Abstract. Let G be a Banach Lie group modeled on the Banach space, possibly infinite dimensional, E. In this paper first we introduce Euler-Lagrange equations on the Lie group G with potential and right invariant metric. Euler-Lagrange equations are natural extensions o More
Abstract. Let G be a Banach Lie group modeled on the Banach space, possibly infinite dimensional, E. In this paper first we introduce Euler-Lagrange equations on the Lie group G with potential and right invariant metric. Euler-Lagrange equations are natural extensions of the geodesic equations on manifolds and Lie groups. In the second part, we study the geometry of the mechanical system of a rigid body with a fixed point in the gravitational field. This Mechanical systems is usually know as symmetric heavy top. Then we show that the extracted equations by this theory coincide with the known equations of heavy top. Finally, as an infinite dimensional example, we study the Camassa-Holm equations on Bott-Virasoro group at the presence of potential. Bott-Virasoro group is the product of the group of diffeomorphisms of the circle of Sobolev class by the real line and by a potential on a Lie group G we mean a differentiable function from G to the real line R.
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The purpose of this study was to evaluate the efficacy of Barlow’s cognitive–affective counseling on the improvement of sexual frigidity on married women in Isfahan in 2014. The design of the research was quasi-experimental with pre- and post-test. The popul More
The purpose of this study was to evaluate the efficacy of Barlow’s cognitive–affective counseling on the improvement of sexual frigidity on married women in Isfahan in 2014. The design of the research was quasi-experimental with pre- and post-test. The population included all the married women in Isfahan. A sample of 30 women, then, with the lowest score in sexual function was selected and assigned into two groups, experimental (n=15) and control (n =15) through voluntary sampling method. The research instruments consisted of Female Sexual Function Index (FSFI) (Rosen et.al, 2000). The experimental group received 8 sessions of cognitive-affective counseling. The data were analyzed by analysis of covariance. The results showed that the effectiveness of Barlow’s sexual cognitive-affective counseling on women’s sexual frigidity treatment was significant (P= 0.01). As a result, to improve any of the females’ sexual components, Barlow’s cognitive- affective counseling can be used.
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Mechanisms with flexible joints transfer displacement, force and energy by using flexure hinges instead of Simple hinge joints. Reduction of manufacturing costs, increasing the accuracy of these mechanisms, absence of error caused by being loose and lack of joint wear a More
Mechanisms with flexible joints transfer displacement, force and energy by using flexure hinges instead of Simple hinge joints. Reduction of manufacturing costs, increasing the accuracy of these mechanisms, absence of error caused by being loose and lack of joint wear and vibration problems resulting from their movements are among the advantages of these types of mechanisms. In this article for analyzing these mechanisms, a quasi-rigid model was used. Then, by introducing and evaluating a number of mechanical magnification mechanisms which were used to increase the movement of piezoelectric actuator, a new model is also provided and analyzed. This new model offers a high ratio in compact dimensions that is pretty good compared to previous models. The natural frequency of the model and the lack of lateral movements are among advantages of this model compared to the models introduced. We will review and determine the design parameters for the analytical solution for the optimal work condition of the quasi-rigid mode. Also, by using finite element analysis and comparison of its results with analytical solutions, the effect of various parameters on the performance of this mechanism have been identified and at the end an optimal mechanism is offered.
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In this paper some mechanical amplifiers have been investigated then a new model has been introduced, designed and analysed. This new mechanism can present a large amplification ratio in a very compact size. High natural frequency and the absence of lateral motion are t More
In this paper some mechanical amplifiers have been investigated then a new model has been introduced, designed and analysed. This new mechanism can present a large amplification ratio in a very compact size. High natural frequency and the absence of lateral motion are the advantages of this new model toward the other models introduced here. In order to present an analytical investigation for this new mechanism, the pseudo rigid model is utilized and optimized for the best working conditions. This model is also analysed and verified using finite element method. The results of FEM are utilized to specify the effect of parameters which cannot be seen in pseudo rigid model. An optimized model with its dimensions sketched finally.
