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- 저자 : Zhiliang Yang (검색결과 5 건)
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Zhiliang Yang,Weisheng Du,Cun Zhang,Binjie Ma 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
Sandy mudstones of various sedimentary ages are deposited in the Dongsheng Coalfield in China. Studying the tensile mechanical properties of these sandy mudstones would provide a reference for underground construction in this area. Four sets of sandy mudstones with different sedimentary ages from Dongsheng Coalfield in China were selected as the research objects. First, the mineral composition and microstructure of the 4 sets of Brazilian disc specimens were obtained by X-ray diffraction and scanning electron microscope. With the increase of sedimentary age, the microstructure of sandy mudstone becomes denser. Then the deformation and acoustic emission (AE) characteristics of the specimens during the Brazilian tests were observed. The indirect tensile strength, peak strain, total strain and pre-peak energy accumulation of sandy mudstones showed an approximate increasing trend with sedimentary age increasing. AE hit rate of the specimens with longer sedimentary age was higher, and the AE signals of these specimens with longer sedimentary age were released more severely after the peak tensile strength. The influence of sedimentary age on the properties of sandy mudstones was discussed from three aspects: the main mineral components, the geostress environment of sandy mudstone, microscopic morphology and granular structure.
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Yue Zhang,Zhiliang Zhang,Gang Yang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Boundary Conduction Mode (BCM) and Discontinuous Conduction Mode (DCM) control strategies are widely used for the photovoltaic micro-inverter. For the interleaved flyback micro-inverter, BCM and DCM control strategies are investigated concentrating on the loss analysis under different load condition. The dominant losses with heavy load include the conduction loss of the MOSFETs and diodes, and the core loss and copper loss of the transformer, while the dominant losses with light load include the driving loss, turn-off loss of the MOSFETs and the transformer core loss. Based on the loss analysis, a new Multi-mode control strategy combing the two-phase DCM, one-phase DCM and phase skipping mode control is proposed to improve the efficiency in wide load range without increasing the cost or complexity of the design by reducing the dominant losses depending on the load current. A distributed system prototype with two micro-inverters in parallel has been built and tested. The experimental results verified the effectiveness of the proposed method.
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Baboo, Joseph Paul,Song, Jinju,Kim, Sungjin,Jo, Jeonggeun,Baek, Sora,Mathew, Vinod,Pham, Duong Tung,Alfaruqi, Muhammad Hilmy,Xiu, Zhiliang,Sun, Yang-Kook,Kim, Jaekook American Chemical Society 2017 Chemistry of materials Vol.29 No.16
<P>Monoclinic Li3V2(PO4)(3) (LVP) has been considered a promising cathode material for lithium-ion batteries for the past decade because of its high average potential (>4.0 V) and specific capacity (197 mAh g(-1)). In this paper, we report a new monoclinic-orthorhombic Na1.1Li2.0V2(PO4)(3)/C (NLVP/C) composite cathode synthesized from monoclinic LVP via a soft ion-exchange reaction for use in Na+/Li+ hybrid-ion batteries. High-resolution synchrotron X-ray diffraction (XRD), thermal studies, and electrochemical data confirm room temperature stabilization of the monoclinic-orthorhombic NLVP/C composite phase. Specifically, we report the application of a monoclinic-orthorhombic NLVP/C composite as cathode material in a Na half-cell. The cathode delivered initial discharge capacities of 115 and 145 mAh g(-1) at a current density of 7.14 mA g(-1) in the 2.5-4 and 2.5-4.6 V vs Na/Na+ potential windows, respectively. In the lower potential window (2.5-4 V), the composite electrode demonstrated a two-step voltage plateau during the insertion and extraction of Na+/Li+ ions. Corresponding in situ synchrotron XRD patterns recorded during initial electrochemical cycling clearly indicate a series of two-phase transitions and confirm the structural stability of the NLVP/C composite cathode during insertion and extraction of the hybrid ions. Under extended cycling, excessive storage of Na ions resulted in the gradual transformation to the orthorhombic NLVP/C symmetry due to the occupancy of Na ions in the available orthorhombic sites. Moreover, the estimated average working potential and energy density at the initial cycle for the monoclinic-orthorhombic NLVP/C composite cathode (3.47 V vs Na/Na+ and 102.5 Wh kg(-1), respectively) are higher than those of the pyro-synthesized rhombohedral Na3V2(PO4)(3) (3.36 V vs Na/Na+ and 88.5 Wh kg(-1)) cathode. Further, the cathode performance of the composite material was significantly higher than that observed with pure monoclinic LVP under the same electrochemical measurement conditions. The present study thus showcases the feasibility of using a soft ion-exchange reaction at 150 degrees C to facilitate the formation of composite phases suitable for rechargeable hybrid-ion battery applications.</P>
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Alfaruqi, Muhammad H.,Mathew, Vinod,Song, Jinju,Kim, Sungjin,Islam, Saiful,Pham, Duong Tung,Jo, Jeonggeun,Kim, Seokhun,Baboo, Joseph Paul,Xiu, Zhiliang,Lee, Kug-Seung,Sun, Yang-Kook,Kim, Jaekook American Chemical Society 2017 Chemistry of materials Vol.29 No.4
<P>Rechargeable zinc-ion batteries (ZIBs) with high energy densities appear promising to meet the increasing demand for safe and sustainable energy storage devices. 1.5 However, electrode research on this low-cost and green system are faced with stiff challenges of identifying materials that permit divalent ion-intercalation/deintercalation. Herein, we present layered-type LiV3O8 (LVO) as a prospective intercalation cathode for zinc-ion batteries (ZIBs) with high storage capacities. The detailed phase evolution study during Zn intercalation using electrochemistry, in situ XRD, and simulation techniques reveals the large presence of a single-phase domain that proceeds via a stoichiometric ZnLiV3O8 phase to reversible solid-solution ZnyLiV3O8 (y > 1) phase. The unique behavior, which is different from the reaction with lithium, contributes to high specific capacities of 172 mAh g(-1) and amounts to 75% retention of the maximum capacity achieved in 65 cycles with 100% Coulombic efficiency at a current density of 133 mA g(-1). The remarkable performance makes the development of this low-cost and safe battery technology very promising, and this study also offers opportunities to enhance the understanding on electrochemically induced metastable phases for energy storage applications.</P>
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