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A. M. El‑Taher,A. F. Razzk 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
Preventing the formation of large platelets of Ag3Snintermetallic compounds (IMCs) during solidification of solder jointshas become a significant challenge in the design of Sn–Ag–Cu lead-free solder alloys. Large platelets of Ag3Snare generallyconsidered as undesirable as their presence can create solidification defects and causes mechanical property anisotropy. In the present work, the synergetic effects of adding 0.1 wt% of Fe, Co, Te and 2 wt% Bi to Sn–3.0Ag–0.7Cu (SAC 307)solder are studied in terms of the growth of large platelets Ag3SnIMCs and the resulting alloy’ creep resistance as well astheir thermal behavior. Although minor Fe, Co, Te and Bi alloying elements addition causes large increase in the degree ofundercooling from 3.4 to 22.3 °C with maintaining the pasty range and melting temperature at the same levels, the modifiedSAC307–FeTeCoBi alloy exhibits considerable increase in creep resistance (~ 10 times) and large fracture life-time thanSAC (307) solder at same stress levels and testing temperatures. This is attributed to the transition of Ag3SnIMCs from largeplatelets into fine needle-like morphology and formation of new (Cu,Co)6Sn5, FeSn2,SnTe IMCs and Bi particles, whichcould provide more obstacles for dislocation movement at the interphase boundaries.
Taher, Abu,Kim, Jin-Beom,Jung, Ji-Young,Ahn, Wha-Seung,Jin, Myung-Jong WILEY-VCH Verlag 2010 Chem Inform Vol.41 No.4
<P>ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.</P>
Measurement of Milwaukee Brace Pad Pressure in Adolescent Round Back Deformity Treatment
Taher Babaee,Mojtaba Kamyab,Amir Ahmadi,Mohammad Ali Sanjari,Mohammad Saleh Ganjavian 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.4
Study Design: In this prospective study, we measured the pad pressures of the Milwaukee brace in adolescent hyperkyphosis treatment. Purpose: We evaluated the skin-brace interface forces exerted by the main pads of the Milwaukee brace. Overview of Literature: A fundamental factor associated with brace effectiveness in spinal deformity is pad force adjustment. However, few studies have evaluated the in-brace force magnitude and its effect on curve correction. Methods: Interface forces at four pads of the Milwaukee brace were measured in 73 patients withround back deformity (mean age,14.04±1.97 years [range, 10–18]; mean initial Cobb angle,67.70°±9.23° [range, 50°–86°]). We used a modified aneroid sphygmomanometer to measure the shoulder and kyphosis pad pressures. Each patient underwent measurement in the standing and sitting positions during inhalation/exhalation. Results: The mean pad pressures were significantly higher in the standing than in thesitting position, and significantly higher pressures were observed during inhalation compared toexhalation (p =0.001).There were no statistically significant differences between right and left shoulder pad pressures (p >0.05); however, the pressure differences between the right and left kyphosis pads were statistically significant (p <0.05). In a comparison of corrective forces with bracing for less or more than 6 months, corrective force was larger with bracing for less than 6 months (p =0.02). In the standing position, there were no statistically significant correlations between pad pressures and kyphosis curve correction. Conclusions: In the sitting position, there was a trend toward lower forces at the skin-brace interface; therefore, brace adjustment in the standing position may be useful and more effective. There was no significant correlation between the magnitude of the pad pressures and the degree of in-brace curve correction.
Taher, M.A.,Dey, M.K.,Lee, Y.W. Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.4
The aim of the present study is to use the artificial roughness geometries in order to investigate the thermal and hydrodynamic behaviors in a rough microchannel using the most effective alternative method in micro-flows namely Lattice-Boltzmann Method (LBM). The rough surfaces are configured with triangular, trapezoidal and rectangular roughness elements with a relative roughness height 0~8% of the channel height. To analyze the roughness effects, the friction coefficients in terms of Poiseuille number (Pn), the rate of heat transfer in terms of Nusselt number (Nu) and the mass flow rate have been discussed at the slip flow regime, $0.01{\leq}Kn{\leq}0.10$, where Kn is the Knudsen number. Finally, the overall performance has been studied numerically. All of these numerical results for all kind of roughness geometries are compared with smooth microchannel.
