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RISS 인기검색어
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- 저자 : Zeeshan Rashid (검색결과 3 건)
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Zeeshan Rashid,Cecilia Devi Wilfred,Regupathi Iyyaswami,Arunagiri Appusamy,Murugesan Thanabalan 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
Dispersion of asphaltene in crude oil using ionic liquids (ILs) is being considered as a viable solution, inextraction and transportation processes. In this work, the interplay between asphaltene and ILs has beenstudied systematically to understand the effect of structural variation of ILs on asphaltene solubility. Theactivity coefficient of the total of 1517 ILs with different combinations of cation and anion of ILs forrepresentative asphaltene molecule (asphaltene) was estimated via COSMO-RS (Conductor-likeScreening Model for Real Solvents). COSMO_RS predictions were validated using experimental dataon asphaltene solubility. Among the studied ILs, asphaltene showed high solubility in imidazolium-basedILs with hydrophobic anions. The present approach paved a way forward to rationally understand theimpact of structural variation of ILs on their interaction with asphaltene molecule and to design new ILsfor the dispersion and stabilization of asphaltene.
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Zeeshan Tahir,Mamoon Ur Rashid,김성도,박윤창,Hong Nhan Tran,조신욱,김용수 한국전기전자재료학회 2024 Transactions on Electrical and Electronic Material Vol.25 No.1
Highly reflective distributed Bragg reflectors (DBRs) play significant in controlling and manipulating the spontaneous emission of light in photonic and optoelectronic devices. Herein, we report a systemic study based on the complete theoretical modeling and the fabrication of highly reflective DBR comprised of 7.5 periods of repeating TiO2/SiO2 thin films. Firstly, a computational model based on the transfer matrix method was used to simulate the reflectance, transmittance, and electric field intensity distribution across the DBR structure. Subsequently, fabrication was performed via the conventional electron beam evaporation technique. Interestingly, the as-grown DBR exhibits low surface roughness ~0.767 nm and sharp interfaces between the neighboring TiO2 and SiO2 films manifesting the high quality of the fabrication process. Consequently, an excellent consistency was observed between the simulated and the experimental reflectance and transmittance spectra confirming the successful growth of the 7.5 pairs DBR. Moreover, the high reflectance ~99.0% reflectance and the large stopband width ~190 nm in the range 600–800 nm indicates the superior performance of the as-fabricated DBRs and were therefore utilized to develop a highly reflective monolithic and a Tamm plasmon planar microcavities.
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Khambampati, Anil Kumar,Rashid, Ahmar,Ijaz, Umer Zeeshan,Kim, Sin,Soleimani, Manuchehr,Kim, Kyung Youn The Royal Society 2009 Philosophical transactions. Series A, Mathematical Vol.367 No.1900
<P>The monitoring of solid-fluid suspensions under the influence of gravity is widely used in industrial processes. By considering sedimentation layers with different electrical properties, non-invasive methods such as electrical impedance tomography (EIT) can be used to estimate the settling curves and velocities. In recent EIT studies, the problem of estimating the locations of phase interfaces and phase conductivities has been treated as a nonlinear state estimation problem and the extended Kalman filter (EKF) has been successfully applied. However, the EKF is based on a Gaussian assumption and requires a linearized measurement model. The linearization (or derivation of the Jacobian) is possible when there are no discontinuities in the system. Furthermore, having a complex phase interface representation makes derivation of the Jacobian a tedious task. Therefore, in this paper, we explore the unscented Kalman filter (UKF) as an alternative approach for estimating phase interfaces and conductivities in sedimentation processes. The UKF uses a nonlinear measurement model and is therefore more accurate. In order to justify the proposed approach, extensive numerical experiments have been performed and a comparative analysis with the EKF is provided.</P>
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