Calf massager: Intervention for body muscle discomfort during prolonged standing

Many occupations require workers to stand for long periods of time without proper interventions, which causes discomfort in the back and lower limbs. Therefore, this study aims to assess the effectiveness in alleviating body muscle discomfort during prolonged standing through the use of a calf massager. This study was conducted among male workers at a manufacturer with production line workers and the list was obtained from the HR Department and simple random sampling was done by number categorization. A total of 100 respondents (50 respondents for both the control and the experimental groups) participated in this study. The experiment took place in a room with a similar setup for the production line. Each respondent was requested to perform the simulated task for 2 hr. For the experimental group, the calf massager was turned on every 15 min. At every 15‐min interval after turning on the calf massager, respondents from both groups were required to evaluate their discomfort level on a Borg's scale CR‐10 questionnaire. The results showed that the level of body discomfort among respondents in the experimental group reduced (20–30%) compared with that of the control group. Multivariate analysis results revealed that the discomfort rating for the lower back, knees, thighs, calves, and feet was significantly lower (p < .05) among the experimental group compared with the control group. For lower body parts, the lower back region was statistically significant (p < .05) at the 90th, 105th, and 120th min; the thigh region was statistically significant (p < .05) at the 120th min; the knee region was statistically significant (p < .05) at the 105th and 120th min; the calf region was statistically significant (p < .05) at all minute intervals except the 15th and 45th min, while the feet region, was statistically significant at the 105th and 120th min. Therefore, this study indicates that calf massage treatment is capable of reducing body muscle discomfort during prolonged standing and highlights the significance of calf massage.     

Smart firefighting construction in China: Status,problems, and reflections

“Smart firefighting” construction as a part of the “smart city” has been a concern of the public security and fire agencies at all levels. In this study, the status, problems, and reflections of “smart firefighting” construction in China are discussed. A recent survey indicates that China has launched its smart firefighting construction and initially created a new perspective on its regional smart firefighting work based on three main aspects: intelligent disaster perception by Internet of Things (IoT) construction, intelligent disaster prevention by big data construction, and intelligent disaster disposal by emergency rescue platform construction. However, the current smart firefighting construction in China still has some prominent problems such as the data interconnectivity and normalized management of various platforms, the extensibility of smart firefighting platforms, and the intelligent level of smart firefighting researches, which need to be solved urgently. Therefore, we argue that smart firefighting construction in China should establish data interconnectivity, industrial normalized management, 2D/3D geographic information interaction and extension, high-integration fire protection theory, and many other aspects in the near future and truly realize firefighting visualization and efficient data applications for 4D time space. This study could provide valuable reference for smart firefighting and smart city construction.     

雷达间的电磁兼容性判决

通过对雷达信号(或干扰)处理过程的分析,对发现概率和虚警概率的定义作了合理的扩展,使二者可以直接用于雷达间的电磁兼容判定,并在此基础上建立了雷达间电磁兼容判决模型.这种基于经典雷达信号检测理论的模型能客观、真实地反映出雷达间的干扰情况,并且可以应用在雷达间电磁兼容性预测模型中.     

孔板—均速管组合法测量汽—水两相流双参数

利用孔板与均速管组合在线测量汽—水两相流双参数，解决了稠油热采中同时测量蒸汽流量与干度的难题。其工作程序用Mcs-51单片机汇编语言编制而成，主程序由初始化、数据采集处理，热物理参数生成、汽—水两相流量、干度、质量流量、热量计算以及累计运算等模块组成。通过在现场进行标定；干度用化验CI^-法进行标定，流量用锅炉入口的涡轮流量计标定。经胜利和新疆两油田进行的大量试验可知，该仪表测量水蒸汽流量和干度其均方差皆小于7%，满足了工业应用要求。     

圆环扫描速高比计研究

介绍了圆环扫描速高比计(V/H计)的工作原理。给出了理论分析和实验结果。讨论了影响精度的原因和今后改进的方法。     

虚拟企业模型并行仿真研究

随着各种全新的制造理念,特别是虚拟企业的出现,企业模型的规模不断扩大,使目前存在的大多数企业模型仿真系统的效率大大下降。该文针对此问题,通过深入分析虚拟企业模型结构,并在已有的构件化企业建模体系CEMS及其仿真系统的基础上,结合异步仿真技术和多线程技术提出了一种分层式企业模型仿真体系结构,为虚拟企业模型的快速高效的仿真提供了一种有效的方法。     

多孔硅（PS）制备新方法

介绍了两种制备多孔硅的方法：电火花刻蚀法和激光辐射腐蚀法。讨论了这两种新方法制备的多孔硅样品的结构和发光特性，同时，与电化学法制备的多孔硅的结构和发光特性进行了比较。最后指出这两种新方法对于多孔硅形成机理和发光机制研究是有所帮助的。     

缓解外贸顺差过大改善出口产品结构——22种石化通用机械降低出口退税率

一、前言经国务院批准,2007年6月19日,财政部和国家税务总局商国家发改委、商务部、海关总署后,以财税〔2007〕90号文,发布了《关于调低部分商品出口退税率的通知》,自2007年7月1日起实行。     

Dependence of surface morphology of CVD diamond films on deposition conditions

ＤｅｐｅｎｄｅｎｃｅｏｆｓｕｒｆａｃｅｍｏｒｐｈｏｌｏｇｙｏｆＣＶＤｄｉａｍｏｎｄｆｉｌｍｓｏｎｄｅｐｏｓｉｔｉｏｎｃｏｎｄｉｔｉｏｎｓＹＡＮＧＧｕｏｗｅｉ（Ｄｅｐｔ．ｏｆＰｈｙｓ．，ＸｉａｎｇｔａｎＵｕｉｖｅｒｓｉｔｙ，Ｘｉａｎｇｔａｎ４１１１０５...     

多孔硅的电致发光和发光二极管

本文较详细地描述了多孔硅的电致发光(EL),以及发光的量子限制效应的机制,并且讨论了目前已经制备出的几种多孔硅发光二级管:Ps/电解液型,Schot-tky-Like,PN结等二极管。最后,讨论了多孔硅作为半导体光电材料所存在的一些问题。