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Showing 5 results for Kakavand


Volume 1, Issue 2 (NO. 2- 2009)
Abstract

Abstract In this article has been studied the effect of parents economic capital, social capital, cultural capital and communicative action within the family on youth Social capital. The statistical population is pre-university boys and girls of Tehran city. The sample size calculated was 302 people, selected at two stages by random proportional stratified sampling. Regression analysis and path analysis methods were used for the judgment of the hypotheses. Experimental findings indicated that the correlation coefficient of the social capital of children and the linear combination of independent variables was equal to /71. Weight of communicative action within the family was more than the other independent variables in explaining the social capital of children.

Volume 12, Issue 4 (Fall 2024)
Abstract

Aims: Vaginismus disorder is the second most common sexual dysfunction in women, and it is a significant issue in the lives of those affected. This disorder has unfortunate and destructive consequences for the individual’s health, the family unit, and the couple’s intimacy. This study aimed to compare vaginismus-specific schema therapy with conventional schema therapy in terms of their effects on sexual self-assertiveness and self-esteem in women with vaginismus disorder.
Materials & Methods: This quasi-experimental research employed a pre-test, post-test, and follow-up design, including a control group. The statistical population consisted of women with vaginismus disorder who were referred to the obstetrics and gynecology clinic of Payambaran Hospital in Tehran, Iran, in 2021, of whom 45 individuals were selected using a purposive sampling method, and were randomly assigned to three groups through a simple lottery method (n=15 per group). The Persian version of Halbert’s Sexual Self-Assertiveness Questionnaire and the Female Sexual Self-Esteem Inventory (SSEI-W) developed by Zeanah and Schwarz were used. The two experimental groups received treatment in ten sessions, each lasting 90 minutes, while the control group did not receive any intervention. Data were analyzed by repeated-measures ANOVA and Bonferroni’s post-hoc test using SPSS 22.
Findings: Both vaginismus-specific schema therapy and conventional schema therapy were effective in increasing sexual self-assertiveness (Eta=0.83) and self-esteem (Eta=0.94) in women with vaginismus disorder compared to the control group (p=0.001). A comparison of the mean differences between the two intervention groups and the control group revealed that vaginismus-specific schema therapy was more effective in improving self-assertiveness and sexual self-esteem in women than conventional schema therapy (p=0.001).
Conclusion: Vaginismus-specific schema therapy for vaginismus enhances sexual self-assertiveness and self-esteem among women with vaginismus by helping them identify their problems.
Yossef Hojjat, Keyvan Kakavand, Mojtaba Ghodsi, Ali Asghar Maddah,
Volume 14, Issue 12 (3-2015)
Abstract

In this paper a new model is developed to describe the response of Magneto-rheological fluids (MRF) in transient state. The models which are developed so far, cover the steady-state flow, or address the transient state, with step-wise input electrical current and constant shear rate. In this paper, a new model for transient state of MRF is developed in which the input electrical current is an exponential function in different values of shear rate. Due to the magnetic inertia caused by the inductance of the coil, the real magnetic flux density could not be step-wise. Hence, compare with the other models, this model is in well agreement with reality. To verify the presented model and study the fluid properties as input parameters, an experimental coupling is designed and fabricated. The coupling applies magnetic field perpendicular to shear direction, and measures the shear stress as a function of time. The results of the proposed model show acceptable agreement with experimental observations. According to experimental and theoretical results, the presented model is applied to a controllable torque coupling and acceptable results were obtained.
Mohammad Navabi, Esmaeel Kakavand,
Volume 15, Issue 10 (1-2016)
Abstract

Due to instability and specific configuration of tailless aircraft, there should be a controller with capability of stabilizing the aircraft in various maneuvers and flight conditions and also to have desired robustness against different parametric and non-parametric uncertainties. Different researches are done in the field of controlling such aircraft. But, most of them are concerned with longitudinal motion of the aircraft and its modes or stable maneuvers. In this paper, we design a multi input-multi output combined model-reference adaptive controller for a tailless aircraft. Coordinated turn is an unstable maneuver, itself. The addition of the instability of this maneuver and the instability of a tailless aircraft causes a highly unstable situation. Combined model-reference adaptive control benefits the aggregation of the tracking error and prediction error. Combining these two sources of errors alleviates the transient response characteristics, and a combined model-reference adaptive controller has better performance comparing to the classical model-reference adaptive controllers (with tracking error as the only source of parameter estimation error), and this property could be useful in highly unstable systems like tailless aircraft. Here, after extracting the equations of motion of an aircraft and exerting the conditions of coordinated turn maneuver, we design a combined model-reference adaptive controller for a tailless aircraft. The simulation results show accuracy of the designed controller in stabilizing the aircraft during the coordinated turn maneuver and its robustness against uncertainties.

Volume 28, Issue 3 (9-2021)
Abstract

Sufficiency in the conventional sense of symbols has prevented them from defining new concepts. On the other hand, the foundation of factors that shape the patterns leads to the decipherment and production of a new meaning. The role of the peacock has always been a symbol of pride, glory, and beauty. However, understanding the visual difference between the twelfth-century peacock motif carpet and the previous specimens doubled the need to reproduce the new meaning. Auxiliary text was needed to achieve this goal. With such an approach, Sheikh Shahab al-Din Suhrawardi's " Loghat-e-Moran seems appropriate. It's as if our Loghat-e-Moran for a text was an image of an altar rug peacock in the Metropolitan Museum, and as a result it was read accordingly. Understanding the meaning of the peacock motif based on the thematic application of the carpet and the above treatise is the main purpose of this article. The result shows that the peacock, in addition to its common meanings, was a symbol of longing and sorrow. This research is based on the qualitative method and developed and described based on the motif of the altar peacock carpet in the meaningful context of the text Loghat-e-Moran by Sheikh Ishraq. In terms of classification, it is descriptive and analytical study.

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