nanofibers are thermally stable up to 300 ° C.

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Abstract: Poetical theory is a methodical discussion about works the nature and instrument of which are language. Mohammad Taqi Bahar (Malekoshoara) and Ebrahim Abdolqader Mazani explained their poetical theory in a period when there was an intensive struggle between tradition and modernity in all sections and fields. Both of them, as the effective members of an outstanding literary movement (Daneshkade association in Iran and Jama'ate Divan in Egypt), played a role in explaining their poetical theory and the movement they belonged to. The present study can pave the way for literary analysts to compare the conditions of literary movement in different lands. It also provides an exact and scientific analysis of the philosophy of their success in one land and their failure in another land (or at least ups an downs of their movement in literary limits of different nations). So it compares poetical theory of Mohammad Taqi Bahar (Malekoshoara) and Ebrahim Abdolqader Mazani. After extracting and classifying the ideas of Bahar and Mazani about definition of poetry methodically, and about the position and function of poet and address in creating a poem and its content, poetical theory of these two are compared and explained. It is clarified that both of them have paid attention to poetry function rather than to its structural aspects. From the intellectual aspect, Bahar is more introvert but Mazani is extrovert. It should be mentioned that the function of European literary works and also taking effect from European literary schools is evident in Mazani poetic theory. In general, it can be said that Bahar is more traditionalist and Mazani more modernist.

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Research Subject: The conversion of carbon dioxide into hydrocarbons is a potential process that can reduce and control greenhouse gases. According to the United Nations Development Program's sustainable development goals, liquefied gas is an environmentally friendly fuel. Hydrogenation of carbon dioxide over a suitable catalyst can be used directly to synthesize light hydrocarbons.
Research Approach: This study investigated the direct synthesis of liquefied petroleum gas from carbon dioxide hydrogenation using SBA-15 catalyst modified with copper and zinc nanoparticles. In this study, hydrogen and carbon dioxide were used as reactant gases, and the operation conditions such as reaction temperature and residence time were evaluated.
Main Results: The results showed that by modifying the catalyst with copper and zinc active sites, the active surface of the catalyst was reduced to 542 m².g^-1. Furthermore, SEM results revealed that the addition of metal oxides ZnO and CuO resulted in uniform distribution in the internal channels of the 1Cu1Zn/SBA-15 catalyst, with no aggregation. LPG production is optimal at a temperature of 360 ^oC and a residence time of 10 g.h.mol-1. These conditions yielded a CO₂ conversion rate of 24.6% and a LPG selectivity of 64.8%, respectively. The amount of LPG produced increases as the temperature rises, and after reaching the optimum temperature, there is no significant increase in the amount of LPG produced. The percentage of CO2 conversion does not change much when the residence time is increased after the optimum value, indicating that the reaction has reached its thermodynamic theoretical range. According to the catalytic lifetime test of 1Cu1Zn/SBA-15, CO₂ conversion percentage and LPG selectivity do not change after 85 hours. Based on the results of the experiments, the synthesized catalyst can hydrogenate CO₂ efficiently to LPG.
 

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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:

1. Is there a significant relationship between using memory strategies and the success of non-Iranian Arabic language learners in writing skills?
2. Is there a significant relationship between using cognitive strategies and the success of non-Iranian Arabic learners in writing skills?
3. Is there a significant relationship between using compensation strategies and the success of non-Iranian Arabic learners in writing skills?
4. Is there a relation between applying total direct strategies (cognitive and compensation strategies) and the success of non-Iranian Arabic learners in writing skills?
5. 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?

According to the above questions, the following hypotheses are considered:

• 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.

