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Key Technologies of Supercapacitor Energy Storage System of IP Transmitter
Zhihui Zeng,Xiaowei Wang,Yanfang Wei,Zhiguo Hu,Yangxiao Yu,Zhigang Zhang 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
A practical application of a supercapacitor energy storage system in a polarization instrument is proposed on the basis of theenergy storage requirements of an induced polarization (IP) transmitter for geophysical exploration. We focused on the energystorage system of a supercapacitor, the topology of the power converter, and the system control strategy as key technologies, andwe performed theoretical research and experimental tests on the system and developed an experimental platform. Theexperiments validated the theoretical research on the key technologies of the supercapacitor energy storage system anddemonstrated the effectiveness of the innovation. Results showed that the storage system is efficient and satisfies the energystorage needs of the IP transmitter.
Study on Calcium Phosphate Cement for Bone Reconstruction
Liming, Hu,Changsheng, Liu,Wei, Shen,Yanfang, Gu 한국재료학회 1995 Fabrication and Characterization of Advanced Mater Vol.1 No.2
In this paper the prepartation of calcium phosphate salts, the setting technology, the mechanism of hydration and hardening and the biocompatibility of CPC are studied systematically. The results show that using ultrafine HAP and CaCo$_{3}$ as starting materials can greatly shorten the reaction time for the prepartation of pure TECP(only 9 hour needed) : the existence of HAP seed may cut down the setting time, bu lower the compressive strength ; the proper powder-to-liquid ratio is 4 : 1 ; the rate of hydration is comparatively rapid initially, controlled by dissolution of the reactants surfaces, however, eventually becomes diffusion nally controlled ; during the hydration and hardening process of CPC, the paste changes from viscoplasticity to viscoelasticity and to elasticity ; the initial structure is net-work fromed by Van der Waals' forces, which gradually strengthens, eventually connected by chemical bondings. The final product of CPC is acicular HAP, which has high biocompatibility including no toxicity, no carcinogenicity, no mutagenicity and no deformity. When CPC is implanted, it is highly compatible with soft tissue, and close connection between CPC and adjacent bone will occur one month later.
Key Technologies of Supercapacitor Energy Storage System of IP Transmitter
Zeng, Zhihui,Wang, Xiaowei,Wei, Yanfang,Hu, Zhiguo,Yu, Yangxiao,Zhang, Zhigang The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
A practical application of a supercapacitor energy storage system in a polarization instrument is proposed on the basis of the energy storage requirements of an induced polarization (IP) transmitter for geophysical exploration. We focused on the energy storage system of a supercapacitor, the topology of the power converter, and the system control strategy as key technologies, and we performed theoretical research and experimental tests on the system and developed an experimental platform. The experiments validated the theoretical research on the key technologies of the supercapacitor energy storage system and demonstrated the effectiveness of the innovation. Results showed that the storage system is efficient and satisfies the energy storage needs of the IP transmitter.
Weijun Peng,Huilan Chen,Wei Wang,Yanfang Huang,Guihong Han 한국물리학회 2020 Current Applied Physics Vol.20 No.2
The NiCo2S4 nanospheres arrayed on the surface of reduced graphene oxide (rGO) was fabricated via one-step hydrothermal method. The effect of initial feeding mass of Ni(NO3)2·6H2O and Co(NO3)2·6H2O to rGO on the microstructure and electrochemical performance of the as-prepared composites was studied. The results indicated that the specific capacitances of the composites were first increased and then reduced due to the aggregation of NiCo2S4 nanospheres. NiCo2S4 nanospheres/rGO composites exhibited a remarkable specific capacitance of 1406 F/g and excellent cyclic stability of 82.36% at the current density of 1 A/g, which were better than those of individual NiCo2S4 (792 F/g and 64.77%) counterpart. These results showed that the as-prepared NiCo2S4 nanospheres/rGO composites were outstanding candidate for electrode material of supercapacitors
Yuanmei Chen,Yutang Xiao,Guanping Wang,Wei Shi,Linquan Sun,Yanfang Chen,Aichun Miao 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.4
In this pilot-scale test, the ozonation-biological treatment-catalytic ozonation system was performed to treat complex organics and highly-concentrated total nitrogen (TN) in biological pretreated incineration leachate. The test results showed that the ratio of five-day biochemical oxygen demand (BOD5) / chemical oxygen demand (COD) increased from 0.059 to 0.237, which indicated that the concentration of biodegradable COD (CODbio) increased by ozonation pre-treatment process. In addition, the TN removal mainly occurred in anaerobic zone due to direct denitrification by the activated bacteria, which were domesticated through different influent ratio. Moreover, it was necessary to add catalytic ozonation process to reach higher direct effluent discharge criteria. After 60 days repeated debugging, the removal rate of COD and TN reached 88.5% and 98.2%, respectively. Finally, the total cost of this system was ¥ 6.65 /㎥ ($ 0.95 /㎥), which was acceptable for the treatment of biological pretreated leachate. This pilot-scale test could provide some guiding information for the treatment of leachate containing highly-concentrated TN with low CODbio/N by the composite system.
Ming Zhao,Ming Zhao,Bin Tong,Zinan Kang,Yanfang Wu,Wei Ding,Baoming Feng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.5
The synthesis of PdP nanoparticles (NPs) using triphenylphosphine as a phosphorus precursor was investigated. The electrocatalytic performance of PdP NPs in hydrogen evolution reaction in an alkaline medium was measured. It can be concluded that when the current density is 10 mA cm -2, the overpotential produced by Pd3P0.95 NPs is 75mV which is 185mV lower than that produced by commercial Pd/C. The mass activity of Pd3P0.95 NPs is more than twice as high as that of commercial Pd/C. The work indicates that PdP nanomaterials could be a potential catalyst for water splitting.
Sun Yanzhou,Han Wu,Liu Xiaoqian,Song Xiaoyan,Wei Yanfang 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.2
In order to solve the problem of limited frequency selection range and simplify calculations on the grounded capacitance measurement for the ungrounded distribution system, a high-frequency injecting method for the capacitive current measurement is proposed in the paper. The injecting frequency can be high enough to ignore capacitive reactance and leakage resistance comparing with leakage inductance. The leakage inductance value is obtained directly on the base of simplifi ed calculation. Then the resonant frequency of the power system needs to be obtained by the traditional resonant method. Finally, the grounded capacitance can be calculated through the equivalent circuit and the simultaneous equations. The simulation and experiments verify the feasibility of the high-frequency method. The experiment results prove that this method not only solves the problem of frequency selection, but also has advantages of convenience and high precision (the relative error is less than 5%), which is also suitable for the larger grounded capacitance system.