Inspired by the movement of duck that is able to move on land and water utilizing its webbed feet, a novel design of an amphibious robot has been presented in this paper. In contrary, the orthodox design of amphibious...Inspired by the movement of duck that is able to move on land and water utilizing its webbed feet, a novel design of an amphibious robot has been presented in this paper. In contrary, the orthodox design of amphibious robot utilizes the tracks or wheels on land and switches to the propeller to move in water. The proposed design employs same propulsion system as webbed feet to move on land and water. After studying the movement of the duck underwater, a conclusion has been drawn that it is swimming in the water by moving its webbed feet back and forth to generate force to push its body forward. Recreating this phenomenon of duck movement, hybrid robot locomotion has been designed and developed which is able to walk, swim and climb steps using the same propulsion system. Moreover, webbed feet would be able to walk efficiently on muddy, icy or sandy terrain due to uneven distribution of robot weight on the feet. To be able to justify the feasibility of the design, simulations are being carried out using SimulationXpress of the SOLIDWORKS software.展开更多
目的为肿瘤类器官的进一步研究提供参考。方法检索Web of Science核心合集数据库自建库起至2023年12月31日有关肿瘤类器官研究的文献,使用VOSviewer 1.6.18版可视化分析软件对纳入文献的年发文量、国家/地区分布情况、作者和机构合作关...目的为肿瘤类器官的进一步研究提供参考。方法检索Web of Science核心合集数据库自建库起至2023年12月31日有关肿瘤类器官研究的文献,使用VOSviewer 1.6.18版可视化分析软件对纳入文献的年发文量、国家/地区分布情况、作者和机构合作关系、期刊载文情况、关键词共现、文献共被引等进行文献计量学分析。结果共纳入5188篇文献,始发于1992年,2016年起呈暴发式增长趋势。发文量最大的国家/地区与研究机构分别为美国(2037篇,39.26%)和美国哈佛医学院(158篇)。作者合作分析中,CLEV⁃ERS H的发文量(103篇)和共被引频次(23152次)均排名第1。发文量最大与被引频次最多的期刊分别为Cancers(226篇)和Gastro⁃enterology(6847次)。共被引频次排名前10的文献中有8篇出自CLEVERS H领导的团队。关键词共现分析表明,该研究领域的研究热点主要集中在类器官、癌症、肿瘤微环境、药物筛选、精准医疗、个性化医疗、患者来源的类器官、干细胞、三维培养、组织工程等。结论采用文献计量学方法,可直观、清晰地了解肿瘤类器官的研究现状与热点。展开更多
以Web of Science核心合集为数据检索平台,选取2010—2022年231篇“战争纪念性景观”为主题的英文文献,采用CiteSpace可视化文献计量软件,绘制知识图谱,揭示国外战争纪念性景观研究现状、热点和前沿.结果表明:国外战争纪念性景观研究经...以Web of Science核心合集为数据检索平台,选取2010—2022年231篇“战争纪念性景观”为主题的英文文献,采用CiteSpace可视化文献计量软件,绘制知识图谱,揭示国外战争纪念性景观研究现状、热点和前沿.结果表明:国外战争纪念性景观研究经历探索发展阶段(2010—2014年)、稳定发展阶段(2015—2018年)和震荡发展阶段(2019—2022年)三个阶段;作者和机构合作网络结构稀疏,均未建立紧密的联系网络.研究热点网络体系初步形成,集中于战争纪念碑/馆、身份、地方、集体记忆、国家认同等相关领域.通过刻画国外战争纪念性景观研究知识图谱,有望为国内战争纪念性景观研究提供可借鉴的对比性成果.展开更多
文摘Inspired by the movement of duck that is able to move on land and water utilizing its webbed feet, a novel design of an amphibious robot has been presented in this paper. In contrary, the orthodox design of amphibious robot utilizes the tracks or wheels on land and switches to the propeller to move in water. The proposed design employs same propulsion system as webbed feet to move on land and water. After studying the movement of the duck underwater, a conclusion has been drawn that it is swimming in the water by moving its webbed feet back and forth to generate force to push its body forward. Recreating this phenomenon of duck movement, hybrid robot locomotion has been designed and developed which is able to walk, swim and climb steps using the same propulsion system. Moreover, webbed feet would be able to walk efficiently on muddy, icy or sandy terrain due to uneven distribution of robot weight on the feet. To be able to justify the feasibility of the design, simulations are being carried out using SimulationXpress of the SOLIDWORKS software.
文摘以Web of Science核心合集为数据检索平台,选取2010—2022年231篇“战争纪念性景观”为主题的英文文献,采用CiteSpace可视化文献计量软件,绘制知识图谱,揭示国外战争纪念性景观研究现状、热点和前沿.结果表明:国外战争纪念性景观研究经历探索发展阶段(2010—2014年)、稳定发展阶段(2015—2018年)和震荡发展阶段(2019—2022年)三个阶段;作者和机构合作网络结构稀疏,均未建立紧密的联系网络.研究热点网络体系初步形成,集中于战争纪念碑/馆、身份、地方、集体记忆、国家认同等相关领域.通过刻画国外战争纪念性景观研究知识图谱,有望为国内战争纪念性景观研究提供可借鉴的对比性成果.
