声发射模糊神经网络

在声发射BP神经网络的基础上,通过添加模糊输入层和模糊输出层,构筑成声发射模糊神经网络.对原先的声发射信号进行模式识别,既提高了神经网络训练的收敛精度,又改善了收敛速度和稳定性.从而进一步提高了声发射信号模式识别的实用价值.     

ATCA与MicroTCA打造电信市场的COTS平台

3G核心网是一个多媒体网络。尽管3G网络的基本结构是简单而直接的,但仍然含有大量的不同来源的网元设备。互操作性问题在这样的系统绝非小事,有大量的规划、测试与集成工作要做。随着ATCA与μTCA(MicroTCA)的诞生,有了广泛接受的标准来应对日益增长的网元实现方式多样性。ATCA与μTCA提供了标准化解决方案,它们适用于3G网元,无论是无线接入网还是核心网域,都可以采用相同的技术来实现绝大多数的网元。μTCA脱胎于ATCA,适用于接入网中的紧凑型系统,其应用领域不仅限于通信网络,还可用于其它任何需要紧凑型、高性能处理的领域。在…     

基于Rough集的磨削参数决策系统

本文介绍了5层模糊神经网络的优缺点，提出了基于Rough集构造模糊神经网络的方法，并应用于多传感器的磨削参数决策系统，达到控制磨削加工质量的目的。     

山东农药专项整治突出重点

从3月15日开始，为期3个月的山东省农药生产经营秩序专项整治活动正式启动，无证经营、生产销售无登记证、无生产许可证或无生产批准证书的农药产品，以及生产销售掺杂使假、以次充好等假冒伪劣农药产品将成为这次专项整治的重点。     

W200H镗铣床控制部分改造

本文详细介绍对W200H镗铣床控制部分的改造方案，并讨论了旧设备技术改造中应注意的关键问题。     

Effect of block weight on work demands and physical workload during masonry work

The effect of block weight on work demands and physical workload was determined for masons who laid sandstone building blocks over the course of a full work day. Three groups of five sandstone block masons participated. Each group worked with a different block weight: 11 kg, 14 kg or 16 kg. Productivity and durations of tasks and activities were assessed through real time observations at the work site. Energetic workload was also assessed through monitoring the heart rate and oxygen consumption at the work site. Spinal load of the low back was estimated by calculating the cumulated elastic energy stored in the lumbar spine using durations of activities and previous data on corresponding compression forces. Block weight had no effect on productivity, duration or frequency of tasks and activities, energetic workload or cumulative spinal load. Working with any of the block weights exceeded exposure guidelines for work demands and physical workload. This implies that, regardless of block weight in the range of 11 to 16 kg, mechanical lifting equipment or devices to adjust work height should be implemented to substantially lower the risk of low back injuries.