Corn rod-like WO<sub>3</sub> nanomaterials were successfully synthesized by a simple hydrothermal method. The morphology, structure and optical absorption properties of the prepared samples were characteri...Corn rod-like WO<sub>3</sub> nanomaterials were successfully synthesized by a simple hydrothermal method. The morphology, structure and optical absorption properties of the prepared samples were characterized by SEM, XRD, FTIR and UV-Vis-DRS. The WO<sub>3</sub> materials were corn rod-like morphology with about 800 nm for length and 150 nm for diameter, especially there were plenty of corn particles (about 20 nm) on the surface of corn rods. The X-ray diffraction peaks of the products corresponded with WO<sub>3</sub> standard card, and the characteristic peak of W-O bond was found in the infrared spectrum. The absorption band edge of the products was about 480 nm, indicating their potential visible-light-induced photocatalytic activity. In situ FTIR technology research showed that the prepared WO<sub>3</sub> nanomaterials had visible photocatalytic activity to gas-phase toluene. After a photocatalytic reaction for 8 hours toluene was effectively degraded, and carboxylic acid and aldehyde could be regarded as the intermediate products, and CO<sub>2</sub> was produced as the final product during the reaction process.展开更多
教师专业自主是教师专业发展的重要内容。本文通过筛选Web of Science核心合集数据库中1985-2020年与教师专业自主相关的1286篇文献为研究对象,运用具有可视化功能Citespace V5.7.R4引文分析软件,以发文时序、发文期刊、主要发文国家与...教师专业自主是教师专业发展的重要内容。本文通过筛选Web of Science核心合集数据库中1985-2020年与教师专业自主相关的1286篇文献为研究对象,运用具有可视化功能Citespace V5.7.R4引文分析软件,以发文时序、发文期刊、主要发文国家与地区、高被引文献、高频突显关键词等视角,对精炼后的文献进行数据统计和可视化分析,厘清了教师专业自主的历史发展进程,突出了教师专业自主的研究重点,深入分析了教师专业自主的内涵演变历程,即从强调“独立自主”走向强调“合作自主”;从关注“教学自主”走向关注“多维自主”;从“自主作为权利”走向“自主作为责任”;从抵御“被动自主”走向呼吁“能动自主”。展开更多
Along with the popularity of environmental protection concepts, the environmental treatment of water pollution attracts widespread attention, among which, the research on Bi-based semiconductor photocatalytic degradat...Along with the popularity of environmental protection concepts, the environmental treatment of water pollution attracts widespread attention, among which, the research on Bi-based semiconductor photocatalytic degradation technology has made great progress. However, the development of such bismuth-based composites still remains a challenging task due to difficult recovery and low catalytic efficiency. Herein, a novel CC/BiPO4</sub>/Bi2</sub>WO6</sub> composite was successfully synthesized through two-step hydrothermal method using activated flexible carbon cloth as a substrate. The results of the photocatalytic degradation experiments showed that the obtained CC/BiPO<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> composites can degrade 92.1% RhB in 60 min under UV-visible light irradiation, which was much higher than that of unloaded BiPO4</sub> (24.4%) and BiPO4</sub>/Bi2</sub>WO6</sub> (52.9%), exhibiting a better adsorption-photocatalytic degradation performance than BiPO4</sub> and BiPO4</sub>/Bi2</sub>WO6</sub>. Photoluminescence spectra indicated that the improved photocatalytic activity was due to the more effective inhibition of photogenerated carrier complexation. Furthermore, the radical capture experiments confirmed that h<sup>+</sup>, ·OH and O<sub>2</sub>-</sup> were the main active substances in the photocatalytic degradation process of RhB by the CC/BiPO4</sub>/Bi2</sub>WO6</sub> composites. More importantly, the prepared CC/BiPO4</sub>/Bi2</sub>WO6</sub> composite had a simple separation process and good recycling stability, and its photocatalytic degradation efficiency can still reach 53.3% after six cycles of RhB degradation. .展开更多
背景:基于主题文献的计量学和可视化分析对了解绝经后骨质疏松症研究基础与前沿尤为重要。目的:对近20年绝经后骨质疏松研究的高被引SCI论文进行文献计量、引证和可视化分析。方法:对Web of Science(WoS)中SCI-EXPANDED收录的2003-2022...背景:基于主题文献的计量学和可视化分析对了解绝经后骨质疏松症研究基础与前沿尤为重要。目的:对近20年绝经后骨质疏松研究的高被引SCI论文进行文献计量、引证和可视化分析。方法:对Web of Science(WoS)中SCI-EXPANDED收录的2003-2022年发表的前100篇高被引绝经后骨质疏松研究论文进行文献计量,用CiteSpace软件进行可视化分析。结果与结论:前100篇高被引论文在WoS核心合集中总被引量为67377次,每篇论文的年平均引用量为49.17次。绝经后骨质疏松研究主要涉及医学、工程技术、生物学和多学科等领域,小类学科则以内分泌学与代谢、医学:内科为主。国际上形成了稳定密切的核心合作网络关系,美国、加利福尼亚大学系统、Cummings,Steven R分别是高被引论文发文最多的国家、科研机构和作者。绝经后骨质疏松研究前沿主要涉及了钙剂、维生素D的补充治疗与骨折风险,双膦酸盐类药物治疗绝经后骨质疏松的临床研究,非典型股骨骨折,绝经后骨质疏松的新药临床研究与序贯治疗,骨折风险的预测指标,骨质疏松性椎体压缩骨折的中长期随访,基因多态性和遗传因素,绝经后骨质疏松临床实践指南的制定和更新等方面。大型的队列研究、高质量随机对照试验、系统综述和荟萃分析、临床实践指南是推动绝经后骨质疏松临床研究发展的巨大引擎。中国应在上述研究领域加大投入,以提高国际影响力。展开更多
文摘Corn rod-like WO<sub>3</sub> nanomaterials were successfully synthesized by a simple hydrothermal method. The morphology, structure and optical absorption properties of the prepared samples were characterized by SEM, XRD, FTIR and UV-Vis-DRS. The WO<sub>3</sub> materials were corn rod-like morphology with about 800 nm for length and 150 nm for diameter, especially there were plenty of corn particles (about 20 nm) on the surface of corn rods. The X-ray diffraction peaks of the products corresponded with WO<sub>3</sub> standard card, and the characteristic peak of W-O bond was found in the infrared spectrum. The absorption band edge of the products was about 480 nm, indicating their potential visible-light-induced photocatalytic activity. In situ FTIR technology research showed that the prepared WO<sub>3</sub> nanomaterials had visible photocatalytic activity to gas-phase toluene. After a photocatalytic reaction for 8 hours toluene was effectively degraded, and carboxylic acid and aldehyde could be regarded as the intermediate products, and CO<sub>2</sub> was produced as the final product during the reaction process.
