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Geochemical indices of soil development on basalt rocks in arid to sub-humid climosequence of Central Iran

Journal of Mountain Science 2020年第7期17卷 1652-1669页

作者： Ahmad HEIDARI alireza RAHEB Soil Science Department College of Agriculture and Natural ResourcesUniversity of TehranKarajP.O.Box 4111Iran

Quantitative weathering indices are efficient tools in determining the soil development from the underlying *** order to evaluate the effects of climate on the soils developed under an arid to sub-humid climosequence in central Iran,twenty soil-development indices were *** samples from six pedons were analyzed for routine physico-chemical and geochemical analyses using X-ray fluorescence(XRF).The lowest and highest calculated soil development indices were observed in the arid and sub-humid regions *** the studied indices,fifteen indices showed similar trends concerning the intensity of *** consistency of such trends reveals the feasibility of using these indices to evaluate basalt weathering rate and soil development in arid,semi-arid and sub-humid *** study demonstrated that,among the evaluated weathering indices,the Weathering Index of Parker(WIP)and mass transfer coefficient(τ)were the most proper indices for predicting basalt weathering *** is due to the fact that these indices use the highly mobile earth elements which are the most sensitive elements in basalt chemical *** calculated indices were subdivided into three subgroups including the ratios of mobile/immobile,mobile/mobile and immobile/mobile elements based on the elements used in their *** state of soil evolution was more accurately predicted compared to the other subgroups using the mobile/immobile subgroup of ***,the weathering indices calculated using the mobile elements are better indicators of weathering intensity,soil formation and the exogenous processes across the arid to sub-humid climosequence.

关键词： Basalt Climosequence Geochemical properties Aridisols Mollisols Inceptisols

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Ultrasonic irradiation and solvent effects on destabilization of colloidal suspensions of platinum nanoparticles

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Particuology 2014年第6期12卷 145-148页

作者： alireza Salabat Shima Soleimani Department of Chemistry Faculty of ScienceArak University

In this work,ultrasonic irradiation and destabilizer solvent were used for destabilizing colloidal platinum *** stabilized platinum nanoparticles were prepared in w/o microemulsion systems composed of sodium bis-（2-ethylhexyl） sulfosuccinate（AOT） and four different solvents,namely,cyclohexane,n-hexane,n-heptane,and *** recovery process of Pt nanoparticles from the colloidal systems was performed by exposing the colloidal samples to ultrasonic irradiation and applying various destabilizing *** of UV-visible spectra confirms that the quantity of Pt nanoparticles removed from the suspension depends on the length of time of the ultrasonic irradiation and the nature of the microemulsion oil phase.A critical time for the ultrasonic irradiation has been introduced for the phase separation of colloidal *** perform the solvent study,four destabilizer solvents,namely,dioxane,ethyl acetate,diethyl ether,and tetrahydrofuran,were used for breaking the colloidal suspension of platinum *** on the ’good solvent’ and ’poor solvent’ idea,it is verified that the effect of the destabilizer solvents on the aggregation process follows the following order：tetrahydrofuran 〉 ethyl acetate 〉dioxane〉 diethyl ether.

关键词： Colloid destabilization Ultrasonic irradiation Microemulsion Solvent effect

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A microemulsion method for preparation of thiol-functionalized gold nanoparticles

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Particuology 2018年第2期16卷 33-36页

作者： Somayeh Tianimoghadam alireza Salabat Department of Chemistry Faculty of Science Lorestan University 68137-1-7133 Khorramabad Iran Department of Chemistry Faculty of Science Arak University 38156-8-8349 Arak Iran Institue of Nanosciences & Nanotechnolgy Arak University 38156-8-8349 Arak Iran

A new microemulsion method using tetraoctylammonium bromide as a cationic surfactant has been formulated to fabricate thiol-functionalized gold nanoparticles, The nanoparticles were compared with those synthesized by the multistep Brust two-phase *** nanoparticle sizes and size distributions fabricated by the two methods were characterized by UV-vis ahsorbance spectroscopy and transmittance electron microscopy. The simple microemulsion method produced the same results as those obtained by the Brust method,

关键词： Gold nanoparticles Brust method Microemulsion Thiol-functionalized gold

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Functional roles of lncRNAs in the pathogenesis and progression of cancer

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Genes & Diseases 2021年第4期8卷 424-437页

