高地压软岩地质条件下大功率带式输送机驱动方式的探讨与应用

随着煤炭资源的减少,许多煤矿的开采条件也是越来越复杂,面临着井深地压高软岩等困难,对煤矿的运输带来许多困难。国内现有的煤矿主带式输送机一般都采用工频拖动,较少采用变频器驱动,随着科学技术的发展,变频器以其优秀的软启动特性、较小的设备体积及广泛的适应性,必将成为煤矿带式输送机的一个发展方向。     

Towards a Prediction Model of Learning Performance: Informed by Learning Behavior Big Data Analytics

Using log data of 823 university students collected in two settings: their online learning setting and daily life setting (using campus ID cards for consumption purposes and book-borrowing in the university library), this study created indicators for online learning behavior, early-rising behavior, book-borrowing behavior and learning performance prediction. Five machine learning models were employed to analyze learning performance prediction, with the additional use of Boosting and Bagging to improve the accuracy of the prediction model. The predictability of the proposed model was also compared with that of both the Artificial Neural Network model and the Deep Neural Network model. At the same time, a classification rule set was established by combining decision tree and rule model, and a learning behavior diagnosis model combining decision tree and deep neural network was constructed. Findings showed that multi-scenario behavior performance indicators had strong predictive capabilities while the Deep Neural Network model had the highest prediction accuracy (82%) but was most time-consuming. The model based on the rule set is highly accurate, readable and operable and may be conducive to making accurate teaching interventions and resource recommendations.     

以碘代乙腈控制丙烯酸酯活性自由基聚合研究

研究了以碘代乙腈退化转移剂的丙烯酸醋活性自由基聚合，实验结果表明：在碘代乙腈的存在下控制甲基丙烯酸甲酯（MMA）的聚合，得到的分子量大（1万-10万），而控制丙烯酸甲醋（MA）、丙烯酸乙醇（EA）、醋酸乙烯醋（VAc）得到的分子量较小（〈1万）．实验得出：[IAN]与EAIBN]之比对控制活性自由基聚合有很大的影响，[IAN]与[AIBN]之比为6：1是有效控制聚合的理想浓度．反应温度为60℃时，转化率随时间的增长而增高，分子量随转化率的增高而增大，成线性关系，分子量的分布较窄（〈1．5）．^1H NMR分析表明，在聚合物主链的末端连有碘，说明碘代乙腈在反应中起退化-转移聚合（IDTP）的作用，通过循环往复的碳-碘键的活化，断裂，再形成而得到最终活性的聚合物。     

千兆位以太网技术研究

分析了千兆位以大网的技术基础，研究了它的两项主要技术，并展望了其未来。     

试论无氧阈跑速作为耐力测试指标的必要性及可行性

800 m、1 000 m跑测试是在用一个以无氧代谢供能为主的运动项目评测人的有氧耐力,成绩不能客观反映机体的有氧耐力水平,不能引导学生科学锻炼,还会让受试者承受较大的心理负荷,不利于运动兴趣培养和终生体育生活方式的养成,且在800 m、1 000 m跑测试中频频发生意外。研究认为,可用无氧阈跑速做耐力评测指标,它能确切反映人的有氧耐力水平,引导人们科学锻炼,强度由低到中,安全、简单,可在跑步机或场地上完成。     

上海ATP1000大师赛现场观众满意度的实证分析

基于2009年到2011年上海ATP1000大师赛现场观众满意度数据,运用相关分析、回归分析及结构方程模型等方法,初步建构上海大师赛总体满意度影响因素模型,同时结合现场观众对大师赛各项服务满意度评价的分析,为提高现场观众总体满意度找出了改善重点。结果表明,官方网站信息服务、现场娱乐活动、现场餐饮服务是提高上海大师赛现场观众总体满意度的改善重点。     

CobraNet 音频网络传输技术在广播总控系统中的应用

本文主要介绍cobranet技术和基于此技术开发的cas1000网络音频路由系统在广播总控系统中的应用.     

Golden Handcuffs in the Fortune 1000? An Employee-Organization Relationship Survey of Public Relations Executives and Practitioners in the Largest Companies

This study delivered an employee-organization relationship survey to public relations executives and practitioners in Fortune 1000 companies. Almost two-thirds (64.3%) were the top-ranking public relations executives in their organizations, and most (79.2%) were paid $100,000 or more. Respondents had significantly higher scores on a majority (66.7%) of relationship outcome measures than did Millennials who worked for public relations agencies. The researcher found a statistically significant difference between salary categories at or above $100,000 and those below $100,000 on the combined dependent variables of trust, control mutuality, commitment, and satisfaction using a one-way between-groups multivariate analysis of variance: F(1, 50) = 4.586, p = .003; Wilks’ Lambda = .71; partial η² = .29. Results may be explained by age and workplace variables and/or the higher compensation and benefits embodied in the concept of the Golden Handcuffs. Results also suggest that relationship-type scales are not reliable.     

基于学科规范引文影响力与同行评议相关性的科学评价实证研究

[目的/意义]分析学科规范引文影响力在科学评价中的可行性及其与同行评议的相关性,为负责任计量及以其为支撑的同行评议提供借鉴。[方法/过程]选取F1000以及InCites平台,将29 850篇细胞生物学文献、30 326篇生物技术文献的CNCI （学科规范化引文影响力）与被引频次进行相关分析,对其中956篇细胞生物学论文的CNCI与F1000分值进行斯皮尔曼相关系数检验。[结果/结论]研究结果表明,从统计学视角看CNCI与被引频次呈高度正相关,与F1000分值呈显著正相关,同时亦存在二者相悖的情形。因此,CNCI在一定程度上能够反映同行评议结果、能代偿实施学术影响力归誉的功能,并适用于跨学科比较;但同行评议或CNCI单独作为科学评价标准都会有失偏颇,以CNCI为代表的新一代负责任计量指标为支撑的同行评议将成为未来科学评价的主流。     

对《学生体质健康标准》中大学生1000M/800M跑、立定跳远评价标准的研究

南昌大学2002级(大二)本科学生作为研究对象，采用数理统计，文献资料和比较分析法，对《学生体质健康标准》中大学生1000m／800m跑、立定跳远的评价标准进行研究分析，发现其评价标准存在不合理之处。对此，本文另制定一种为改善目前大学生体质下降，且较实际的评价标准，供有关决策部门参考。