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- 저자 : Palange, E. (검색결과 2 건)
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Janneh, M.,De Marcellis, A.,Palange, E.,Tenggara, A.T.,Byun, D. Elsevier 2018 OPTICS COMMUNICATIONS - Vol.416 No.-
<P><B>Abstract</B></P> <P>We report on a novel very high Q -factor dual-band Terahertz perfect absorber composed of a metasurface located on top of a flexible polyimide spacer deposited on a silver ground layer. The metasurface is a 2D-array of plasmonic nanoantennas with the shape of two concentric square rings and a cylinder positioned at their centre. By performing numerical simulations, we studied the polarisation insensitive electromagnetic response of the absorber for incident angles varying from 0° up to ± 30°. The two resonant modes centred at <SUB> f 1 </SUB> = 1 .80 THz and <SUB> f 2 </SUB> = 2 .26 THz have Q -factors Q ( <SUB> f 1 </SUB> ) = 120 and Q ( <SUB> f 2 </SUB> ) = 94 and absorption coefficients A ( <SUB> f 1 </SUB> ) = 99 . 8 % and A ( <SUB> f 2 </SUB> ) = 99 . 6 %. Moreover, we investigated how the resonant mode frequencies change with the refractive index and thickness of transparent analytes adsorbed on the metasurface. In terms of the Refractive Index Units (RIU), we obtained sensitivities equal to 187.5 GHz/RIU and 360 GHz/RIU for the <SUB> f 1 </SUB> and <SUB> f 2 </SUB> resonance frequencies, respectively, and figure of merits up to FOM = 19 . 1 and <SUP> FOM ∗ </SUP> = 431 . These results make the dual-band absorber to be employed as a sensing device able to detect the presence and/or the physical/chemical modifications of the adsorbed analytes. Moreover, we investigated the dependence of the sensitivity as a function of slight modifications of the metasurface nanoantenna shape, demonstrating that a more homogeneous distribution of the electric field intensity on the metasurface improves the sensitivity of the absorber without affecting the Q -factors.</P>
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Leonard Olisa,Amadi Azubuike,Moses Pwafureino,Orisa Ebube,Guful Palang,Ola Victor,Adeleke Hezekiah,Aji Abubakar,Madawaki Salim 한국자원공학회 2025 Geosystem engineering Vol.28 No.2
To promote the utilisation of CO , steps to limit global warming to a global average temperature 2 below 2°C and net-zero emission future by 2050 this study investigated the effectiveness of CO2 and dissolved gas injection for enhanced oil recovery from a reservoir with transmissible and non- transmissible faults. Unlike previous studies focusing on either miscible or immiscible gas injection, this study investigated both and adopted an advanced hybrid modelling combination of solvent, Todd-Longstaff and miscibility models to reveal CO , oil and rock interactions in complex reservoirs 2 with transmissible and non-transmissible faults. The findings suggest oil recovery of up to 42% during miscible injection and 32% for dissolved gas injection. This study reveals the nuanced understanding of how structural complexities may influence EOR and carbon sequestration. While miscible CO2 injection appeared to be more efficient for early oil recovery and maintaining reservoir pressure, immiscible gas may hold a greater potential for sequestration. This study further identified the complexity of reservoir structures and addressed well placement, fluid dynamics and pressure maintenance as contributing factors to improved oil recovery or CO2 sequestration
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