固体超强酸SO_4~(2-)/T_iO_2催化合成三醋酸甘油酯

试验用固体超强酸■催化醋酸和甘油合成三醋酸甘油酯。考察了催化剂活化温度与催化活性之间的关系,用正交试验法研究了反应因素对收率的影响,在最佳条件下,收率达89％。     

The promises,challenges and pathways to room-temperature sodium-sulfur batteries

Room-temperature sodium-sulfur batteries (RT-Na-S batteries) are attractive for large-scale energy storage applications owing to their high storage capacity as well as the rich abundance and low cost of the materials. Unfortunately, their practical application is hampered by severe challenges, such as low conductivity of sulfur and its reduced products, volume expansion, polysulfide shuttling effect and Na dendrite formation, which can lead to rapid capacity fading. The review discusses the Na-S-energy-storage chemistry, highlighting its promise, key challenges and potential strategies for large-scale energy storage systems. Specifically, we review the electrochemical principles and the current technical challenges of RT-Na-S batteries, and discuss the strategies to address these obstacles. In particular, we give a comprehensive review of recent progresses in cathodes, anodes, electrolytes, separators and cell configurations, and provide a forward-looking perspective on strategies toward robust high-energy-density RT-Na-S batteries.     

课堂观察实施的现状分析与思考

课堂观察作为教师一种新兴的有效的教学研究方式,正在各地蓬勃开展,但在实施进程中,还是存在着研究目标有偏差、研究流程趋僵化、研究团队只应付、研究内容停留表面等迫切需要解决的问题,需要教师在以后的课堂观察实践中紧扣专题、注重学科、走向灵活、指向改进,让课堂观察更好地为教师的教学行为改进服务。     

工作记忆的ERP研究

随着实验技术的创新,ERP技术近年已被广泛用于工作记忆研究。工作记忆的典型ERP效应包括P300、N400、CNV及其他皮层慢电位的波幅和潜伏期变化模式。ERP指标的应用极大地促进了对视觉工作记忆、言语工作记忆和中央执行系统心理和生理机制的研究。ERP研究技术和方法的进一步改进和完善将能更充分发挥其在工作记忆研究中的价值。     

《立体几何》的文艺解读

《立体几何》的主人公在阅读曾祖父的日记时，对立体几何学说中“无表面的平面”所引起的惊异，让他烦躁的生活发生了翻天覆地的变化。文艺学美学的每一种方法都有其优越之处，但单独使用任何一种方法都不能完全抓住作品的内涵，论者于此通过社会历史研究法、精神分析研究法、象征主义研究法三种文艺学美学方法对小说进行分析，从而探讨了小说所隐藏的意蕴。     

甘氨酸亚铁制备及热化学性质研究

研究了固相研磨法、固相催化研磨法和熔融法三种实验条件下,甘氨酸与硫酸亚铁铵以物质的量之比2:1反应得到二价亚铁与甘氨酸的配合物.通过对配合物进行红外光谱表征和定量分析,得到二价亚铁配合物的组成为[Fe(Gly)2].最后,根据熔解-量热法的基本操作条件,设计了热化学循环,测量了反应物和产物的标准摩尔溶解焓,结合热化学原理,测定了甘氨酸亚铁的标准摩尔生成焓.     

Triethoxysilane with oligo（ethylene oxide） substituent as film forming additive for graphite anode

{3-[2-(2-methoxyethoxy) ethoxy]-propyl} triethoxysilane (TESM2) was synthesized and used as an electrolyte additive to improve the performances of lithium-ion batteries (LIBs). The electrochemical properties of the electrolyte (1 mol/L lithium hexafluorophosphate (LiPF₆)/ethylene carbonate (EC):diethylene carbonate (DEC):dimethyl carbonate (DMC), 1:1:1) with different contents of TESM2 were characterized by ionic conductivity measurement, galvanostatic charge/discharge test of graphite/Li half cells, and electrochemical impedance spectroscopy. Both the cycling performances and C-rate capabilities of graphite/Li half cells were significantly improved with an optimized content of 15% TESM2 in the electrolyte. The graphite/Li half cell delivered a very high specific capacity of 370 mAh/g at 0.2C rate without any capacity loss for 60 cycles, and retained a capacity of 292 mAh/g at 2C rate. The solid electrolyte interphase (SEI) film on the surface of the graphite anode was investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), indicating that TESM2 was effectively involved in the formation of SEI film on the surface of graphite.     

月经周期对运动能力的影响

月经周期除了对生殖功能有影响外,还会影响许多其他的生理机能,在运动中的变化还会影响运动能力.探讨月经周期对能量代谢底物、短时间极量运动和亚极量运动的影响.     

"人文奥运"语境下的传统体育文化本源回归与实践价值

采用文献综述、文化学和逻辑分析等方法，探讨了传统体育文化的内在特质与人文奥运价值的本质与归位。传统文化的积淀和固有的传统思雏模式形成的本民族传统特色和技艺，在与现代奥林匹克文化的交汇中，其所蕴涵的民族价值观、人文精神、人本思想及其“和谐”的发展观，经多元融合、相互吸纳、补充发展成为现代奥林匹克运动可持续发展的内在动力．．传统体育文化经过创造性的转换，将逐渐回归现代社会，中国传统体育文化期待在与奥林匹克文化相互交融中实现和而不同、和谐发展的历史演变。