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RISS 인기검색어
- 검색키워드
- 저자 : Xiaobei Wu (검색결과 4 건)
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Recent Advances of 2D Nanomaterials in the electrode materials of Lithium-Ion Batteries
Xiaobei Zang,Teng Wang,Zhiyuan Han,Lingtong Li,Xin Wu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.2
The upcoming energy crisis and the increasing power requirements of electronic devices have drawn enormous attention to research in the field of energy storage. Owing to compelling electrochemical and mechanical properties, two-dimensional nanomaterials can be used as electrodes on lithium-ion batteries to obtain high capacity and long cycle life. This review summarized the recent advances in the application of 2D nanomaterials on the electrode materials of lithium-ion batteries.
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Distributed Prevention Mechanism for Network Partitioning in Wireless Sensor Networks
Lili Wang,Xiaobei Wu 한국통신학회 2014 Journal of communications and networks Vol.16 No.6
Connectivity is a crucial quality of service measure inwireless sensor networks. However, the network is always at riskof being split into several disconnected components owing to thesensor failures caused by various factors. To handle the connectivityproblem, this paper introduces an in-advance mechanism toprevent network partitioning in the initial deployment phase. Theapproach is implemented in a distributed manner, and every nodeonly needs to know local information of its 1-hop neighbors, whichmakes the approach scalable to large networks. The goal of the proposedmechanism is twofold. First, critical nodes are locally detectedby the critical node detection (CND) algorithm based on theconcept of maximal simplicial complex, and backups are arrangedto tolerate their failures. Second, under a greedy rule, topologicalholes within the maximal simplicial complex as another potentialrisk to the network connectivity are patched step by step. Finally,we demonstrate the effectiveness of the proposed algorithmthrough simulation experiments.
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Enhanced Curdlan Production in Agrobacterium sp. ATCC 31749 by Addition of Low-polyphosphates
Lijun Yu,Jianrong Wu,Jia Liu,Xiaobei Zhan,Zhiyong Zheng,Chi Chung Lin 한국생물공학회 2011 Biotechnology and Bioprocess Engineering Vol.16 No.1
A large amount of adenosine triphosphate with high energy phosphate bonds is required for uridine triphosphate regeneration during curdlan biosynthesis by Agrobacterium sp. ATCC 31749. To supply high energy for curdlan synthesis, three low-polyphosphates (Na_4P_2O_7,Na_5P_3O_10, and (NaPO_3)_6) with higher energy phosphate bonds were employed to substitute for KH_2PO_4-K_2HPO_4in fermentation medium. Two genes encoding the polyphosphate metabolizing enzymes, polyphosphate kinase and exopolyphosphatase, were amplified and showed 95%homology to those in Agrobacterium sp. C58 by sequence analysis. The curdlan yields were enhanced by 23 and 134% when phosphate concentrations 0.024 mol/L of Na_5P_3O_10 and 0.048 mol/L of (NaPO_3)_6 respectively, were added in the medium. The maximum curdlan yield of 30 ±1.02 g/L was obtained with the addition of 0.048 mol/L of (NaPO_3)_6 with 5 g/L CaCO_3 in the medium. When CaCO_3 was removed from the culture and the three lowpolyphosphates were added, the pH and biomass yield dropped remarkably and little or no curdlan was produced. The culture containing 0.048 mol/L of (NaPO_3)_6 was mixed with KH_2PO_4-K_2HPO_4 and CaCO_3 in the medium,but showed no effect on curdlan production. However,curdlan yield was improved by 49 ~ 60% when CaCO_3was removed from the medium and KH_2PO_4-K_2HPO_4acted as a buffer. It appears that the positive effect of (NaPO_3)_6 on curdlan production required the buffering capacity of CaCO_3 and the absence of KH_2PO_4-K_2HPO_4competing as a phosphate supplier.
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Minjie Gao,Zhongping Shi,Shijuan Dong,Ruisong Yu,Jianrong Wu,Zhiyong Zheng,Xiaobei Zhan 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.6
The performance of traditional heterologous protein production by Pichia pastoris with methanol induction at 30 ℃ is poor, characterized by low ATP regeneration rate and weak operation stability. A low temperature induction strategy at 20 ℃ was thus adopted for efficient porcine interferon-α production in a 10 L fermentor. With the strategy,maximal methanol tolerance level could reach about 40 g/L to effectively deal with methanol concentration variations,so that the complicated on-line methanol measurement system could be eliminated. Moreover, metabolic analysis based on multiple state-variables measurements indicated that pIFN-α antiviral activity enhancement profited from the formation of an efficient ATP regeneration system at 20℃ induction. Compared to the induction strategy at 30 ℃, the proposed strategy increased the ATP regeneration rate by 49-66%, the maximal p_IFN-α antiviral activity was enhanced about 20-fold and reached a higher level of 1.5×10^6 IU/mL.
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