作者： alireza Ahadi Department of Medical Genetics School of MedicineShahid Beheshti University of Medical SciencesTehran198396-3113Iran

Long noncoding RNAs(lncRNAs)act as regulators of gene expression and pivotal transcriptional regulators in cancer cells via diverse *** involves a variety of pathological and biological activities,such as apoptosis,cell proliferation,metastasis,and *** using microarray and RNA sequencing,it was identified that dysregulation of lncRNAs affects the tumorigenesis *** together,these lncRNAs are putative biomarker and therapeutic target in human *** this review,I discuss the latest finding regarding the dysregulation of some important lncRNAs and their diverse mechanisms of these lncRNAs in the pathogenesis and progression of certain cancers;also,I summarize the possible roles of lncRNAs in clinical application for diagnosis and prognosis of cancer.

关键词： Biomarker Cancer Dysregulation LncRNA NcRNA

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Modeling flame propagation speed and quenching distance of aluminum dust flame with spatially random distribution of particles

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Journal of Central South University 2017年第1期24卷 81-89页

作者： Mehdi Bidabadi alireza Khoeini Poorfar Combustion Research Laboratory School of Mechanical EngineeringIran University of Science and Technology(IUST)Narmak16846-13114TehranIran

In this research combustion of aluminum dust particles in a quiescent medium with spatially discrete sources distributed in a random way was studied by a numerical approach.A new thermal model was generated to estimate flame propagation speed in a lean/rich reaction *** speed for different particle diameters and the effects of various oxidizers such as carbon dioxide and oxygen on flame speed were *** was considered the inert *** addition,the quenching distance and the minimum ignition energy(MIE) were studied as a function of dust *** burning time models for aluminum were employed and their results were compared with each *** model was based on conduction heat transfer mechanism using the heat point source *** combustion of single-particle was first studied and the solution was *** the dust combustion was investigated using the superposition principle to include the effects of surrounding *** is found that larger particles have higher values of quenching distance in comparison with smaller particles in an assumed dust *** the increase of dust concentration the value of MIE would be decreased for an assumed particle *** random discrete heat sources method,the obtained results of random distribution of fuel particles in space provide closer and realistic predictions of the combustion physics of aluminum dust flame as compared with the experimental findings.

关键词： flame propagation speed random particle distribution quenching distance random discrete combustion aluminum

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Prediction of Seaward Slope Recession in Berm Breakwaters Using M5＇ Machine Learning Approach

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China Ocean Engineering 2016年第1期30卷 19-32页

作者： alireza Sadat HOSSEINI Mehdi SHAFIEEFAR Faculty of Civil and Environmental Engineering Tarbiat Modares University Tehran Iran

In the design process of berm breakwaters, their front slope recession has an inevitable rule in large number of model tests, and this parameter being studied. This research draws its data from Moghim＇s and Shekari＇s experiment results. These experiments consist of two different 2D model tests in two wave flumes, in which the berm recession to different sea state and structural parameters have been studied. Irregular waves with a JONSWAP spectrum were used in both test series. A total of 412 test results were used to cover the impact of sea state conditions such as wave height, wave period, storm duration and water depth at the toe of the structure, and structural parameters such as berm elevation from still water level, berm width and stone diameter on berm recession parameters. In this paper, a new set of equations for berm recession is derived using the M5＇ model tree as a machine learning approach. A comparison is made between the estimations by the new formula and the formulae recently given by other researchers to show the preference of new M5＇ approach.

关键词： berm breakwater recession experimental data M5' model tree machine learning method

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Parametric computational study on butterfly-shaped hysteretic dampers

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Frontiers of Structural and Civil Engineering 2019年第5期13卷 1214-1226页

作者： alireza FARZAMPOUR Matthew Roy EATHERTON Department of Civil and Environmental Engineering Virginia TechBlacksburgVA 24060USA

A parametric computational study is conducted to investigate the shear yielding, flexural yielding, and lateral torsional buckling limit states for butterfly-shaped links. After validating the accuracy of the finite element modeling approach against previous experiments, 112 computational models with different geometrical properties were constructed and analyzed including consideration of initial imperfections. The resulting yielding moment, corresponding critical shear force, the accumulation of plastic strains through the length of links as well as the amount of energy dissipated are investigated. The results indicate that as the shape of the butterfly-shaped links become too straight or conversely too narrow in the middle, peak accumulated plastic strains increase. The significant effect of plate thickness on the buckling limit state is examined in this study. Results show that overstrength for these links (peak force divided by yield force) is between 1.2 and 4.5, with straight links producing larger overstrength. Additionally, proportioning the links to delay buckling, and designing the links to yield in the flexural mode are shown to improve energy dissipation.

