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Effect of recycled glass powder on asphalt concrete modification
M. Pourabbas Bilondi,S.M. Marandi,F. Ghasemi 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.59 No.2
During recent years researchers performed large effort to increase the service life and asphalt stability of the roads against traffic loads and weather conditions. Investigations carried out in various aspects such as changes in gradation, addition of various additives, changes in asphalt textures and etc. The objective of this research is to evaluate the advantages of adding recycled glass powder (RGP), Crumb Rubber (CR), styrene-butadiene rubber (SBR) and styrene butadiene styrene (SBS) to base bitumen with grade of 60/70 for modification of asphalt concrete. Initial studies conducted for determining the physical properties of bitumen and modifiers. A series of asphalt concrete samples made using various combinations of RGP, CR, SBR, SBS and base bitumen. All samples tested using Indirect Tensile Strength (ITS), Indirect Tensile Strength Modulus (ITSM) and Marshall Stability Tests. The new data compared with the results of control samples. The results showed that replacing RGP with known polymers improved ITS and ITSM results considerably. Also the Marshall Stability of modified mixtures using RGP is more than what is found for the base blend. Ultimately, the new RGP modifier had a huge impact on pavement performance and results in high flexibility which can be concluded as high service life for the new modified asphalt concrete.
TRIDIAGONALITY OF J-NORMAL AND J-CONJUGATE NORMAL HESSENBERG MATRICES
M. GHASEMI KAMALVAND,K. NIAZIASIL 한국산업응용수학회 2020 Journal of the Korean Society for Industrial and A Vol.24 No.1
In this parer we express the sufficient conditions under which it is proved that a J-normal irreduciable Hessenberg matrix is tridiagonal and it is also proved that a similar statement exists for J-conjugate normal matrices.
M. Ghasemi,M. Naushad,N. Ghasemi,Y. Khosravi-fard 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The main goal of this study was to evaluate the performance of two new adsorbents, ash and Fe nanoparticles loaded ash (nFe-A) for the removal of Pb(II) from aqueous solution. Batch experiments were performed as a function of various experimental parameters. The adsorption studies included both equilibrium adsorption isotherms and kinetics. Equilibrium data fitted very well with the Langmuir isotherm model. Kinetics studies showed better applicability for pseudo-second-order model for both adsorbents. The regeneration studies showed promising regeneration potential of these adsorbents. The breakthrough capacities of ash and nFe-A for Pb(II) removal was found 25 and 30 mg g 1, respectively.
M. Ghasemi,Mu. Naushad,N. Ghasemi,Y. Khosravi-fard 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
Fig sawdust was used as a precursor for the production of activated carbon by chemical activation withH3PO4. The developed Fig sawdust activated carbon (FSAC) was used as a biosorbent for the removal ofPb(II) from aqueous solution. Highest adsorption of Pb(II) (95.8%) was found at pH 4. Equilibrium datafitted very well with the Langmuir isotherm model. Maximum adsorption capacity was determined80.645 mg g1 at pH 4. Kinetic studies demonstrated that the adsorption followed a pseudo second orderkinetics model. The negative value of DG8 confirmed the feasibility and spontaneity of FSAC for Pb(II)adsorption.
A METHOD FOR SOLVING OF LINEAR SYSTEM WITH NORMAL COEFFICIENT MATRICES
M. GHASEMI KAMALVAND,B.FARAZMANDNIA,M.ALIYARI 한국산업응용수학회 2020 Journal of the Korean Society for Industrial and A Vol.24 No.3
This study aims to generalize MINRES-N2 method [1]. It means that we tend to obtain an algorithm to transfer each normal matrix - that its eigenvalues belong to an algebraic curve of low degree k- to its condensed form through using a unitary similarity transformation. Then, we aim to obtain a method to solve a system of linear equations that its coefficient matrix is equal to such a matrix by utilizing it. Finally this method is compared to the well-known GMRES method through using numerical examples. The results obtained through examples show that the given method is more efficient than GMRES.
SOLVING THE GENERALIZED FISHER'S EQUATION BY DIFFERENTIAL TRANSFORM METHOD
Matinfar, M.,Bahar, S.R.,Ghasemi, M. The Korean Society for Computational and Applied M 2012 Journal of applied mathematics & informatics Vol.30 No.3
In this paper, differential transform method (DTM) is considered to obtain solution to the generalized Fisher's equation. This method is easy to apply and because of high level of accuracy can be used to solve other linear and nonlinear problems. Furthermore, is capable of reducing the size of computational work. In the present work, the generalization of the two-dimensional transform method that is based on generalized Taylor's formula is applied to solve the generalized Fisher equation and numerical example demonstrates the accuracy of the present method.
