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Extraordinary adsorption of acidic fuchsine and malachite green onto cheap nano-adsorbent derived from eggshell

Chinese Journal of Chemical Engineering 2020年第6期28卷 1591-1602页

作者： Atefeh Moosavi Ali Akbar Amooey Ali Alinejad mir mojtaba Hedayati Marzbali Faculty of Chemistry University of MazandaranBabolsarIran Department of Chemical Engineering University of MazandaranBabolsarIran Chemical&Environmental Engineering School of EngineeringRMIT UniversityMelbourneVictoria 3000Australia

Removal of dyestuffs such as Acidic Fuchsine(AF)and Malachite Green(MG)being present in many forms in industries is vital to protect water reservoirs from their catastrophic effects on the *** study attempts to effectively eliminate these dyes using a low-cost and eco-friendly ***,as a biocompatible by-product,was initially characterized,then some modifications were conducted,and its morphology and chemical structure were then examined through(Atomic force microscopy)AFM,(Fourier-Transform Infrared Spectroscopy)FTIR,(Energy-Dispersive X-ray Spectroscopy)EDS and(Brunauer–Emmett–Teller)BET *** revealed that the modifications on raw material gave rise to a natural nano-adsorbent presenting porous medium appropriate for targeted adsorbate molecules with the average particle size and average pore diameter of 54 and^2 nm,*** groups on the adsorbent surface were also of importance to assist the adsorption of AF and *** effect of contact time,adsorbent dose,solution p H and initial concentration was ***-second order model accurately correlated the experimental kinetic data for both ***,the participation of intra-particle diffusion along with film diffusion in controlling the process was *** isotherm model fitted very well to the equilibrium data for both dyes and maximum monolayer adsorption capacity of AF and MG was accordingly calculated to be 5000 and 3333.33 mg·g-1 *** inherent characteristics of eggshell make it a potential material to remove contaminants from wastewater in future applications.

关键词： Egg shell Acidic Fuchsine Malachite Green Ultrahigh adsorption

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Cell-based allometry:an approach for evaluation of complexity in morphogenesis

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Quantitative Biology 2023年第2期11卷 183-203页

作者： Ali Tarihi mojtaba Tarihi Taki Tiraihi Department of Computer Engineering Faculty of Computer Science and EngineeringShahid Behshti UniversityTehran 19839-69411Iran Department of Computer Engineering Sharif University of TechnologyTehran 11365-11155Iran Department of Anatomical Sciences School of Medical SciencesTarbiat Modares UniversityTehran 14117-13116Iran

Background:Morphogenesis is a complex process in a developing animal at the organ,cellular and molecular *** this investigation,allometry at the cellular level was ***:Geometric information,including the time-lapse Cartesian coordinates of each cell's center,was used for calculating the allometric coefficients.A zero-centroaxial skew-symmetrical matrix(CSSM),was generated and used for constructing another square matrix(basic square matrix:BSM),then the determinant of BSM was calculated(d).The logarithms of absolute d(Lad)of cell group at different stages of development were plotted for all of the cells in a range of development stages;the slope of the regression line was estimated then used as the allometric ***,the lineage growth rate(LGR)was also calculated by plotting the Lad against the logarithm of the *** complexity index at each stage was *** method was tested on a developing Caenorhabditis elegans ***:We explored two out of the four first generated blastomeres in *** *** ABp and EMS lineages show that the allometric coefficient of ABp was higher than that of EMS,which was consistent with the complexityindexas well ***:The conclusion of this study is that the complexity of the differentiating cells in a developing embryo can be evaluated by allometric scaling based on the data derived from the Cartesian coordinates of the cells at different stages of development.

