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RISS 인기검색어
- 검색키워드
- 저자 : Muhammad Asim Farid (검색결과 3 건)
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Structural, Magnetic and Dielectric Properties of Perovskite (Tb0.874Mn0.106)Mn1-xNixO3-δ
Muhammad Asim Farid,Guobao Li,Jianhua Lin,Attia Firdous,Sadaf ul Hassan 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.3
(Tb 0.874 Mn 0.106 )Mn 1− x Ni x O 3−δ (0.0 ≤ x ≤ 0.20) solid solutions have been synthesized by solid state method. They all crystallizein orthorhombic Pnma space group with perovskite structure at room temperature. The unit cell volume decreases with anincrease of Ni in (Tb 0.874 Mn 0.106 )Mn 0.80 Ni 0.20 O 3−δ . The samples show two magnetic orderings. The temperature dependentdielectric constant shows an abnormal step like increase for all the solid solutions. The dielectric constants decrease withan increase in frequency. The activation energies calculated from dielectric loss are related to the oxygen vacancies in thesamples.
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Asam Farid,Perveiz Khalid,Khan Zaib Jadoon,Muhammad Asim Iqbal,James Small 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.5
This study describes a method of combining geostatistical analysis with geophysical inversion of 1D electrical resistivity data acquired in the Bannu Basin, northwestern Himalayas of Pakistan. The data has been integrated and broadened from single dimension resistivity data into a 2D model that can be fully visualized and interpreted in a spatial sense. By interpreting and calibrating the electrical resistivity curves with the lithologies and geophysical logs of boreholes, it has been possible to identify unique sedimentary accumulations that occur throughout the basin. Through the use of variogram modelling the spatial extent of these accumulations can be identified and associated with measured hydraulic properties. It has become possible to map the extents and facies of the alluvial systems of the Bannu Basin formed during periods of heightened tectonic activity. The coarser sediments are associated with higher levels of resistivity as measured in the electrical surveys, whereas the finer sediments exhibit characteristically lower resistivities. Thus, the zones of high and low resistivity values become indicative of sediments associated with alluvial fans and lacustrine environments, respectively. The sediments of alluvial fans show relatively low gamma ray levels and higher transmissivities, whereas those of the piedmont deposits as well as lacustrine and sandy plains tend to show medium to high gamma ray values and lower transmissivities. Gross transmissivities were estimated by studying regression relationships between transmissivities measured in boreholes and the apparent formation factors of sediments. These relationships indicate an exponential increase in transmissivity with increasing apparent formation factor. These trends suggest a contrast in transmissivities between alluvial fan and other environments where lacustrine and sandy plains are characterized by low transmissivities. These estimated transmissivities do not represent absolute values but are merely indicative of any high or low trends in transmissivity of sediments, throughout the basin.
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Sadaf Ul Hassan,Sadaf Ahmad,Muhammad Asim Farid,Sohail Nadeem,Zulfiqar Ali,Rashid Abro,Aysha Mohyuddin,Muhammad Shahid Nazir,Murid Hussain,박영권 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-
Hydrodesulfurization is a common but less effective technique to remove sulfur content of oils due to severe operating conditions of temperature, pressure and cost. Oxidative desulfurization(ODS) is preferable due to low cost and mild operating conditions. Coupling of the extractive catalytic desulfurization with the ODS give rise to extractive catalytic oxidative desulfurization(ECODS), a more promising for the elimination of sulfur contents of fuel oil. Herein we present by polyoxometalate based hybrids, [H2TPP][K5BVW11O40]•2CH3CN•2H2O (1), [H2TPP]2[K3BVW11O40]•CH3CN•3H2O (2), and [H2TPP]3[KBVW11O40]•2CH3CN (3) for efficient ECODS of hazardous model fuel. These were synthesized by facile method and characterized by elemental analysis, inductive couple plasma, powder X-ray diffraction analysis, thermo-gravimetric/differential thermal analysis, fourier transform infrared, and UV–visible analysis. These polyoxometalate based hybrids contain cations [H2TPP]2+(organic) and [BVW11O40]7−(inorganic) with stoichiometric ratios(i.e., 1:1, 2:1, 3:1). The stoichiometry of these hybrids was also established by Job’s analysis which agreed well with the results of TG-DTA and elemental analyses. Interestingly, an increase in catalytic efficiency is observed with increase of organic cations. The maximum ∼99.5 % conversion of dibenzothiophene at 60 °C after 2 h has been achieved with hybrid 3 which could be employed up to ten cycles without a significant decrease in efficiency.
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