Annealing Effect on the Electron Spin Dynamics in Heavily Mn-doped (Ga,Mn)As

Han Yue,Lin Chen,Haixia Gao,Jianhua Zhao,Xinhui Zhang 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.10

A temperature- and photo-excitation-density-dependent electron spin dephasing process has beenstudied by time-resolved magneto-optical Kerr effect (TR-MOKE) measurements for heavily-doped(Ga,Mn)As after appropriate annealing treatment. Unlike the as-grown (Ga,Mn)As in which sdscattering is dominant for spin dephasing at low temperature, the exchange scattering inducedby Mn ions is efficiently suppressed after annealing. For annealed (Ga,Mn)As, the p-d exchangecoupling proves to be important for the electron spin dephasing process. Moreover, the Coulombscattering arising from the weakly-localized holes and Mn impurities is revealed to play an importantrole in the electron spin dephasing after annealing. Our results demonstrate that the impurityinduceddisorder plays a significant role in the electron spin-dephasing process in (Ga,Mn)As whenMn is over doped by as much as 15%, which is a critical issue that needs to be considered to achievehigh-quality (Ga,Mn)As thin films with a higher Curie temperature TC and better functionality.

Investigating Trends in Research on China’s Sport Policy Using Social Network Analysis and Topic Modeling

Yongdi Wang,김경식,Haixia Yue,Zhentao Liu,Sihong Sui,Wang Mingyi 아시아스포츠융합과학회 2023 Asia Pacific Journal of Applied Sport Sciences Vol.4 No.1

PURPOSE The purpose of the current study was to examine the research trend on China’s sport policy. We proposed three research questions: (a) have the research keywords for China’s sport policy changed over time; (b) which research keywords best represent the past 30 years of research on China’s sport policy; and (c) what are the primary topics of that research? METHOD We searched the core journals on CNKI to determine trends in 30 years of research on China’s sport policy and directions for future research. In order to achieve this goal, we conducted social network analysis using 437 articles published between 1993 and 2020. RESULT First, we found that China’s sport policy-related keywords did not change significantly. Second, the primary keywords over this 30-year period included the following: sport, policy, China, development, system, implementation, innovation, and industry. Third, sport policy scholars focused most often on the sport industry, followed by sport policy development, school sports, sport governance, and mass sports. CONCLUSION To develop sport policy research in China further, private academic organizations (e.g., China’s Society for Sport Policy) need to conduct sport policy studies.

Reliability-based optimization design of carbon fiber reinforced plastics crossbeam of twist-beam suspension

Tao Sun,Rongchao Jiang,Yue Liu,Dawei Liu,Haixia Sun 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.2

Due to the lightweight and excellent mechanical property, carbon fiber reinforced plastics (CFRP) are widely applied in vehicle components. In this paper, a reliabilitybased multi-level optimization method is proposed for the lightweight design of the crossbeam. The CFRP specimens were first fabricated to acquire the mechanical parameters. Then, based on the equal stiffness theory, CFRP was used to replace the material of steel beam and the section was improved. The optimal ply scheme of CFRP beams was determined by ply optimization. On this basis, considering the uncertainty of the ply thickness and the ply angle, the reliability-based multi-objective optimization of CFRP beams was carried out. Finally, entropy weighted grey relational analysis (GRA) was used to determine the lightweight scheme of the crossbeam. The results show that the crossbeam mass is reduced by 59.85 % under the premise of ensuring structural performance and high reliability after multi-level optimization.

Investigating Research Trend of Chinese Wushu: Application of Social Netword Analysis

( Yongdi Wang ),( Kyung Kim ),( Sihong Sui ),( Haixia Yue ) 한국융합과학회 2022 한국융합과학회 국제학술대회자료집 Vol.2022 No.0