文摘教师专业自主是教师专业发展的重要内容。本文通过筛选Web of Science核心合集数据库中1985-2020年与教师专业自主相关的1286篇文献为研究对象,运用具有可视化功能Citespace V5.7.R4引文分析软件,以发文时序、发文期刊、主要发文国家与地区、高被引文献、高频突显关键词等视角,对精炼后的文献进行数据统计和可视化分析,厘清了教师专业自主的历史发展进程,突出了教师专业自主的研究重点,深入分析了教师专业自主的内涵演变历程,即从强调“独立自主”走向强调“合作自主”;从关注“教学自主”走向关注“多维自主”;从“自主作为权利”走向“自主作为责任”;从抵御“被动自主”走向呼吁“能动自主”。
文摘Along with the popularity of environmental protection concepts, the environmental treatment of water pollution attracts widespread attention, among which, the research on Bi-based semiconductor photocatalytic degradation technology has made great progress. However, the development of such bismuth-based composites still remains a challenging task due to difficult recovery and low catalytic efficiency. Herein, a novel CC/BiPO4</sub>/Bi2</sub>WO6</sub> composite was successfully synthesized through two-step hydrothermal method using activated flexible carbon cloth as a substrate. The results of the photocatalytic degradation experiments showed that the obtained CC/BiPO<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> composites can degrade 92.1% RhB in 60 min under UV-visible light irradiation, which was much higher than that of unloaded BiPO4</sub> (24.4%) and BiPO4</sub>/Bi2</sub>WO6</sub> (52.9%), exhibiting a better adsorption-photocatalytic degradation performance than BiPO4</sub> and BiPO4</sub>/Bi2</sub>WO6</sub>. Photoluminescence spectra indicated that the improved photocatalytic activity was due to the more effective inhibition of photogenerated carrier complexation. Furthermore, the radical capture experiments confirmed that h<sup>+</sup>, ·OH and O<sub>2</sub>-</sup> were the main active substances in the photocatalytic degradation process of RhB by the CC/BiPO4</sub>/Bi2</sub>WO6</sub> composites. More importantly, the prepared CC/BiPO4</sub>/Bi2</sub>WO6</sub> composite had a simple separation process and good recycling stability, and its photocatalytic degradation efficiency can still reach 53.3% after six cycles of RhB degradation. .
文摘背景:基于主题文献的计量学和可视化分析对了解绝经后骨质疏松症研究基础与前沿尤为重要。目的:对近20年绝经后骨质疏松研究的高被引SCI论文进行文献计量、引证和可视化分析。方法:对Web of Science(WoS)中SCI-EXPANDED收录的2003-2022年发表的前100篇高被引绝经后骨质疏松研究论文进行文献计量,用CiteSpace软件进行可视化分析。结果与结论:前100篇高被引论文在WoS核心合集中总被引量为67377次,每篇论文的年平均引用量为49.17次。绝经后骨质疏松研究主要涉及医学、工程技术、生物学和多学科等领域,小类学科则以内分泌学与代谢、医学:内科为主。国际上形成了稳定密切的核心合作网络关系,美国、加利福尼亚大学系统、Cummings,Steven R分别是高被引论文发文最多的国家、科研机构和作者。绝经后骨质疏松研究前沿主要涉及了钙剂、维生素D的补充治疗与骨折风险,双膦酸盐类药物治疗绝经后骨质疏松的临床研究,非典型股骨骨折,绝经后骨质疏松的新药临床研究与序贯治疗,骨折风险的预测指标,骨质疏松性椎体压缩骨折的中长期随访,基因多态性和遗传因素,绝经后骨质疏松临床实践指南的制定和更新等方面。大型的队列研究、高质量随机对照试验、系统综述和荟萃分析、临床实践指南是推动绝经后骨质疏松临床研究发展的巨大引擎。中国应在上述研究领域加大投入,以提高国际影响力。
