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- 저자 : Xiaoyong Ni (검색결과 3 건)
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Xiaoyong Ni,Toshihiro Osaragi,Hong Huang,Ruiqi Li,Anying Chen 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.10
The performance of an urban road-traffic system is affected by many factors, such as the average traffic demand, and the network structure, etc. At the same time, natural disasters, abnormal traffic volume and man-made accidents can result in disturbances which also influence the performance of the system. Resilience of an urban road-traffic system has been an emerging research field. This paper proposes a resilience-oriented performance assessment method based on a traffic flow assignment model to precisely capture the performance of an urban road-traffic system. System functionality is chosen as the key proxy for resilience, which can be calculated based on some index parameters including allocation rate of traffic flow, commuting efficiency on road sections, etc. A case study is implemented in a downtown area in Beijing, China. As to the resilience of the system when faced with huge traffic volume, the results show that the road-traffic system itself has a certain degree of absorption capacity for traffic pressure induced by huge volume. As to the resilience of the system when faced with local network failure, the results show that information dissemination of the network condition and the traffic volume are the key impact factors on system’s resilience curves.
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Construction of Phenol/O2 Fuel Cell with CuO/MWCNTs Modified Electrode as Anode
Shuhui Liu,Yuan Wu,Yonglei Xing,Yan Hai,Juan Peng,Gang Ni,Xiaoyong Jin 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.10
Traditional biofuel cells (BFCs) are devices that use biological catalysts to catalyze the oxidation of organic materials and in the meantime convert chemical energy into electrical energy. In this work, a nonenzymatic catalyst that integrated copper oxide with multi-walled carbon nanotubes (CuO/MWCNTs) was synthesized by a simple solvothermal method, and the composites show an outstanding electrocatalytic activity for oxidation of phenol due to the synergistical contribution of CuO nanoparticles and MWCNTs. The effects of the pH, concentration of electrolyte and phenol and scan rate on the phenol oxidation are investigated. Benefitting from the excellent performance toward phenol oxidation, a H-type phenol fuel cell was fabricated with CuO/MWCNTs as anode material and electro-deposited platinum film as cathode material. The results show that the phenol fuel cell has an open-circuit potential (OCP) of 0.69 V and can produce a maximum power density of 0.25 mW · cm -2 at 0.44 V with 500 mg · L -1 phenol and 0.1 mol · L -1 PBS. The stability test revealed that the fuel cell could still deliver about 0.24 mW · cm -2 after repeating the test for five times, indicating that the fuel cell has good stability.
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magnetostratigraphy, 26Al-10Be, Yx02 borehole, tectonic evolution, Daxing Uplift, Beijing Sub-plain
Fubing He,Xiwei Xu,Fang Tian,Zhenhua Liu,Yueze Zhang,Lingyan Bai,Yubin Cui,Kai Wang,Wenzhi Niu,Jingbo Ni,Xiaoyong Liu,Mengmeng Cao 한국지질과학협의회 2024 Geosciences Journal Vol.28 No.2
The buried Daxing Uplift connects the Beijing Sag and Dachang Sag, which is the critical tectonic unit for understanding the structural evolution of the Beijing Sub-plain and its linkages to regional tectonics. This study combines paleomagnetic, 26Al-10Be isochron dates and sedimentary analyses from a new borehole (Yx02) in the northeastern Beijing Sub-plain to shed fresh light on regional tectonic processes and the sedimentary history since the Pliocene. The main findings are as follows: (1) the Daxing Uplift had formed three depositional episodes: alluvial-fan, lacustrine-delta, and alluvial-fan sedimentation since the Cenozoic; (2) The borehole records the Brunhes, Gauss normal chron, and the Matuyama, Gilbert reversed chron in the Daxing Uplift, the corresponding depths are 0–148.9 m, 148.9–315.0 m, 315.0–520.5 m and 520.5–650 m; (3) An important tectonic event started in ~4.3 Ma, disintegrated NE-trending basin and range terrain, reactivated the NW-trending Nankou-Sunhe fault, and formed Shunyi fault in Beijing Sub-plain. Sedimentation occurs exclusively in the Beijing Sag and the northeastern Daxing Uplift during ~4.3–1.77 Ma; (4) During ~1.77–1.07 Ma, a transition from an extension to a strike-slip occurred, and is described not only in a progressively higher increase of the overall deposition rate, but also in a decrease of the relative deposition disparity between sags and uplifts. Since then, the Beijing Sub-plain has been shaped, associated with an overall subsidence depression in the Bohai Bay Basin. This work enhances our understanding of the formation and evolution of the Beijing Sub-plain, the division of tectonic episodes, and the initiation time of the latest tectonic movement in the break-up region, North China Craton, since the Neogene.
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