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- 검색키워드
- 저자 : Joshaghani, Mohammad (검색결과 5 건)
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Evaluation of incorporating metakaolin to evaluate durability and mechanical properties of concrete
Joshaghani, Alireza,Moeini, Mohammad Amin,Balapour, Mohammad Techno-Press 2017 Advances in concrete construction Vol.5 No.3
Concrete is known to be the most used construction material worldwide. The environmental and economic aspects of Ordinary Portland Cement (OPC) containing concrete have led research studies to investigate the possibility of incorporating supplementary cementitious materials (SCMs) in concrete. Metakaolin (MK) is one SCM with high pozzolanic reactivity generated throughout the thermal activation of high purity kaolinite clay at a temperature ranging from $500^{\circ}C$ to $800^{\circ}C$. Although many studies have evaluated the effect of MK on mechanical properties of concrete and have reported positive effects, limited articles are considering the effect of MK on durability properties of concrete. Considering the lifetime assessment of concrete structures, the durability of concrete has become of particular interest recently. In the present work, the influences of MK on mechanical and durability properties of concrete mixtures are evaluated. Various experiments such as slump flow test, compressive strength, water permeability, freeze and thaw cycles, rapid chloride penetration and surface resistivity tests were carried out to determine mechanical and durability properties of concretes. Concretes made with the incorporation of MK revealed better mechanical and durability properties compared to control concretes due to combined pozzolanic reactivity and the filler effect of MK.
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Optimization of Coupled Shear Walls Openings Dimensions under Static Loading using Continuous Method
Mohammad Vatandoust,Massoud Riyazi,Alireza Joshaghani,Mohammad Balapour 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.12
This paper presents a method for easy calculation of the optimum dimensions of the shear walls openings based on deformation and displacement of the wall in the roof elevation with the usage of the continuous method. By using the continuous method, researchers have tried to calculate the relationship between the displacement of the wall in the roof elevation with the openings dimensions. The displacement diagram of the wall at roof elevation will be plotted with respect to the defined parameters of the openings length to the walls length ratio and the percentage of the openings area to walls area ratio. Then, the openings dimension, which led to minimum displacement, will be chosen, and its alterations diagram versus the walls dimensions will be plotted. The effect of the parameters, such as the number of floors and loading type on the calculated optimum dimensions, which may change the results, has been shown. Two case studies of coupled shear wall under lateral load were considered. In both of them, the openings areas were analyzed with the ETABS program, first with optimal dimensions and then with non-optimal dimensions. The results were compared, and a simple method was presented for the calculation of the optimized dimensions of openings.
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Additional degree of freedom in phased-MIMO radar signal design using space-time codes
Vahdani, Roholah,Bizaki, Hossein Khaleghi,Joshaghani, Mohsen Fallah Electronics and Telecommunications Research Instit 2021 ETRI Journal Vol.43 No.4
In this paper, an additional degree of freedom in phased multi-input multi-output (phased-MIMO) radar with any arbitrary desired covariance matrix is proposed using space-time codes. By using the proposed method, any desired transmit covariance matrix in MIMO radar (phased-MIMO radars) can be realized by employing fully correlated base waveforms such as phased-array radars and simply extending them to different time slots with predesigned phases and amplitudes. In the proposed method, the transmit covariance matrix depends on the base waveform and space-time codes. For simplicity, a base waveform can be selected arbitrarily (ie, all base waveforms can be fully correlated, similar to phased-array radars). Therefore, any desired covariance matrix can be achieved by using a very simple phased-array structure and space-time code in the transmitter. The main advantage of the proposed scheme is that it does not require diverse uncorrelated waveforms. This considerably reduces transmitter hardware and software complexity and cost. One the receiver side, multiple signals can be analyzed jointly in the time and space domains to improve the signal-to-interference-plus-noise ratio.
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Davoud Yazdani,Ali Akbar Zinatizadeh,Mohammad Joshaghani 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
A novel graphitic carbon nitride g-C3N4-NiTi-layered double hydroxide heterojunction film photo-catalyst (g-C3N4-NiTi-LDH) was prepared by facile hydrothermal synthesis. The g-C3N4 and g-C3N4-NiTi-LDH film samples were characterized by AFM, SEM, EDX, PL, XRD and DRS analysis. DRS analysis indicated a significant red shift of absorption edge due to the interfacial coupling effect between g-C3N4 and NiTi-LDH. PL analysis showed an efficient inhibition of electron-hole recombination in the blended g-C3N4-NiTi-LDH. A fixed-bed photoreactor containing conjugated g-C3N4-NiTi-LDH film-coated glass was fabricated and employed to photocatalytic degradation of methyl orange (MO). As a result, the g-C3N4-NiTi-LDH film showed greater photocatalytic activity compared with pure samples of g-C3N4 and NiTi-LDH film samples. Maximum MO degradation efficiency (100%) was achieved using g-C3N4-NiTi-LDH films within 240 min.
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Arjomandi, Jalal,Moghanni-Bavil-Olyaei, Hamed,Parvin, Mohammad Hadi,Lee, Jin Yong,Chul Ko, Kyoung,Joshaghani, Mohammad,Hamidian, Kourosh Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.746 No.-
<P><B>Abstract</B></P> <P>The inhibition effect of a Schiff base with several functional groups on the corrosion of aluminum in alkaline solution is studied by experimental techniques and density function theory (DFT) calculations. The Schiff base are characterized by <SUP>1</SUP>HNMR, <SUP>13</SUP>CNMR, FT-IR, and CHN elemental analysis. In addition, different electrochemical and corrosion techniques such as weight loss, tafel polarization, electrochemical impedance spectroscopy (EIS) and optical microscopy images are performed to analyze the inhibiting performances. In the Tafel measurements the cathodic Tafel slopes values incurred small changes with increasing the inhibitor concentration, which revealed that the inhibitor was adsorbed on the aluminum surface. The inhibition efficiencies are calculated from weight loss measurement and electrochemical tests. The adsorption of the inhibitor onto the aluminum surface follows the Langmuir adsorption isotherm with the free adsorption energy of −8.66 kJ mol<SUP>−1</SUP>. The calculated adsorption energies and the amount of charge transfer obtained by DFT calculation revealed that corrosion inhibition effectively occurs with chemisorption, where new NAl bonds are formed between of N atoms in azo (–NN–) group and Al surface atoms, which is confirmed from <I>ab initio</I> molecular dynamics (AIMD) simulation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel Schiff base were synthesized as inhibitor for Al corrosion in alkaline. </LI> <LI> The Schiff base were characterized by <SUP>1</SUP>HNMR, <SUP>13</SUP>CNMR, FT-IR, and CHN. </LI> <LI> The inhibition effect of Schiff base were studied by experimental and DFT. </LI> <LI> The adsorption of inhibitor on Al surface follows Langmuir adsorption isotherm. </LI> <LI> The corrosion inhibitions is chemisorptions which confirmed by AIMD simulation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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