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Chen‑Song Wang,Ni Suo,Hao Huang,Ai‑min Wu,Guo‑Zhong Cao,Gui‑Feng Zhang 한국탄소학회 2019 Carbon Letters Vol.29 No.5
Boron-doped amorphous carbon (BDAC) thin films with a regular oxygen reduction reaction (ORR) catalytic activity were synthesized in a hot filament chemical vapor deposition device using a mixture of CH4 and H2 as a gas source and B2O3 as a boron source and then oxidized in air at 380–470 °C for 15–75 min. Scanning electron microscope, transmission electron microscope, Raman spectroscopy, X-ray photoelectron spectroscopy, and electrochemical tests were used to characterize the physical and electrochemical properties of the BDAC catalysts. It was concluded that the BDAC catalyst oxidized at 450 °C for 45 min showed the best ORR catalytic activity in alkaline medium. The oxygen reduction potential and the transfer electron number n, respectively, are − 0.286 V versus Ag/AgCl and 3.24 from the rotating disk electrode experiments. The treated carbon film has better methanol resistance and stability than the commercial Pt/C catalyst.
Wang Chen-Song,Suo Ni,Huang Hao,Wu Ai-min,Cao Guo-Zhong,Zhang Gui-Feng 한국탄소학회 2019 Carbon Letters Vol.29 No.5
Boron-doped amorphous carbon (BDAC) thin films with a regular oxygen reduction reaction (ORR) catalytic activity were synthesized in a hot filament chemical vapor deposition device using a mixture of CH4 and H2 as a gas source and B2O3 as a boron source and then oxidized in air at 380–470 °C for 15–75 min. Scanning electron microscope, transmission electron microscope, Raman spectroscopy, X-ray photoelectron spectroscopy, and electrochemical tests were used to characterize the physical and electrochemical properties of the BDAC catalysts. It was concluded that the BDAC catalyst oxidized at 450 °C for 45 min showed the best ORR catalytic activity in alkaline medium. The oxygen reduction potential and the transfer electron number n, respectively, are − 0.286 V versus Ag/AgCl and 3.24 from the rotating disk electrode experiments. The treated carbon film has better methanol resistance and stability than the commercial Pt/C catalyst.
Ai-min Ren,Yu Zhang,Weiwei Yu,Kai Zhao,Zhiru Hu,Zhiquan Zhang,Guodong Feng,Zhi-Guang Song 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-
In this article, a series of coumarin derivativefluorescent probes have been synthesized, which can realizesimple, rapid and sensitive detection of Pd2+. We tested thefluorescence properties of threefluorescentprobes, (E)-N0-(((4-chloropyridin-2-yl) methylene)-7-(diethylamino)-2-oxo-2H-chromene-3-carbohy(CMDCC) has the betterfluorescence properties and anti-interference ability. Then, CMDCC as thefluorescence probe for detection of Pd2+ was systematic studied. Under optimized conditions, this probehas a wide pH range, a lower detection limit (4.4510 8 mol L-1), and a faster response speed (3 min). Inthe Pd2+ concentration range of 0.1 5 mmol L-1, thefluorescence intensity of this probe and concentrationof Pd2+ show a good linear response. In this work, Pd2+ content in organic waste liquid was successfullydetected and a standard addition test was also performed. The satisfactory recovery rate was obtained. Moreover, it can be observed with naked eyes that the palladium ion changes the solution color of CMDCCfrom green to red. This color change can easily be compared with other metal salts. It indicates thatCMDCC can also detect Pd2+ by colorimetric method. Therefore, CMDCC should be used to rapidly,conveniently detect Pd2+ in environmental samples.
Relation between Quantum Entanglement and the Berry Phase in Systems of Two Interacting Qubits
Ai Min Chen,Yao Heng Su,Sam Young Cho 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.4
Quantum entanglement and the Berry phase are investigated in systems of two interacting qubits. The interaction between the qubits is considered as an XXZ-type exchange interaction, which can make the qubits entangled. A slowly rotating external field is also applied for the Berry phases of the system within the adiabatic theorem. Analytic expressions for the eigenvalues and eigen-wavefunctions of the system are obtained in terms of the interaction parameters and external fields. The competition between the interaction and the external field is shown to be determine a characteristic behavior of the Berry phases and concurrences. The relation between the Berry phase and entanglement for the eigenstates of the system is found to be unique as the interaction strengths vary. The way in which anisotropy of the interaction reveals the unique relations between the Berry phases and the entanglements is discussed.