关键词： embryogenesis allometry complexity C.elegans bioinformatics skew matrix morphogenesis

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GPGPU-parallelised hybrid finite-discrete element modelling of rock chipping and fragmentation process in mechanical cutting

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第2期12卷 310-325页

作者： mojtaba Mohammadnejad Sevda Dehkhoda Daisuke Fukuda Hongyuan Liu Andrew Chan School of Engineering College of Science and EngineeringUniversity of TasmaniaHobartTAS7001Australia CSIRO Minerals Resources Business UnitQCAT 1 Technology CourtPullenvaleQLD4069Australia Hatch BrisbaneQLD4000Australia Division of Sustainable Resources Engineering Faculty of EngineeringHokkaido UniversityHokkaidoJapan

Mechanical cutting provides one of the most flexible and environmentally friendly excavation *** has attracted numerous efforts to model the rock chipping and fragmentation process,especially using the explicit finite element method(FEM) and bonded particle model(BPM),in order to improve cutting *** study investigates the application of a general-purpose graphic-processing-unit parallelised hybrid finite-discrete element method(FDEM) which enjoys the advantages of both explicit FEM and BPM,in modelling the rock chipping and fragmentation process in the rock scratch test of mechanical rock *** input parameters of FDEM are determined through a calibration procedure of modelling conventional Brazilian tensile and uniaxial compressive tests of limestone,A series of scratch tests with various cutting velocities,cutter rake angles and cutting depths is then modelled using FDEM with calibrated input parameters.A few cycles of cutter/rock interactions,including their engagement and detachment process,are modelled for each case,which is conducted for the first time to the best knowledge of the authors,thanks to the general purpose graphic processing units(GPGPU) *** failure mechanism,cutting force,chipping morphology and effect of various factors on them are discussed on the basis of the modelled ***,it is concluded that GPGPU-parallelised FDEM provides a powerful tool to further study rock cutting and improve cutting efficiencies since it can explicitly capture different fracture mechanisms contributing to the rock chipping as well as chip formation and the separation process in mechanical ***,it is concluded that chipping is mostly owed to the mix-mode Ⅰ-Ⅱ fracture in all cases although mode Ⅱ cracks and mode Ⅰ cracks are the dominant failures in rock cutting with shallow and deep cutting depths,*** chip morphology is found to be a function of cutter velocdty,cutting depth and cutter rake angl

关键词： Numerical simulation Finite-discrete element method(FDEM) Rock cutting Chipping Cracking

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Nanocrystalline TiO_2-HClO_4:A novel,efficient and recyclable catalyst for the chemoselective N-Boc protection of amines under solvent-free conditions

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Chinese Chemical Letters 2013年第1期24卷 34-36页

作者： Farhad Shirini Seyyed Vahid Atghia mojtaba Ghazi Jirdehi Department of Chemistry College of ScienceUniversity of GuilanRasht 41335Islamic Republic of Iran

Nanocrystalline TiO2-HClO4, as newly reported catalyst, has been used as an efficient and reusable catalyst for the chernoselective N-Boc protection of amines. The clean, mild acidity condition, quantitative yields of products, short reaction time and low reaction temperature are attractive features of this reaction. In practice, this method is a combination of a satisfactory synthesis and more significantlv easy 13roduct isolation and 13urification.

关键词： Nanocrystalline TiO2-HClO4AminesN-Boc protectionSolvent-free conditions

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The E×B drift instability in Hall thruster using 1D PIC/MCC simulation

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Chinese Physics B 2020年第2期29卷 366-373页

作者： Zahra Asadi Mehdi Sharifian mojtaba Hashemzadeh Mahmood Borhani Zarandi Hamidreza Ghomi Marzdashti Physics Department Yazd UniversitySafaiyehYazdIran Faculty of Physics Shahrood University of TechnologyShahroodIran Laser and Plasma Research Institute Shahid Beheshti UniversityG.C.EvinTehranIran

The E×B drift instability is studied in Hall thruster using one-dimensional particle in cell(PIC)simulation *** using the dispersion relation,it is found that unstable modes occur only in discrete bands in k space at cyclotron *** results indicate that the number of unstable modes increases by increasing the external electric field and decreases by increasing the radial magnetic *** ion mass does not affect the instability ***,the results confirm that there is an instability with short wavelength and high ***,it is shown that the electron and ion distribution functions deviate from the initial state and eventually the instability is saturated by ion trapping in the azimuthal *** for light mass ion,the frequency and phase velocity are very high that could lead to high electron mobility in the axial direction.

