基于ICWGT和灰色关联分析法的起重机安全评价     

肖汉斌  熊楚宸  祝锋  刘敏 《上海海事大学学报》2020,41(2):117-122

针对目前起重机安全评价过于依赖主观权重且忽视起重机安全状态变化趋势的问题，建立基于改进博弈论组合赋权法（improved combination weighting method of game theory，ICWGT）和灰色关联分析法的起重机安全评价体系。在该评价体系中，收集样本数据以确定评价值，构建评价等级空间来计算起重机行为特征序列与标准行为特征序列的关联系数。运用ICWGT在层次分析法和信息熵 未确知测度理论确定的主、客观权重中寻找平衡。充分考虑专家经验和样本数据，确定优化权重以改善关联系数的分配问题，从而获取起重机灰色关联度评价值和安全等级，旨在对起重机安全状态变化趋势进行更加准确的定量描述和定性分析。实例分析验证了该评价体系的有效性。  相似文献   

Bio-inspired untethered fully soft robots in liquid actuated by induced energy gradients     

Liang Xiong Lyu  Fen Li  Kang Wu  Pan Deng  Seung Hee Jeong  Zhigang Wu  Han Ding 《国家科学评论(英文版)》2019,6(5):970

Soft robotics with new designs, fabrication technologies and control strategies inspired by nature have been totally changing our view on robotics. To fully exploit their potential in practical applications, untethered designs are preferred in implementation. However, hindered by the limited thermal/mechanical performance of soft materials, it has been always challenging for researchers to implement untethered solutions, which generally involve rigid forms of high energy-density power sources or high energy-density processes. A number of insects in nature, such as rove beetles, can gain a burst of kinetic energy from the induced surface-energy gradient on water to return to their familiar habitats, which is generally known as Marangoni propulsion. Inspired by such a behavior, we report the agile untethered mobility of a fully soft robot in liquid based on induced energy gradients and also develop corresponding fabrication and maneuvering strategies. The robot can reach a speed of 5.5 body lengths per second, which is 7-fold more than the best reported, 0.69 (body length per second), in the previous work on untethered soft robots in liquid by far. Further controlling the robots, we demonstrate a soft-robot swarm that can approach a target simultaneously to assure a hit with high accuracy. Without employing any high energy-density power sources or processes, our robot exhibits many attractive merits, such as quietness, no mechanical wear, no thermal fatigue, invisibility and ease of robot fabrication, which may potentially impact many fields in the future.  相似文献   

Communicating citizenship in China’s digital society     

Bingjuan Xiong 《Journal of International and Intercultural Communication》2019,12(2):128-145

ABSTRACT

This research explores the (inter-) cultural dimension of communicating citizenship in China’s new media environment. It adopts speech codes theory as a theoretical and methodological framework to examine the historically situated and socially constructed meanings of citizenship and the normative communicative conduct for practicing “good citizenship” in China. Through a systematic analysis of Chinese online discourse surrounding two social events, this study captures one speech code pertaining to communicating citizenship that is premised on a paradox – citizenship is interpreted by the Chinese as a legal entitlement that they deserve, but it is simultaneously treated as an aspirational and unattainable ideal. Additionally, speaking sensibly and morally with a communal orientation is heavily emphasized in this speech code as it is considered a valuable communicative practice for performing “good citizenship.” Finally, participating in online collective actions such as “topping posts” is rendered an acceptable and effective way to communicate and enact citizen rights in China.  相似文献   

以企业主导的校企合作大学本科毕业设计培养模式     

张凌峰  文九巴  任凤章  熊毅  张毅 《中国现代教育装备》2011,(19):106-107,110

为改变传统的单一模式对学生的束缚,加强产学研合作,提高学生毕业设计的主动性,更好地培养动手和实践能力强的高级应用型专业人才以满足现代社会的需求。探讨指导本科毕业设计（论文）多元化的新途径,试行＂以企业为主导的校企合作指导本科毕业设计（论文）培养模式＂,以期突破现今指导本科毕业设计（论文）的固定模式,以更好地培养学生的能动性,同时也为学生了解企业和为今后就业创造机会。  相似文献   

