能实现垂直缠绕攀爬的蛇形机器人     

孙洪 《苏州市职业大学学报》2020,(2):6-9

垂直缠绕攀爬的蛇形机器人是基于模块化的P_R(pitch_roll)关节,以串行总线舵机作为关节驱动装置,其控制系统采用协调级和执行级配合的二级结构,以空间三连杆组成的蠕动爬行作为基本步态,实现了蛇形机器人具有垂直缠绕攀爬的功能。  相似文献   

The Grand Challenges Discourse: Transforming Identity Work in Science and Science Policy     

David Kaldewey 《Minerva》2018,56(2):161-182

This article analyzes the concept of “grand challenges” as part of a shift in how scientists and policymakers frame and communicate their respective agendas. The history of the grand challenges discourse helps to understand how identity work in science and science policy has been transformed in recent decades. Furthermore, the question is raised whether this discourse is only an indicator, or also a factor in this transformation. Building on conceptual history and historical semantics, the two parts of the article reconstruct two discursive shifts. First, the observation that in scientific communication references to “problems” are increasingly substituted by references to “challenges” indicates a broader cultural trend of how attitudes towards what is problematic have shifted in the last decades. Second, as the grand challenges discourse is rooted in the sphere of sports and competition, it introduces a specific new set of societal values and practices into the spheres of science and technology. The article concludes that this process can be characterized as the sportification of science, which contributes to self-mobilization and, ultimately, to self-optimization of the participating scientists, engineers, and policymakers.  相似文献   

Progress Is Not an Illusion     

Oren Harman 《Science & Education》2018,27(1-2):219-224

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Letters     

Seth Forman 《Academic Questions》2018,31(3):251-251

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Kuhn’s Image of Science     

William Rehg 《Metascience》2018,27(2):213-215

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Disconnect: Kentucky and the Political Ideology of its Public Universities     

Ben Foster 《Academic Questions》2018,31(3):313-321

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The Evolution of U.S. Museums and Science Centers as Informal Learning Environments     

Renee M. Clary 《Science & Education》2018,27(3-4):371-377

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The Historical Heart of Atmospheric Science     

Anthony J. Sadar 《Science & Education》2018,27(1-2):233-235

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欧洲阅读联盟(EURead)推广阅读活动与启示     

吴汉华  倪弘 《图书情报工作》2019,63(13):114-121

[目的/意义]欧洲阅读联盟是欧洲社会力量开展阅读活动的母平台，联盟成员所开展的阅读活动既有差异，也有共性，社会影响力大。通过对欧洲阅读联盟成员所办阅读活动及其规律的分析，可为我国公共图书馆主导与开展阅读活动提供借鉴。[方法/过程]概述欧洲阅读联盟，对其成员类型进行解析，并对每一成员的阅读项目进行共性分析，凝练出阅读活动的经验及规律。[结果/结论]我国应建立多级阅读推广力量，建立政府购买阅读服务长效机制，开放图书馆的阅读活动空间，提升阅读活动频率，开发多样化、差异化的阅读活动。  相似文献   

气膜厚度对反气泡稳定性的影响     

安骥  何随龙  王鑫  陈磊  李根  郑洪 《上海海事大学学报》2020,41(1):111-115

为观察气膜厚度对反气泡稳定性的影响,通过加热反气泡内外溶液来加热气膜内气体从而改变气膜厚度。实验发现:在一定温度范围内,加热反气泡气膜可以延长其稳定时间,但是当加热反气泡气膜使其厚度超过其稳定存在的阈值时,反气泡的稳定性会急剧下降甚至无法产生反气泡;在一定温度范围内温度对溶液表面张力影响很小,这使得文中实验数据合理化。本文为反气泡稳定性的理论研究提供实验支持,并考虑到气膜厚度为微米级,可为微米级气膜传热提供实验素材。  相似文献