The sample of this study consists of 42 non-Iranian Arabic-speaking Persian learners (men and women) who were in age range of 18-20 years old. These learners were learning Persian language in advanced level in the fall semester 2016. Oxford Language Learning Strategies Questionnaire (1990) is used to measure application of strategies, and the students' scores in the course of writing were used to determine the relationship between language learning strategies use and Persian learners' success in writing skill. The analysis of the hypotheses was done using Kolmogorov-Smirnov test, Pearson correlation coefficient and regression and the results of the Pearson correlation coefficient test showed that there is a significant positive relationship between the use of memory strategies with success in writing skill. In addition, according to the results of correlation coefficient, there is also a significant positive correlation between the use of compensation strategy and success in writing skills. This is despite the fact that according to the findings, there is not a significant relationship between the use of cognitive strategies and learners success in writing.  Regression analysis also indicated that among direct learning strategies, two types of memory and compensation strategies, causes success of Persian learners in is writing skill. And among these strategies, compensation strategies are more effective than memory strategies on success of Persian learners. Finally suggestions for teaching strategies in the classroom were presented.
 

 

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Critical realism,as a branch of the literary school of realism,seeks to convey objective and accurate experiences of reality to the reader by looking at the social problems of man in the new age,and to criticize the prevailing situation in society with a reformist attitude. Samuel Shimon In his first novel,“An Iraqi in Paris”,was able to gain a special place in the field of fiction in Arabic literature;Reza Ghasemi is one of the most prominent novelists of Persian literature that wrote the novel“Nocturnal Harmony”.Both novels reflect the realities of their society and the phenomenon of migration.The purpose of this study is investigate the harmful challenges of the migration phenomenon.In this research,by examining the components of immigration literature from the perspective of critical realism based on description and analysis in the context of the American comparative school, two novels are examined.The results of the research show:Doubt in the basis of insider culture and cultural contradiction in the novel"Nocturnal Harmony"is more prominent than the novel"An Iraqi in Paris" but this is manifested in both novels in the form of alienation.In both novels, critically reviewing the past,while criticizing the political and social conditions prevailing in their society,the way of teaching some religious and cultural teachings has also been criticized.The challenges of immigration are manifested in both novels in the form of disappearance,identity crisis, homelessness and insecurity,but the author has a positive view of the future in the novel"An Iraqi in Paris",but in the novel" Nocturnal Harmony"the authorchr('39')s view is hopeless.

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The mythological analysis of the roles of the heroes in the stories reveals new facts about the human institution and its interests and aspirations. The heroine in the form of a mythical representation is one of the most important types of mythological cognition in ancient societies of maternal descent, which is of great value in historical, literary, psychological and mythological research. In this article, the importance of women and their special role in the formation of mythological narratives as well as its connection with the structures of nature, ie water, soil, plants and trees ... are criticized. The purpose of this study is to study, critique and analyze the mythology of the heroine in two mythical narratives of Tiamat, Marduk, Shahnavaz, Arnavaz and Fereydoun based on Raglen theory. In this article, the authors have tried to deal with the mythical critique and comparative interpretation of the archetype of the heroine in two mythological narratives "Tiamat-Marduk" and "Shahnaz-Arnavaz and Fereydoun" and also to point out the common connection between these two narratives with the structures of nature The following results indicate that in both narrations, the female heroes: Tiamat in the myths of Mesopotamia and Shahnaz and Arnavaz in the myths of Iran are the gods of water and in fact the eternal mothers from whom the creation of all living beings takes place. The role of the male god in the form of Fereydoun and Marduk has a lesser appearance. What is tangible and visible in both narrations

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The aim of the present study was to investigate the students' learning styles and their influence on performance in various question types of IELTS examination and also in gaining higher band scores. In order to find answers to research questions, the researcher first used Kolb's questionnaire to recognize individual learning styles of candidates which were accordingly categorized into four classes as activists, theorists, pragmatists and reflectors. According to the results of the ANOVA, in listening comprehension section only some of the mean differences between groups were statistically significant in different question types. In note completion, multiple choice, and matching question types researchers faced a statistically significant difference. The results of the comparison between performances of the four groups in the IELTS reading test revealed that the mean score of the theorist group was higher in matching tasks and multiple choice questions and reflectors out-performed the others in task completion questions while activists had better performance in yes, no, not given tasks and pragmatics were better performers of short answer questions. So, researchers were on the safe side to say that variation due to belonging to different learning style groups causes variation of performance in different question types.
 

