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- 저자 : ( Baoan Li ) (검색결과 4 건)
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Robust-nonsmooth Kalman Filtering for Stochastic Sandwich Systems with Dead-zone
Baoan Li,Yonghong Tan,Lei Zhou,Ruili Dong 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1
In this paper, a robust-nonsmooth Kalman filtering approach for stochastic sandwich systems with deadzone is proposed, which can guarantee the variance of filtering error to be upper bounded. In this approach, thestochastic sandwich system with dead-zone is described by a stochastic nonsmooth state-space function. Then, inorder to approximate the nonsmooth sandwich system within a bounded region around the equilibrium point, alinearization approach based on nonsmooth optimization is proposed. For handling the model uncertainty causedby linearization and modeling, the robust-nonsmooth Kalman filtering method is proposed for state estimation ofthe stochastic sandwich system with dead-zones with model uncertainty. Finally, both simulation and experimentalexamples are presented for evaluating the performance of the proposed filtering scheme.
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Mei Li,Chunyu Du,Meichao Lan,Zhiye Sun,Rukang Liu,Baoan Li 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.3
A one-dimensional biofilm model was applied to illustrate the nitrogen conversion and removal within the heterogeneous biofilm attached on the gas-permeable membrane with different oxygen transfer coefficients: 7.5m/d, 1.5m/d and 0.3m/d. Integrating the ammonia-oxidizing bacteria-mediating hydroxylamine oxidization pathway during the autotrophic nitrification and the four-step denitrification pathway during the heterotrophic denitrification, the effects of the intra-membrane aeration pressure and the influent COD/N ratio were further quantitatively evaluated on the systematic performance of nitrogen conversion. Dynamic profiles of key nitrogenous intermediates were investigated to further analyze the treatment efficacy of the targeted biofilm system. It is inapplicable for membrane with oxygen transfer coefficient of 0.3m/d to sustain the biofilm due to the inferior treatment performance under higher influent organics and distinct nitrous oxide (N2O) production with elevated aeration pressures under lower influent organics. For the oxygen transfer coefficients of 7.5m/d and 1.5m/d, N2O production was detectable for the insufficient carbon source, indicating the significance of hydroxylamine oxidization. Short-cut nitrogen removal pathway could be feasible within the latter biofilm due to the nitrite accumulation, further reduced by supplementing the carbon source. Heterotrophic denitrification would contribute to the N2O production. Maintaining the biofilm thickness was conducive to short-cut nitrogen removal by regulating the substrate transfer and the biomass distribution along the biofilm. Besides the total nitrogen removal efficiency, the nitrite accumulation and N2O production were both decreased with the thickening biofilm. Inside the thinner biofilm, a short-cut pathway via nitrite might be the major pathway for nitrogen removal with distinguished N2O production, which could be mitigated through supplementing the carbon source.
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( Hai Long Tian ),( Ying Chun Yan ),( Yuewen Chen ),( Xiao Lei Wu ),( Baoan Li ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.2
The membrane-aerated biofilm reactor (MABR) is a promising municipal wastewater treatment process. In this study, two cross-flow MABRs were constructed to explore the carbon and nitrogen removal performance and bacterial succession, along with changes of influent loading shock comprising flow velocity, COD, and NH4-N concentrations. Redundancy analysis revealed that the function of high flow velocity was mainly embodied in facilitating contaminants diffusion and biosorption rather than the success of overall bacterial populations (p > 0.05). In contrast, the influent NH4-N concentration contributed most to the variance of reactor efficiency and community structure (p < 0.05). Pyrosequencing results showed that Anaerolineae, and Beta- and Alphaproteobacteria were the dominant groups in biofilms for COD and NH4-N removal. Among the identified genera, Nitrosomonas and Nitrospira were the main nitrifiers, and Hyphomicrobium, Hydrogenophaga, and Rhodobacter were the key denitrifiers. Meanwhile, principal component analysis indicated that bacterial shift in MABR was probably the combination of stochastic and deterministic processes.
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Chen Wen,Jing Sicheng,Wang Yu,Pan Jinghua,Li Wei,Bian Baoan,Liao Bin 한국물리학회 2022 Current Applied Physics Vol.43 No.-
Two-dimensional materials have attracted great attention because of their ultra-thin atomic layer thickness and high carrier mobility. In this work, we investigated the electronic transport of in-plane (IP) heterojunction based on Cu/Blue Phosphorus (BlueP), and the results suggest the metallization at the IP Cu/BlueP contact interface and a small Schottky barrier. Then, we investigated the performance of 5.1 nm IP BlueP Schottky barrier field-effect transistors (SBFET) with different dielectrics (SiO2, Al2O3, Y2O3, and La2O3) using quantum transport simulations. The results show that IP BlueP SBFETs with four dielectrics satisfy the off-state requirement of the International Technology Roadmap for Semiconductors (ITRS) for the high-performance (HP) device. However, the on-state current of only IP BlueP SBFET with La2O3 satisfies the requirements of ITRS. This will provide a reference for designing BlueP SBFETs.
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