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Acquired Localized Hypertrichosis Induced by Internal Fixation and Plaster Cast Application
Hui-Jun Ma,Yang Yang,Hui-Yong Ma,Chi-Yu Jia,Ting-Hui Li 대한피부과학회 2013 Annals of Dermatology Vol.25 No.3
Hypertrichosis refers to increased vellus hair growth and is independent to androgen excess. The acquired localized hypertrichosis (ALH) is one of the typical hypertrichosis,which mainly results from chronic irritation, inflammation,friction, and occlusion by plaster of Paris. Here, we report a young boy who had ALH on his right hand following a closed fracture with internal fixation and plaster cast application. The case is unusual because the hairy area is limited to the operative region of internal fixation. We suggest that the local vascular changes and skin inflammation induced by internal fixation and plaster cast application may be associated with ALH.
Ma, Junpeng,Fan, Jingbiao,Chen, Shang,Yang, Xinyue,Hui, Kwun Nam,Zhang, Hongwen,Bielawski, Christopher W.,Geng, Jianxin American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.14
<P>Lithium-sulfur (Li-S) batteries have received significant attention due to the high theoretical specific capacity of sulfur (1675 mA h g<SUP>-1</SUP>). However, the practical applications are often handicapped by sluggish electrochemical kinetics and the “shuttle effect” of electrochemical intermediate polysulfides. Herein, we propose an in-situ copolymerization strategy for covalently confining a sulfur-containing copolymer onto reduced graphene oxide (RGO) to overcome the aforementioned challenges. The copolymerization was performed by heating elemental sulfur and isopropenylphenyl-functionalized RGO to afford a sulfur-containing copolymer, that is, RGO-<I>g</I>-poly(S-<I>r</I>-IDBI), which is featured by a high sulfur content and uniform distribution of the poly(S-<I>r</I>-IDBI) on RGO sheets. The covalent confinement of poly(S-<I>r</I>-IDBI) onto RGO sheets not only enhances the Li<SUP>+</SUP> diffusion coefficients by nearly 1 order of magnitude, but also improves the mechanical properties of the cathodes and suppresses the shuttle effect of polysulfides. As a result, the RGO-<I>g</I>-poly(S-<I>r</I>-IDBI) cathode exhibits an enhanced sulfur utilization rate (10% higher than that of an elemental sulfur cathode at 0.1C), an improved rate capacity (688 mA h g<SUP>-1</SUP> for the RGO-<I>g</I>-poly(S-<I>r</I>-IDBI) cathode vs 400 mA h g<SUP>-1</SUP> for an elemental sulfur cathode at 1C), and a high cycling stability (a capacity decay of 0.021% per cycle, less than one-tenth of that measured for an elemental sulfur cathode).</P> [FIG OMISSION]</BR>
Characteristics of Gas- and Particle-phase Acids and NH₃at Urban and Rural Sites in Korea
Chang-Jin Ma(Chang-Jin Ma),Hui-Kang Kim(Hui-Kang Kim),Gong-Unn Kang(Gong-Unn Kang),Susumu Tohno(Susumu Tohno),Mikio Kasahara(Mikio Kasahara) 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.E1
To study the characteristics of ammonia and the related compounds, atmospheric aerosols and gases were collected using a triple filter pack sampler, a low volume air sampler, and a three-stage Andersen air sampler in Seoul and Kangwha Island, Korea from Dec. 1996 to Oct. 1997. Ammonia concentrations showed approximately two times higher in summer than in winter at both sites. The highest HNO₃ levels were generally observed in summertime at two sampling sites. The average mass concentration of PM_2.5 in heavily industrialized Seoul was about three times higher than that of Kangwha. In winter, the sum of NH₄^+ and its counter ions (such as CI^-, NO₃^-, and S0₄²^-) comprised 30-41% of PM_2.5 mass concentration at each sampling site. Temperature dependence of particulate nitrate was examined at the urban sampling site. The formation of the nitrate in the fine mode was dependent not only on the amount of precursors but also on the variation of temperature. (NH₄)S0₄and NH₄HS0₄coexisted with NH₄NO₃and NH₄Cl at each site. According to the summertime backward trajectory analysis. NO₃- showed higher level with air parcels transported from northeast Asian continent. On the other hand, the concentration of SO₄²- showed significantly higher level when air masses originated from Pacific Ocean, southern part of Japan. and Korea.
