摘要：Si C nanowires are excellent high-temperature electromagnetic wave (EMW) absorbing materials. However, their polymer matrix composites are difficult to work at temperatures above 300℃, while their ceramic matrix composites must be prepared above 1000℃ in an inert atmosphere. Thus, for addressing the abovementioned problems, SiC/low-melting-point glass composites were well designed and prepared at 580℃ in an air atmosphere. Based on the X-ray diffraction results, SiC nanowires were not oxidized during air atmosphere sintering because of the low sintering temperature. Additionally, SiC nanowires were uniformly distributed in the glass matrix material. The composites exhibited good mechanical and EMW absorption properties. As the filling ratio of SiC nanowires increased from 5wt%to 20wt%, the Vickers hardness and flexural strength of the composite reached HV 564 and 213 MPa, which were improved by 27.7%and 72.8%, respectively, compared with the low-melting-point glass. Meanwhile, the dielectric loss and EMW absorption ability of SiC nanowires at 8.2–12.4 GHz were also gradually improved. The dielectric loss ability of low-melting-point glass was close to 0. However, when the filling ratio of SiC nanowires was 20wt%, the composite showed a minimum reflection loss (RL) of-20.2 dB and an effective absorption (RL≤-10 dB) bandwidth of2.3 GHz at an absorber layer thickness of 2.3 mm. The synergistic effect of polarization loss and conductivity loss in SiC nanowires was responsible for this improvement.

摘要：为满足汉语水平参差、学习背景多元的高级对外汉语学习者的需求,自2014年始,研究者采用专题研习法进行高级对外汉语交际课程的教学。以专题研习为本的课程不但可以为学生创造具较强目的性的语言输入、输出机会,凸显语言学习的特性,还可以加强学生的学习动机,提升学生学习的合作性和自主性(Stoller,2006)。2016年,研究者对专题研习的效能进行研究,发现如果能打破空间和时间局限,利用网络进行部分教学,则有可能最大化地发挥专题研习的特点(Liang&Lam,2017)。2017—2018年,研究者结合教育技术与专题研习法,建设了一个高级对外汉语交际课程教育技术平台。该教育技术平台提供了六种独特的功能:电子教材、阅读模块、写作模块、口语模块、中文网络词典以及自学模块。除了展示加强版课程和配合课程设计的技术平台外,本研究致力于探究教育技术的运用能否强化上述专题研习的特点,更进一步提高学生的学习成果。本研究主要采用问卷调查和焦点小组访谈的形式进行,并辅以文件分析。研究结果显示,教育技术与专题研习法的结合对不同学习背景和学习需求的学生有莫大裨益。

摘要：Based on the analysis of the historical background and current situation of the study of Vietnamese Chinese poetry, this paper analyzes the achievements and shortcomings of the existing research. It is found that although there are a large number of authors and achievements in the study of Vietnamese Chinese poetry in the past 40 years, it still stays in the low level of work elaboration and literature review, and lacks of theoretical and systematic research. The main purpose of this article is to analyze the current situation of Vietnamese Chinese poetry research, and to explore the new path and method of Chinese scholars’ research on Vietnamese Chinese poetry through comparative analysis of domestic and foreign research results.

摘要：This paper mainly discusses the diplomatic way of Vietnamese envoys through literature during their mission toChina, including the group, communication mode and reason of the literary exchange between Vietnam envoy andChinese literati. The article points out that the Chinese literati contacted by Vietnamese envoys could be dividedinto Lingnan literati group (Guangdong and Guangxi provinces), Huguang literati group (Hunan and Hubeiprovinces), Jiangnan literati group (Southern Anhui and Jiangsu provinces), and Northern literati group (Henan &Hebei provinces and Beijing). There are three main ways of literary communication between Vietnamese envoysand Chinese literati: the first is to give poems to each other according to fixed rhythm;the second is to communicateby writing;the third is to comment on poems each other. There are two main reasons for the literary exchangebetween Vietnamese envoys and Chinese literati: on the one hand, they wanted to achieve the purpose of “poetrydiplomacy” with literature, and took the initiative to communicate with Chinese literati;on the other hand, Chineseliterati were curious about Vietnamese envoys, so they asked Vietnamese envoys to give poems, or even paid fortheir literary works. The literary exchange between Vietnamese envoys and Chinese literati is a direct reflection ofthe literary exchange between China and Vietnam, from which we can see that the Chinese literature of Vietnam inthe feudal period is an important part of the Chinese cultural circle.