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Non-catalytic conversion of wheat straw,walnut shell and almond shell into hydrogen rich gas in supercritical water media

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Chinese Journal of Chemical Engineering 2016年第8期24卷 1097-1103页

作者： farid Safari Mohammad Salimi Ahmad Tavasoli abtin Ataei Department of Energy Engineering Science and Research Branch Islamic Azad University School of Chemistry College of science University of Tehran

Agricultural wastes as lignocellulosic biomasses are known as the major resources of bioenergy. These valuable resources can be converted into useful environmental friendly fuels and chemicals. Wheat straw, walnut shell and almond shell are the main agricultural wastes in Kurdistan province, Iran. This study investigates the hydrogen-rich gas production via gasification of these biomasses in supercritical water media. Experiments were performed first, in the base case condition using a stainless steel batch micro reactor system. Then, the effect of reaction time on the total gas yield and yield of hydrogen, were investigated. It was seen that the total gas yields and gasification efficiencies increased by increasing the reaction time to 30 min and then the total gas yield was approximately remained constant. Among three used feed stocks, wheat straw with higher amount of cellulose and lower amount of lignin had the highest total gas and hydrogen yields in shorter reaction *** maximum hydrogen yields of 7.25, 4.1 and 4.63 mmol per gram of wheat straw, almond shell and walnut shell occurred at 10, 15 and 20 min of reaction time, respectively.

关键词： Hydrogen Biomass Gasification Supercritical water media

Level Sets of Certain Subclasses of α-Analytic functions

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Journal of Partial Differential Equations 2017年第4期30卷 281-298页

作者： DAGHIGHI abtin WIKSTROM frank Mid Sweden University Holmgatan 10 SE-851 70 Sundsvall Sweden Center for Mathematical Sciences Lund University Box 118 SE-22100 Lund Sweden

for an open set V C Cn, denote by Mα （V） the family of α-analytic functions that obey a boundary maximum modulus principle. We prove that, on a bounded ＂harmonically fat＂ domain Ω C Cn, a function f ∈M a（Ω／f-1（0）） automatically sat- isfies f ∈M a（Ω）, if it is Caj-1smooth in the z/variable, α ∈ Zn＋ up to the boundary. for a submanifold U C Cn, denote by ma（U）, the set of functions locally approximable by α-analytic functions where each approximating member and its reciprocal （off the singularities） obey the boundary maximum modulus principle. We prove, that for a C3-smooth hypersurface, Ω, a member of ma （Ω）, cannot have constant modulus near a point where the Levi form has a positive eigenvalue, unless it is there the trace of a polyanalytic function of a simple form. The result can be partially generalized to C4-smooth submanifolds of higher codimension, at least near points with a Levi cone condition.

关键词： Polyanalytic functions q-analytic functions zero sets level sets a-analytic functions.

Production of hydrogen and syngas via pyrolysis of bagasse in a dual bed reactor

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Journal of Energy Chemistry 2013年第4期22卷 639-644页

作者： Morteza Shoja Mokhtar Akhond Babatabar Ahmad Tavasoli abtin Ataei Department of Energy Engineering Science and Research Branch of Islamic Azad University Department of Applied Chemistry School of ChemistryCollege of ScienceUniversity of Tehran

Pyrolysis of bagasse followed by thermal cracking of tar was carded out at atmospheric pressure using a dual bed reactor. The first bed was used for the pyrolysis and the second bed was used for thermal cracking of tar. Iron fillings were used as the packed bed material in the second bed. The effects of reaction time （20 to 40 rain）, reactor temperature （600 to 900 ℃） and packed bed height （40-100 mm） on the product （char, tar and gas） yield and gas （H2, CO, CO2, CH4, CnHm） composition were studied. Over the ranges of the experimental conditions used, the operating conditions were optimized for pyrolysis temperature around 850 ℃, a reaction time of 30 min and packed bed height of 100 mm, thus we could obtain a gas richer in hydrogen and carbon monoxide and poorer in carbon dioxide and hydrocarbons. It was observed that compared with single bed process, dual bed process increased the gas yield from 0.397 to 0.750 m3/kg and decreased the tar yield from 0.445 to 0.268 g/g while the heating value of the product gas remained almost constant （10-11 M J/m3）.

关键词： bagasse dual bed reactor hydrogen syngas yield

Postmortem CT in decedents with SARS-CoV-2 infection.A single institution experience

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forensic Sciences Research 2022年第2期7卷 255-260页

作者： Mariam Thomas fereidoun abtin Antoinette Roth Catherine Yim Anokh Pahwa Jeremy Paige Odey Ukpo Radiology UCLA Medical Center Olive ViewLos AngelesCAUSA University of California Los Angeles Los AngelesCAUSA Los Angeles Medical Examiner-Coroner’s Office Los AngelesCAUSA

Coronavirus disease 2019(COVID-19)caused by SARS-CoV-2 produced a global pandemic with significant *** autopsies are not routinely performed on all decedents with SARS-CoV-2 infection,postmortem CT(PMCT)may be valuable to provide additional information on the cause of death and risk factors known to be associated with an increased mortality in *** purpose of this manuscript is to review the PMCT findings in a series of 42 decedents with SARS-CoV-2 infection from our *** analysis of 42 decedents who had a positive postmortem nasopharyngeal swab for SARS-CoV-2 and had a PMCT were included in this *** were reviewed for pulmonary findings seen in COVID-19 and other organ *** the 42 decedents,although the majority had imaging findings in the lungs that would be consistent with COVID-19 and acute respiratory distress syndrome,in 14%of the decedents the SARS-CoV-2 infection was likely coincidental and the PMCT findings suggested that they died from other *** half of the decedents that died from COVID-19 had PMCT findings of vascular *** is useful to identify pulmonary and extra pulmonary findings in decedents with SARS-CoV-2 infection that can provide additional information,which may be useful for the forensic pathologist to help determine the underlying cause of death.