Electricity generation from rice straw using a microbial fuel cell
Hassan, S.H.A.,Gad El-Rab, S.M.F.,Rahimnejad, M.,Ghasemi, M.,Joo, J.H.,Sik-Ok, Y.,Kim, I.S.,Oh, S.E. Pergamon Press ; Elsevier Science Ltd 2014 International journal of hydrogen energy Vol.39 No.17
This study demonstrated electricity generation from rice straw without pretreatment in a two-chambered microbial fuel cell (MFC) inoculated with a mixed culture of cellulose-degrading bacteria (CDB). The power density reached 145 mW/m<SUP>2</SUP> with an initial rice straw concentration of 1 g/L; while the coulombic efficiencies (CEs) ranged from 54.3 to 45.3%, corresponding to initial rice straw concentrations of 0.5-1 g/L. Stackable MFCs in series and parallel produced an open circuit voltage of 2.17 and 0.723 V, respectively, using hexacyanoferrate as the catholyte. The maximum power for serial connection of three stacked MFCs was 490 mW/m<SUP>2</SUP> (0.5 mA). In parallelly stacked MFCs, the current levels were approximately 3-fold (1.5 mA) higher than those produced from the serial connection. These results demonstrated that electricity can be produced from rice straw by exploiting CDB as the biocatalyst. Thus, this method provides a promising way to utilize rice straw for bioenergy production.
J. Ghasemi*,S. Ghobadi,B. Abbasi,M. Kubista 대한화학회 2005 대한화학회지 Vol.49 No.3
25 oC±0.1에서 이온세기를 달리하면서 네 가지 수용성 비타민 - 엽산(비타민 B9 또는 Bo), 티아민(비타민 B1), 리보플라빈(비타민 B2) 및 피리독신(비타민 B6)-의 겉보기 산해리상수를 분광도법으로 결정하였다. 다른 이온세기에서 산도상수를 결정하기 위하여, 계량화학 개념에 기초한 정교하고 정교한 방법을 분광학적 적정 데이터에 적용하였다. 다른 이온세기에서 225-500 nm 영역에서 스펙트럼을 기록하였다. 다양한 이온세기에서 pH-흡광도 데이터를 일-, 이- 및 삼양성자 약산의 질량균형방정식에 컴퓨터 핏팅하는 방법을 이용하여 모든 비타민의 산도 상수를 계산하였다. 컴퓨터 프로그램 DATAN을 사용하여 스펙트럼 데이터로부터 원하는 정보를 추출하였다. 핏팅 과정에서 산도 상수, 순수한 형태의 스펙트럼 프로파일, 본포 도표 및 기타 인자분석 데이터를 얻었다. 산도상수에 대한 이온세기의 영향을 고찰하였다.
Strain-based seismic failure evaluation of coupled dam-reservoir-foundation system
Hariri-Ardebili, M.A.,Mirzabozorg, H.,Ghasemi, A. Techno-Press 2013 Coupled systems mechanics Vol.2 No.1
Generally, mass concrete structural behavior is governed by the strain components. However, relevant guidelines in dam engineering evaluate the structural behavior of concrete dams using stress-based criteria. In the present study, strain-based criteria are proposed for the first time in a professional manner and their applicability in seismic failure evaluation of an arch dam are investigated. Numerical model of the dam is provided using NSAD-DRI finite element code and the foundation is modeled to be massed using infinite elements at its far-end boundaries. The coupled dam-reservoir-foundation system is solved in Lagrangian-Eulerian domain using Newmark-${\beta}$ time integration method. Seismic performance of the dam is investigated using parameters such as the demand-capacity ratio, the cumulative inelastic duration and the extension of the overstressed/overstrained areas. Real crack profile of the dam based on the damage mechanics approach is compared with those obtained from stress-based and strain-based approaches. It is found that using stress-based criteria leads to conservative results for arch action while seismic safety evaluation using the proposed strain-based criteria leads to conservative cantilever action.
H. Mirjalali,M. Ghasemi,M. S. Labbafzadeh 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.5
This paper presents a comparative study on the progressive collapse behavior of eccentrically braced frames with diff erent types and topology. Progressive collapse analysis was conducted on a set of diagonal, Inverted-V and combined braced frames in a fi ve story building with diff erent braced bays under gravity and earthquake loads, simultaneously. Nonlinear dynamic analysis and alternate path method were performed to assess the progressive collapse-resisting capacity of these braced frames and determine the most critical locations of element loss as well as element removal impact factor. Diff erent scenarios of sudden columns and their adjacent braces removal were utilized to calculate the removal impact factor. The results show that the Inverted-V eccentrically braced frames with two braced bays have more robustness for mitigating progressive collapse due to fewer impacts. Moreover, the comparison of the impact factors of diff erent types of bracings indicates that the combined V and Inverted-V eccentrically braced frame (using V and Inverted-V braces in the consecutive stories alternately) is less vulnerable to progressive collapse respectively.