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A statistical approach to evaluate the subjective perception of the annoyance caused by the vehicle noise was presented in this paper. After recording the noises of Sanfeng, Huali and Xiali at speeds of 30, 40, 50, 60, 70 and 80 km/h respectively, the annoyance of the vehicle noises was evaluated in the testing room using paired comparison method, and the sound quality metrics and subjective annoyance were then distilled. Loudness, sharpness, roughness, periodicity and impulsiveness were selected for each of the vehicle noises. By correlation analysis method, it can be found that loudness has a higher correlation (0.91) with annoyance than other parameters. Meanwhile, sharpness, periodicity, roughness and impulsiveness have correlation with subjective perception with correlation coefficients being 0.84,-0.82, 0.62 and 0.87, respectively. The result of multiple regression analysis shows that calculated annoyance obtained by the regression equation can explain the perceptual annoyance and the regressed evaluation model is feasible to evaluate the sound quality of vehicle. 相似文献
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公办高校与民办高校党建工作结对共建,既是一种基层党建活动的创新方式,也是全面推进高校基层党组织建设的具体举措。公办高校与民办高校党建工作结对共建,必须强化领导,明确职责任务,搭好共建平台,健全长效机制,着力抓好落实,推动整体提升。 相似文献
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综自变电站RS-485通信防雷技术应用 总被引：1，自引：0，他引：1
在采用双绞线作传输线构成RS-485总线网络中,常因雷电瞬变干扰而损坏器件,根据黄山地区雷暴日多的特点,结合公司变电站综合自动化系统RS-485数据通信防雷薄弱的现状,利用最新的数据通信防雷技术提出对变电站综合自动化系统数据通信实行整体的安全防护。 相似文献
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Subject-specific self-efficacy is a measure of confidence in one’s own ability to complete tasks related to that subject. This confidence does not necessarily reflect actual ability in the subject and can be an over- or underestimate of true ability. We use nationally representative samples of 15-year-old students from the US to measure the degree of over-/under-confidence in mathematics and science, and explore its relationship with student demographic characteristics such as gender, grade and race. Our results suggest that white students consistently underestimate their ability, whereas black and Hispanic students consistently overestimate it. This pattern in over-/under-confidence persists even after controlling for student and school level differences. Implications are discussed. 相似文献
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Sandra A. Butvilofsky Susan Hopewell Kathy Escamilla Wendy Sparrow 《Journal of Latinos & Education》2017,16(2):85-97
The purpose of this single-subject longitudinal study was to examine the Spanish and English biliterate development of U.S. Latino Spanish/English speaking students, who we call emerging bilingual students, as they participated in an innovative biliteracy instructional program titled Literacy Squared®. Findings indicate that across the three years of the study, participating students made gains in Spanish and English reading and writing. This study provides support for Literacy Squared as an innovative biliterate program. Further, the study provides evidence for the need to consider alternative methods to document Latino Spanish/English students’ biliteracy development such as through the use of biliterate trajectories. 相似文献
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冯美娜 《宁波大学学报(教育科学版)》2015,(2):16-20
研究对比分析了中国英语学习者在不同分组情况下同伴反馈活动的过程和效果。数据来自于某三本院校英语专业一年级四个平行班中120名学生的写作文本及随访记录。调查发现同伴反馈对各个小组学生的写作能力总体上都产生积极影响,但小组内部成员的语言水平及结对方式影响同伴反馈的效果。综合考虑反馈质量、有效采纳数量及写作文本提高分数等因素,高低配对组是同伴反馈的最大受益者,依次是高高组、低低组,而低高组的反馈效果最不理想。 相似文献
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胡国权 《中山大学学报论丛》1997,(5)
用双代数２－上循环扭曲其余乘积引入广义余量子偶，给出Ｄｒｉｎｆｅｌｄ量子偶之对偶的余乘积的简单描述和拟三角双代数的结构性质． 相似文献
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C.C.Kuhlthau以建构主义理论为基础提出了著名的信息搜索六步骤(被称作Kuhlthau模式信息搜索行为模型)。文章基于Kuhlthau搜索行为模型,设计出了以用户搜索行为为导向的信息检索课教学模式,并付诸教学实践;根据设计实施的检索课教学实践中收集的数据和信息,利用SPSS统计软件对以用户搜索行为为导向的信息检索课教学的实施效果进行配对样本T检验分析和评价。 相似文献
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The Tukey mean‐difference plot, also called the Bland–Altman plot, is a recognized graphical tool in the exploration of biometrical data. We show that this technique deserves a place on an introductory statistics course by encouraging students to think about the kind of graph they wish to create, rather than just creating the default graph for the variables types they have. This graphical technique is described, and two examples are presented: one dealing with official agricultural data of Poland and the other one with an experiment on anorexia. Our opinion is that the plot is so easy and yet efficient in visualizing paired data that it should be included in statistics courses to support understanding and interpretation of data and their analysis. © 2014 The Authors. Teaching Statistics © 2014 Teaching Statistics Trust 相似文献