Since the founding of the People's Republic of China more than 70 years ago, Wushu, as an organic component of Chinese sports, culture, education and health undertakings, has continuously improved its scientific, in-depth and systematic level of research. It can be divided into the following stages: from the founding of the People's Republic of China to the early stage of the reform and opening up, the learning, training and competition of Wushu produced research results, and scientific research awareness was generally formed; From the reform and opening up to the mid-1990s, the research on Wushu teaching and training continued to deepen, and the research on history, culture and education rose; From the end of the 1990s to the Beijing Olympic Games, the research on the basic theory of Wushu was fruitful, and the dissemination and development became the focus theme; From the Beijing Olympic Games to the new era, Wushu research is more integrated into the national strategy, and the academic system structure is gradually improved (Guo et al., 2021). Key words Network analysis method is a very useful method to study the knowledge structure and research trends of specific topics (Kim et al., 2020; Zhang & Kim, 2021).First, the co word analysis was conducted to identify trends in leisure studies Second, a centrality analysis was performed to identify keywords with influence within quantified abstract data, a cohesive group analysis to identify detailed research areas within the network (Kim, 2018). This research aims to explore the research trend of Chinese Wushu through keyword network analysis. The purpose of this study is to identify research trends by analyzing the frequency of simultaneous occurrence of keywords and identifying keyword networks. To this end, it has established the following two research questions. First of all, as time goes by, what changes have taken place in the research trend of Chinese Wushu? Second, what is the relationship between keywords in Wushu research? Method In order to study the knowledge structure and development trend of Chinese Wushu, we collected 10 core journals from 19 core academic journals on CNKI. Through the analysis and collation of the data, this study divides the data into four periods: the 1990s, the 2000s, the 2010s and the 2020. Through CNKI retrieval of key words related to Wushu, 2891 core journals were finally selected to form bibliographic information for network analysis. Bibliographic information includes author, paper title, journal name, abstract, key words, publication year, etc. Through the analysis and collation of data, this study selected 10 Chinese core journals, a total of 2225 core journals. Findings and Discussions Among them, Chinese Wushu were most published in sports culture guides, reaching 442 articles (19.87%); There are 341 journals of Wuhan Institute of Physical Education (15.33%), 270 journals of Beijing Institute of Physical Education (12.12%), 228 journals of Chengdu Institute of Physical Education (10.25%), etc. The history of martial arts and the training of martial arts athletes show the phenomenon of chain fracture. The culture, movement and education of martial arts have been developing since 1992. Since 2000, the research on martial arts has increased significantly, with the largest increase in the research on martial arts culture; Secondly, the research on martial arts from 2000s-2010s is booming, but the development of martial arts will decline after 2020s. In the next 10 years, there will be a trend of unstable development, which may lead to less and less research on martial arts, and thus become an unexpected topic. The historical stability of martial arts is good, the degree of concern is low, and there may be a slight upward trend; The development of martial arts culture and martial arts education shows a downward trend; The movement of martial arts is on the rise. The central analysis shows that the key words such as martial arts culture and martial arts education are the core content of martial arts research and have high influence.

Molecular Cloning of Hemoglobin Alpha-chain Gene from Pantholops hodgsonii, a Hypoxic Tolerance Species

Yingzhong, Yang,Droma, Yunden,Guoen, Jin,Zhenzhong, Bai,Lan, Ma,Haixia, Yun,Yue, Cao,Kubo, Keishi,Rili, Ge Korean Society for Biochemistry and Molecular Biol 2007 Journal of biochemistry and molecular biology Vol.40 No.3

To investigate the possible mechanisms of high-altitude native animals in adapting to high altitude, we cloned hemoglobin alpha-chain (alpha-chain Hb) gene from Pantholops hodgsonii, an animal species that indigenously lives at elevations of 3700-5500 m on the Qinghai-Tibetan plateau. Using reverse transcription polymerase chain reaction (RT-PCR) technique, the alpha-chain Hb gene was amplified from total RNA in the liver of the Pantholops hodgsonii. TA cloning technique was used and the PCR product was cloned into pGEM-T vector. The DNA sequence of the gene was highly homologous with sheep (99.1%), goat (98.6%), cattle (95.6%) and human (86.5%). The alpha-chain Hb gene encoded a 142-amino acid protein that could be identified with the homology of alpha-chain Hb protein in sheep (98%), goat (96%), cattle (91%) and human (87%). However, 18 alternations were detected when compared with the alpha-chain Hb gene in human, and 2 in sheep. Moreover, the alterations of a117 GluAsp and $\alpha$132 AsnSer in important regions were noted in human and sheep, respectively. Phylogenetic analysis suggested that the structure of alpha-chain Hb was highly similar to that in sheep. This study provided essential information for elucidating the possible roles of hemoglobin in adapting to extremely high altitude in Pantholops hodgsonii.