浅谈步进式加热炉炉底机械设备安装技术

介绍了步进式加热炉炉底机械设备斜轨底座安装的方法,探讨了提升框架、侧部导向辊和上下托轮的安装技术。     

不同年龄健康人平地行走时足底压力对比分析

针对年龄因素对成年人平地自然行走时足底压力的影响进行研究.采用三维测力台系统,对20名不同年龄段的健康成年人在平地自然行走时的地面反力进行数据采集,经归一化处理后得到足底压力在前后、左右、竖直3个方向上的力-时间曲线图,运用统计学方法对步态特征量进行统计分析,把不同年龄段人平地自然行走时的足底压力分布进行对比分析.结果表明,不同年龄段人在平地自然行走时的足底压力分布存在一定程度上的差异性:老年组在竖直方向和前后方向上的步态时间参量要小于青年组,这可能是由于老年人行走时步长较小,使得身体重心经过髋关节的时刻要早于青年人.     

上楼、行路两用电动楼梯车的设计探索

简单介绍一种上楼、行路两用电动汽车的结构，包括行走、转向、传动等机构。     

利用加速传感器估算竞走运动员的步长与步频

运动捕捉技术是体育训练和教学的有力助手,可以通过捕捉运动参数来辅助教练员对训练效果做出评价和调整.基于三轴加速度传感器提出一种计算竞走步长及步频的算法,实时捕捉运动员的三轴运动信息,并采用低通滤波法剔除采样数据中的噪声干扰.基于步态周期内加速度曲线求解步频值,并建立了竞走单步步长的计算模型.测试数据表明:计算的步长和步频值准确度高、误差较小;获取训练中竞走运动员每一步态的步长和步频值,可以检测运动员技术结构的稳定性进.     

Motion speed modulates walking direction discrimination: The role of the feet in biological motion perception

The human visual system is tuned to the motions of biological entities, which provide potentially vital information for survival. The current study examines the interplay between motion speed and motion direction perception. Following a brief presentation of a point-light walker walking straight ahead or slightly leftward or rightward, observers were asked to quickly judge the walking direction (left or right). Participants showed better direction discrimination when the walker walked at a fast pace compared to a natural or slow pace, and this was not simply due to a difference in motion cycles. Moreover, walking direction sensitivity could be enhanced by increasing the feet motion speed alone, so long as the direction of feet movement was consistent with that of the other body parts. These findings demonstrate that our perception of walking direction is influenced by local motion speed, and highlight the role of the feet in biological motion perception.     

挖掘机行走结构及如何延长其使用寿命

本文主要介绍了液压挖掘机履带式行走机构的结构组成和工作原理,同时分析了挖掘机履带在使用过程中损坏的原因及如何延长其使用寿命。     

Construction of the primary physical map of rice chromosome 12

A primary physical map of rice chromosome 12 was constructed using marker-based chromosome landing and chromosome walking. A BAC library from IR64 was screened using 84 RFLP markers, 4 STS markers and 6 microsatellite markers on chromosome 12 by colony hybridization and polymerase chain reaction (PCR) amplification. A total of 59 contigs consisting of 419 BAC clones including 5 single-clones were physically aligned on rice chromosome 12 with the largest BAC contig covering 855 kb. The whole physical map had a size of ∼16 Mb and covered about 52% of rice chromosome 12. This physical map will be certainly helpful for map-based gene cloning of agronomically and biological important genes and understanding the genome structure of the chromosome. Foundation item: Supported by Rockefeller Foundation Biography: FU Bin-Ying (1965-), male, Ph. D. candidate, Reseach direction: plant molecular genetics.     

基于肌电信号的人体下肢运动意图映射研究进展

智能下肢假肢与下肢外骨骼是肢体功能障碍者恢复日常运动的重要手段。基于肌电信号的直接意图控制是其自适应、自主控制的关键技术之一。针对此问题,阐述了基于肌电信号的人体下肢运动意图映射研究进展,包括比例肌电法、肌骨模型法和人工智能算法,讨论了基于肌电信号的人体运动意图映射研究所面临的主要问题。最后,对该领域未来发展方向进行了展望和总结。     

模糊神经网络在四足步行机器人控制中的应用

将神经网络和模糊控制理论应用于四足步行机器人的控制中，并在实验基础上选取样本，设计了针对四足步行机器人的模糊神经网络控制系统．     

目标追踪位置估计的单目视觉算法

提出了单摄像机安装在机器人上的视觉伺服系统的位置估计方法．提出的方法集成了由运动恢复深度和由散焦恢复深度的技术以满足实时要求．对于远距运动物体，用Grassmarm-Cayley代数中的Plucker表示法获取物体的位置估计．对于近距运动物体，用多层前馈型神经网络来恢复物体位置．用提出的判据在两种方法中切换．实验结果表明，估计精度得以提高．