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Residual stress measurement is one of the most interesting research areas in experimental mechanics. Residual stress is introduced to material due to plastic deformation of parts and can be one of the most effective parameters on design and operation of parts. ASTM E837-01 standard studies residual stress determination in parts by hole drilling method and represent calibration coefficients for flat sheets with constant stress profile. However, there is no certain standard on the residual stress measurement by Incremental Hole Drilling Method (IHDM) which is the subject of this study. IHDM can obtain stress profile by using two modified stress calibration coefficients. In this article, the stress calibration coefficients have been extracted for incremental hole drilling by using finite element analysis (FEA). FEA contains both biaxial tension test and pure shear test which a hole has been drilled step by step in the parts by removing elements and the strains changes were determined at three strain gauge positions on the surface. At last, the calibration coefficients are determined for each step and the accuracy of coefficients have been verified by a set of experimental test and a FE analysis. The experimental test contains four-point bending of an AA5056 flat aluminum sheet. The numerical analysis contains four-point bending of a flat sheet. In both cases, the stress profile can be determined easily by using analytical equations. Average analytical stress in each increment has been calculated and compared with the result of numerical incremental hole drilling method. The comparisons show that numerical and experimental results have no significant differences in first six steps but in the last four steps show an increasing errors due to the change in stress profile and hole geometry. Results presents that the calibration coefficients have suitable accuracy in stress profile determination.

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Breast cancer is a serious health concern for women. It contributes to about 23% of the cancer cases, and accounts for the second largest number of deaths among all cancers. Expensive and time consuming recognition methods currently available for recognition of breast cancer potentiates the need for improvement of novel, specific and ultrasensitive strategies. Biosensors are sensitive, specific and cost effective procedures. These also display the benefit of quick response due to direct calculation in physiological fluids (saliva, blood, serum, milk, urine etc.) in a non-invasive way. Aptamer-based biosensors for cancer cell recognition have shown advantages of rapidness, simplicity and cost-efficiency over traditional approaches. In this study, by linking DNAzyme and aptamer together, we established colorimetric biosensor for the detection of MCF7 breast cancer cells.  MUC1 and PTK7 aptamers used as specific aptamers to binding to the breast cancer cells. This manner may also evade the modification of DNA and the use of labels, which can intensely rise the cost-efficiency and simplicity of cancer cell discovery. Our results indicated that these aptamers showed good activity for breast cancer cells detection in which in the control cells no activity was observed. Results also indicated that there is a good linear relationship between the cancer cell values and colorimetric signal. Finally, the obtained results indicated a cost effective and conveniently operated approach for cancer diagnosis in future.

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The notion of the ideal city is a seductive vista, beckoning from the realm of aspirations and dreams. It stands as a realm untouched by pain, suffering, or illness a symbol of a flawless and utopian reality. In contemporary poetry, poets often turn to the imagery of this ideal city within their verses, seeking solace from the tribulations and yearnings of their time. This research, employing an analytical-comparative approach, delves into the conceptual origins of the ideal city within the poetry of Fadavi Taqvan and Zhaleh Esfahani, following a brief exploration of their life narratives. The study aims to unravel the shared themes and distinctive nuances embedded in their poetic renderings.This research holds significant value as it pioneers a comprehensive exploration of the ideal city concept within the works of these two female poets. Such an in-depth comparative analysis has been notably absent in existing scholarly pursuits. A key revelation of this study is the tendency of both Fadavi Taqvan and Zhaleh Esfahani to seek refuge in the ideal city through select verses, allowing them to transcend political challenges and personal tribulations. Their poetry breathes life into this utopian city, framing it within contexts such as revisiting childhood, reminiscing about ancestral lands, experiencing absolute tranquility and envisioning a dreamlike homeland.

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In the present paper, the parameters of Johnson - Cook (JC) constitutive model for two steels have been identified, based on the Hopkinson pressure bar test results. The experimental data has been taken from the split Hopkinson pressure bar data found in the literature. Using the measured strain pulses, the experimental stress - strain and deformation - time curves can be extracted. The experimental data have been processed using two different methods. In the first method strain rate assume to be constant during deformation and in the other one the deformation has been applied to a modeled specimen. In each method, an optimal set of material constants for JC constitutive model have been computed by minimizing the standard deviation of the numerically obtained stress - strain curve from the experimental data. Also a sensitivity analysis has been performed on JC constitutive model parameters and temperature changes during test have been investigated. The obtained results show that using constant strain rate method, leads to considerable error in results; for example in this study the minimum error is about 14%.

