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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.
Jin, H.,Ansari, M.B.,Park, S.E. Elsevier Science Publishers 2015 CATALYSIS TODAY - Vol.245 No.-
Sulfonic acid functionalized mesoporous ZSM-5 (SO<SUB>3</SUB>H-Meso ZSM-5) were prepared by post-grafting of 3-mercaptopropyltriethoxysilane with various loading in the range of 10-50wt% followed by oxidation of thiol using H<SUB>2</SUB>O<SUB>2</SUB> to generate the corresponding sulfonic acid group. Grafting of organic moieties was evidenced by elemental analysis, <SUP>29</SUP>Si &<SUP>13</SUP>C-NMR and X-ray photoelectron spectroscopy. The SO<SUB>3</SUB>H-Meso ZSM-5 catalyst with improved acidity and mesoporosity exhibited enhanced catalytic activity in acid-catalyzed liquid-phase reaction of 2'-hydroxyacetophenone and benzaldehyde compared with non-functionalized mesoporous ZSM-5 (Meso ZSM-5) and functionalized microporous ZSM-5 (SO<SUB>3</SUB>H-ZSM-5). The higher loading of sulfonic acid functional groups led to higher acidity and consequently resulted in higher yield of products. The catalyst could be reused up to three cycles without significant loss in its catalytic activity.
Khan, M.M.,Ansari, S.A.,Lee, J.,Cho, M.H. Elsevier 2013 Materials science & engineering. C, Materials for Vol.33 No.8
A novel nonenzymatic sensor for H<SUB>2</SUB>O<SUB>2</SUB> was developed based on an Ag@TiO<SUB>2</SUB> nanocomposite synthesized using a simple and cost effective approach with an electrochemically active biofilm. The optical, structural, morphological and electrochemical properties of the as-prepared Ag@TiO<SUB>2</SUB> nanocomposite were examined by UV-vis spectroscopy, X-ray diffraction, transmission electron microscopy and cyclic voltammetry (CV). The Ag@TiO<SUB>2</SUB> nanocomposite was fabricated on a glassy carbon electrode (GCE) and their electrochemical performance was analyzed by CV, differential pulse voltammetry and electrochemical impedance spectroscopy. The Ag@TiO<SUB>2</SUB> nanocomposite modified GCE (Ag@TiO<SUB>2</SUB>/GCE) displayed excellent performance towards H<SUB>2</SUB>O<SUB>2</SUB> sensing at -0.73V in the linear response range from 0.83μM to 43.3μM, within a detection limit and sensitivity of 0.83μM and ~65.2328+/-0.01μAμM<SUP>-1</SUP>cm<SUP>-2</SUP>, respectively. In addition, Ag@TiO<SUB>2</SUB>/GCE exhibited good operational reproducibility and long term stability.
Seo, H. K.,Ansari, S. A.,Parveen, N.,Qadir, S.,Fouad, H.,Shin, H. S.,Cho, M. H.,Ansari, S. G.,Ansari, Z. A. Chapman and Hall 2017 Journal of materials science Materials in electron Vol. No.
<P>Extensive research have been made in improving the dye sensitized solar cells (DSSC) performance by designing, tailoring and enhancing the photoconversion properties of the matrix. The approaches used are material synthesis, dye permutation combinations, use of natural extracts or using several sensitizers. The polymers are also being explored in this regards in their pristine or composite forms. Therefore, in this study an attempt is made to synthesize a mesoporous polyaniline-titanium dioxide (PANI-TiO2) nanocomposites with one pot synthesis approach at different concentrations of PANI (0.3-0.7 ml). Titanium isopropoxide was used as precursor for TiO2 with aniline and the material was synthesized at ice bath temperature. Morphological observations showed that the composite is a mesoporous material with tubular structure where TiO2 particles are seen entrapped in the polymer matrix and found that intercalation can be tailored with PANI concentration. Structural, functional and optical characterization indicate anatase phase of TiO2, with several functional bands that can help in dye interaction and broad absorption bands within visible region. The photocurrent-voltage response was measured with simulated light and source-meter. It is interesting to note that increasing PANI concentration enhances the mesoporous structure and hence increases the dye loading capacity and photoconductivity of the material. The efficiency increased by about 22 % with addition of 0.5 ml of PANI from 0.3 ml. The proposed study has indicated that such material have the potential to be used for DSSC fabrication with which the device performance can further be increased to a better levels.</P>
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.
Secrecy performance of a-k-u shadowed fading channel
A.S.M. Badrudduza,S.H. Islam,M.K. Kundu,I.S. Ansari 한국통신학회 2023 ICT Express Vol.9 No.2
In this paper, the physical layer security aspects of a wireless framework over shadowed (AKMS) fading channel are examined by acquiring closed-form novel expressions of average secrecy capacity, secure outage probability (SOP), and strictly positive secrecy capacity. The lower bound of SOP is derived along with the asymptotic expression of SOP at the high signal-to-noise ratio regime in order to achieve secrecy diversity gain. Capitalizing on these expressions, the consequences due to the simultaneous occurrence of fading and shadowing are quantified. Finally, Monte-Carlo simulations are demonstrated to assess the correctness of the expressions.
Max<sub>R</sub>(M) AND ZARISKI TOPOLOGY
ANSARI-TOROGHY, H.,KEIVANI, S.,OVLYAEE-SARMAZDEH, R. 호남수학회 2006 호남수학학술지 Vol.28 No.3
Let R be a commutative ring and let M be an R-module. Let X = $Spec_R(M)$ be the prime spectrum of M with Zariski topology. In this paper, by using the topological properties of X, we will obtain some conditions under which $Max_R(M)=Spec_R(M)$.