A Circuit Simulation Model for An Uitra-fast IGBT And Analysis of Parameter Sensitivity
Ai-min Li,Xiang-ning He,Zhao-ming Qian 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
Based on existing built-in models of PSpice, by the composite model principle, a composite Insulated Gate Bipolar Transistor (IGBT) model for an ultra-fast IGBT is presented Comparison between measurement and simulation results shows good agreement in transient and steady-state behaviour of the IGBT Parametric sentive analysis of this model is performed, and validity of the composite model is discussed.
Ai-Min Wu,Jason Pui Yin Cheung,Kenneth Man Chee Cheung,Jia-Liang Lin,Hai-Ming Jin,Dong Chen,Xiang-Yang Wang,Jie Zhao,Kenny Yat Hong Kwan 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.4
Magnetically controlled growing rods have been used to treat early-onset scoliosis for the last 9 years; however, few studies have been published, with only short-term follow-up. The aim of the present study is to systematically review the outcomes of magnetically controlled growing rods in the treatment of early-onset scoliosis with a minimum of 2-year follow-up. Studies were included if patients with early-onset scoliosis (scoliosis diagnosed before 10 years of age) underwent implantation of magnetically controlled growing rods with a minimum of 2-year follow-up. The literature review and data extraction followed the established preferred reporting items for systematic review and meta-analysis guidelines. Data of distraction frequency, number of distractions, distracted length, Cobb angle, kyphosis, T1–T12 length, and T1–S1 length preoperatively, postoperatively, and at final follow-up were collected. Data regarding complications and unplanned reoperations were also extracted. The mean values of these parameters were calculated, or pooled meta-analysis was performed if available. Ten articles were included in this systematic review, with a total of 116 patients and a follow-up period between 23 and 61 months. The mean preoperative Cobb angle and kyphosis angle were 60.1° and 38.0°, respectively, and improved to 35.4° and 26.1° postoperatively. At final follow-up, the Cobb and kyphosis angles were maintained at 36.9° and 36.0°, respectively. The average preoperative T1–T12 and T1–S1 lengths were 180.6 mm and 293.6 mm, respectively, and increased to 198.3 mm and 320.3 mm postoperatively. T1–T12 and T1–S1 lengths were 212.3 mm and 339.3 mm at final follow-up, respectively. The overall rate of patients with complications was 48% (95% confidence interval [CI], 0.38–0.58) and unplanned reoperation 44% (95% CI, 0.33–0.55) after sensitivity analysis. The current evidence from different countries with a minimum of a 2-year follow-up suggests that magnetically controlled growing rods are an effective technique to treat pediatric scoliosis and promote spine growth. However, nearly half of patients still developed complications or required unplanned reoperations.
( Ai Min Zhang ),( Dong Cheng Han ),( Zhi Qing Zhu ),( Jung Woo Lee ),( Hyun Ku Rhee ) 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.4
Carbon nanotubes were synthesized by chemical vapor deposition and subsequently purified and oxidized by repeated treatment with nitric acid. After acid treatment the walls of carbon nanotubes became thinner and the surface area increased. The Ni-supported carbon nanotubes prepared by impregnation were applied to the cracking of nheptane to show an excellent activity. This indicates that the carbon nanotubes can serve as a good catalyst support with high dispersion of metallic components. The optimum Ni loading turned out to be about 5.2 mmol/g. The cracking product was found to contain mainly small hydrocarbons; thus the Ni-supported carbon nanotubes may be applied as a potential catalyst to the cracking of heavy hydrocarbons.
Subsidy Program Evaluation based on Rough Set
Ai-Min Yang,Wen-Rui Wu,Di Zhang,Xing-Jun Luo,Yang Han 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.11
Taxi subsidy program established is reasonable or not is one important step to research the "taxi difficult" issue in today's society. In this paper, we analyze the correlation of the three indicators and 15 factors, get the correlation between the index and its influencing factors, then reuse roughset preliminary screening for data factors, combined factor analysis to obtain the final subsidy program evaluation model. Substituted into the value of the three indicators before and after subsidies respectively, obtained the evaluation value before andafter the subsidy. Q1, Q2, andQ1Q2, the subsidy program for "ease taxi difficult" has some help.