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performance enhancement of water bath heater at natural gas city gate station using twisted tubes

Chinese Journal of Chemical Engineering 2020年第1期28卷 165-179页

作者： p.soleimani M.Khoshvaght-Aliabadi H.Rashidi H.Bahmanpour Department of Chemical Engineering Shahrood BranchIslamic Azad UniversityShahroodIran Department of Environment Shahrood BranchIslamic Azad UniversityShahroodIran

Natural gas is transported from producing regions to consumption regions by using transmission pipelines at high pressures. At consumption regions, the pressure of natural gas is reduced in city gate stations(CGSs). Before the pressure reduction process, the temperature of natural gas is increased usually by using a water bath heater,which burns natural gas as fuel, to protect against freezing of natural gas. These types of heat exchangers have a low efficiency and consume a lot of fuel to generate the required heat. In the current study, the twisted configuration of the heating coil is proposed and investigated to enhance the heat transfer through a water bath heater with a nominal capacity of 1000 m^3·h^-1. Firstly, the implementation procedure is validated with data collected from the CGS of Qaleh-Jiq(located in Golestan province of Iran). A very good agreement is achieved between the obtained results and the real data. Then, three different twist ratios are considered to examine the twisting effects. The proposed technique is evaluated in the terms of velocity, temperature, and pressure variations, and the results are compared with the conventional case, i.e. straight configuration. It is found that both the heat transfer rate and the pressure drop augment as the twist ratio is raised. Finally, it is concluded that the twisted tubes can reduce the length of the gas coil by about 12.5% for the model with low twist ratio, 18.75% for the model with medium twist ratio, and 25% for the model with high twist ratio as compared to the straight configuration.

关键词： Natural gas city gate station Water bath heater Heat transfer enhancement Twisted tube

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IDENTIFICATION OF ZUCCHINI YELLOW MOSAIC VIRUS （ZYMV） USING IMMONUCApTURE-REVERSE TRANSCRIpTION–pCR （IC-RT-pCR）

IDENTIFICATION OF ZUCCHINI YELLOW MOSAIC VIRUS （ZYMV） USIN...

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The ⅩⅤth International plant protection Congress

作者： S.Hosseini FARHANGI G.H.MOSAHEBI M.Koohi HABIBI M.OKHOVVAT p.soleimani Department of plant pathology ＆ Entomology College of Agriculture Tehran University Karaj 31587-11167 Iran Department of plant pathology ＆ Entomology College of Agriculture Tehran University Karaj 31587-11167 Iran Department of plant pathology ＆ Entomology College of Agriculture Tehran University Karaj 31587-11167 Iran Department of plant pathology ＆ Entomology College of Agriculture Tehran University Karaj 31587-11167 Iran Department of plant pathology ＆ Entomology College of Agriculture Tehran University Karaj 31587-11167 Iran

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Naturally fractured hydrocarbon reservoir simulation by elastic fracture modeling

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petroleum Science 2017年第2期14卷 286-301页

作者： Mehrdad soleimani Faculty of Mining Petroleum and Geophysics Shahrood University of Technology Shahrood Iran

Accurate fluid flow simulation in geologically complex reservoirs is of particular importance in construction of reservoir *** approaches in naturally fractured reservoir simulation involve use of unstructured grids or a structured grid coupled with locally unstructured grids and discrete fracture *** methods suffer from drawbacks such as lack of flexibility and of ease of *** this study,I combined fracture modeling by elastic gridding which improves flexibility,especially in complex *** proposed model revises conventional modeling fractures by hard rigid planes that do not change through *** is a dubious assumption,especially in reservoirs with a high production rate in the *** proposed elastic fracture modeling considers changes in fracture properties,shape and aperture through the *** strategy is only reliable for naturally fractured reservoirs with high fracture permeability and less permeable matrix and parallel fractures with less *** of elastic fracture modeling results with conventional modeling showed that these assumptions will cause production pressure to enlarge fracture apertures and change fracture shapes,which consequently results in lower production compared with what was previously *** is concluded that an elastic gridded model could better simulate reservoir performance.

关键词： Reservoir performance Discrete fracture model Naturally fractured reservoir History matching Elastic gridding

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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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The impact of persian oak (Quercus brantii Lindl.) on soil characteristics in a declining forest

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Journal of Forestry Research 2020年第6期31卷 2359-2366页

作者： Reza soleimani Ahmad Hosseini Crop and Horticultural Science Research Department Ilam Agricultural and Natural Resources Research and Education CenterAREEOIlamIran Forests and Rangelands Research Department Ilam Agricultural and Natural Resources Research and Education CenterAREEOIlamIran

Root activity has an important impact on soil development but we have little knowledge of the interaction of the root zone and soil genetic *** aim of this investigation was to study the interactions between soil chemical characteristics and root zone processes in a declining persian oak forest(Quercus brantii Lindl.).A randomized complete block design was used to investigate the long-term eff ect of persian oak on soil horizons,and the chemical and biological properties in two soil zones(under and outside the canopy).Results indicate that the rhizosphere zone had signifi cantly higher total organic carbon(TOC)than outside the canopy soil in the upper soil *** subsurface horizons,water-extractable organic carbon values were signifi cantly higher in rhizosphere than in non-rhizospheric *** biomass carbon(MBC)values in the rhizospheric zone decreased from the fi rst to the second *** MBC/TOC ratio indicated signifi-cant diff erences between the rhizosphere and soils outside of the canopy,with the exception of the subsurface *** the subsurface horizon of the rhizosphere,there was greater respiration of organic carbon(ΣCO 2/TOC)than in outside of canopy *** addition,root processes infl uenced pH,nitrogen fractions,and availability of phosphorus,potassium,iron,zinc and *** erences in soil characteristics between rhizospheric and non-rhizospheric zones were signifi cant in surface horizons due to higher root density than in deeper soil *** fi ndings indicate that persian oak(Quercus brantii Lindl.)roots infl uenced the main soil chemical properties,even in calcareous soils.