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توانایی خوانندگان در ادغام کردن اطلاعات جدید و اطلاعات قبلی ارائه شده در متن به عنوان بخش مهمی از فرایند درک مطلب در نظر گرفته می شود. یک جنبه از این فرایند عبارت است از بازیابی مرجع ضمیر در متنی که خوانده می شود. هدف از این تحقیق بررسی فرایند بازیابی مرجع ضمیر همچنین ب More
توانایی خوانندگان در ادغام کردن اطلاعات جدید و اطلاعات قبلی ارائه شده در متن به عنوان بخش مهمی از فرایند درک مطلب در نظر گرفته می شود. یک جنبه از این فرایند عبارت است از بازیابی مرجع ضمیر در متنی که خوانده می شود. هدف از این تحقیق بررسی فرایند بازیابی مرجع ضمیر همچنین بررسی میزان دشواری انواع مختلف مراجع ضمیر می باشد. شرکت کنندگان این تحقیق 90 نفر از دانشجویان زبان انگلیسی می باشند که بطور تصادفی از بین دانشجویان در دسترس در مقطع کارشناسی از دانشگاهی در شهر اصفهان انتخاب شدند. ابزار استفاده شده در این تحقیق عبارت است از آزمون مرجع یابی متشکل از 30 متن مختلف علمی. در طول مطالعه از شرکت کنندگان خواسته شد که مراجع ضمیر را پیدا کنند و زیر آنها را خط بکشند. بعد از جمع آوری و طبقه بندی داده ها از نرم افزار آمار ی SPSS برای تحلیل و بررسی داده ها استفاده شد. نتایج تحلیل واریانس یک طرفه. بر این نکته دلالت داشتند که مراجع ضمیر مختلف از لحاظ درجه دشواری بازیابی متفاوت هستند، F (4, 87) = 10.28, p
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The main goal of this study is to introduce a general stochastic dynamic equilibrium model with sensitivity analysis for the wage rigidity in Iran's economy using the seasonal data from 1995-2014. The results showed, capital market dynamics influence the real sector of More
The main goal of this study is to introduce a general stochastic dynamic equilibrium model with sensitivity analysis for the wage rigidity in Iran's economy using the seasonal data from 1995-2014. The results showed, capital market dynamics influence the real sector of Iranian economy. The monetary policy shock has a significant impact on macroeconomic variables and stock prices. The volatilities in stock prices helps to explain the Iranian business cycles. In the case of bubble in asset prices, credit constraint in firms was decreased and their opportunity cost decreases and causes a downward pressure on the marginal costs and finally inflation decreases. By assuming wage rigidity, possibility of wage adjustment with regard to monetary shock decreases and the reaction of labour and labour supply is been more strict. And changes in production is slower than when the wage perfect flexibility exist. Based on the results, using of the model with wage rigidity in order to better simulate the real world is suggested.
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As the population grows, the importance of creating more buildings in the short term and at low cost, such as prefabricated structures, becomes more apparent. For this purpose, in this research using SAP 2000-14 software, three kinds of 2, 4 and 6-story RC frames were d More
As the population grows, the importance of creating more buildings in the short term and at low cost, such as prefabricated structures, becomes more apparent. For this purpose, in this research using SAP 2000-14 software, three kinds of 2, 4 and 6-story RC frames were designed by considering connection rigidity. Three types of connection rigidity including pinned, semi-rigid and rigid precast RC connections were applied to estimate response modification factor (R) of designed frames. It is worth mentioning that each of the frames has five bays and the length of each of the bays is 5 meters with the exception of median bay that is 4 meters strengthened with X-steel bracing. Then the nonlinear static analysis was applied to evaluate the effect of frame’s height and connection rigidity on response modification factor of designed frames. The results presented that with increasing the rigidity and frame’s height R factor is increased.
