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Intelligent Charger with Online Battery Diagnosis Function
Van-Tuan Doan,Van-Binh Vu,Hai-Nam Vu,Duc-Hung Tran,Woojin Choi 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In the battery based applications, the performance of the system highly depends on the reliability of the battery. However, it is difficult to obtain the accurate information about the state-of-health (SOH) of battery during its operation. In this paper a 3kw battery charger with online battery diagnosis function which can estimate the SOH of the battery by using online impedance spectroscopy technique is introduced. For the charger, a phase shift full bridge converter with synchronous rectification has been adopted to implement constant current/constant voltage charge and diagnosis functions. The electrochemical impedance spectroscopy (EIS) is performed after the charge to obtain the information about the internal impedance of the battery module, hence the SOH can be estimated online by observing the impedance variation of the battery over time. All the design procedure of the proposed charger is detailed and the feasibility of the system is verified by the experimental results.
Ngoan Thi Nguyen,Dai Lam Tran,Duc Cuong Nguyen,Thai Loc Nguyen,Thi Cham Ba,Binh Hai Nguyen,Thi Duong Ba,Nam Hong Pham,Dzung Tuan Nguyen,Thai Hoa Tran,Gia Dien Pham 한국물리학회 2015 Current Applied Physics Vol.15 No.11
Nanocomposites containing two or more functional constituents are attractive candidates for advanced nanomaterials. In this study, multifunctional Ag/Fe3O4-CS nanocomposites were successfully prepared, using chitosan as a stabilizing and cross-linking agent. The as-synthesized nanocomposites were characterized by Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), UVevisible spectrophotometer (UVeVis) and vibrating sample magnetometer (VSM). The results demonstrated that Ag/Fe3O4-CS composite nanoparticles (NPs) were composed of parent components, Fe3O4 and Ag NPs, which were uniformly dispersed in the chitosan matrix. The hybrid NPs exhibited strong antibacterial property against Pseudomonas aeruginosa. With high magnetization value (67 emu/g), the synthesized Ag/Fe3O4-CS composite can be easily separated or recycled in potential biomedical applications. Furthermore, the results showed that the multicomponent hybrid nanostructures appeared to be the promising material for local hyperthermia, which can be used as thermoseeds for localized hyperthermia treatment of cancers.
Jeong, Seong-Kyu,Hong, In-Ki,Do, Nam-Binh,Tran, Vu Diem Ngoc,Cho, Seong-Youl,Taib, Weon Pil,Lee, Jae-Shin The Korean Powder Metallurgy Institute 2010 한국분말재료학회지 (KPMI) Vol.17 No.5
The effects of $MnO_2$ doping on the crystal structure, ferroelectric, and piezoelectric properties of (K,Na)$NbO_3$ (KNN) ceramics have been investigated. $MnO_2$ was found to be effective in enhancing the densification and grain growth during sintering. X-ray diffraction analysis indicated that Mn ions substituted B-site Nb ions up to 2 mol%, however, further doping induced unwanted secondary phases. In comparison with undoped KNN ceramics, the well developed microstructure and the substitution to B-sites in 2 mol% Mn-doped KNN ceramics resulted in significant improvements in both piezoelectric coupling coefficient and electromechanical quality factor.
Impacts of Loan Support Policy on Farm Income in Vietnam
Thien Ly Dao,Thai-Ha Le,Binh Tran-Nam 중앙대학교 경제연구소 2023 Journal of Economic Development Vol.48 No.2
Assessing the impact of agricultural policies is challenging due to resource limitations and problem identification. This study evaluates the impact of a loan support program on the income of agricultural farms in Vietnam’s crop cultivation and aquaculture sectors. Using the regression discontinuity method and data from Vietnam’s Rural, Agriculture, and Fishery report, encompassing 15,749 farms across 23 provinces in the Central Highlands, Southeast, and Mekong River Delta, we analyze the program’s effects based on farmland holding size. Results indicate a positive impact on annual crops value but a negative impact on income from rice cultivation. Income from perennial crops, such as coffee, showed little increase, while income from pepper cultivation decreased. However, income from aquaculture demonstrated an increase. Overall, the program positively influenced total income with an annual increase of approximately 14.5%. It is evident that the loan support policy is suitable for farm development but may not always yield positive outcomes for specific activities.