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In this paper, pollutants flows coming out of stacks or cooling towers with different outlet shapes have been numerically studied. The effects of exhaust outlet on plume rise, and the pollutant dissipation are investigated. To simulate the flow turbulence, realizable k – ε model is employed for the case of a stack flow with more than one exhaust outlet on the influence of wind condition. The plume rise and dissipation of pollutant are depending on the direction of the wind and the shape of exhaust outlet. Depending on wind direction and shape of exhaust outlet, higher or lower levels of plume rise can be obtained with various kind of pollutant dissipation. These changes are due to the influence of high pressure upstream and low-pressure downstream flow fields of outlet from stacks on the counter vertex rotating pair. The maximum concentration and dissipation of pollutant for various wind directions and output configurations are examined.

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Objective: Considering the various evidences due to effects of trace elements on the outcome of pregnancy, we decided to assess the effect of these elements levels in maternal and cord serum on low birth weight. Materials and Methods: An Analytical cross-sectional study was performed on 344 pregnant women in labour and their neonates in Maryam, Akbarabadi and Vali-e-Asr hospitals in Tehran, Iran. Iron, zinc, copper, magnesium and calcium concentrations in cord and mother serum were measured. Collected data were analyzed by spss13 software, using Chi- square and Logistic regression tests with significant level p< 0/05. Results: The characteristics of studied subjects were: Mean age: 27.02±5.3 years, pregnancy duration: 38.9±1.3 weeks, number of low birth weight neonates: 13(3.8%). Prevalence of trace elements deficiencies in mothers were: zinc: 26.7%, copper: 53.5%, magnesium: 72.4%, Iron: .6%, calcium: 49.4%, and in neonates were: zinc: 3.5%, copper: 41.6%, magnesium: 67.4%, Iron: 3.2% and calcium: 2.3%. In Chi- square test, a significant negative relationship between maternal calcium deficiency and low birth weight (p=.011) was found and logistic regression analysis showed a significant negative relationship between maternal calcium serum and low birth weight (odd: 0.27, %95CI: 0.09- 0.77). Conclusion: Delivering low birth weight neonates were more common in mothers with calcium deficiency and other elements did not show any significant relationships with low birth weight. It is possible to find different results about the effect of these minerals on pregnancy outcome with more samples and in different settings. It is recommended to perform more research on effects of trace elements on neonatal and maternal pregnancy outcomes to help prevent mother and fetus mortality and morbidity.

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Functionally graded materials have been taken into consideration by many researchers in the last two decades. Gradual changes of mechanical properties in FGMs decrease stress concentration, crack initiation and propagation and delamination. Many of the present and potential applications of FGM contain contact loading.This kind of loading causes surface crack initiation which is followed by subcritical crack propagation.Thus, propagation of surface cracks is one of the most important failure mechanisms in FG structures. In this article two dimensional sliding contact of a rigid flat punch on a homogeneous substrate with an FGM coating is studied. Plane strain condition is considered in this problem. The Properties of the substrate and the FGM layer are assumed to be elastic and the Poisson’s ratio is assumed to be constant. The modulus of elasticity in the graded layer is calculated based on TTO model approximation. This model defines a parameter q which considers the microstructural interactions. The governing equations are solved by Finite Difference method by means of MATLAB software. The influence of different parameters such nonhomogeneity,q, the dimensions of the punch, the thickness of the graded layer and the coefficient of friction on the mode I and II stress intensify factors are investigated.

