List of Articles Stability.

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  1 - Estimation of stream bank erosion by BSTEM model
  محمد مهدي حسين زاده Reza Esmaili
  Stream bank erosion is known to be a major source of sediment shedding in streams and rivers. However it is difficult to define and estimate the contribution of sediment from river erosion. The purpose of this paper is to demonstrate the application of BSTEM model as a More

  Stream bank erosion is known to be a major source of sediment shedding in streams and rivers. However it is difficult to define and estimate the contribution of sediment from river erosion. The purpose of this paper is to demonstrate the application of BSTEM model as a viable tool for identifying and quantifying the controlling bank-slope conditions for a range of stream-restoration objectives, evaluation of the importance of fluvial erosion, vegetation properties and near-bank pore-water pressure properties. The Bank Stability and Toe Erosion Model (BSTEM) were used in order to predict streambank retreat due to both fluvial erosion and geotechnical failure. In this research, BSTEM model also was used to simulate hydraulic erosion at the bank toe and bank stability during a series of flow events (bankfull discharge, mean annual flood, maximum flood discharge) for the purpose of evaluating current (existing) and potential changes in failure frequency (factor of safety or FS) and stream bank-derived loadings. The study site is located at the exit point of the Lavij river from the mountains in Kashpal park area (Chamestan-noor). Every year there is a significant amount of bank erosion caused by large floods in this river section. This study showed that for a multilayered stream bank in Lavij River, the most significant retreat occurred during a series of high flow events. In fact, the floods that occur with a return period of more than 10 years, play an important role in fluvial erosion and lateral retreat processes. Results of BSTEM analysis showed that lateral retreat measured at the stream bank in different scenarios ranged from 0 to 81cm and the bank stability conditions in the first scenario is unstable (FS =0.9), but in the second and thirds scenarios is almost stable (FS=1.15-1.26). Bank top vegetation provided additional cohesive strength to the top 1.0 m of the bank and resulted in a further reduction of failure frequency and failure volume. Results of this study showed that toe protection added to eroding stream banks can reduce overall volumes of eroded sediment. Manuscript profile
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  2 - Polymer inclusion membranes for the extraction of rare earth elements
  Zahra Daneshfar
  The demand for rare earth elements has increased significantly due to potential industrial applications such as catalysts, magnets, battery alloys, ceramics. However, the separation and recovery of rare earth metals are very difficult due to their similar chemical prope More

  The demand for rare earth elements has increased significantly due to potential industrial applications such as catalysts, magnets, battery alloys, ceramics. However, the separation and recovery of rare earth metals are very difficult due to their similar chemical properties and ionic radius, so progress in the separation process of these elements will bring many global benefits. Among the improved methods, the membrane technique has received much attention as a stable method with easy operation in the separation of such metals, and several membranes have been designed for separation. This article provides a summary of the types of membranes in the separation of rare earth elements in terms of extraction performance, transfer efficiency, and membrane stability. Polymer inclusion membranes are a new generation of non-liquid membrane that is made by a simple method of casting a solution containing liquid phases (carrier, plasticizer /modifier) and base polymers. Polymer inclusion membranes due to the possibility of simultaneous extraction and back-extraction, high selectivity, excellent stability, reusability, simple applicability, relatively low cost, and low energy consumption, it provides a great advantage in both the separation and purification of metal ions. Therefore, in this study, an overview of the PIMs reported in the studies to date is presented and the performance, permeability and stability of the membrane are discussed according to the base polymer, carrier, plasticizer and modifiers used. Manuscript profile
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  3 - Analysis of the content of political development in the documents upstream documents (Constitutional Law and the 20-year vision document of 1404)
  Moustafaa kavakebyan Azim Matin
  This research delves into the intricate facets of political evolution within the framework of the Islamic Republic of Iran, particularly focusing on the confluence of constitutional governance and strategic foresight. Underlining the imperative of a meticulous scrutiny More

  This research delves into the intricate facets of political evolution within the framework of the Islamic Republic of Iran, particularly focusing on the confluence of constitutional governance and strategic foresight. Underlining the imperative of a meticulous scrutiny of both the constitutional framework and the 20-year vision document of 1404, this inquiry probes into the reciprocal influence between the foundational precepts of the constitution, steeped in Islamic jurisprudence, and the transformative objectives delineated in the long-term perspective. Employing a methodical content analysis, the study scrutinizes the stance on political evolution as articulated in both the constitutional provisions and the 20-year horizon document, elucidating the nuanced dynamics that mold Iran's political trajectory. These revelations illuminate the state-driven, hierarchically structured nature of political advancement, underscoring the formidable task of harmonizing developmental initiatives with democratic principles and citizen engagement. This examination not only enriches scholarly discourse surrounding political progression but also furnishes policymakers with invaluable insights to navigate the distinctive socio-political terrain of the Islamic Republic of Iran. Lastly, this study underscores the constitutional emphasis on citizen participation and democratic values as pivotal components for fortifying political and social equilibrium. Manuscript profile