فهرست مطالب maryam bayat

The present study was conducted with the aim of investigating the relationship between learning styles (concrete, reflective observation, active and concrete experimentation) and intrinsic motivation with the mediating role of teacher-student bond. The research method was descriptive correlational. The statistical population included all 5600 students of the 11th grade in Zanjan city in the academic year 2022-2023. 300 people were selected as a statistical sample based on the availability sampling method as well as Morgan's table. To collect data, Kolb's (1984) learning style questionnaire, Amabile et al.'s (1994) intrinsic motivation scale, and Murray and Zivach's (2011) teacher-student relationship inventory were used. Data were analyzed using structural equation modeling. The findings showed that there is a direct and meaningful relationship between concrete learning style, reflective observation and active experimentation with intrinsic motivation, but no relationship was found between abstract learning style and that type of motivation. Also, there is a direct and significant relationship between the concrete learning style, reflective observation and active experimentation with the teacher-student bond, but no relationship was found between the abstract learning style and teacher-student bond (p<0.01). In addition, there is a significant indirect relationship between the concrete, reflective and active experimental learning style and with intrinsic motivation through the mediation of the teacher-student bond; However, no significant indirect relationship was found between abstract learning style and intrinsic motivation (p<0.01). As a result, it seems that in order to improve students' intrinsic motivation, learning styles and teacher-student bond can be investigated.

In the design of embankment dams, the vertical or inclination of the core has its own advantages and disadvantages according to technical and economic considerations. In each of these options, it is necessary to pay attention to the amount of seepage, deformations and stresses created in the body and foundation of the dam, as well as stability. In addition, the control of the arching caused by different stresses and subsidence in different levels and areas, which can lead to hydraulic failure of the dam, should also be considered. In this study, while analyzing the static behavior of the "Azad" dam in real condition (with a vertical core) in GeoStudio software, analysis of seepage, stress-strain, arching and slope stability with different core inclination (zero , five, 10, 15, 20 and 22 degrees relative to the vertical) at end of construction and steady-state seepage have also been studied and compared. The results showed that for a given depth, with increasing the angle of inclination of the core from the vertical position, the seepage through the dam body and foundation (especially for angles greater than 15 degrees) and the vertical displacement of the core central line increased. Also with increasing the angle of inclination, the average stability safety factor of the downstream slope of the dam increased imperceptibly but for the upstream slope especially for angles greater than 15 degrees, there was a significant decrease of 22.6 percent. The trend of increasing the total vertical stress along the central core line with increasing depth for different angles of the core did not change significantly. In the case of arching, except in the height range of 0.3 of the height of the crest, the probability decreased with increasing inclination angle of the core.

The purpose of this research was to study the "challenges of Iranian delegations’ to international sports events and Social and cultural development of communities ". The research is of descriptive-applied type which was done qualitatively and quantitatively. The statistical population at quantitative section also included 120 chef de missions, administrative staff and managers of national teams participating in international sporting events, presidents and secretaries general of the National Olympic Committee using Cochran's first formula. The sample size of the required quantitative fraction was estimated to be 92 people selected by simple random sampling. In the qualitative part, using the grounded theory method, all the challenges were counted and then in the quantitative part, these challenges were tested. Then, to collect data, a researcher-made questionnaire (41 questions) (5-item Likert scale items) was validated by Cronbach's alpha (94%) content validity (expert testing)At the end, the data were analyzed by one-sample t-test and Friedman statistical tests with SPSS V.26 statistical software. The results of the hypothesis test showed that the chef de missions of Iranian delegations participating in international sporting events faced: "before the games" with challenges The most important of which is the selection of a qualified leadership team; In "during the games" with 14 challenges, the most important of which is the presence of the Zionist athletes in the tournament table and the possibility of facing them, and "after the games" with 6 challenges, the most important of which is creating an inappropriate atmosphere by the media.

