日本体力测量的改革

对20世纪末日本的体力测量改革的背景、目的和改革后的新体力测量方案的构成和特点进行了分析,结合我国体质测量中存在的问题,指出可以借鉴日本的经验和研究成果,加强体质测量的基础研究,提高体质测量的质量。     

单片机控制的起爆器

采用单片机所研制开发的程控多功能起爆器主要由主机、执行机构两大部分组成。主机与执行机构之间用100m通讯线连接。执行机构可连接多达56路起爆线路。其具有控制范围广,功能全,精度高,安全性好、抗干扰能力强等特点。     

从结果出发的法律解释

在司法实践中,当法官在裁判案件时,他们的逻辑思维是什么？他们是否严格依据逻辑三段论而作出判决？法律解释在其中充当了什么作用,其地位如何？利益衡量有必要吗？本文主要从这几个方面来进行论述。     

精确汽包水位测量加强汽包水位保护

分析汽包水位测量误差的原因和保护存在的问题,提出了解决方法,以提高汽包水位测量准确性,加强汽包水位保护可靠性。     

基于RITE测度的降维方法研究

在RITE的框架下,考察了社会信息化指标体系中不同指标的增长特征及其在测算中的表现,提出了一种基于RITE测度的降维方法——指标增长特征降维法的实现思路。文章结合案例,通过指标抽取试验,对所提出的方法进行了实证研究。     

公允价值计量的利弊分析

认识了公允价值的涵义及基本特征,分析了公允价值计量的利弊,在此基础上提出了克服弊端,发挥优越性的举措。公允价值计量的优越性表现为:适应金融创新的需要;使会计收益更加真实、全面;有利于企业的资本保全;更加符合配比原则的要求;提高信息的决策有用性。公允价值计量的不足之处在于:公允价值确定的主观性较强;可操作性较差;容易导致利润操纵;信息成本较高。基于此认识,提出克服弊端,发挥优越性的两点举措:普及公允价值计量观念和计量的专门技能;尽快完善与公允价值相适应的市场环境。     

基于网络问答社区的话题识别与分析——以知乎“老年人”话题为例

[目的/意义]针对目前基于网络的话题识别与分析方法的局限性,提出针对网络问答社区的话题识别与分析方法,为此类网站的话题识别与分析提供参考。[方法/过程]以改进的中文分词技术为基础,构建网络问答社区的话题识别指标,通过线性加权方式计算权重,结合关键词提取方法确定话题关键词,对话题关注焦点进行提取,对分布情况进行测度。依据所提出的改进方法,以知乎网站为数据来源,从话题关键词、关键词分布以及热点子话题3个角度对"老年人"话题焦点进行识别与分析。[结果/结论]研究表明,该方法具有科学性和可行性,不仅拓展了社会问题的分析数据源,也为"积极开展应对人口老龄化行动"提供了决策依据。     

Helical angle measurement of worm by a coordinate measuring machine and its uncertainty evaluation

The purpose of the study concerns the measurement of worm’s helical angle by a coordinate measurement machine in the ambient industrial environment. The novel measurement method and sampling strategy were described firstly. This method used the coordinate measurement machine to measure both of the worm gear’s left and right surfaces. The worm surface was reconstructed based on the measured data of all the sampling points. Then a middle cylinder was established to truncate the fitted worm surfaces, and the truncated spiral lines were straightened to calculate the helical angle. The measurement uncertainty of worm’s helical angle was evaluated by taking the difference of calculated helical angles along the truncated spiral lines on both the left and right side surfaces of the worm. Twenty-four measurement experiments show that the maximum measurement error of the proposed method is 0.105, and the measurement error ratios are all less than 3.5?. The result means that the measurement method can realize the precision measurement of worm’s helical angle and can be employed in the generally industrial application.     

一种凸轮升程误差的非接触式测量新方法

分析现有几种凸轮升程误差测量方法的优、缺点后，提出一种基于图像处理的凸轮升程误差的非接触式测量新方法．理论分析和比较实验结果表明，该测量方法简便易行，测量精度较高，具有一定的应用价值．     

Accelerometer data requirements for reliable estimation of habitual physical activity and sedentary time of children during the early years - a worked example following a stepped approach

This study presents a worked example of a stepped process to reliably estimate the habitual physical activity and sedentary time of a sample of young children. A total of 299 children (2.9 ± 0.6 years) were recruited. Outcome variables were daily minutes of total physical activity, sedentary time, moderate to vigorous physical activity and proportional values of each variable. In total, 282 (94%) provided 3 h of accelerometer data on ≥1 day and were included in a 6-step process: Step-1: determine minimum wear-time; Step-2: process 7-day-data; Step-3: determine the inclusion of a weekend day; Step-4: examine day-to-day variability; Step-5: calculate single day intraclass correlation (ICC) (2,1); Step-6: calculate number of days required to reach reliability. Following the process the results were, Step-1: 6 h was estimated as minimum wear-time of a standard day. Step-2: 98 (32%) children had ≥6 h wear on 7 days. Step-3: no differences were found between weekdays and weekend days (P ≥ 0.05). Step-4: no differences were found between day-to-day variability (P ≥ 0.05). Step-5: single day ICC’s (2,1) ranged from 0.48 (total physical activity and sedentary time) to 0.53 (proportion of moderate to vigorous physical activity). Step-6: to reach reliability (ICC = 0.7), 3 days were required for all outcomes. In conclusion following a 7 day wear protocol, ≥6 h on any 3 days was found to have acceptable reliability. The stepped-process offers researchers a method to derive sample-specific wear-time criterion.