The Intellectual Structure of Research on Educational Technology in Science Education (ETiSE): A Co-citation Network Analysis of Publications in Selected Journals (2008–2013)

The main purpose of this paper is to investigate the intellectual structure of the research on educational technology in science education (ETiSE) within the most recent years (2008–2013). Based on the criteria for educational technology research and the citation threshold for educational co-citation analysis, a total of 137 relevant ETiSE papers were identified from the International Journal of Science Education, the Journal of Research in Science Teaching, Science Education, and the Journal of Science Education and Technology. Then, a series of methodologies were performed to analyze all 137 source documents, including document co-citation analysis, social network analysis, and exploratory factor analysis. As a result, 454 co-citation ties were obtained and then graphically visualized with an undirected network, presenting a global structure of the current ETiSE research network. In addition, four major underlying intellectual subfields within the main component of the ETiSE network were extracted and named as: (1) technology-enhanced science inquiry, (2) simulation and visualization for understanding, (3) technology-enhanced chemistry learning, and (4) game-based science learning. The most influential co-citation pairs and cross-boundary phenomena were then analyzed and visualized in a co-citation network. This is the very first attempt to illuminate the core ideas underlying ETiSE research by integrating the co-citation method, factor analysis, and the networking visualization technique. The findings of this study provide a platform for scholarly discussion of the dissemination and research trends within the current ETiSE literature.     

CPV边界积分的对称数值求积法

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｔｈｅｂｏｕｎｄａｒｙｉｎｔｅｇｒａｌｅｑｕａｔｉｏｎｓａｒｉｓｅｉｎｍａｎｙｐｒｏｂｌｅｍｓｏｆｐｈｙｓｉｃｓａｎｄｅｎｇｉｎｅｅｒｉｎｇ .Ｏｎｅｏｆｔｈｅｐｒｉ ｍａｒｙｍａｔｈｅｍａｔｉｃａｌａｎｄｎｕｍｅｒｉｃａｌｄｉｆｆｉｃｕｌｔｉｅｓｏｆｂｏｕｎｄａｒｙｉｎｔｅｇｒａｌｅｑｕａｔｉｏｎａｐｐｅａｒｓｔｏｂｅｔｈｅｔｒｅａｔ ｍｅｎｔｏｆｔｈｅｓｉｎｇｕｌａｒｋｅｒｎｅｌｓ.Ｔｈｅｒｅａｒｅｔｈｒｅｅｄｉｆｆｅｒ ｅｎｔｔｙｐｅｓｏｆｓｉｎｇｕｌａｒｉｔｉｅｓ…     

HiHiLo对女子跆拳道运动员安静及定量负荷运动后血液粘度、红细胞变形能力的影响研究

摘要：目的：观察四周HiHiLo对女子跆拳道运动员安静及定量负荷后血液流变学特征的影响,探讨HiHiLo提高有氧能力的可能机制。对象和方法：8名国家跆拳道女子运动员,在模拟海拔2 500 m的低氧环境下HiHiLo4周。观察HiHiLo前、3 a、4周后安静状态及定量负荷后血液流变性、运动能力的变化。结果：4周HiHiLo后,4000米跑和PWC170成绩有显著提高（P<0.01）;安静状态下,各切变率血液粘度显著低于HiHiLo前,红细胞变形能力显著提高;定量负荷后,HiHiLo4周后,高、中、低切变率下,只有低切的血液粘度显著低于HiHiLo前(P<0.05),红细胞变形能力显著高于HiHiLo前(P<0.05)。急性低氧（3 a）,各指标与HiHiLo前后均无显著性差异。结论：4周HiHiLo能够显著提高受试者的运动能力。HiHiLo4周后,安静状态下血液流变学发生了适应性改变;定量负荷后,低切变率血液粘度和红细胞变形能力的适应性改善有利于微循环的有效灌注。血液流变性的适应性改变可能是HiHiLo提高运动能力的机制之一。急性低氧暴露不能改善血液流变性。     

