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Ansari, M.O.,Khan, M.M.,Ansari, S.A.,Amal, I.,Lee, J.,Cho, M.H. North-Holland 2014 Materials letters Vol.114 No.-
Highly conducting nanocomposite film of polyaniline (Pani) with graphene (GN) was prepared by incorporating GN nanoplatelets in Pani matrix, followed by sulfonating it with fuming sulfuric acid. Sheet-like GN nanoplatelets were distributed uniformly in a Pani matrix, leading to high electrical conductivity due to π-π interaction between sulfonated Pani (s-Pani) and GN. Studies of the thermoelectrical behavior and ammonia-sensing behavior on GNσ-Pani showed high DC electrical conductivity retention under ageing conditions as well as excellent reproducible sensing response towards ammonia vapor in contrast to acid-protonated Pani.
Determination of Wool Follicle Characteristics of Iranian Sheep Breeds
Ansari-Renani, H.R.,Moradi, S.,Baghershah, H.R.,Ebadi, Z.,Salehi, M.,Momen, S.M. Seyed,Ansari-Renani, M.Y. Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.8
In this study wool follicle characteristics of Iranian sheep breeds were investigated. A total of 242 male and female sheep of different age from 5 breeds were studied. Samples of skin were taken from the right midside to determine follicle characteristics. Overall averages for males and females were $3.7{\pm}0.1$ and $3.5{\pm}0.1$ for S/P ratio; $3.2{\pm}0.1$ and $3.6{\pm}0.1$ for primary follicle density; $12.1{\pm}0.7$ and $13.8{\pm}0.4$ for secondary follicle density; $15.3{\pm}0.7$ and $17.4{\pm}0.4$ for total primary plus secondary follicle density; $2.3{\pm}0.2$ and $3.5{\pm}0.3$ for percentage of inactive secondary follicles. Significant differences were found in some follicle characteristics between sheep breeds. Results of this study showed that sheep breeds raised in different parts of Iran characterized by a low S/P ratio and follicle density could be classed as carpet wool breeds.
Ansari, M.O.,Ansari, S.P.,Yadav, S.K.,Anwer, T.,Cho, M.H.,Mohammad, F. Korean Society of Industrial and Engineering Chemi 2014 Journal of industrial and engineering chemistry Vol.20 No.4
Electrically conductive HCl-doped multi-walled carbon nanotube (MWCNT)/polyaniline (Pani) nanocomposites were prepared in the presence of cetyl-trimethylammonium bromide by in situ oxidative polymerization of aniline containing different amount of MWCNTs. Thus prepared Pani♂WCNT nanocomposites were characterized by FTIR, XRD, Raman spectroscopy, SEM and TEM. The stability in terms of their electrical conductivity retention was studied under isothermal and cyclic aging conditions. Pani♂WCNT nanocomposites showed increased thermal stability in terms of DC electrical conductivity retention with increasing MWCNT content. One of the Pani♂WCNT nanocomposites was also tested for ammonia sensing which showed good sensing response and high reproducibility.
MHAV: Multitier Heterogeneous Adaptive Vehicular Network with LTE and DSRC
S. Ansari,T. Boutaleb,S. Sinanovic,C. Gamio,I. Krikidis 한국통신학회 2017 ICT Express Vol.3 No.4
Enabling cooperation between vehicles form vehicular networks, which provide safety, traffic efficiency and infotainment. The most vital of these applications require reliability and low latency. Considering these requirements, this paper presents a multitier heterogeneous adaptive vehicular (MHAV) network. Comprising of transport operator or authority owned vehicles in high tier and all the other privately owned vehicles in low tier, integrating cellular network with dedicated short range communications. The proposed framework is implemented and evaluated in Glasgow city center model. Simulation results demonstrate that the proposed architecture outperforms previous multitier architectures in terms of latency while offloading traffic from cellular networks.
