A new methodology for measuring the vibration transmission from handle to finger whilst gripping

The transmission of vibration from hand-held tools via work gloves and into the operators' hands can be affected by several factors such as glove material properties, tool vibration conditions, grip force, and temperature. The primary aim of this study is to develop a new methodology to measure and evaluate vibration transmissibility for a human finger in contact with different materials, whilst measuring and controlling the grip force. The study presented here used a new bespoke lab-based apparatus for assessing vibration transmissibility that includes a generic handle instrumented for vibration and grip force measurements. The handle is freely suspended and can be excited at a range of real-world vibration conditions whilst being gripped by a human subject. The study conducted a frequency response function (FRF) of the handle using an instrumented hammer to ensure that the handle system was resonance free at the important frequency range for glove research, as outlined in ISO 10819: 1996: 2013, and also investigated how glove material properties and design affect the tool vibration transmission into the index finger (Almagirby et al. 2015). The FRF results obtained at each of six positions shows that the dynamic system of the handle has three resonance frequencies in the low frequency range (2, 11 and 17 Hz) and indicated that no resonances were displayed up to a frequency of about 550 Hz. No significant vibration attenuation was shown at frequencies lower than 150 Hz. The two materials cut from the gloves that were labelled as anti-vibration gloves (AV) indicated resonance at frequencies of 150 and 160 Hz. However, the non-glove material that did not meet the requirements for AV gloves showed resonance at 250 Hz. The attenuation for the three materials was found at frequencies of 315 Hz and 400 Hz. The level and position of the true resonance frequencies were found to vary between samples and individual subjects.     

会议中心监控系统

随着计算机技术的快速发展,计算机及其各类数字设备在现代会议中心已得到广泛应用.如何把这些设备与传统的会议设施相结合,对其进行集中控制和统一协调是会议中心监控系统所关心的问题.本文结合工程实例,介绍了湖州电力会议中心监控系统的概况、系统设计及其特点等.     

数字图像探测仪的视频显示技术

数字图像探测仪在电子测量领域中具有重要意义,它使电子测量由一维探测扩充为二维展示。本文具体介绍数字图像测控仪中的重要作用,电路结构,数字图像隔行扫描技术性,非ＣＣＩＲ６０１标准图像的技术处理、控制器工作原理等。     

VE复合抗氧化剂在猪油中的抗氧化性能研究

以VE,VE分别与茶多酚、迷迭香、硫辛酸、槲皮素的复合物为抗氧化剂,添加到猪油中,比对其抗氧化性能。结果表明:VE、茶多酚、迷迭香、硫辛酸、槲皮素都具有一定的抗氧化效果,相同添加量的情况下单品的抗氧化能力大小顺序为:槲皮素>茶多酚>迷迭香>硫辛酸>VE;VE与四种天然的抗氧化剂1∶1进行复合以后与单一的抗氧化剂相比都具有一定的增效作用。     

Effects of the structural and cationic properties of AV2P2O10 solids on propane selective oxidation

The activity performances of five AV₂P₂O₁₀ compounds of either orthorhombic (A=Cd, Ca), or monoclinic (A=Cd, Ba, Pb) symmetry types, have been compared for propane partial oxidation. They present a rather good activity (9% of propane conversion at 460°C) and a high selectivity (60% of propene selectivity). Results are discussed as a function of the differences in the structural properties. Kínetic studies were also performed for propane and propene oxidation reaction.     

基于UPnP AV架构的数字媒体适配器系统的设计与实现

详细讨论了UPnP协议的体系结构、设备间互操作机制、网络组成以及DTCP—IP协议并在此基础上实现了基于UPnP AV架构的数字媒体适配器系统。本系统中用户可以使用遥控器借助DMA浏览、搜索、播放DMS上的媒体文件。DMA和DMS的通信使用DTCP—IP协议保证其通信安全性。     

便携式油井环境监测及气体检测系统设计

为了提高油井的安全生产水平和其环境的监控力度,提出了一种以STC12C5A60S2微控制器、NRF24L01无线通信模块和无线AV模块为核心的便携式油井环境监测及气体检测系统的设计。它利用STC12C5A60S2芯片的A／D转换功能和气体传感器来采集气体的浓度,用带云台的摄像机采集环境画面,通过NRF24L01无线发送模块和无线AV数据传输模块,将采集的浓度数据和环境画面传输到手持显示终端上进行显示。实验结果表明装置可以实时传回环境画面和准确的气体浓度,误差结果在允许范围内。该装置的使用,有利于确保检测人员的人身安全、检测效率及检测的精度,实用性强。     

竹叶抗氧化物在琥珀桃仁加工中的抗氧化效果研究

目的:研究竹叶抗氧化物(AOB)在油炸琥珀桃仁中的应用效果.方法:添加不同剂量AOB的琥珀桃仁,经烘箱60℃恒温加速氧化后每隔一定时间取样测定过氧化值(POV)、酸价(AV)及硫代巴比妥酸值(TBA).根据3个特征指标值来研究AOB在油炸食品中的抗氧化效果.用0.01％剂量的特丁基对苯二酚(TBHQ)、没食子酸正丙酯(PG)、茶多酚(TP)与AOB最佳剂量进行对比试验.结果:琥珀桃仁中AOB的最佳添加量为0.01％,过量添加AOB会促进琥珀桃仁的氧化酸败.结论:AOB的抗氧化性能优于等剂量的TBHQ、PG,明显强于等剂量的TP.AOB是一种可以代替合成抗氧化剂TBHQ、PG,用于油炸食品的极有潜力的天然食品抗氧化剂.     

基于局域网的桌面会议系统

讨论了基于局域网的桌面会议系统的模型及其设计和实现方法,并总结和介绍了UDP通讯技术及WIN-DOWS多媒体开发桌面会议系统的经验。     

微波对特种植物油品质的影响

对菜籽油、芝麻油、粟米油3种特种植物油进行微波加热和常规加热处理,并与不加热时的样品进行比较,分别检测其酸价和过氧化值;研究了微波加热对植物油品质的影响,同时也探讨了油脂中添加VE对其加热品质的影响.