用Excel处理化学中的计算问题

利用Excel处理化学中算术平均值、平均偏差、相对平均偏差、标准偏差、相对标准偏差、物质的量浓度、溶液的H+浓度、溶液的pH值、缓冲溶液等一些常见的数据处理和计算问题。     

Explaining match outcome in elite Australian Rules football using team performance indicators

The relationships between team performance indicators and match outcome have been examined in many team sports, however are limited in Australian Rules football. Using data from the 2013 and 2014 Australian Football League (AFL) regular seasons, this study assessed the ability of commonly reported discrete team performance indicators presented in their relative form (standardised against their opposition for a given match) to explain match outcome (Win/Loss). Logistic regression and decision tree (chi-squared automatic interaction detection (CHAID)) analyses both revealed relative differences between opposing teams for “kicks” and “goal conversion” as the most influential in explaining match outcome, with two models achieving 88.3% and 89.8% classification accuracies, respectively. Models incorporating a smaller performance indicator set displayed a slightly reduced ability to explain match outcome (81.0% and 81.5% for logistic regression and CHAID, respectively). However, both were fit to 2014 data with reduced error in comparison to the full models. Despite performance similarities across the two analysis approaches, the CHAID model revealed multiple winning performance indicator profiles, thereby increasing its comparative feasibility for use in the field. Coaches and analysts may find these results useful in informing strategy and game plan development in Australian Rules football, with the development of team-specific models recommended in future.     

The expected value of possession in professional rugby league match-play

This study estimated the expected point value for starting possessions in different field locations during rugby league match-play and calculated the mean expected points for each subsequent play during the possession. It also examined the origin of tries scored according to the method of gaining possession. Play-by-play data were taken from all 768 regular-season National Rugby League (NRL) matches during 2010–2013. A probabilistic model estimated the expected point outcome based on the net difference in points scored by a team in possession in a given situation. An iterative method was used to approximate the value of each situation based on actual scoring outcomes. Possessions commencing close to the opposition’s goal-line had the highest expected point equity, which decreased as the location of the possession moved towards the team’s own goal-line. Possessions following an opposition error, penalty or goal-line dropout had the highest likelihood of a try being scored on the set subsequent to their occurrence. In contrast, possessions that follow an opposition completed set or a restart were least likely to result in a try. The expected point values framework from our model has applications for informing playing strategy and assessing individual and team performance in professional rugby league.     

Apriori算法在网上考试系统中的应用

在远程教育系统的网上考试系统模块中,数据库和数据仓库中的用户交互数据记录了用户对系统的访问行为信息,利用最小支持度和最小置信度,挖掘出频繁项集,对这些信息的分析有利于远程教育教学管理人员和教师掌握学生对知识的掌握情况,从而可以对教学内容加以改进,对教学平台进行优化.     

具有非期望输出决策单元的有效性评价

针对具有非期望输出决策单元DMU的相对有效性 ,提出对其进行评价的非径向FDEA模型 ,并给出模型的相对有效性理论证明 .结合实际算例 ,指出FDEA模型在实际生产过程中对于节约生产资源 ,提高期望输出 ,降低非期望输出 ,特别是减少环境污染有重要应用价值 .     

基于三坐标测量仪的特征线数据采集方法

阐述了三坐标测量仪数据采集在逆向工程中的重要作用.通过研究三坐标测量仪数据采集的基本原则和路径规划方法,提出了基于三坐标测量仪的特征线数据采集方法,实现了基于三坐标测量仪的简单型面及自由曲面的数据快速采集.     

基于大数据的高职英语写作教学改革探讨

信息技术以及各种移动设备的日益普及将人类带入了全新大数据时代。大数据时代的到来为高职英语写作课程带来了前所未有的机遇和挑战,高职英语教师必须做好充分准备,更新教育教学理念和思维方式,提升信息技术水平,在教学模式、教学方法和写作评价方式等方面进行大胆创新,培养学生自主学习能力,切实提高英语写作水平。     

客户端数据查询网页设计实例

介绍一种采用 Java Script客户端脚本 ,实现数据量不太大的静态数据网上查询的方法 ,给出了网页和脚本程序代码     

应用大数据推进城市社区的治理创新研究——以贵阳市“社会和云”平台为例

贵州省贵阳市在“新型社区·温馨家园”的战略部署下,将全市94个社区全部建成“文明社区”“绿色社区”“平安社区”。贵阳市在社区建设上所取得的成绩,得益于“社会和云”社会治理大数据云平台在助推基层社区治理中所发挥的重要作用。“社会和云”平台通过对基层数据进行信息化、数据化、自流程化、融合化,解决社会治理当中不同程度地存在的底数不清、情况不明、针对性不强、效率不优等问题。其好处在于,第一,打通基层数据通路,社区遇到问题不再通过请示汇报的方式向上级反映,只需通过社区治理平台将问题上传到“社会和云”平台即可,真正实现了“让数据跑路,给社区减负”。第二,通过“一张图+一张表”的实时动态跟踪查询功能,为各级政府开展基层治理提供了“空间可视”。第三,政务数据、社区信息、公共服务在“社会和云”平台上实现全数据融通,为搭建社区治理的多元融合模式提供了必要的保障。     

GPS/GIS车辆监控管理系统中的关键技术

简要论述了车辆监控管理系统的工作原理及通信链路的选择策略，针对一套实用的GPS／GIS车辆监控系统设计方案，详细阐述了系统设计中的关键技术．