Unprecedented and highly stable lithium storage capacity of (001) faceted nanosheet-constructed hierarchically porous TiO2/rGO hybrid architecture for high-performance Li-ion batteries

Active crystal facets can generate special properties for various applications. Herein, we report a (001) faceted nanosheet-constructed hierarchically porous TiO₂/rGO hybrid architecture with unprecedented and highly stable lithium storage performance. Density functional theory calculations show that the (001) faceted TiO₂ nanosheets enable enhanced reaction kinetics by reinforcing their contact with the electrolyte and shortening the path length of Li⁺ diffusion and insertion-extraction. The reduced graphene oxide (rGO) nanosheets in this TiO₂/rGO hybrid largely improve charge transport, while the porous hierarchy at different length scales favors continuous electrolyte permeation and accommodates volume change. This hierarchically porous TiO₂/rGO hybrid anode material demonstrates an excellent reversible capacity of 250 mAh g^–1 at 1 C (1 C = 335 mA g^–1) at a voltage window of 1.0–3.0 V. Even after 1000 cycles at 5 C and 500 cycles at 10 C, the anode retains exceptional and stable capacities of 176 and 160 mAh g^–1, respectively. Moreover, the formed Li₂Ti₂O₄ nanodots facilitate reversed Li⁺ insertion-extraction during the cycling process. The above results indicate the best performance of TiO₂-based materials as anodes for lithium-ion batteries reported in the literature.     

仪式教育对提高医学生医学人文精神的作用分析

根据笔者对中国13所知名高校在读医学生的调查显示,虽然当前各大高校对医学生医学人文精神培育的举措多种多样,但普遍存在医学人文精神的校园文化氛围建设不足的问题,医学生不能受到良好的熏陶。本文追踪和调查开展“在大学毕业生学位授予仪式上重温《医学生誓言》的仪式教育对提高医学生人文精神的应用效果”。结果:实验组和对照组同学的医学人文精神自评分有显著差异,调查也显示实验组同学具有更加坚定的医学信念。结论:仪式教育对提高医学生的医学人文精神具有重要作用,值得推广。     

汉语搭配关系的几种特殊形式

汉语中存在一些特殊的搭配形式,它们具有难分析、难理解、难于用层次分析法惯用的框式图解来图解它们的层次和结构等特点。这些特殊形式,有的造成歧义,有的却增强了语言的表达效果,体现了作家作品的特殊风格。     

论新形势下地方高校的办学定位与特色

地方高校如何科学定位、办出特色是高校生存和发展的基石。为应对当前国际、国内和高等教育自身发展形势中的竞争与挑战,地方高校办学定位与特色显得尤为重要。科学定位是新形势下地方高校发展的必然要求,突出办学特色是新形势下地方高校发展的必然选择。     

让学生生动活泼、主动地发展

研究和实验都表明,当前教学中最为迫切需要解决的问题是如何在课堂教学中发挥学生的主体性.因为传统的教材,只考虑到教师怎样"教",而很少考虑到学生怎样"学".因此,当前大量的教改成果都围绕着如何设计出更好的教法,使教师使用传统教材时能调动学生的参与,提高学生主体地位.由于过于重视教师怎样更能讲得"透彻",教材的编写甚至不惜破坏学科内在的逻辑性,例如,传统教材是把数的分解放在数的加法之前的.但事实上,学生是在懂得了加法之后,才能真正理解数的分解.又如,传统教材把知识分解的很细,这样做只能进行灌注式教学而不利于学生领悟知识.再次,传统教材中的某些内容,会人为地制造教学难点,例如在第一册中出现的所谓"应用题",对于学生的学习并无多少用处,却容易难倒学生.针对这些问题,本学年我校使用的实验教材,编写上力求在由教师"教"转化为学生"学"上面有所突破.     

Analysis of aroma-active compounds in three sweet osmanthus (Osmanthus fragrans) cultivars by GC-olfactometry and GC-MS

Objective: Aroma is the core factor in aromatherapy. Sensory evaluation of aromas differed among three sweet osmanthus (Osmanthus fragrans) cultivar groups. The purpose of this study was to investigate the aroma-active compounds responsible for these differences. Methods: Gas chromatography-olfactometry (GC-O) and GC-mass spectrometry (GC-MS) were used to analyze the aroma-active compounds and volatiles of creamy-white (’Houban Yingui’, HBYG), yellow (’Liuye Jingui’, LYJG), and orange (’Gecheng Dangui’, GCDG) cultivars. Results: Seventeen aroma-active compounds were detected among 54 volatiles. trans-β-Ocimene, trans-β-ionone, and linalool, which were major volatiles, were identified as aroma-active, while cis-3-hexenyl butanoate, γ-terpinene, and hexyl butanoate were also aroma-active compounds, although their contents were low. Analysis of the odors was based on the sum of the modified frequency (MF) values of aroma-active compounds in different odor groups. HBYG contained more herb odors, contributed by cis-β-ocimene and trans-β-ocimene, while LYJG had more woody/violet/fruity odors released by trans-β-ionone, α-ionone, and hexyl butanoate. In GCDG, the more floral odors were the result of cis-linalool oxide, trans-linalool oxide, and linalool. Conclusions: Aroma-active compounds were not necessarily only the major volatiles: some volatiles with low content also contributed to aroma. The aroma differences among the three cultivars resulted from variation in the content of different odor groups and in the intensities of aroma-active compounds.     

基于CDIO的“机电一体化系统设计”课程教学模式探索

CDIO(Conceive Design Implement Operate)工程教育模式提出培养可操作性的能力,这就迫切要求对工程应用型课程进行改革。本文针对现在"机电一体化系统设计"课程的教学效果不甚理想的状况,基于CDIO教育模式对该课程进行一系列课程教学模式改革的探索研究。     

高校业务主管部门廉政建设主体责任探究

党委对党风廉政建设负主体责任。高校各业务主管部门管理着学校的人财物等相关资源,具有较多的廉政风险点和较大的廉政风险。党委落实主体责任,必须强化对业务部门的分解责任、传导责任,通过科学决策制度、公开制度、审计制度、效能监察机制、权力运行监控机制等,实现廉政建设的有序有效开展。     

寻找一种力量：在高等教育国际化与本土化之间

面对党和政府提出的“基本实现教育现代化”的目标和世界教育形势带来的新挑战,高等院校发展的动力只能从教育改革的创新中来.而教育国际化与本土化整合后重构的创造力,正是一股不可忽视的教育动力.梳理和讨论二者理论上呈现出的单螺旋结构及在教育现代化进程中所发挥的作用,依然具有重要的启发和指导意义.