芍药属牡丹组分类新注

自我们近年发表一系列牡丹组分类文章以来, 国内外基本上赞同我们8个种的分类系统,但对一些问题仍有不同见解。本文进一步申述牡丹Paeonia suffruticosa Andrews 是一个独立的种而不是人工杂种, 以及银屏牡丹P. suffruticosa ssp. yinpingmudan是牡丹P. suffruticosa的野生类型而不是逸生的P. ostii的理由。上述论点也得到了分子树的支持。P. jishanensis T. Hong & W. Z. Zhao是一个合法名称, 而P. spontanea (Rehder) T. Hong & W. Z. Zhao则确实是一个多余名。太白山紫斑牡丹的学名应是P. rockii ssp. atava (Brühl) D. Y. Hong & K. Y. Pan, 因此P. moutan Sims ssp. atava Brühl不应是可疑的分类群。本文还对Halda的6个组合和两个杂交种名作了处理。结果, 本文包括了5个新异名和一个新组合。     

轮钟花属的恢复及其花粉和种皮证据

光学显微镜和扫描电镜观察表明,金钱豹属(广义)花粉明显分为两个类型:Campanumoea inflata和C.javanica subsp.laponica的花粉5～8沟,外壁具相对密的短刺,刺高不过1μm,而C.lancifolia,C.celebica和C.parviflora的花粉3孔沟,外壁刺稀疏,高于2μm。种子表面纹饰也同样可分为  两类,前两个种一类,其种子表面网状,网眼规则而多角形,直径大于网脊宽度,网脊上的次级纹饰为念  珠状,而后三种为一类,其种子表面网眼不规则,直径与网脊宽度近相等,网脊上的次级纹饰绳索状。可  见花粉特征与种皮性状是高度相关的。后三个种所属的分类群就是被归并了的属Cyclocodon Griffith。  综合花粉、种皮及外部形态,这个属应予恢复。其近缘属应是Platycodon,而不是Campanumoea。     

领春木的染色体数目及配子体的发育

本文报道了领春木属的一个国产种Euptelea pleiospermum Hook.f.et Thoms的染色体数目，n=14，2n=28。描述了它的胚珠结构，大小孢子的发育及胚囊的类型。     

The mainstream and extension of contemporary virtual reality education research: Insights from a co-citation network analysis (2015–2020)

Educational technology research and development - Previous studies have provided various reviews with either general or specific scopes to understand virtual reality (VR) technologies for learning...     

Did library learners benefit from m-learning strategies? Research-based evidence from a co-citation network analysis of the literature

Educational technology research and development - Mobile learning strategies have been employed for social learning activities, including library- and museum-supported learning. Previous studies...     

芍药属牡丹组（Paeonia sect. Moutan）种间关系的分子证据：GPAT基因的PCR-RFLP和序列分析

为了探讨芍药属牡丹组Paeonia sect. Moutan的种间关系，对采自15个野生居群，代表牡丹组全部8个野生种的15份材料的GPAT 基因片段（外显子5和6之间2 kb的内含子）进行了PCR-RFLP分析，并对代表牡丹组全部8个野生种的9份材料进行了测序。 根据12个限制性内切酶的PCR-RFLP数据，使用Network 3.0计算机程序的RM (reduced-median)法建立了牡丹组种间亲缘关系网络树。同时根据8个种9份材料的GPAT基因片段序列，利用PAUP*4.0计算机程序建立了牡丹组GPAT基因的最大简约（MP）树和邻接(NJ)树。结果获得了具有很高自展值支持、分辨良好的牡丹组种间关系（GPAT基因）树。最重要的是，该基因树所显示的牡丹组种间关系与根据形态学证据提出的牡丹组的种间关系基本吻合，并得到其他研究证据的支持。根据这一结果，对牡丹组的种间关系进行了详细的讨论。     

葡萄科植物叶表皮特征及其系统学意义

在光学显微镜和扫描电镜下，对葡萄科Vitaceae11属37种代表植物的叶表皮特征进行了观察，发现该科植物叶表皮细胞形状为无规则形或多边形，垂周壁一般为平直、弓形或浅波状;气孔器通常仅分布在下表皮（火筒树属Leea偶尔可在上表皮观察到），除无规则型（地锦属Parthenocissus、俞藤属Yua、葡萄属Vitis、蛇葡萄属Ampelopsis和酸蔹藤属Ampelocissus）最为常见外，不等细胞型（火筒树属）、短平列型（白粉藤属Cissus、乌蔹莓属Cayratia和崖爬藤属Tetrastigma）、