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Most of the research has been concentrated on the effects of the horizontal components of near-field earthquakes on the dynamic behavior of the embankment dams. In this paper, the effects of the vertical components will be considered. One of the important characteristics of the near-field ground motions, is the noticeable vertical component with the high frequency content that can exceed considerably, in many cases, the horizontal component of the same earthquake. So far, few studies have been done in this area. In order to investigate the effect of the vertical ground motion on the dynamic behavior of embankment dams, a two dimensional numerical model of the Alborz dam is analyzed by using finite difference method which is used in FLAC2D code. It should be noted that the Alborz dam is a rockfill type with clay core and a maximum height of 78 m located on the Babol River in the north of Iran. The Mohr Coulomb elastic perfectly plastic constitutive model was used to simulate the stress-strain behavior of the dam body and its foundation during the static and dynamic loading. Steps of modeling are as follow: At first stage, construction was carried out in 16 layers. At this step, coupling analysis were done in order to simulate the consolidation and build up of pore pressure in clayey core, with respect to the real time of construction for each layer. Then the analyses were continued to modeling of the impounding. So at this stage the reservoir was raised to the normal water level and the model were analyzed to the steady state seepage condition. Records of near-field and far-field were selected from the same earthquake to provide better and more accurate comparison. Before applying the earthquake records to the base of the foundation in the model, they must be modified. So deconvolution analyses were done by using SHAKE2000 code in order to get the target motion with peak ground acceleration of 0.52g at the surface of the foundation (maximum credible earthquake level at the site of Alborz dam). In addition filtering process, baseline correction and conversion the acceleration time history to the stress time history were done. Results of analysis show that the vertical component of near-field ground motion has considerable effect on the magnitude of strains and deformations including: increasing the settlement of the dam crest to about 45 percent, increasing the deformation of the horizontal axis of the dam, reduction of the magnification factor of the dam crest and especially in the case of near-fault, which the occurrence of near-field earthquakes is more probable. Therefore, this issue should be considered in locating the embankment dams regarding the seismic potential and the distance from the fault, and in the design of them.

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aims: In this article, Shamsiya of Yazd, a complex of the 8th century A.H, is examined through the lens of two historical texts "Tarikh-e Yazd" (by Ja’fari) and "Tarikh-e Jadid-e Yazd" (by Kateb) - both from the 9th century. The differences between these 2 descriptions and with the remains of the building, provides a framework for understanding this building and its perception in the past.

Methods: This article, using the historical-interpretive method, first deals with the identification of the Shamsiya complex in the Waqfname (endowment letter) of Jame’ Al-Khairat, and then compares the descriptions of Ja’fari and Kateb with each other and with the Waqfname and building itself. Secondly, it will list the differences among descriptions. Finally, considering social backgrounds and textual context, it will recognize the Shamsiya collection and the way it was looked upon.

Findings: The main difference between Jafari's text and Kateb's about Shamsiya is the type of reference to decorative details and water supply corridors. Also, while the texts of the 9th century mention two madrasas in this complex, only one madrasa is mentioned in Jame’ Al-Khairat. There are other minor differences between them also.

Conclusion: The key to understand the differences lies in two authors' different perspectives; While Ja'fari pays attention to the whole building and the surface water passages, Kateb weighs more to the decorative detail and underground water. Also, the difference between the social background of the 9th and the 8th century has caused the building of Dar al-Siyadeh to gradually become "Madrasa".

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In present paper the Inamuro Model based on free energy approach of the Lattice Boltzmann Method (LBM) was used to simulate the motion of bubble and coalescence of two bubbles under buoyancy force. By combining the Tanaka and Inamuro models, three-dimensional model of Inamuro was used in two-dimension for decreasing the computational cost. Firstly it was ensured that the surface tension effect and Laplace low for two density ratio 50 and 1000 were properly implemented. Secondly in next step, effect of governing dimensionless numbers problem such as Etvos number and Morton number on Reynolds number and terminal shape of bubble were investigated. Different flow patterns in various dimensionless numbers were obtained and by changing the dimensionless number, terminal change of bubble’s shape was seen. Finally, motion of two bubbles and terminal shape of coalescence of two bubbles were studied in different dimensionless number, which shape of first bubble was same to single bubble, but it was seen that second bubble experienced various shapes due to its location in wake of first bubble and less difference pressure on two sides of this bubble.