Electromagnetic induction (EMI) methods have an important role in modeling hydrocarbon reservoirs embedded in marine sediments. One of these methods is marine control source electromagnetic (MCSEM) technique. In comparison with other geophysical techniques like seismic methods, which model hydrocarbon reservoir with high accuracy, The MCSEM technique is comparatively less accurate but due to much less costs, this method may be recommended for modeling hydrocarbon reservoirs embedded in marine sediments. In addition, the sea water reduces the voltage resulting from magnetotelluric (MT) currents, thus the MT method is not efficient, and is not suitable for imaging marine hydrocarbon reservoirs. Hence, the MCSEM method is used for these reservoirs. In this research, for threedimensional (3D) forward modeling of a hydrocarbon reservoir with regular and irregular geometrical shape, and also, for four-dimensional (4D) forward modeling of a regular geometrical reservoir, integral equation (IE) method is used. The aim of the present study is to develop and apply several approximations to simulate the electromagnetic problems and to solve integral equation for 3D MCSEM synthetic data in order to avoid solving full integral equations, and also, to decrease the computational costs. In order to monitor small changes in electrical conductivity among increasing pressure inside the reservoir, the capability of time-lapse CSEM data has been discussed. It has been found that this method can detect the changes in the reservoir due to the fluid injection. In this study, T-matrix approximation (TMA), born approximation (BA) and extended born approximation (EBA) are applied to approximate 3-4D integral equations in the MCSEM method at low frequencies.

Internet addiction means excessive and unnecessary use of the Internet. The aim of this study was to investigate the role of brain-behavioral systems in Internet addiction among university students.

This was a descriptive and correlational research. The statistical population was all the students of Islamic Azad University, Karaj Branch in the academic year 1397-98. A sample of 162 students were selected, based on the Tabachnick & Fidell formula, using the multi-phase cluster sampling technic. The tools used to collect data were the harmful Internet use and the brain and behavioral system questionnaires.

Based on the multivariate regression analysis, 66.7% of Internet addiction among the students could be explained by brain-behavioral systems.  Active avoidance and approach, as components of the behavioral activation system, could predict Internet addiction negatively, while passive avoidance and extinction, as components of the behavioral inhibition system, and fight and flight from the components of the fight/flight system, could predict Internet addiction positively.

Purposeful communication and information search (pleasant unconditional stimuli), tedium and constant logic dominating the internet environment (unpleasant unconditional stimuli) have their own conditional cues on the Internet that indicate the degree of susceptibility of brain-behavioral systems to internet addiction.

Right ventricular (RV) restrictive physiology is a condition caused by the chronic elevation of systolic pressure in the RV, which is typically found in patients with tetralogy of Fallot (ToF) who had undergone total surgical correction and can be diagnosed either via cardiac magnetic resonance imaging (CMR) or finding the RV end-diastolic forward flow (EDFF) via echocardiography. We aimed to assess the relationship between RV restrictive physiology with myocardial fibrosis and functional indices on CMR, along with exercise capacity and diastolic dysfunction indicators measured by transthoracic echocardiography (TTE).  

All patients with a history of the total correction of ToF at childhood who referred to our center for the evaluation of postoperative severe pulmonary regurgitation were included. All the patients were examined using electrocardiography, the exercise test, TTE, and late gadolinium enhancement (LGE) CMR.  

Among the study population, 17 (56.7%) patients were found to have RV EDFF on their echocardiograms, while 18 (60.0%) had RV restrictive physiology on their CMR. The 2 diagnostic modalities had a moderate significant agreement for the diagnosis of RV restrictive physiology (Kappa = 0.521, P= 0.004). There was a significant difference between the patients with or without RV restrictive physiology based on CMR findings regarding the QRS duration (P = 0.015), Sm (P = 0.045), and the RV end-diastolic volume index (P = 0.036).  

TTE may be a good alternative for the evaluation of RV restrictive physiology after the total correction of ToF. However, RV restrictive physiology measured by CMR and RV EDFF measured by echocardiography could not correlate with quantitative RV myocardial fibrosis measured by LGE CMR. (Iranian Heart Journal 2020; 21(3): 87-97)

The design to construct Sazbon dam and power plant is a sub-group of designs that have anything to do with the tributaries of KARKHE BASIN. The location where the design is going to be implemented is in the province of Illam and eastern part of SARABLEH which is about 3 Km's after the confluence of two rivers named Simoreh and Cherdaval respectively within the straits of SAZBON. To determine the value of plant covering on the reservoir, first the values of trees and pasture were estimated subject to valuation codes and about 3269 acres of pastures (Echinops orientalis, Astragalus gossypinus, Hordeum spontaneum….,) and about 71 acres of woods shall(Amygdalus scopariaو Pistaciaو Quercus brantii(…و be flooded by constructing this dam. The damages were estimated to be 3198970040 billion IR-Rials which are evaluated to be very little against 660 billion IR-Rials of profits as gained by constructing the dam but can be compensated for by powers consumption revenues.