关键词： plasma Hall thruster particle in cell(PIC)simulation drift instability

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On the Linear Convergence of the Approximate Proximal Splitting Method for Non-smooth Convex Optimization

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Journal of the Operations Research Society of China 2014年第2期2卷 123-141页

作者： mojtaba Kadkhodaie Maziar Sanjabi Zhi-Quan Luo University of Minnesota MinneapolisMNUSA

Consider the problem of minimizing the sum of two convex functions,one being smooth and the other *** this paper,we introduce a general class of approximate proximal splitting(APS)methods for solving such minimization *** in the APS class include many well-known algorithms such as the proximal splitting method,the block coordinate descent method(BCD),and the approximate gradient projection methods for smooth convex *** establish the linear convergence of APS methods under a local error bound *** the latter is known to hold for compressive sensing and sparse group LASSO problems,our analysis implies the linear convergence of the BCD method for these problems without strong convexity assumption.

关键词： Convex optimization Proximal splitting method Block coordinate descent method Convergence rate analysis Local error bound

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Biostratigraphy of Albian Sediments(Kazhdumi Formation)in Zagros Area(Southwest of Iran)

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Journal of Earth Science 2022年第2期33卷 435-451页

作者： mojtaba Keshavarzi Massih Afghah Abdolmajid Asadi Mahnaz Parvaneh Nejad Shirazi Department of Geology College Fars Science and Research BranchIslamic Azad UniversityFarsIran Department of Geology Shiraz BranchIslamic Azad UniversityShiraz 71987-74731Iran Department of Geology Shiraz BranchPayame Noor UniversityShirazIran

To investigate biostratigraphy of Albian sediments(Kazhdumi Formation)in the Zagros Basin,280 samples in four sections were prepared which are nominated as Murshan-e-Bala,Fahliyane-Pain,Kupon and *** distribution of identified foraminifers confirms well developed orbitolinids which are associated with other Albian benthic foraminifers in all studied *** orbitolinids are recognized in surrounding strata[Dariyan(at the base which is marked by an oxidized zone)and Sarvak Formations(on the top,as gradtional contact)]as well as the Kazhdumi *** biostratigraphic data show that Early Albian is marked by the presence of Hemicyclammina sigali,which co-occurs with Mesorbitolina texana and Mesorbitolina subconcava,whereas Conicorbitolina conica and Meorbitolina parva support Late Albian age of the studied *** algae are associated with both benthic faunal *** planktons occur in the studied sections which are identified as Favusella washitensis and Calcisphaerula inomminata *** stratigraphic position of planktons actually indicates vertical displacement in the sedimentary basin during Albian *** associated Albian pelagic foraminifera are identified which are obviously recognized in three sections of the Kazhdumi *** presence of pelagic species in the study section of the Kazhdumi Formation indicates basement faulting during the Albian period.

关键词： Kazhdumi Formation biostratigraphy albian foraminifera calcareous algae

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Investigating the Effects of the Driving Cycle and Penetration of Electric Vehicles on Technical and Environmental Characteristics of the Hybrid Energy System Considering Uncertainties

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Energy Engineering 2022年第5期119卷 1985-2003页

作者： Jiusong Chen Dejun Miao Yizong Dai mojtaba Ghadamyari Yangzhou Polytechnic College YangzhouChina Department of Electrical Engineering Faculty Shahid Beheshti UniversityTehranIran

Electric vehicles(EVs)have received special consideration from modern society over the past several *** EVs are a fine example of environmentally friendly technology and have many advantages,they relatively increase the electricity demand upon a power grid as ***,their negative impact on busvoltage and line losses should be *** this study,the effect of EV loads and their penetration on bus voltage and line losses of an IEEE-33 bussystem has been examined via two *** is important to mention that the effect of EVs on the rate of air pollution,produced by fossil fuel electricity generators,has been investigated throughout the ***,the key role of demand response programs in the reduction of EVs’negative effects on the grid has also been discussed in the last ***,the simulation of this paper provides a novel and wider perspective on EVs and their effect on grids and environmental pollution.

