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Large deflection behavior effect in reinforced concrete columns exposed to extreme dynamic loads

Frontiers of Structural and Civil Engineering 2020年第2期14卷 532-553页

作者： Masoud ABEDINI Azrul AMUTALIB Chunwei ZHANG javad mehrmashhadi Sudharshan Naidu RAMAN Roozbeh ALIPOUR Tohid MOM ENI Mohamed HMUSSA School of Civil Engineering Qingdao University of Technology.Qingdao 266033China Department of Civil and Structural Engineering Universiti Kebangsaan MalaysiaUKM BangiSelangor 43600Malaysia Department of Mechanical and Materials Engineering University of Nebraska-LincolnLincolnNE 68588United States Department of Architecture and Built Environment Universiti Kebangsaan MalaysiaUKM BangiSelangor 43600 Malaysia Department of Mechanical Engineering Mahshahr BranchIslamic Azad UniversitMahshahrIran

Reinforced concretes(RC)have been widely used in *** construction,one of the eritical elements carrying a high percentage of the weight is columns which were not used 1o design to absorb large dynamic load like surface *** study focuses on investigating blast load parameters to design of RC columns to withstand blast *** numerical model is based on finite element amalysis using *** results are validated against blast feld tests available in the *** of simulations are performed with changing blast parameters *** efects of various scaled distances on the nonlinear bchavior of RC *** to simulation results,the scaled distance has a substantial infuence on the blast response of RC *** lower scaled distance,higher peak pressure and larger pressure impulse are applied on the RC ***,keeping the scaled disance unchanged,increasing the charge weight or shorter standoff distance cause more damage to the RC *** studies are carried out to investigate the efects of scaled distance and charge weight on the damage degree and residual axial load carrying capacity of RC columns with various column width,longitudinal reinforcement ratio and concrete *** of this research will be used to asessmsent the efet of an explosion on the dynamic behavior of RC columns.

关键词： RC column scaled disance blast load LS-DYNA

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Context-dependency in medicine:how neuronal excitability influences the impact of dopamine on cognition

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Neural Regeneration Research 2025年第11期20卷 3225-3226页

作者： Mahboubeh Ahmadi Nahid Rouhi javad Mirnajafi-Zadeh Bechara J.Saab Department of Physiology Faculty of Medical SciencesTarbiat Modares UniversityTehranIran Mobio Interactive Pte.Ltd. SingaporeRepublic of Singapore

Dopamine,often termed the"feel-good"neurotransmitter,plays a crucial role in myriad physiological and psychological brain *** dopamine is primarily associated with pleasure,reward,and motivation,its effects can be quite complex;and this complexity is further compounded when examining how dopamine functions in typical versus disease-affected neural *** pa rticula r,epilepsy,characte rized by heightened brain excitability,is linked to cognitive dysfunction,and dopamine is implicated in elements of both its pathology and *** has been successful in describing the synaptic abnormalities believed to contribute to memory issues in epilepsy,aiding in the search for effective therapies for what persists as a major medical issue.

关键词： dopamine epilepsy primarily

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A Nonlinear Coordinated Approach to Enhance the Transient Stability of Wind Energy-Based Power Systems

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IEEE/CAA Journal of Automatica Sinica 2020年第4期7卷 1087-1097页

作者： Mohammad javad Morshed the Department of Electrical and Computer Engineering University of Louisiana at LafayetteLafayetteLA 70504 USA

This paper proposes a novel framework that enables the simultaneous coordination of the controllers of doubly fed induction generators(DFIGs) and synchronous generators(SGs).The proposed coordination approach is based on the zero dynamics method aims at enhancing the transient stability of multi-machine power systems under a wide range of operating conditions. The proposed approach was implemented to the IEEE39-bus power systems. Transient stability margin measured in terms of critical clearing time along with eigenvalue analysis and time domain simulations were considered in the performance assessment. The obtained results were also compared to those achieved using a conventional power system stabilizer/power oscillation(PSS/POD) technique and the interconnection and damping assignment passivity-based controller(IDA-PBC). The performance analysis confirmed the ability of the proposed approach to enhance damping and improve system’s transient stability margin under a wide range of operating conditions.

