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《Measurement》2016
The goal of the current study is to evaluate psychometric properties of the Distraction Scale based on 866 teachers. Our findings from confirmatory factor analyses (CFA) supported the existence of two separate, yet related subscales for the Distraction Scale: conventional distraction and tech-related distraction. Regarding the concurrent validity evidence of the Distraction Scale, results indicated that, in line with theoretical expectations, these two subscales were positively related to avoidance and performance goal orientations. Furthermore, these two subscales were negatively associated with mastery goal orientation, interest in learning and using information technology, expectancy belief, and value belief. 相似文献
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《Measurement》2016
The aim of the present investigation is to validate the Teacher Homework Involvement Scale (THIS) based on the data from 918 secondary school students. Using a randomized split of the sample, we performed exploratory factor analysis (EFA) on Group 1 (n = 459) and confirmatory factor analysis (CFA) on Group 2 (n = 459). The results indicated that the THIS consisted of three distinct yet related subscales: Homework Quality, Feedback Quality, and Autonomy Support. In addition, the present investigation found an adequate level of factor loading invariance across gender. Results further revealed that, in line with theoretical expectations, the THIS were positively related to motivational belief (value belief and expectancy belief), homework behavior (effort, management, and completion), and math achievement. 相似文献
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This paper describes the initial psychometric evaluation of the Homework Purpose Scale (HPS), taking an illustration form practice in one country where it is used. The Homework Purpose Scale was designed to measure homework purpose. Both exploratory and confirmatory factor analyses were performed on samples of undergraduate students (N = 443). Results showed that the factor structure of the Turkish version of the HPS (where the study was carried out) was largely similar to the original one in the US. Moreover, each subscale demonstrated high internal consistency, and as predicted was correlated with theoretically related homework measures and other relevant constructs, along with displaying temporal stability. In brief, initial results indicate that the version of the HPS used here is a reliable and valid multidimensional measure for determining homework purpose. 相似文献
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基于工作过程导向的《计量器具使用与维护》课程教学改革研究 总被引:1,自引:0,他引:1
《计量器具使用与维护》是职业技术学院机械质量检测与管理专业学生必修的职业技能课程。依据工作过程这一先进的课程改革思想,结合这个专业的岗位技能需要,对课程的内容进行解析与重构后设计了七个学习情境,并对教学方法和考核方式进行了改革。 相似文献
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绞车是空中收放拖耙的核心设备,内部有一个高速旋转的卷筒用来缠绕缆绳,对卷筒可靠的刹车是绞车正常工作的基础.从拖耙系统的工作概况开始,介绍了传动、刹车部分的结构原理,运用力学知识,较详细计算分析了系统载荷,得到了可接受的结果,给出了具有使用价值的结论. 相似文献
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随着科技革命快速发展,人工智能已经渗入到我们生活的各个领域.交通工具革新,自动驾驶技术,智能网联汽车投入运用,人工智能将对于现时代下高校毕业生就业也产生了很大的影响.本文研究探讨人工智能对汽车专业就业的影响及对策研究,分析了当前汽车专业中存在的问题及不足,据此提出针对性的应对策略,协同推动人工智能技术进步与经济增长和高... 相似文献
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笔者通过对柴油机检修、组装、试验过程中的清洁度分析,得出预防柴油机碾瓦事故的有效措施是提高柴油机在检修过程中的清洁度,这是确保柴油机检修质量必须加以控制的项目。 相似文献
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分析滚动轴承系统的寿命与可靠性之间的关系,对滚动轴承系统进行了可靠度的分配;对影响滚动轴承额定寿命的各因素进行讨论,并对滚动轴承额定寿命进行修正。 相似文献
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目前我国的工业化发展进程已经在原有的发展基础上,朝现代化的发展方向进行转变,而且我国的机械制造业在新时代的科技发展影响下,正在向智能化以及数字化的发展模式进行转变,为了使机械产业可以完全实现数字化以及智能化,有关的技术人员正在不断地进行技术创新.本文针对现代机械设计制造行业的整体发展概况进行分析,同时对其智能化的发展方... 相似文献
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根据大连交通大学连续挤压生产线的实际需要,设计出适合收取连续挤压产品的收排线设备。基于TLJ300型连续挤压机的设备参数以及生产能力制定出收排线机的技术参数,基于TLJ300型连续挤压机的产品特点制定收排线设备的收排线机构. 相似文献
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The paper examines briefly the state of the art of intelligent measurement on the basis of the proceedings of the IMEKO 1986 Symposium on the subject. It identifies advances in computer-assisted measurement, data conditioning, measurement process control, measurement result output, and measurement data processing as well as application of machine intelligence to measurement interpretation and use in decision support. It identifies the latter as a significant area of future progress. Applications of intelligent measurement in laboratory automation, electrical measurement, mechanical manufacture and associated inspection and clinical medicine are highlighted. 相似文献
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针对航空发动机主轴与轴承内圈发生相对转动,两者配合表面出现严重磨损的故障。首先用理论方法和有限元法分别计算了轴承内圈与主轴配合表面的接触压力,然后分析了轴向预紧载荷、工作温度、主轴转速三种因素对该接触压力的影响。发现:轴承内圈与主轴过盈配合安装时配合表面的接触压力分布不均匀,边缘处出现峰值,理论解略偏于安全;轴向预紧载荷对轴承内圈与轴配合表面的接触压力的分布和数值影响不大;工作温度和转速对轴承内圈与主轴配合表面的接触压力均有显著的影响,接触压力随着温度升高和转速增加而下降;如果不考虑轴系所受外载荷轴承内圈与主轴配合表面的接触压力可能会降低为0。该研究对于设计主轴轴承的装配过盈量具有一定的指导意义。 相似文献
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车齿工艺是一种高效齿轮切削加工工艺,刀具工作角度是影响切削加工性能的重要参量。车齿工艺由于运动关系和刀具几何形状复杂,导致刀具工作角度在切削过程中不断变化,并受多因素影响。首先基于车齿工艺原理和坐标变换方法建立其运动学模型,并根据车齿刀几何构型建立产形后刀面、前刀面和切削刃的数学模型,结合斜角切削的刀具工作角度定义推导出车齿刀工作前角和后角的计算公式,实现车齿刀工作角度演变过程的解析表示,最后分析了车齿刀设计前角和螺旋角对工作角度的影响。结果表明较大的刀具设计前角主要影响工作前角,而车齿刀螺旋角主要影响工作后角。相关结果可以为刀具结构优化提供理论支撑。 相似文献
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分级组合式神经网络诊断系统研究 总被引:1,自引:0,他引:1
张小栋 《振动、测试与诊断》1999,19(2):111-117
简要介绍了一个新的机械故障诊断模型——模糊神经网络诊断模型。将之应用于大型旋转机械故障诊断中,基于分级策略,创立了分级组合式神经网络诊断系统,并对其主要功能做了较详尽的论述。通过理论和应用分析,指出了这个新系统的优越性。 相似文献