From Henan Opera to Taiwan Bangzi-Localisation and Identity of Taiwan Bangzi
Ma Ming-Hui,Assistant professor 아시아음악학회 2014 Asian Musicology Vol.23 No.-
A foreign Henan Opera has survived, changed, and localised and established its Taiwan identity from Henan Opera to Taiwan Bangzi for more than sixty years in Taiwan, since it was introduced from China to Taiwan under a historical occasion. This paper examines the localising process from Henan Opera to Taiwan Bangzi in Taiwan from four perspectives: social and cultural background, performers, contents of scripts, and textures of music. The time frame is divided into two periods (1947-1987 and 1987-2013) to discuss the processes separately.
Biological characterization of mesenchymal stem cells from bovine umbilical cord
Hui Xiong,Wei Jun Guan,Yue Hui Ma,Chunyu Bai,Shuang Wu,Yuhua Gao,Taofeng Lu,Qingyun Hu 한국통합생물학회 2014 Animal cells and systems Vol.18 No.1
Mesenchymal stem cells (MSCs) are multi-potential cells that are able to proliferate and differentiate into othercell types. Much research has been done on the MSCs from the umbilical cord (UCMSCs) in human, mice, andavian, but little literature has been published about these cells in big livestock. Here, we choose Luxi cattle asthe experimental animal, we describe an external culture of the UCMSCs from it and summarize the biologicalcharacteristics of these cells, e.g., morphologic appearance, surface antigens, colony-forming ability, geneexpression, and differentiation potential were detected via using immunofluorescence and reverse transcriptionpolymerase chain reaction (RT-PCR). The induced cells, osteoblast, lipoblast, hepatocyte, islet cells, andneurocyte were identified by Alizarin red staining, Oil-red-O staining, Periodic acid-schiff staining, andDithizone staining and RT-PCR detection for specific genes. Results suggest that biological characteristics ofthe UCMSCs were similar to those of MSCs previously analyzed. The primary UCMSCs were sub-cultured topassage 32, the UCMSCs expressed gene CD29, CD44, CD73, CD90, and CD166, induced cells illustratedtypical staining, and expressed specific genes, which indicate that the UCMSCs could be a novel alternativesource of MSCs for experimental and clinical applications.
Research on Carried-Based PWM with Zero-Sequence Component Injection for Vienna Type Rectifiers
Hui Ma,Mao Feng,Yu Tian,Xi Chen 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.2
This paper studies the inherent relationship between currents and zero-sequence components. Then a precise algorithm is proposed to calculate the injected zero-sequence component to control the DC-Link neutral-point voltage balance, which can result in a more efficient and flexible neutral point voltage balance with a desirable performance. In addition, it is shown that carried-based PWM with the calculated zero-sequence component scheme can be equivalent to space-vector pulse-width modulation (SVPWM). Based on the proposed method, the optimal zero-sequence component of the feasible modulation indices is analyzed. In addition, the unbalanced load limitation of the DC-Link neutral-point voltage balance control is also revealed. Simulation and experimental results are shown to verify the validity and practicality of the proposed algorithm.
Hui Ma,Yunxiang Xie,Biaoguang Sun,Lingjun Mo 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.1
This paper uses the switching function approach to present a simple state model of the Vienna-type rectifier. The approach introduces the relationship between the DC-link neutral point voltage and the AC side phase currents. A novel direct power control (DPC) strategy, which is based on the sliding mode control (SMC) for Vienna I rectifiers, is developed using the proposed power model in the stationary α-β reference frames. The SMC-based DPC methodology directly regulates instantaneous active and reactive powers without transforming to a synchronous rotating coordinate reference frame or a tracking phase angle of grid voltage. Moreover, the required rectifier control voltages are directly calculated by utilizing the non-linear SMC scheme. Theoretically, active and reactive power flows are controlled without ripple or cross coupling. Furthermore, the fixed-switching frequency is obtained by employing the simplified space vector modulation (SVM). SVM solves the complicated designing problem of the AC harmonic filter. The simplified SVM is based on the simplification of the space vector diagram of a three-level converter into that of a two-level converter. The dwelling time calculation and switching sequence selection are easily implemented like those in the conventional two-level rectifier. Replacing the current control loops with power control loops simplifies the system design and enhances the transient performance. The simulation models in MATLAB/Simulink and the digital signal processor-controlled 1.5 kW Vienna-type rectifier are used to verify the fast responses and robustness of the proposed control scheme.