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.     

一种自适应选取参考帧的多视点视频编码方案

多视点视频是目前视频编码的研究热点之一。为了提高多视点视频的压缩率和视觉质量,本文提出了一种自适应地选取B帧作为参考帧的编码方案。通过将相邻的两个P帧或I帧间的残差与两个预先定义的阈值进行比较,该方案自适应地选取B帧作为参考帧,从而获得较好的压缩效率和视觉效果。该方案采用H.264/AVC的编码器JM实现,并取得了预期的测试结果。     

不锈钢线材303Cu和302HQ的生产实践

宝铜股份公司特殊钢分公司于2003年底新投产了一条具有当今世界先进水平、专业化的不锈钢长型材生产线,在该线上先后开发出近百余个牌号的不锈铜线材产品.通过对易切削不锈钢303Cu和超低碳不锈铜302HQ的生产工艺开发的论述,可得知通过加热制度的调整可以有效控制MnS在303Cu钢中的形态,从而解决轧制过程中头部开裂的问题;控制302HQ钢的轧制温度,优化生产线相关配件,可以解决轧制过程中引起的表面擦伤问题.     

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.     

制取低酸价油工艺的研究

本文研究用碱性物质处理植物油料生坯，然后用石油醚进行浸出试验，在不同的条件下，对提取的油样进行分析和测定，其结果初步表明：用碱性物质处理后的油料在制油过程中，所得的油品质量大大提高，与传统工艺相比，在不影响出油详细率的前提下，具有油品的酸价低，色泽浅等特点，指出本实验条件最佳加碱量为完全中和油料内油脂中游离脂肪酸所需当量碱的２倍。     

湿法炼锌工艺中氟氯离子的极谱法测定研究

探讨了用智能化极谱仪JP-303型极谱分析仪测定湿法炼锌工艺中相关物料中F^-1、Cl^-的分析方法,氟离子在六次甲基四胺－茜素络合剂－镧－内酮体系中测定;氯离子存约0．2mol／LHClO4介质中测定,所拟厅法快速简便,灵敏准确,与传统方法比对结果吻合,效果良好。     

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.     

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.     

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。