关键词： Electric vehicle buses’voltage line losses environmental pollution renewable resources demand response

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Optimal Synthesis of the Stephenson-Ⅱ Linkage for Finger Exoskeleton Using Swarm-based Optimization Algorithms

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Journal of Bionic Engineering 2023年第4期20卷 1569-1584页

作者： Seyyed mojtaba Varedi-Koulaei Masoud Mohammadi Mohammad Amin Malek Mohammadi Mahdi Bamdad Corrective Exercise and Rehabilitation Laboratory Department of Mechanical EngineeringShahrood University of TechnologyShahrood***Iran Department of Health Science and Technology Aalborg University9220AalborgDenmark

Active exoskeletons have been widely investigated to supplement and restore human hand movements,but a significant limitation is that they have a complicated design requiring multi *** Degree-Of-Freedom(DOF)planar linkage mechanisms could be used with simple *** research represents the design and optimization of a mechanism proposed for a finger exoskeleton bionic *** DOF six-bar linkage Stephenson-II is selected,and a motion-generation mechanism synthesis problem is *** design is based on the data obtained from the flexion/extension motion of the index finger through 16 precision points and 16 angles for each phalange associated with the fingertip *** explaining the kinematic analysis of the Stephenson-II,an evaluation of swarm intelligence techniques,including PSO,GWO,and ARO algorithms for solving optimization problems,is *** algorithm demonstrates the best performance among ***,the optimized mechanism in this study has a 50% error reduction compared to the one previously designed(Bataller et *** Mech Mach Theory 105:31-43,2016).

关键词： Mechanism synthesis Bionic Finger exoskeleton PSO GWO ARO

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Assessing roles of geochemical reactions on CO_(2)plume,injectivity and residual trapping

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Energy Geoscience 2021年第4期2卷 327-336页

作者： Abdiaziz Abdullahi Maalim Hisham Ben Mahmud mojtaba Seyyedi Curtin University Malaysia CDT250Miri98000SarawakMalaysia CSIRO GPO Box 1700Canberra ACT2601Australia

With increasing CO_(2)concentration in the atmosphere,CO_(2)geo-aequestration has become a popular technique to counter the dangers of global warming resulting from high levels of CO_(2)in the *** paper examins sequestration parameters such as CO_(2)plume behaviour,residual gas trapping and injectivity as a means of achieving safe and successful CO_(2)storage in saline *** precipitation/dissolution rates are used to establish a relationship between these parameters and geochemical reactions in saline *** achieve this,mechanistic models(6 models with different inputs,created using CMG e GEM,2016 and WINPROP,2016)are simulated using input data from literature and studying changes in fluids and formation properties as well as mineral precipitation/dissolution rates in aquifers when subjected to different conditions in the different *** results from the models show that high CO_(2)dissolution,which creates large CO_(2)plume,leads to high mineral dissolution/precipitation as results of increased fluid-rock interactions(geochemical reactions);whereas injectivity,although enhanced by CO_(2)-water cyclic injection,does not show much increase in bottom hole pressure when mineral trapping(thus geochemical reactions)is introduced into the *** study on residual gas trapping shows that high residual gas saturation leads to reduced mineral precipitation/dissolution due to the reduced amount of dissolved CO_(2)in ***,rapid changes in the bottom hole pressure at high residual gas saturation means that a formation that fosters high residual gas trapping,rather than CO_(2)dissolution in brine,is more likely to experience injectivity issues during the sequestration process.

关键词： Geochemical reactions CO_(2)plume Residual(gas)trapping Injectivity Mineral precipitation Mineral dissolution

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