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Xuejun, Cao,Jianhang, Zhu,Dongzhi, Wei,Hur, Byong Ki 한국공업화학회 2002 Journal of Industrial and Engineering Chemistry Vol.8 No.3
Partition behavior of cephalexin and 7-ADCA in PEG-salts and EOPO-salts aqueous two-phase systems has been investigated under various different conditions. Effect of polymer molecular weight, salts types, tie line length on partition coefficients of cephalexin and 7-ADCA were described. Additives such as salts, water miscible solvents and surfactants were used to improve partition of cephalexin and 7-ADCA. NaSCN shows greatest influence on partition of cephalexin and 7-ADCA in 20% PEG 400-17.5% (NH_4)_2SO_4. Cephalexin and 7-ADCA partition coefficients reached 12.92 and 2.58, respectively. While NaCI shows greatest influence on partition of cephalexin and 7-ADCA in E0_40PO_60-(NH_4)_2SO_4. In 15% E0_40P0_60-13% (NH_4)_2SO_4 ATPS, partition coefficients of cephalexin and 7-ADCA reached 0.08 and 0.42, respectively. Cephalexin and 7-ADCA shows different partition trend in PEG-(NH_4)_2SO_4 and EOPO-(NH_4)_2SO_4 ATPS. In EOPO-(NH_4)_2SO_4 ATPS, diagrams of PEG3000-(NH_4)_2SO_4, E0_40PO_60-(NH_4)_2SO_4, E0_20PO_80-(NH_4)_2SO_4 were prepared and their differences were analyzed, and recovery of E0_40PO_60-(NH_4)_2SO_4 ATPS was performed with yield of 90-95%.
Xiufang Zhu,Qin Zhong,Han Yan,Xuejun Zhao,Wenyi Tan 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.8
Perovskite-type Ce_(0.9)Sr_(0.1)Cr_(0.5)Mn_(0.5)O_(3-δ) (CSCMn) was synthesized and evaluated as anode for solid oxygen fuel cells based on Ce_(0.8)Sm_(0.2)O_(1.9) (SDC). The conductivities of CSCMn were evaluated with DC four-probe method in 3% H_2-N_2 and 5% H_2S-N_2 at 450-700 ℃, respectively. The compositions of CSCMn powders were studied by XRD and thermodynamic calculations. Meanwhile, sintering temperatures affecting phases of CSCMn is also proposed with XRD, and the analysis is given with thermodynamic calculations. CSCMn exhibits good chemical compatibility with electrolyte (SDC) in N_2. After exposure to 5% H_2S-N_2 for 5 h at 800 ℃, CSCMn crystal structures change and some sulfides are detected, as evidenced by XRD and Raman analyses. The electrochemical properties are measured for the cell comprising CSCMn- SDC/SDC/Ag in 5% H_2S-N_2 at 600 ℃ and in 3% H_2-N_2 at 450 and 500 ℃. The electrochemical impedance spectrum (EIS) is used to analyze ohm and polarization resistance of the cell at various temperatures.
Power Sharing Strategy of A Series-parallel-connected EV Charger
Guozhen Hu,Huang Lei,Xuejun Ma,Guorong Zhu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In order to meet different requirements of rechargeable batteries in Electric vehicles, a charger with hybrid structure, which designed as module and combined in series and parallel, was proposed in this paper. Each individual module uses ZCS phase-shifted full-bridge converters. And in order to ensure power sharing of each module, the outer loop power control strategy based on average current sharing method has been adopted. A combination prototype was built following the proposed strategy. Experimental results verify the correctness of the proposed scheme and the performance of power sharing system can meet the charging application.
대학교 기숙사 생활 만족도에 영향을 미치는 요인: G대학 외국인 학생을 중심으로
최준혁,장영,정화흠,주설군,Choi, Jun Hyuk,ZHANG, YING,ZHENG, HUAXIN,ZHU, XUEJUN 서비스사이언스학회 2012 서비스연구 Vol.2 No.2
많은 대학에서 해외 유학생을 유치하기 위해 노력하고 있다. 우리나라의 외국 유학 중에는 지리적으로 가까운 중국학생이 가장 많은 상황이며, 향후에도 지속적으로 증가할 가능성이 있기 때문에 이를 충족시켜 줄 수 있는 다양한 서비스 제공이 필요한 시점이다. 본 연구는 대학 기숙사를 대상으로 하여, 소음요인, 음식요인 및 시설요인이 유학생들의 기숙사 생활만족도에 어떠한 영향을 주는지에 알아보기 위하여, G대학교 중국유학생을 대상으로 실증 연구를 수행하였다. 분석 결과 음식요인과 시설요인은 기숙사 생활 만족도에 유의한(+) 영향을 미치는 것으로 나타났으며, 소음요인은 유의한 영향을 미치지 않은 것으로 나타났다. 연구 결과를 토대로 외국 유학생을 유치하는 대학에서는, 기숙사에 대한 차별화 전략을 사용할 경우 시설 및 음식 요인에 초점을 맞추는 것이 좀 더 효과적이라고 판단된다. Government and many universities have been trying to get the more international students. Foreign students in university are increasing remarkably in Korea. So these authorities have to consider their service competency for new foreign student's living satisfaction. In this paper, we described about the living satisfaction degree on the university dormitory's service in Korea. After reviewing and summarizing the related literatures, our hypotheses are established which the satisfaction be affected by some service factors such as facility, foods, and noise factors in university dormitory's environments. The 99 Chinese students living in G-university dormitory responded to our study. Empirical analysis was performed among a university in Sungnam city named as G-university by using questionnaires sheets. Analysis results are show that satisfaction degree on the university dormitory's service is affected significantly by facility and foods service factors respectively. However noise factor was not the significant variable.
Study on liquid-solid jet erosion characteristics of 316L stainless steel
Guan Wang,Qianfeng Gao,Linyuan Kou,Pei Zhang,Wenhui Wang,Jianfei Deng,Xuejun Zhu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
The essence of erosion is the dynamic damage and material loss process of a material caused by particle impact. The failure mechanism of erosion is the result of the interaction of multiphase flow, particle characteristics, material properties, particle impact process, and other factors. This paper employs experimental and numerical simulation methods to investigate the erosion behavior of a solid-liquid two-phase flow of 316L stainless steel jet from the angle of erosion, to explain the erosion behavior from both macroscopic and microscopic perspectives. The results discovered that the kinetic energy of the fluid is converted into pressure potential energy, which changes the kinematic characteristics of the particles and influences how they erode. The particles erode the target material by plowing and impacting at various erosion angles, and the erosion rate exhibits an increasing-decreasing-increasing tendency as the erosion angle increases, the 45° corresponds to the maximum erosion rate. Due to the particles to harden the target surface, the erosion effect is diminished in the time dimension. Comparing to high erosion angles, the reduction rate of the erosion rate in the late experiment stage is small for slow erosion angles. In the last 3 hours of the experiment, the total erosion of 316L stainless steel at 90° erosion angle was only 35 %. This provides a theoretical foundation for failure prevention in transport components containing solid particles.