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Analytical expressions for determining the stability of cohesionless soil slope under generalized seismic conditions

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Journal of Mountain Science 2018年第7期15卷 1559-1571页

作者： SAHOO Pragyan Pradatta SHUKLA Sanjay Kumar mohyeddin alireza Discipline of Civil and Environmental Engineering School of Engineering Edith Cowan University Joondalup PerthWA 6027 Australia Fiji National University Suva Fiji and Chitkara University Himachal Pradesh India

In recent major earthquakes, the researchers have found the need for consideration of vertical seismic acceleration for the stability analysis of the man-made and natural slopes. However, in most past studies, the performance of slopes has been assessed by accounting only the horizontal seismic component of the ground motion, without giving due weightage to the effect of vertical component. In the present study, analytical expressions are derived to determine the factor of safety, yield seismic coefficient and consequently the seismic displacement of cohesionless soil slope under combined horizontal and vertical components of the ground motion. The derivation uses the Newmark's sliding block approach, in which the soil slope with a planar failure surface within the framework of conventional pseudo-static analysis is assumed to follow the Mohr-Coulomb failure criterion. The effects of vertical seismic coefficient on the stability of cohesionless slope have been studied through a set of graphical presentations for a specific range of soil parameters. It is observed that overlooking the effect of the vertical component of the ground motion on factor of safety and the displacement while designing the slope may be detrimental, resulting in the slope failure. The general expressions presented in this paper may be highly useful in the field of earthquake geotechnical engineering practice for designing the cohesionless soil slopes under combined horizontal and vertical seismic loads.

关键词：稳定性分析水平地震土壤参数表情设计实践地震系数研究人员干扰分析

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Emerging role of neuregulin-1beta1 in pathogenesis and progression of multiple sclerosis

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中国神经再生研究：英文版 2023年第1期18卷 133-134页

作者： Seyyed mohyeddin Ziaee Soheila Karimi-Abdolrezaee Department of Physiology and Pathophysiology Spinal Cord Research CenterRady Faculty of Health SciencesUniversity of ManitobaChildren Hospital Research Institute of ManitobaWinnipegMBCanada

Multiple sclerosis(MS)is a chronic immune-mediated disorder of the central nervous system(CNS)that causes focal demyelinating lesions,followed by axonal and neuronal *** genetic and environmental factors are found to be associated with MS *** MS etiology seems to be multifactorial and needs further elucidation,it is understood that the response of an immune system to specific myelin antigens triggers the onset of MS(Dendrou et al.,2015).However,how the autoimmune response initiates against myelin,and the cellular and molecular mechanisms underpinning the development and progression of MS are not fully ***,deconstructing MS pathogenesis is of paramount importance for identifying novel diagnostic and therapeutic targets for this complex disease.

关键词： pathogenesis sclerosis degeneration

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Modeling of anisotropic polydispersed composites by progressive micromechanical approach

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Applied Mathematics and Mechanics(English Edition) 2013年第3期34卷 363-370页

作者： A.mohyeddin A.FEREIDOON Department of Mechanical Engineering Semnan University

A progressive micromechanical method is presented in order to predict the elastic constants of polydispersed composites including multi-directional or randomly ori- ented reinforcement particles. Heterogeneities of various types are introduced into the matrices in a gradual manner. At each step, the Mori-Tanaka method is used to ob- tain the stiffness tensor of the intermediate medium used as a matrix of the following step. The proposed method is capable of introducing any kind of heterogeneities based on their dimensions, orientations, mechanical properties, and volume fractions to the ma- trix. Furthermore, suitable probability density functions can be defined for physical and structural parameters of the composite, including the level of the filler-matrix interfacial bonding, the aspect ratio, and the orientation of reinforcement particles. The efficiency of the iterative approach and the convergence of the solution are studied by computing the stiffness tensors of unidirectional and bidirectional particulate composites. The results of the present study are also compared with the literature data for a randomly oriented particulate composite.

关键词： polydispersed composite micromechanical modeling progressive homog-enization

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Study of microstructure and flexural properties of microcellular acrylonitrile-butadiene-styrene nanocomposite foams: experimental results

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Applied Mathematics and Mechanics(English Edition) 2015年第4期36卷 487-498页

作者： A.mohyeddin A.FEREIDOON I.TARAGHI Department of Mechanical Engineering Parand BranchIslamic Azad University Department of Mechanical Engineering Semnan University

In this paper, acrylonitrile-butadiene-styrene （ABS） nanocomposite foams are produced using carbon dioxide through the solid-state batch process. Microcellular closed-cell foams are produced with the relative density ranging from 0.38 to 0.97. The effects of the processing conditions on the density, morphology, and flexural properties of ABS and its nanocomposite foams are studied. It is found that nanoclay particles, as nucleating sites, play an important role in reducing the size of cells and increasing their number in the unit volume of foamed polymer, as well as increasing the flexural modulus of foam through reinforcing its matrix.

