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- 저자 : ( Yongping Xiong ) (검색결과 2 건)
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Critical Role of Mullite-type Oxides’ Surface Chemistry on Catalytic NO Oxidation Performance
Thampy, Sampreetha,Ashburn, Nickolas,Dillon, Sean,Liu, Chengfa,Xiong, Ka,Mattson, Eric C.,Zheng, Yongping,Chabal, Yves J.,Cho, Kyeongjae,Hsu, Julia W. P. American Chemical Society 2019 The Journal of Physical Chemistry Part C Vol.123 No.9
<P>By combining low energy ion scattering spectroscopy and density functional theory calculation, we study the surface composition and surface formation energy of AMn<SUB>2</SUB>O<SUB>5</SUB> (A = Sm, Bi) mullite-type oxides synthesized by different methods and their effects on NO catalytic performance. It is well-known that hydrothermal (HT) synthesis at low temperatures produces materials with higher specific surface areas (SSAs) compared with those synthesized by coprecipitation (CP) and high-temperature calcination; however, it is less clear how synthesis methods affect surface chemistry. We find that the NO oxidation performance of SmMn<SUB>2</SUB>O<SUB>5</SUB>-HT does not match the SSA increase when compared to the lower SSA SmMn<SUB>2</SUB>O<SUB>5</SUB>-CP. Combined experimental and theoretical investigation reveals that SmMn<SUB>2</SUB>O<SUB>5</SUB>-HT includes a higher fraction of inactive Sm-terminated surfaces, which explains its lower than expected activity. However, the surface chemistry change depends strongly on the A-site element. The exposed surfaces of BiMn<SUB>2</SUB>O<SUB>5</SUB>-CP are predominantly terminated by Bi and exhibit a very low activity, while BiMn<SUB>2</SUB>O<SUB>5</SUB>-HT contains active Mn-terminated surfaces. This study shows that catalytic performance is determined predominantly by surface chemistry, which depends critically on the A-site element and synthesis method and less by physical surface area.</P> [FIG OMISSION]</BR>
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( Zulfiqar A. Arain ),( Xuesong Qiu ),( Lujie Zhong ),( Mu Wang ),( Xingyan Chen ),( Yongping Xiong ),( Kiran Nahida ),( Changqiao Xu ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.1
Multipath Transport Control Protocol (MPTCP) is a transport layer protocol that enables multiple TCP connections across various paths. Due to path heterogeneity, it incurs more energy in a multipath wireless network. Recent work presents a set of approaches described in the literature to support systems for energy consumption in terms of their performance, objectives and address issues based on their design goals. The existing solutions mainly focused on the primary system model but did not discourse the overall system performance. Therefore, this paper capitalized a novel stochastically multipath scheduling scheme for data and path capacity variations. The scheduling problem formulated over MPTCP as a stochastic optimization, whose objective is to maximize the average throughput, avoid network congestion, and makes the system more stable with greater energy efficiency. To design an online algorithm that solves the formulated problem over the time slots by considering its min-drift-plus penalty form. The proposed solution was examined under extensive simulations to evaluate the anticipated stochastic optimized MPTCP (so-MPTCP) outcome and compared it with the base MPTCP and the energy-efficient MPTCP (eMPTCP) protocols. Simulation results justify the proposed algorithm's credibility by achieving remarkable improvements, higher throughput, reduced energy costs, and lower-end to end delay.
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