Taher Yousefi,Ahmad Nozad Golikand,Mohammad Hossein Mashhadizadeh,Mustafa Aghazadeh 한국물리학회 2012 Current Applied Physics Vol.12 No.1
Manganese dioxide (MnO2) nanowires with diameter about 30e70 nm is achieved via a two-step process: first, template-free cathodic electrodeposition from aqueous solution of Mn(NO3)2 on steel substrate and followed by heat treatment. The temperature-annealed sample was studied by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM)methods and Fourier transform infrared (FT-IR) spectroscopy. The electrochemical performance of the MnO2 sample was studied by cyclic voltammetry (CV) and chronopotentiometry in Na2SO4 solutions. The sample showed excellent supercapacitive behavior. The specific capacitance (SC) of 237 F g-1 in a potential window of 0e0.9V was obtained at the scan rate of 2 mV s-1. The SC calculated from the chronopotentiometry data is about 246 F g-1. The SC was decreased by 16% after 1000 cycles. Manganese dioxide (MnO2) nanowires with diameter about 30e70 nm is achieved via a two-step process: first, template-free cathodic electrodeposition from aqueous solution of Mn(NO3)2 on steel substrate and followed by heat treatment. The temperature-annealed sample was studied by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM)methods and Fourier transform infrared (FT-IR) spectroscopy. The electrochemical performance of the MnO2 sample was studied by cyclic voltammetry (CV) and chronopotentiometry in Na2SO4 solutions. The sample showed excellent supercapacitive behavior. The specific capacitance (SC) of 237 F g-1 in a potential window of 0e0.9V was obtained at the scan rate of 2 mV s-1. The SC calculated from the chronopotentiometry data is about 246 F g-1. The SC was decreased by 16% after 1000 cycles.
Taher, Mohammad Ali,Mostafavi, Ali,Afzali, Darush,Rezaeipour, Ebrahim Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.8
This work assesses the potential of natural Analcime Zeolite as an adsorbent for preconcentration of lead (II) traces. Lead is quantitatively retained on 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol by column method with Analcime in the pH range of 5-6.5 and 2 mL $min^{?1}$ flow rate. Lead was removed from the column with 10.0 mL of 4 M hydrochloric acid and was determined by anodic stripping differential pulse voltammetry. 0.5ppb detection limit was obtained and linear dynamic range was 3 to $1.2{\times}10^5$ ppb in final solution with correlation coefficient of 0.999 and relative standard deviation of ${\pm}$ 1.2% (for eight replicate determination of 2.5 ${\mu}g\;mL^{?1}$ of lead). Various parameters such as the effect of pH, flow rate, instrumental conditions and interferences of some ions on the determination of lead have been studied in detail for optimization of conditions. The method was successfully applied for determination of lead in various samples.
Taher, Mohammad Ali Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.8
Thallium is quantitatively retained by 1,10-phenanthroline and tetraphenylborate onto benzophenone in the pH range 0-11 from a large volumes of aqueous solutions of various samples. After filtration, the solid mass consisting of thallium complex and benzophenone is dissolved with 5 mL of dimethylformamide and the metal was determined by flame atomic absorption spectrometric. About 0.4 ㎍ of thallium can be concentrated from 400 mL of aqueous sample, where its concentration is as low as 1.0 ng/mL. Eight replicate determinations of 8.0 ㎍/mL of thallium in final dimethylformamide solution gave a mean absorbance of 0.160 with a relative standard deviation of 1.7%. The sensitivity for 1% absorption was 0.22 ㎍/mL. The interference of a large number of anions and cations has been studied and the optimized conditions developed were utilized for the trace determination of thallium in various alloys and biological samples.
Pyrene-Tagged Ionic Liquids: Separable Organic Catalysts for S<sub>N</sub>2 Fluorination
Taher, Abu,Lee, Kyo Chul,Han, Hye Ji,Kim, Dong Wook American Chemical Society 2017 ORGANIC LETTERS Vol.19 No.13
<P>We prepared pyrene-substituted imidazolium-based ionic liquids (PILs) as organic catalysts for the S(N)2 fluorination using alkali metal fluoride (MF). In this system, the PIL significantly enhanced the reactivity of MF due to the phase transfer catalytic effect of the imidazolium moiety as well as the metal cation-pi (pyrene) interactions. Furthermore, this homogeneous catalyst PIL was easily separated from the reaction mixture using reduced graphene oxide by it pi-pi stacking with the pyrene of PIL.</P>
Evaluation of Various Heuristics Techniques for Home Energy Management Using Smart Grid
Taher M. Ghazal,Shahan Yamin Siddiqui,Muhammad Ubaidullah,Hafiz Muhammad Usama,Sidra Khan,Muhammad Adnan Khan 한국차세대컴퓨팅학회 2022 한국차세대컴퓨팅학회 학술대회 Vol.2022 No.10
Electric energy is the basic need for human survival on this earth as these needs increase with the rapid increase in population. It’s become a challenge to manage home energy with the current situation. Smart grid provided different techniques to overcome these challenges to meet the need. This paper presents the result of the different optimization techniques that give the best performance in reducing cost, PAR, and user discomfort. Based on results the best result techniques are also combined to make a hybrid model for more accuracy. This paper not only describes optimization techniques but also the limitations and features of these techniques.