S. Sahmani,R. Ansari 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.9
Buckling analysis of nanobeams is investigated using nonlocal continuum beam models of the different classical beam theories namely as Euler-Bernoulli beam theory (EBT), Timoshenko beam theory (TBT), and Levinson beam theory (LBT). To this end, Eringen’s equations of nonlocal elasticity are incorporated into the classical beam theories for buckling of nanobeams with rectangular cross-section. In contrast to the classical theories, the nonlocal elastic beam models developed here have the capability to predict critical buckling loads that allowing for the inclusion of size effects. The values of critical buckling loads corresponding to four commonly used boundary conditions are obtained using state-space method. The results are presented for different geometric parameters, boundary conditions, and values of nonlocal parameter to show the effects of each of them in detail. Then the results are fitted with those of molecular dynamics simulations through a nonlinear least square fitting procedure to find the appropriate values of nonlocal parameter for the buckling analysis of nanobeams relevant to each type of nonlocal beam model and boundary conditions.analysis.
Ansari, Sajid Ali,Fouad, H.,Ansari, S.G.,Sk, Md Palashuddin,Cho, Moo Hwan Elsevier 2017 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.504 No.-
<P><B>Abstract</B></P> <P>The development of electrically conductive metal sulfide-based polymer nanocomposites for energy storage materials has been a major focus by researchers to solve the energy crisis. In this study, a simple and facile method was used to construct a nanocomposite by combining a mechanically exfoliated MoS<SUB>2</SUB> (M-MoS<SUB>2</SUB>) sheet with polyaniline (Pani) using a simple and scalable in-situ chemical oxidative polymerization method. The as-prepared nanocomposite (M-MoS<SUB>2</SUB>-Pani nanocomposite) was characterized further by usual basic spectroscopic techniques, such as X-ray powder diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller surface area analysis. The electrochemical supercapacitive characteristics of the M-MoS<SUB>2</SUB>-Pani nanocomposite was tested in a three-electrode assembly by obtaining cyclic voltammetric (CV) curves and galvanostatic charge-discharge (GCD) measurements. The results were compared with those of a C-MoS<SUB>2</SUB>-Pani nanocomposite that had been synthesized using bulk MoS<SUB>2</SUB>. The M-MoS<SUB>2</SUB>-Pani nanocomposite synthesized using exfoliated MoS<SUB>2</SUB> exhibited a higher specific capacitance of 510.12Fg<SUP>−1</SUP> at a current of 1Ag<SUP>−1</SUP> than the C-MoS<SUB>2</SUB>-Pani nanocomposite (225.15Fg<SUP>−1</SUP>), which was synthesized using bulk C-MoS<SUB>2</SUB> delivered. The enhanced electrochemical supercapacitive performance was correlated to the synergistic effect and chemical interactions between the Pani and MoS<SUB>2</SUB>, which provide high electrical conductivity and a sufficient empty state for electrode/electrolyte contact.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Highly visible light active Ag@ZnO nanocomposites synthesized by gel-combustion route
Ansari, S.A.,Khan, M.M.,Lee, J.,Cho, M.H. Korean Society of Industrial and Engineering Chemi 2014 Journal of industrial and engineering chemistry Vol.20 No.4
Highly visible light active 1% and 3% Ag@ZnO nanocomposites were synthesized via a gel combustion route using citric acid as a fuel. The formation of the nanocomposites with enhanced properties was confirmed using a range of characterization techniques, photocatalysis and photoelectrochemical studies. Compared to the pristine ZnO nanoparticles, the Ag@ZnO nanocomposites exhibited enhanced visible light photocatalytic activity for the degradation of methylene blue and photoelectrochemical response. A mechanism was proposed to account for the photocatalytic activities of the Ag@ZnO nanocomposite that showed the surface plasmon resonance (SPR) of Ag is an effective way of enhancing the visible light photocatalytic activities.
R. Ansari,S. Malakpour,M. Faghihnasiri,S. Ajori 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3
In some cases such as assembling nanodevices and nanobiosensing, the effect of electric filed on the mechanical properties of nanomaterials is important and should be taken into account. The aim of this work is to investigate the effect of electric field on the mechanical properties of hexagonal boron-nitride (h-BN) using density functional theory (DFT) calculations. The results show the high sensitivity of mechanical properties to the magnitude and direction of electric field. It is observed that imposing the electric field on the armchair direction, unlike the zigzag direction, increases the magnitude of elastic properties of h-BN especially in the case of Poisson's ratio. It is further observed that the electric field perpendicular to h-BN has a negligible effect on its mechanical properties.