关键词： forensic sciences postmortem CT COVID-19 virtual autopsy SARS-CoV-2

Preparation and characterization of Ag^+ ion-exchanged zeolite-Matrimid~5218 mixed matrix membrane for CO_2/CH_4 separation

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Journal of Energy Chemistry 2016年第3期25卷 450-462页

作者： abtin Ebadi Amooghin Mohammadreza Omidkhah Hamidreza Sanaeepur Ali Kargari faculty of Chemical Engineering Tarbiat Modares University Department of Chemical Engineering Faculty of Engineering Arak University Department of Chemical Engineering Amirkabir University of Technology

In this work, the zeolite-Y was ion-exchanged by introducing silver cations into the framework of microsized nano-porous sodium zeolite-Y using a liquid-phase ion exchanged method. The Ag+ion-exchanged zeolite, was then embedded into the Matrimid5218 matrix to form novel mixed matrix membranes(MMMs). The particles and MMMs were characterized by ultraviolet-visible diffuse reflectance spectroscopy(UV–vis DRS), N2adsorption–desorption isotherm, X-ray diffraction(XRD), fourier transform infrared(fTIR) and scanning electron microscopy(SEM). furthermore, the effects of filler content(0–20wt%) on pure and mixed gas experiments, feed pressure(2–20 bar) and operating temperature(35–75 oC)on CO2/CH4transport properties of Matrimid/Ag Y MMMs were considered. Characterization results confirmed an appropriate ion-exchange treatment of the zeolites. The SEM results confirmed the superior interfacial adhesion between polymer and zeolites, particularly in the case of Matrimid/Ag Y *** is due to the proper silverous zeolite/Matrimid functional groups’ interactions. The gas permeation results showed that the CO2permeability increased about 123%, from 8.34 Barrer for pure Matrimid to18.62 Barrer for Matrimid/Ag Y(15 wt%). The CO2/CH4selectivity was improved about 66%, from 36.3 for Matrimid to 60.1 for Matrimid/Ag Y(15 wt%). The privileged gas separation performance of Matrimid/Ag Y(15 wt%) was the result of a combined effect of facilitated transport mechanism of Ag+ions as well as the intrinsic surface diffusion mechanism of Y-type zeolite. In order to survey the possibility of using the developed MMMs in industry, the CO2-induced plasticization effect and mixed gas experiment were accomplished. It was deduced that the fabricated MMMs could maintain the superior performance in actual operating conditions.

关键词： AgY zeolite Ion exchange Matrimid,MMMs CO_2/CH_4 selectivity

Experimental study on bearing capacity of shell strip footings near geotextile-reinforced earth slopes

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Journal of Central South University 2021年第8期28卷 2527-2543页

作者： Seyed ALI GHAffARI Elham SATTARI Amir HAMIDI Gholamhosein TAVAKOLI MEHRJARDI abtin fARSHI HOMAYOUN ROOZ Department of Civil Engineering School of EngineeringKharazmi UniversityTehranIran

from a financial point of view,urbanization frequently enforces the clients to construct superstructures near the slopes,giving rise to increasing the risk of building *** conducting a series of small-scale plate load tests,this work aims to investigate the effects of installing geotextile reinforcement layers in sandy slope and reducing the apex angle of triangular shell strip *** results show considerable effect of using geotextile-reinforced layers and decreasing the apex angle on the ultimate bearing capacity of shell *** increasing foundation distance from the slope,the adverse effect of the slope is ***,as the distance decreases,the effect of reinforcement and apex angle is *** practical applications,empirical equations are also presented for determining the ultimate bearing capacity of the footings and scale effect as ***,3D numerical simulations are executed and compared with the experimental results.

关键词： slope shell strip footing geotextile-reinforced apex angle ultimate bearing capacity numerical simulation

Merging bound states in the continuum in an open acoustic resonator

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 124-131页

作者： Lujun Huang Bin Jia Artem S.Pilipchuk Sibo Huang Chen Shen Almas f.Sadreev Yong Li Andrey E.Miroshnichenko School of Physics and Electronic Sciences East China Normal University Institute of Acoustics Tongji University L.V.Kirensky Institute of Physics Department of Mechanical Engineering Rowan University School of Engineering and Technology University of New South Wales at Canberra

Bound states in the continuum （BICs） are perfectly localized resonances despite embedding in the continuum ***,an isolated BIC is very sensitive to the structure ***,we report merging acoustic BICs in a single open resonator,robust against the structure *** find that both symmetry-protected BIC and friedrich-Wintgen BIC are sustained in a single coupled waveguide-resonator *** varying the height and length of the resonator,these two BICs move toward each other and merge into a single one at a critical *** to an individual BIC,the merged BIC is robust against fabrication error because its Q-factor is proportional to ΔL-4,whereΔL embodies the structure *** essence of this extraordinary phenomenon is perfectly explained by the two-and three-level approximations of the effective nonHermitian ***,we present direct experimental demonstrations of the moving and merging of BICs in a coupled 3D waveguide-resonator,which are evidenced by the vanishing of the linewidth of fano resonance in the transmission *** results may find exciting applications in designing high-quality acoustic sources,sensors and filters.

关键词： acoustic resonances bound state in the continuum high-Q resonances