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The aim of this study was to investigate whether physical or virtual manipulative experimentation can differentiate physics learning. There were four experimental conditions, namely Physical Manipulative Experimentation (PME), Virtual Manipulative Experimentation (VME), and two sequential combinations of PME and VME, as well as a control condition (i.e., traditional instruction with absence of PME or VME). Undergraduate students' understanding of physics concepts in the domain of heat and temperature was tested in a pre- and posttest design that involved 182 participants assigned to the four experimental groups and 52 participants assigned to the control group. Conceptual tests were administered to assess students' understanding before, during and after instruction. The analyses revealed that the four experimental conditions were equally effective in promoting students' understanding of concepts in the domain of heat and temperature and better than the control condition; hence, manipulation, either physical or virtual manipulation, and not physicality, as such, at least in a context like the one of the present study, is important in physics learning. 相似文献
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本文以Proteus软件为基础,在Proteus软件与Keil整合构建的单片机虚拟仿真环境下,检测节气门的信号,通过电子控制单元的计算,输出给步进电机的驱动芯片,根据步距角计算出脉冲数,完成对步进电机的驱动控制,从而实现节气门迅速地获得预期的开度。文章在对电子节气门控制系统仿真的基础上,进行了实物实验,获得较好的效果。 相似文献
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John P. Helveston Yanmin Wang Valerie J. Karplus Erica R.H. Fuchs 《Research Policy》2019,48(1):206-222
A vast literature on technology transitions within industries suggests that early phases of new technologies are marked by periods of intense experimentation, but we know little about the conditions under which these periods emerge. We apply inductive, grounded theory-building techniques to examine what prompts firms to experiment across one emerging technology platform—plug-in electric vehicles (PEVs)—in China. Triangulating annual vehicle make and model sales data from 2003 to 2016 (plus monthly data from 2010 to 2016); 112 English and Mandarin archival documents from industry, academic, and news outlets; and 51 semi-structured interviews with industry, government, and academic stakeholders, we develop four in-depth case studies. We find that in contrast to the innovation trajectories of multinational and Chinese arms of joint venture (JV) firms, independent domestic Chinese firms (those with no history of international JV partnerships) are undertaking significant experimentation across multiple levels—infrastructure, core system, subsystem, and component—of the emerging PEV technology platform. We propose the concept of “institutional complementarities” to describe how interactions among institutions—here the national JV regulation and local market support and subsidies—may have turned regional markets into protected laboratories, extending the incubation periods for independent domestic firm experimentation. While this diverse experimentation may be an important antecedent of technology transition, consolidation induced by national policy standardization or competitive pressure may be required for PEV innovations to scale beyond their early, protected regional markets. 相似文献
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Experimentation and Innovation in U.S. Publishing Today: Findings from the Book Industry Study Group
Michael Healy 《Publishing Research Quarterly》2008,24(4):233-239
In February 2008 the Book Industry Study Group (BISG) conducted a survey of U.S. publishers to determine the extent of technology-driven
innovation and experimentation. The survey findings were published alongside a set of 10 case studies in May 2008 as “From
experimentation to innovation in the digital age—case studies from the North American Book Industry 2008”. This article, written
by Michael Healy, Executive Director of the BISG, summarizes the circumstances that led to the survey and shares the key findings. 相似文献
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Measuring effectiveness of information retrieval (IR) systems is essential for research and development and for monitoring search quality in dynamic environments. In this study, we employ new methods for automatic ranking of retrieval systems. In these methods, we merge the retrieval results of multiple systems using various data fusion algorithms, use the top-ranked documents in the merged result as the “(pseudo) relevant documents,” and employ these documents to evaluate and rank the systems. Experiments using Text REtrieval Conference (TREC) data provide statistically significant strong correlations with human-based assessments of the same systems. We hypothesize that the selection of systems that would return documents different from the majority could eliminate the ordinary systems from data fusion and provide better discrimination among the documents and systems. This could improve the effectiveness of automatic ranking. Based on this intuition, we introduce a new method for the selection of systems to be used for data fusion. For this purpose, we use the bias concept that measures the deviation of a system from the norm or majority and employ the systems with higher bias in the data fusion process. This approach provides even higher correlations with the human-based results. We demonstrate that our approach outperforms the previously proposed automatic ranking methods. 相似文献
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本文从地理模拟实验的内涵特点入手,分析了中学地理教学中运用模拟实验的必要性,分析、总结了中学地理教学中地理模拟实验应当遵循的原则,并且对中学地理模拟实验的类型加以分析。 相似文献
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安文霞 《广东教育学院学报》2011,(2):19-25
刑事实证学派与刑事古典学派的基础理论并不总是处于对立状态,刑事实证学派理论产生的原因体现出两种理论的共生性;理论研究目的的一致性又决定了两种理论并行存在的可能性;两大学派的个人本位与社会本位价值观的双重属性而非单一性与犯罪学、刑法学科的交融而非绝对排斥的理论内涵再次验证了其统一的一面。 相似文献
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本文通过对小型装配式冷库实验、实训设施建设与改造的必要性与教学用途、技术与经济可行性分析、基本建设与改造方案内容等三个方面的讨论,认为小型装配式冷库实验、实训设施价格低廉、教学用途广泛、建设简单、维护方便、技术改造可选择的项目与内容很多,可以提供多专业多课程的专业实验实训任务,是一种很理想的、很有必要的高职制冷与空调专业实验、实训设施。 相似文献
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