The microstructural features of clacium rare earth(Ca RE) fluorocarbonate minerals from Southwest China were studied by using selected area electron diffraction(SAED) and high resolution transmission electron micros...The microstructural features of clacium rare earth(Ca RE) fluorocarbonate minerals from Southwest China were studied by using selected area electron diffraction(SAED) and high resolution transmission electron microscopy(HRTEM). Three new regularly mixed layer structures of B 8S 6 type with long period and different stacking sequence, i.e. B 8S 6 Ⅰ, B 8S 6 Ⅱ, and B 8S 6 Ⅲ, were found in the derived polycrystal of parisite, in which their structural symmetry, cell parameters, chemical formulas of crystal and stacking models of structural unit layer, etc. were determined. The results of this study also show that these new regularly mixed layer structrues were formed by order stacking unit layer of bastnaesite(B) and synchisite(S) in varying proportion along c axis. The observation under HRTEM reveals that in the three new regularly mixed layer structures there are different distribution modes of Ce F ion layers, CO 2- 3 ion groups between the Ce F ion layers, and CO 2- 3 ion groups between Ce F and Ca 2+ ion layers, and there are some heterogeneous textures, such as disorder interlayer and stacking fault. It further proves the complexity of the crystal structure of the Ca RE fluorocarbonate minerals.展开更多
自从1990年Microsoft Windows 3.0问世,许多专家就肯定了Windows必将取代DOS的发展前景。时至今日,Windows已经拥有了相当庞大的用户群,其高级图形用户界面、多任务、自动内存管理等特点,倍受用户青睐。IBM公司也不甘示弱,迅速推出了OS...自从1990年Microsoft Windows 3.0问世,许多专家就肯定了Windows必将取代DOS的发展前景。时至今日,Windows已经拥有了相当庞大的用户群,其高级图形用户界面、多任务、自动内存管理等特点,倍受用户青睐。IBM公司也不甘示弱,迅速推出了OS/2,它的多任务、网络连接等功能也受到一些用户的赞赏。究其将来,鹿死谁手,而今尚不可轻下定论。展开更多
文摘The microstructural features of clacium rare earth(Ca RE) fluorocarbonate minerals from Southwest China were studied by using selected area electron diffraction(SAED) and high resolution transmission electron microscopy(HRTEM). Three new regularly mixed layer structures of B 8S 6 type with long period and different stacking sequence, i.e. B 8S 6 Ⅰ, B 8S 6 Ⅱ, and B 8S 6 Ⅲ, were found in the derived polycrystal of parisite, in which their structural symmetry, cell parameters, chemical formulas of crystal and stacking models of structural unit layer, etc. were determined. The results of this study also show that these new regularly mixed layer structrues were formed by order stacking unit layer of bastnaesite(B) and synchisite(S) in varying proportion along c axis. The observation under HRTEM reveals that in the three new regularly mixed layer structures there are different distribution modes of Ce F ion layers, CO 2- 3 ion groups between the Ce F ion layers, and CO 2- 3 ion groups between Ce F and Ca 2+ ion layers, and there are some heterogeneous textures, such as disorder interlayer and stacking fault. It further proves the complexity of the crystal structure of the Ca RE fluorocarbonate minerals.
文摘自从1990年Microsoft Windows 3.0问世,许多专家就肯定了Windows必将取代DOS的发展前景。时至今日,Windows已经拥有了相当庞大的用户群,其高级图形用户界面、多任务、自动内存管理等特点,倍受用户青睐。IBM公司也不甘示弱,迅速推出了OS/2,它的多任务、网络连接等功能也受到一些用户的赞赏。究其将来,鹿死谁手,而今尚不可轻下定论。
文摘目的探究综合ICU护理交接班循证实践的障碍和促进因素,为推动证据临床转化提供依据。方法采用目的抽样法,选取四川省自贡市某三级甲等医院综合ICU病区的护理管理者和临床护士为研究对象。基于实施性研究综合框架(consolidated framework for implementation research,CFIR)构建访谈提纲,采用半结构式访谈法访谈11名临床护士及护理管理者,采用定向内容分析法对访谈内容进行编码。结果通过访谈共得到涵盖CFIR框架4个维度的6个障碍因素、14个促进因素。归纳总结出4个主题,在实践者层面,综合ICU护士已经充分认识到交接班的重要性,并愿意将交接班循证实践方案列为优先完成事项,但普遍欠缺循证护理知识;在方案层面,交接班循证实践方案具备科学性及有效性,但方案的复杂性阻碍实施;在资源层面,交接班循证实践方案的实施需要人力、时间及信息化系统支持;在组织层面,科室文化、氛围、领导力促进交接班循证实践方案的实施。结论该研究从实践者、方案、可用资源及组织环境4个层面明确了护理交接班相关证据在临床转化的障碍和促进因素,为提升方案临床适用性、拟定变革策略提供了依据。