关键词： Declining forest persian oak Rhizosphere Soil horizons

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Er^(3+) ion concentration effect on transient and steady-state behavior in Er^(3+):YAG crystal

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Chinese physics B 2014年第10期23卷 248-253页

作者： Asadpour Seyyed Hossein Rahimpour soleimani H Department of physics University of Guilan

The effect of Er3＋ ion concentration on transient and steady-state behavior in 45-nm Er3＋：YAG crystal is investigated. It is shown that by changing the signal field, the coherent field and the concentration of Er3＋ ions in the crystal, the absorption, dispersion, and group index of the weak probe field can be adjusted. Also, it is found that the probe absorption occurs in the presence of population inversion and probe amplification is obtained in the absence of population inversion.

关键词： Er3+ ion concentration absorption dispersion group index

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Role of incoherent pumping and Er^(3+) ion concentration on subluminal and superluminal light propagation in Er^(3+)-doped YAG crystal

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Chinese physics B 2015年第1期24卷 269-274页

作者： Seyyed Hossein Asadpour H.Rahimpour soleimani Department of physics University of GuilanRasht Iran

We study the absorption-dispersion process and group index of weak probe field in a four-level Er^3＋：YAG *** find that the Er^3＋ion concentration and incoherent pumping field can influence the absorption-dispersion process and group index of weak probe field. Moreover, our results show that Er^3＋ion concentration plays a major role in lasing without inversion and absorption with inversion.

关键词： Er^3+ion concentration incoherent pumping field superluminal

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Solving Multi-period Interdiction via Generalized Bender's Decomposition

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Acta Mathematicae Applicatae Sinica 2017年第3期33卷 633-644页

作者： Maryam soleimani-ALYAR Alireza GHAFFARI-HADIGHEH Department of Applied Mathematics Azarbaijan Shahid Madani UniversityTabrizIran

This paper considers a novel formulation of the multi-period network interdiction problem. In this model, delivery of the maximum flow as well as the act of interdiction happens over several periods, while the budget of resource for interdiction is limit. It is assumed that when an edge is interdicted in a period, the evader considers a rate of risk of detection at consequent periods. Application of the generalized Benders decomposition algorithm considers solving the resulting mixed-integer nonlinear programming problem. Computational experiences denote reasonable consistency with expectations.

关键词： Bi-level programming network interdiction mixed-integer nonlinear programming generalized benders decomposition

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Thermodynamic Analysis of Liquefied Natural Gas(LNG)production Cycle in ApCI process

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Journal of Thermal Science 2012年第6期21卷 564-571页

作者： Shahrooz Abbasi Nezhad Bezhan Shabani Majid soleimani Department of Mechanical Engineering Langroud BranchIslamic Azad UniversityLangroudIran

The appropriate production of liquefied natural gas(LNG)with least consuming energy and maximum efficiency is quite *** this paper,LNG production cycle by means of ApCI process has been *** equilibrium equations and exergy equilibrium equations of each equipment in the ApCI cycle were *** equipments are described using rigorous thermodynamics and no significant simplification is *** some operating parameters as key parameters,influences of these parameters on coefficient of performance(COp)and exergy efficiency of the cascading cycle were *** results indicate that COp and exergy efficiency will be improved with the increasing of the inlet pressure of MR(mixed refrigerant)compressors,the decreasing of the NG and MR after precooling process,outlet pressure of turbine,inlet temperature of MR compressor and NG temperature after cooling in main cryogenic heat exchanger(MCHE).The COp and exergy efficiency of the ApCI cycle will be above 2% and 40%,respectively,after optimizing the key parameters.

关键词： LNG ApCI process Coefficient of performance Exergy efficiency

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phase control of group-velocity-based biexciton coherence in a multiple quantum well nanostructure

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Chinese physics B 2014年第10期23卷 139-146页

作者： Seyyed Hossein Asadpour H. Rahimpour soleimani Department of physics University of Guilan

A double cascade-type four-level multiple-quantum-well-based exciton-biexciton transitions are proposed. The study is carried out on a 4.8-rim ZnSe single-quantum well which is embedded into ZnMgSSe cladding layers and pseudomor- phically grown by molecular beam epitaxy on a （0 0 1） GaAs substrate. It is displayed that the exciton spin relaxation and relative phases between applied fields can influence the transient and steady-state behaviors of absorption, dispersion, and group velocity of two weak probe and signal fields. Also, transient behaviors of electron population of different levels are discussed. It is found that the probe or signal amplification occurs in the absence of population inversion.

关键词： exciton-spin relaxation biexciton coherence relative phase between applied fields

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