关键词： Doubly fed induction generator(DFIG) excitation controller multi-machine power system synchronous generator(SG) transient stability zero dynamics

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Scale adaptive simulation of vortex structures past a square cylinder

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Journal of Hydrodynamics 2018年第4期30卷 657-671页

作者： javad Aminian Faculty of Mechanical and Energy Engineering Shahid Beheshti University

The scale adaptive simulation（SAS） turbulence model is evaluated on a turbulent flow past a square cylinder using the open-source CFD package OpenF OAM 2.3.0. Two and three-dimensional simulations are performed to determine global quantities like drag and lift coefficients and Strouhal number in addition to mean and fluctuating velocity profiles in the recirculation and wake regions. SAS model is evaluated against the Shear Stress Transport k-ω（SST） model and also compared with previously reported results based on DES, LES and DNS turbulence approaches. Results show that global quantities along with mean velocity profiles are well-captured by 2-D SAS model. The 3-D SAS model also succeeded in providing comparable results with recently published DES study on Reynolds shear stress and velocity fluctuation components using about 12 times lower computational cost. It is shown that large values of the SAS model constant result in too dissipative behavior, so that proper calibration of the SAS model constant for different turbulent flows is vital.

关键词： Scale adaptive simulation (SAS) turbulence model bluff body mean and fluctuating properties anisotropic turbulence computational costs

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Iterative Algorithm with Mixed Errors for Solving a New System of Generalized Nonlinear Variational-Like Inclusions and Fixed Point Problems in Banach Spaces

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Chinese Annals of Mathematics,Series B 2013年第4期34卷 593-622页

作者： javad BALOOEE Department of Mathematics Sari Branch Islamic Azad University

A new system of generalized nonlinear variational-like inclusions involving A- maximal m-relaxed η-accretive （so-called, （A, η）-accretive in [36]） mappings in q-uniformly smooth Banach spaces is introduced, and then, by using the resolvent operator technique associated with A-maximal m-relaxed ~/-accretive mappings due to Lan et al., the exis- tence and uniqueness of a solution to the aforementioned system is established. Applying two nearly uniformly Lipschitzian mappings 81 and 82 and using the resolvent operator technique associated with A-maximal m-relaxed ~？-accretive mappings, we shall construct a new perturbed N-step iterative algorithm with mixed errors for finding an element of the set of the fixed points of the nearly uniformly Lipschitzian mapping Q = （S1, S2） which is the unique solution of the aforesaid system. We also prove the convergence and stability of the iterative sequence generated by the suggested perturbed iterative algorithm under some suitable conditions, The results presented in this paper extend and improve some known results in the literature.

关键词： A-Maximal m-relaxed η-accretive mapping System of generalized non-linear variational-like inclusion Resolvent operator technique Conver-gence and stability Variational convergence

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Dimeric quinacridone cyclophanes: Synthesis,structures,and photophysical properties

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Science China Chemistry 2011年第2期54卷 314-319页

作者： javad Iqbal State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University

Two novel quinacridone (QA) cyclophanes with intrinsic intramolecular dye-dye interactions have been designed and synthesized.X-ray crystal structures as well as detailed photophysical properties have been well *** two dyes have a major advantage that efficient fluorescence quenching can be observed even in their dilute solutions.A comparison of photophysical properties between the dimeric QA cyclophane and its reference monomeric counterpart indicates that the dimerization is predominant for the fluorescence quenching of QA dyes in *** study provided some model QA derivatives with dimeric structures for understanding the fluorescence quenching of QA dyes in solutions.

关键词： quinacridone cyclophanes dye-dye interactions photophysics fluorescence quenching

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Highly efficient [C8mim][Cl] ionic liquid accompanied with magnetite nanoparticles and different salts for interfacial tension reduction

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Chinese Journal of Chemical Engineering 2020年第1期28卷 46-53页

作者： Sajjad Hashemi javad Saien Department of Applied Chemistry Bu-Ali Sina UniversityHamedanIran