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Structural analysis is very complicated in terms of actual behavior of its connections, and for this reason, by employing the concept of the beam line, certain stiffness is attributed to each connection and thus the connections are categorized. More
Structural analysis is very complicated in terms of actual behavior of its connections, and for this reason, by employing the concept of the beam line, certain stiffness is attributed to each connection and thus the connections are categorized. In this research, a semi-rigid connection with stiffener plates is considered in the connection between a beam web and a column. For this purpose, 64 analytical models are utilized, in which the features of stiffener plates, such as height, width, and thickness are changed. There are four variable modes for height, four variable modes for widths, and four variable modes for thickness, making a total of 64 different models. The connections were modeled under a nonlinear static analysis and then the momentum-rotation diagrams were plotted for each mode. So that, the behavior of the semi-rigid connection and the impact of the connecting plates on its performance was investigated. Finally, by comparing the results, a relationship was provided for estimating the rigidity percentage of a semi-rigid connection
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The design and evaluation of concrete gravity dams will be studied in the present study. The case study consists of a comparison between old research methods and new ones. In the present case, an analysis of concrete gravity dams with different water levels influenced b More
The design and evaluation of concrete gravity dams will be studied in the present study. The case study consists of a comparison between old research methods and new ones. In the present case, an analysis of concrete gravity dams with different water levels influenced by earthquake will be presented. The subject of the study is a concrete gravity dam project by Rolling Compact Concrete (R.C.C), which is to be located 30 kilometers away from the South East of Sanandaj named Jaweh. It would be the second R.C.C dam made in Iran. The data used in the study is collected from detective. One of the investigation methods is a simplified one by Chopra and Feneves, which is based on a pseudo dynamic method. The new investigation method is conducted on the basis of finite element. Abaqus and Cadam Softwares are based on finite element method as well. This essay investigates the effect of linear behavior of concrete gravity dam with different water levels on rigid and flexible foundation. Afterwards the effect of non-linear behavior of concrete gravity dam on tensil cracking will be investigated and cracking seems directions will be studied by three earthquake accelerators.
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Abstract
The present article tries to study the popular uprising in Arab countries of the Middle East and North Africa by a political economy of oil approach. The article makes use of a multi-variable analytical model that can both explain causes of uprising an More
Abstract
The present article tries to study the popular uprising in Arab countries of the Middle East and North Africa by a political economy of oil approach. The article makes use of a multi-variable analytical model that can both explain causes of uprising and different directions and outcomes of the events in popular revolt that started in Arab countries from late 2010. The article shows that all the countries of the Middle East and North Africa have similar characteristics that can explain them as dependence on foreign rents. Kind and level of these rents and the extent of dependency on them vary among the countries of the region but the presence of rents is common among them nevertheless that affects the political stability in different ways. The most important question of the article is how political economy of the Middle East oil has affected the popular uprising of the Arab countries and its process of the developments. The underlying hypothesis is that the political economy of oil of the Middle Eastern countries has created a rigid rentier structure and this particular structure has played an important role in popular uprisings. A different mix of oil revenue along with mediatory socio-political variables has led to different directions of political development of the uprisings of the people of the region. The article makes use of new theoretical framework in studies of oil and politics and by the help of it explains different directions of different countries uprisings. The article by the help of descriptive analytical method has analyzed qualitative and quantitative data to test the hypothesis.
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Parkinson's disease (PD) is considered as a movement disorder, and its diagnosis is based on the presence of a set of cardinal motor symptoms. Since the pathogenesis of PD is not well understood today, the importance of the use of animal models to better understand PD a More
Parkinson's disease (PD) is considered as a movement disorder, and its diagnosis is based on the presence of a set of cardinal motor symptoms. Since the pathogenesis of PD is not well understood today, the importance of the use of animal models to better understand PD and its cure is discovered. We aimed to provide new evidence on the comparison effect of rotenone on the components of PD. Thirty male mice (30±2 gr) were randomly divided into 3 groups; control group, rotenone solvent group, and rotenone group (ROT). ROT was treated with rotenone injections (2 mg/kg/48 h) for 19 days. Thus, the components of balance, movement, muscle rigidity and muscle strength tested by rotarod, open-field, and triple horizontal bar, and save testing data to evaluate and compare the effects of rotenone on these components. Component of muscle strength in all groups affected more than other components (P<0.05). In the next degree of balance, movement and muscle rigidity were affected. Rotenone could affect components of PD model which improved muscle strength component and was better than that of the other components. Probably this subject, including the main features of rotenone creates an experimental model of Parkinson's disease.
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