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| 1 | Engineering porosity into trimetallic PtPdNi nanospheres for enhanced electrocatalytic oxygen reduction activity显示文摘Platinum(Pt)-based multi-metallic nanostructures show great promise as electrocatalysts for the oxygen reduction reaction(ORR) in fuel cell cathodes. Herein, we report a simple, one-step surfactant-directed synthetic strategy to directly synthesize tri-metallic PtPdNi mesoporous nanospheres(PtPdNi MNs) in a high yield. The synthesis could be accomplished in aqueous solution at mild reaction temperature(40C)without needing any organic solvent, yielding well-dispersed PtPdNi MNs with uniform shape and narrow size distribution. Benefitting from their unique mesoporous and highly open structure and tri-metallic composition, the as-synthesized PtPdNi MNs demonstrate superior catalytic activity and stability for ORR in acidic solution in comparison with PtPdNi nanodendrites(PtPdNi NDs), PtPd MNs and commercial Pt/C catalyst. The present approach may open a reliable path to the design of advanced electrocatalysts with desired performance. | Chunjie Li You Xu Yinghao Li Hongjie Yu Shuli Yin Hairong Xue Xiaonian Li Hongjing Wang Liang Wang | 2018 | Green Energy & Environment2018，3，4： | 1 |
| 2 | An alternative approach for computing seismic response with accidental eccentricity显示文摘Accidental eccentricity is a non-standard assumption for seismic design of tall buildings. Taking it into consideration requires reanalysis of seismic resistance, which requires either time consuming computation of natural vibration of eccentric structures or finding a static displacement solution by applying an approximated equivalent torsional moment for each eccentric case. This study proposes an alternative modal response spectrum analysis(MRSA) approach to calculate seismic responses with accidental eccentricity. The proposed approach, called the Rayleigh Ritz Projection-MRSA(RRP-MRSA), is developed based on MRSA and two strategies:(a) a RRP method to obtain a fast calculation of approximate modes of eccentric structures; and(b) an approach to assemble mass matrices of eccentric structures. The efficiency of RRP-MRSA is tested via engineering examples and compared with the standard MRSA(ST-MRSA) and one approximate method, i.e., the equivalent torsional moment hybrid MRSA(ETM-MRSA). Numerical results show that RRP-MRSA not only achieves almost the same precision as ST-MRSA, and is much better than ETM-MRSA, but is also more economical. Thus, RRP-MRSA can be in place of current accidental eccentricity computations in seismic design. | Fan Xuanhua Yin Jiacong Sun Shuli Chen Pu | 2014 | Earthquake Engineering and Engineering Vibration2014，13，3： | 0 |
| 3 | RF and field measurements of the SSC-LINAC RFQ显示文摘The 53.667 MHz continuous-wave heavy ion RFQ has been designed and manufactured for the SSC-LINAC project.This four-rod RFQ accelerates ions with maximum mass to charge ratio of 7 from 3.728 keV/u to 143 keV/u.Measurements have been carried out to check the RF performance of the cavity and the quality of the electric field.The S11 of the power coupler is adjusted to better than-44 dB,and the Q0 of the cavity is 6440.The quality of the electric field is evaluated by the perturbation method.The measurement procedure and data analysis will be discussed in detail.The error due to gravity of the perturbation bead has been corrected by averaging the fields in different quadrants.As a result,the unflatness of the electric field is±2.5%,and the dipole field component distributes from 0%to 20%in different longitudinal positions,which indicates the asymmetry of the quadrupole field.The unflatness of the quadrupole field distribution represents a good agreement with the simulation results.High power RF test and beam commissioning of the RFQ are on schedule in early 2014. | LIU Ge LU YuanRong YIN XueJun ZHANG XiaoHu DU Heng JIANG PeiYong LI ZhongShan LI XiaoNi HE Yuan WANG Zhi GAO ShuLi YANG YaQing ZHU Kun YAN XueQing CHEN JiaEr YUAN YouJin XIA JiaWen ZHAO HongWei | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，7： | 0 |
| 4 | An improved master-apprentice evolutionary algorithm for minimum independent dominating set problem显示文摘The minimum independent dominance set(MIDS)problem is an important version of the dominating set with some other applications.In this work,we present an improved master-apprentice evolutionary algorithm for solving the MIDS problem based on a path-breaking strategy called MAE-PB.The proposed MAE-PB algorithm combines a construction function for the initial solution generation and candidate solution restarting.It is a multiple neighborhood-based local search algorithm that improves the quality of the solution using a path-breaking strategy for solution recombination based on master and apprentice solutions and a perturbation strategy for disturbing the solution when the algorithm cannot improve the solution quality within a certain number of steps.We show the competitiveness of the MAE-PB algorithm by presenting the computational results on classical benchmarks from the literature and a suite of massive graphs from real-world applications.The results show that the MAE-PB algorithm achieves high performance.In particular,for the classical benchmarks,the MAE-PB algorithm obtains the best-known results for seven instances,whereas for several massive graphs,it improves the best-known results for 62 instances.We investigate the proposed key ingredients to determine their impact on the performance of the proposed algorithm. | Shiwei PAN Yiming MA Yiyuan WANG Zhiguo ZHOU Jinchao JI Minghao YIN Shuli HU | 2023 | Frontiers of Computer Science2023，17，4： | 0 |
| 5 | 6-2 Recent Progress of the SSC-Linac显示文摘SSC-Linac[1] as the injector for the Separated Sector Cyclotron (SSC), is being constructed at national labo-ratory Heavy Ion Research Facility at Lanzhou (HIRFL). The injection and extraction energy are 3.7 keV/u and1.025 MeV/u, respectively. Fig. 1 shows the front end section of the SSC-Linac. The high charges state continuswave (CW) 4-rod RFQ has been designed and fabricated for some years. From the end of 2013, the commissioningof the RFQ was performed and the beam test was carried out in April 2014. In this paper the experiment resultwill be presented. | Yin Xuejun Yuan Youjin Zhang Xiaohu Lu Wang Du Heng Li Xiaoni Jiang Peiyong Li Zhongcan Wang Haonin Yang Yaqing Ma Lizhen Xu Zhe Zhang Xuezhen Sun Liangting Yao Qinggao Meng Jun Cai Guozhu He Yuan Zhao Hongwei Xia Jiawen Liu Ge Lu Yuanrong Zhu Kun Gao Shuli Yan Xueqing Chen Jiaer | 2014 | IMP & HIRFL Annual Report2014，，1： | 0 |
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