Dynamic reciprocal relations of achievement goals with daily experiences of academic success and failure: An ambulatory assessment study

Achievement goals have been linked to achievement in various educational settings. The present work explored day-to-day variations in achievement goals (mastery, performance-approach, performance-avoidance) and their associations with daily experiences of academic success and failure. Ambulatory assessment data from 108 students in Grade 5 were collected, with daily assessments of achievement goals in the morning and end-of-day reports of academic success and failure. Dynamic structural equation models revealed reciprocal within-person effects between mastery goals and academic success. Academic success was further associated with higher mastery and performance-approach goals in the next morning. Academic failure was linked to both performance goals, though this association was not robust in all sensitivity analyses. Higher average daily academic success and lower average academic failure were linked to better academic achievement one year later. Findings suggest meaningful within-person dynamics among goals and daily academic success and failure.     

论高校声乐专业学生课后自主练习的重要性和可行性

加强声乐专业学生课后练习,能让他们在舞台上收放自如,能加深老师对学生声音的认识,能弥补和完善课堂教学的不足.但是,声乐专业学生在课后自主练习时,练习时间,练习形式,练习方法等三方面都存在问题,我们在针对这些问题提出解决办法的同时,要求声乐专业的学生要正确认识自己,自我激励,并且减少对老师和对伴奏的依赖,才能让他们的课后自主练习达到事半功倍的效果.     

FIR数字滤波器的设计与仿真

为了减小数字滤波器设计工作量,利用MATLAB软件,采用窗函数法、频率采样法及最优等波纹法设计FIR数字滤波器.通过比较不同设计方法得到的滤波器阶数以及幅频特性曲线,结果表明,最优等波纹法可大大减少了计算的复杂程度,所设计的滤波器简单,是FIR滤波器设计中的最优方法.     

港口吞吐量抽样调查方案设计

讨论了抽样调查在港口吞吐量调查中的应用前景，分析了港口吞吐量抽样调查方案设计的各个环节，包括：方案设计的原则、技术方法、抽样公式、调查时间、分层确定、季节变动处理和非抽样误差控制等。     

Preanalytical phase--a continuous challenge for laboratory professionals

Preanalytical phase is the most vulnerable part of the total testing process and is considered to be among the greatest challenges to the laboratory professionals. However, preanalytical activities, management of unsuitable specimens and reporting policies are not fully standardized, nor harmonized worldwide. Several standards related to blood sampling and sample transportation and handling are available, but compliance to those guidelines is low, especially outside the laboratory and if blood sampling is done without the direct supervision of the laboratory staff. Furthermore, for some most critical procedures within the preanalytical phase, internationally accepted guidelines and recommendations as well as related quality measures are unfortunately unavailable. There is large heterogeneity in the criteria for sample rejection, the different strategies by which unacceptable samples are managed, processed and test results reported worldwide. Management of unacceptable specimens warrants therefore immediate harmonization. Alongside the challenging and long road of patient safety, preanalytical phase offers room for improvement, and Editors at Biochemia Medica Journal definitely hope to continue providing a respective mean for reporting studies on different preanalytical phase topics. With pleasure and delight we invite potential future authors to submit their articles examining the quality of various preanalytical activities to Biochemia Medica. We will keep nurturing this topic as our prominent feature and by this we hope to be able to deliver valid evidence for some future guidelines and recommendations.     

基于改进的IMM目标跟踪算法研究

采用了交互式多模型(IMM)算法进行目标定位跟踪。交互式多模型(IMM)作为一种数据互联算法具有自适应的特点,可以有效地对各个模型的概率进行精细地调整,尤其适用于对机动目标的定位跟踪。实验结果表明,本文提出的算法能够有效地对目标进行定位跟踪。     

美国大学终身聘任后评审制政策的网络调查问卷设计及实施

近十多年来,终身聘任后评审政策在美国掀起了一场运动,引起了广泛关注.但目前国内研究还较少见,尤其定量研究更为缺乏.本文尝试通过网络调查问卷的定量研究来进行.从美国的研究/博士型、硕士型共862所大学总体中,采用分层随机抽样法,抽取公、私立大学共432所为样本,每所大学选择行政官员和教授各1位,直接进行跨国网上问卷调查.本研究表明,采用网络问卷调查法进行外国教育研究是一种成功的研究方式.     

分层抽样下多项选择敏感问题随机抽样调查方法及应用

目的是为多项选择敏感性问题提供科学的、精度更高的随机抽样调查方法及其统计量的计算公式,设计出多项选择敏感问题分层抽样下的随机抽样调查模型,并推导出在此模型下总体比例的估计量及其估计方差的计算公式,计算出敏感属性比例95％的置信区间。并在湖南城市学院本科学生考试作弊情况的实例调查中取得了信誉度较高的应用效果。     

基于MAX125的多通道同步采样数据采集系统

介绍了一种基于MAX125的多通道同步采样数据采集系统.该系统由89C51单片机作为控制核心完成控制功能.文中较详细地介绍了本系统的硬件电路设计和软件设计方法.     

网络组织成员重要度的评价方法

研究成员在网络组织中的贡献的测量问题,以成员重要度来表征网络组织各个成员的贡献,提出一类评价网络组织成员重要度的方法,在此基础上给出重要度评价的修正方法。首先分析网络组织成员重要度的内涵,制定成员重要度评价的原则,利用复杂网络分析方法提出一类网络组织成员重要度的评价方法,最后提出重要度评价的修正建议。该评价方法系统考虑了成员的局部重要性和全局重要性,并可结合影响因素进行调整,因而更为合理且更符合实际。具有评价方法的优良性质和通用分析特征。