医学高校实验室开放管理模式探析     

张威  黄泳  熊梦辉  朱飞燕  童峥 《中国现代教育装备》2011,(7):85-86

分析了目前医学高校实验室开放管理模式存在的主要问题,阐述了革新实验教学模式是提高实验教学质量培养高素质创新型人才的根本途径,提出了建立实验室开放新的管理模式方法和手段。  相似文献   

The role of community college counselors as validating agents on men of color student success     

Soua Xiong  Cory Allen  J. Luke Wood 《Community College Journal of Research & Practice》2016,40(6):558-561

The purpose of this study was to explore the role of counselors in providing validation for men of color in community colleges. Through protocol writing, 13 counselors from seven community colleges responded to open-ended questions asking them to reflect and describe strategies they employed when advising and counseling men of color. Thematic analysis using a combination of detailed, selective, and wholistic reading approaches, as described by van Manen (1990), was employed to identify themes reflecting different forms of validation. Findings from this study demonstrate the critical role of community college counselors as validating agents in affirming men of color as being capable of college success, helping them build confidence, affirming them as individuals, and providing opportunities for academic and personal development. Implications for practice are discussed.  相似文献   

基于Oracle Spatial的空间查询技术及其优化     

熊雷 《教育技术导刊》2008,7(8):7-9

从Oracle Spatial的空间查询分析出发,结合实例分析了它的查询模型、空间算子以及常用的空间函数,最后给出了Oracle Spatial中空间查询的优化建议。  相似文献   

Optimization of conditions for supercritical fluid extraction of flavonoids from hops (Humulus lupulus L.)     

He GQ  Xiong HP  Chen QH  Ruan H  Wang ZY  Traoré L 《Journal of Zhejiang University. Science. B》2005,6(10):999-1004

Waste hops are good sources of flavonoids. Extraction of flavonoids from waste hops (SC-CO₂ extracted hops) using supercritical fluids technology was investigated. Various temperatures, pressures and concentrations of ethanol (modifier) and the ratio (w/w) of solvent to material were tested in this study. The results of single factor and orthogonal experiments showed that at 50°C, 25 MPa, the ratio of solvent to material (50%), ethanol concentration (80%) resulted in maximum extraction yield flavonoids (7.8 mg/g). HPLC-MS analysis of the extracts indicated that flavonoids obtained were xanthohumol, the principal prenylflavonoid in hops. Project (No. Y304203) supported by the Natural Science Foundation of Zhejiang Province, China  相似文献   

初中体育多样化教学改革的实践探索     

张雄 《天津教育》2021,(6):8-9

在教育改革背景下,初中体育教师的教学理念发生了根本性变化,不仅注重学生体育运动能力的锻炼,更加注重学生体育素养的培养。改变了传统的体育教学模式,教学目标向多元化方向发展,教学内容也逐渐丰富,更加注重学生的个性发展,根据学生身体素质制订有针对性的教学计划。本文重点论述初中体育多样化教学改革的具体实践路径,提升初中体育教学有效性。  相似文献   

高校创业教育教师胜任力的多维结构模型及其改进策略——基于全国1231所高校的实证研究     

王志强  熊顺顺  龙泽海 《教育发展研究》2021,41(3):77-84

教师胜任力是教师从事创业教育需要具备的差异化特征总和.基于文献分析,本文提出了高校教师在创业教育中应具备的特征和能力,设计了高校教师创业教育胜任力特征的调查问卷;经过探索性因素分析,运用结构方程构建了二阶四维高校创业教育教师胜任力模型;将专业与课程建设、知识技能、能力发展、创业资源变为内因潜在变量,外因潜在变量为高阶因素,构建“创业教育教师胜任力多维结构模型”,提出了促进高校创业教育教师胜任力的相关建议.  相似文献