关键词： acrylonitrile-butadiene-styrene (ABS) polymer-clay nanocomposite mi-crocellular foam flexural property

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Improved Non-Covalent Biofunctionalization of Multi-Walled Carbon Nanotubes Using Carbohydrate Amphiphiles with a Butterfly-Like Polyaromatic Tail

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Nano Research 2010年第11期3卷 764-778页

作者： mohyeddin Assali Manuel Pernía Leal Inmaculada Fernández Pablo Romero-Gomez Rachid Baati Noureddine Khiar Instituto de Investigaciones Químicas C.S.I.C-Universidad de Sevillac/.Américo Vespucio49Isla de la CartujaSevilla 41092Spain Departamento de Química Orgánica y Farmacéutica Facultad de FarmaciaUniversidad de SevillaSevilla 41012Spain Instituto de Ciencias de Materiales de Sevilla C.S.I.C-Universidad de Sevillac/.Américo Vespucio49Isla de la CartujaSevilla 41092Spain Universitéde Strasbourg Facultéde Pharmacie CNRS/UMR 7199 Laboratoire des Systèmes Chimiques Fonctionnels BP 6002474 route du Rhin67400 IllkirchFrance

We have developed an efficient strategy for the non-covalent functionalization of multi-walled carbon nanotubes(MWCNTs)which allows a biomimetic presentation of carbohydrates on their surface byπ-πstacking *** strategy is based on the use of sugar-based amphiphiles functionalized with tetrabenzo[a,c,g,i]fluorene(Tbf),a polyaromatic compound with a topology that resembles a butterfly with open *** new carbohydrate-tethered Tbf amphiphiles have been synthesized in a straightforward manner using click *** reported method has been developed in order to improve the rather low ability of pyrene-based systems to exfoliate MWCNTs in *** means of thermogravimetric analysis(TGA),ultraviolet(UV),infrared(IR),and fluorescence spectroscopies the interaction between MWCNTs and the Tbf group has been found to be stronger than those involving pyrene-based amphiphilic *** resulting aggregates with a multivalent sugar exposition on their surface are able to engage in specific ligand-lectin interactions similar to glycoconjugates on a cell membrane.

关键词： Carbon nanotubes non-covalent functionalization tetrabenzo[a c g i]fluorene carbohydrates click chemistry biocompatible system

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A Study on Tectonic and Sedimentology in Order to Fault Rupture Potential in Coasts the Makran Sea

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Open Journal of Geology 2017年第9期7卷 1269-1286页

作者： mohyeddin Ahrari-Roudi Oceanography Department Marine Sciences Faculty Chabahar Maritime University Chabahar Iran

Makran zone is one of the largest accretionary wedges in the world. This research had used methods such as studies of Office and library, field observation and surveying that several field visits, sampling, registered structural evidence, Laboratory studies, Data analysis, interpretation and conclusions. The most important objective of this study is assessment of Tectonics and hazard Potential in Coasts the Oman Sea based on tectonics and sedimentology. The northward movement and subduction of Oman oceanic lithosphere beneath Iranian micro-plate at a very shallow angle and at high rate is responsible for active orogenesis and uplift. Detailed seismological and geological information in planning is extremely essential to avoid any disaster. It is to be remembered that seismicity does not remain fixed in an area but migrates slowly with time. Thus, the planners are expected to be more concerned with the building code and prevention strategies. It is also important to mention that the Coastal zones are always vulnerable to natural hazards and liquefaction. The geomorphology of an area is the first indicator of on-going tectonic activity. In order to measure the amount of deformation due to tectonic processes, the initial geometry of the geomorphic markers is reconstructed accurately. Study of sediments shows that abundant shell fragments organized in laminae also favor a storm origin. Storm deposits contain no internal mud layers and rarely contain pieces of mud. Maximum deposit thickness is near the shore, and landward thinning of the deposit is commonly abrupt. Storm deposits fill in topographic lows, and the upper surface is relatively uniform in elevation alongshore. Finally, landforms of tectonically active regions and sediments are controlling factors interactions between tectonic, sedimentary, climatic, and surficial processes.

关键词： Tectonics Sediments Makran Fault Rupture Potential Accretionary Wedges

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Improvement of Concrete Shear Wall Structures by Smart Materials

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Open Journal of Civil Engineering 2012年第3期2卷 87-95页

作者： Mehdi Ghassemieh Mohammad Reza Bahaari Seyed mohyeddin Ghodratian Seyed Ali Nojoumi Civil & Environmental Engineering Department University of California Los Angeles CA USA School of Civil Engineering University of Tehran Tehran Ira

Smart materials have found numerous applications in many areas in civil engineering recently. One class of these materials is shape memory alloy (SMA) which exhibits several unique characteristics such as superelasticity and shape memory effect. Due to these characteristics, research efforts have been extended to use SMA in controlling civil structures. This paper investigates the effectiveness of SMA reinforcements in enhancing the behavior of shear walls, especially when subjected to seismic excitations. Two ordinary and coupled shear walls were introduced as reference structures and were modeled by ABAQUS software. For improving the seismic response of the shear walls, vertical SMA reinforcing bars were proposed to be implemented like conventional steel reinforcements, throughout the height of the structures and in every connecting beam in the coupled shear wall system. The one dimensional superelastic model of SMA material was implemented in the computer software using FORTRAN code. The dynamic response of the shear walls subjected to seismic loading was investigated through time history analyses under El-centro and Koyna records. The results showed that using superelastic SMA material instead of steel bars caused remarkable reduction in residual displacement for both ordinary and coupled shear walls. In addition, SMA reinforcements could significantly decrease the maximum deflection of the coupled shear wall system.

关键词： Smart Material Shape Memory Alloy Shear Wall Superelasticity Seismic Behavio

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