The 1-octyl-3-methylimidazolium chloride, [C8 mim][Cl] ionic liquid(IL) was used as a novel surfactant in n-heptane/water system. The interfacial tensions(IFT) were measured and corresponding variations were investigated. An IFT reduction of 80.8% was appropriate under the IL CMC of about 0.1 mol·L^-1 and stronger effects were achieved when magnetite nanoparticles and salts were present profoundly under alkaline p *** equilibrium IFT data were accurately simulated with the Frumkin adsorption model. Hereafter, the saturated surface concentration, equilibrium constant and interaction parameter were obtained and their variations were demonstrated. Further, emulsion stability and contact angle of oil/water interface over quartz surface were studied. The oil/water emulsion stability was hardly changed with nanoparticles;however, the stability of oil/water + IL emulsions was significantly improved. It was also revealed that the presence of sodium and calcium chloride electrolytes fortifies the IL impact, whereas sodium sulfate weakens. From dynamic IFT data and fitting with kinetic models, it was found that the IL migration toward interface follows the mixed diffusion–kinetic control model. Consequently, the IL diffusion coefficient and the appropriate activation energy were determined.

关键词： Imidazolium ionic liquids Interfacial tension Magnetite nanoparticle Emulsion stability Frumkin adsorption model Adsorption kinetic model

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Hybrid algorithms for handling the numerical noise in topology optimization

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Acta Mechanica Sinica 2020年第2期36卷 536-554页

作者： Pooya Rostami javad Marzbanrad Vehicle Dynamical Systems Research Laboratory School of Automotive EngineeringIran University of Science and TechnologyNarmakTehranIran

This paper presents new hybrid methods for the identification of optimal topologies by combining the teaching-learning based optimization(TLBO)and the method of moving asymptotes(MMA).The topology optimization problem is parameterizing with a low dimensional explicit method called moving morphable components(MMC),to make the use of evolutionary algorithms more ***-based solvers have good performance in solving large-scale topology optimization ***,in unconventional cases same as crashworthiness design in which there is numerical noise in the gradient information,the uses of these algorithms are *** standard evolutionary algorithms can solve such problems since they don’t need gradient ***,they have a high computational *** paper is based upon the idea of combining metaheuristics with mathematical programming to handle the probable noises and have faster convergence *** to the ease of computations,the compliance minimization problem is considered as the case study and the artificial noise is added in gradient information.

关键词： Topology optimization Teaching-learning based optimization Method of moving asymptotes Moving morphable components

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Association Schemes with at Most Two Nonlinear Irreducible Characters and Applications to Finite Groups

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Acta Mathematica Sinica,English Series 2019年第4期35卷 481-493页

作者： javad BAGHERIAN Department of Mathematics University of Isfahan

An irreducible character χ of an association scheme is called nonlinear if the multiplicity of χ is greater than 1. The main result of this paper gives a characterization of commutative association schemes with at most two nonlinear irreducible characters. This yields a characterization of finite groups with at most two nonlinear irreducible characters. A class of noncommutative association schemes with at most two nonlinear irreducible character is also given.

关键词： Association scheme character finite group group-like scheme multiplicity nonlinear

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Advances and opportunities in wind energy harvesting using plasma actuators:a review

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Clean Energy 2024年第1期8卷 197-225页

作者： javad Omidi Department of Chemical Engineering Columbia UniversityNew YorkNYUSA

The dielectric barrier discharge plasma actuator has been recognized as a leading technology for controlling fluid flow and has found remarkable applications in wind energy harvesting over the past *** turbine aerodynamics are critical in this concept and performance is mainly determined by flow controllers,although significant technical progress is still *** paper examines all the critical studies to investigate the potential application of plasma actuators for airflow control over wind *** approach has been divided into three categories:wind turbine airfoils,horizontal-axis wind turbines and vertical-axis wind turbines aerodynamic performance and generated ***,the potential functions of plasma actuators in current and future wind turbine generators are *** actuators offer promising solutions to increasing power output,minimizing torque fluctuations and enabling self-starting capabilities,particularly in vertical-axis wind *** adjusting blade pitch angles in conjunction with plasma actuators,significant improvements in airflow optimization and power extraction have been *** the advancements,challenges persist,such as determining optimal actuator placement and overcoming structural limitations,especially concerning 3D effects and high Reynolds *** plasma actuators enhance aerodynamic efficiency,their complexity needs to be balanced against marginal gains in power production,especially in high-megawatt turbines,for which controlling flow at low wind speeds is *** research must focus on the sustainable integration of plasma actuators,pitch angle adjustments and active control mechanisms to fully exploit the potential of wind energy for a sustainable future.

关键词： plasma actuator wind turbine aerodynamic performance generated power

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