关键词： structural fuse hystcretic damper finite element analysis energy dissipation initial imperfection butterfly-shaped links

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Experimental investigation of the flow-induced motion of a square-section cylinder

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Journal of Hydrodynamics 2021年第2期33卷 301-310页

作者： alireza Modir Amirhossein Mohammadkhani Hamed Ahani Department of Mechanical and Materials Engineering Florida International UniversityMiamiUSA School of Mechanical Engineering Iran University of Science and TechnologyTehranIran Department of Mechanical Engineering University of North Carolina at CharlotteCharlotteUSA

The flow-induced motion(FIM)of an elastically mounted square-section cylinder is experimentally investigated over a wide range of Reynolds numbers(1.5×10^(4) 详细信息

The flow-induced motion(FIM)of an elastically mounted square-section cylinder is experimentally investigated over a wide range of Reynolds numbers(1.5×10^(4)

关键词： Flow-induced motion(FIM) vortex-induced vibration(VIV) square-section cylinder angle of attack towing-tanks water channel

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Non-Monotonic Lyapunov-Krasovskii Functional Approach to Stability Analysis and Stabilization of Discrete Time-Delay Systems

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IEEE/CAA Journal of Automatica Sinica 2020年第3期7卷 752-763页

作者： Younes Solgi alireza Fatehi Ala Shariati Advanced Process Automation and Control Research Group Industrial Control Center of ExcellenceFaculty of Electrical EngineeringK.N.Toosi University of TechnologyTehran 16317-14191Iran IEEE

In this paper, a novel non-monotonic Lyapunov-Krasovskii functional approach is proposed to deal with the stability analysis and stabilization problem of linear discrete time-delay systems. This technique is utilized to relax the monotonic requirement of the Lyapunov-Krasovskii theorem. In this regard, the Lyapunov-Krasovskii functional is allowed to increase in a few steps, while being forced to be overall decreasing. As a result, it relays on a larger class of Lyapunov-Krasovskii functionals to provide stability of a state-delay system. To this end, using the non-monotonic Lyapunov-Krasovskii theorem, new sufficient conditions are derived regarding linear matrix inequalities(LMIs)to study the global asymptotic stability of state-delay ***, new stabilization conditions are also proposed for time-delay systems in this article. Both simulation and experimental results on a p H neutralizing process are provided to demonstrate the efficacy of the proposed method.

关键词： Linear matrix inequality(LMI) non-monotonic Lyapunov-Krasovskii functional(NMLKF) pH neutralization plant stabilization state-delay system time-delay system

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Landfill site selection using multi cr iter ia decision making: Influential factors for comparing locations

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Journal of Environmental Sciences 2020年第7期32卷 170-184页

作者： Yashar Rezaeisabzevar alireza Bazargan Behzad Zohourian School of Environment College of EngineeringUniversity of Tehran141785311 TehranIran Department of Engineering Ferdowsi University of Mashhad*** MashhadIran

Although a lot of research has focused on energy recovery and recycling of valuable materials from wastes to reduce loads on landfills,landfilling is still an inseparable part of solid waste *** landfills potentially pose a risk to human health and the surrounding environment,landfill site selection is an important endeavor that has to be carried out with great *** a suitable location for landfills depends on several factors and is a complicated *** this paper,a comprehensive review of landfill site selection methods,with an emphasis on multi criteria decision making(multiple criteria decision analysis)has been *** indicate that the most frequently used methods are weighted linear combination(WLC),ordered weighted averaging(OWA),analytic hierarchy process(AHP),fuzzy analytic hierarchy process(F-AHP),TODIM,fuzzy TODIM,analytic network process(ANP),fuzzy-analytic network process(F-ANP),and grey systems theory,each of which is *** most widely used factors for selecting a landfill site are groundwater depth,surface water vicinity,elevation,land slope,soil permeability,soil stability,flooding susceptibility,lithology and stratification,faults,land use type,nearby settlements and urbanization,cultural and protected site vicinity,wind direction,roads,railways,proximity to building materials,pipelines and powerlines,and proximity to airports.

关键词： Sustainable urban planning Waste management Sanitary landfills Landfill siting Geographic information system

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