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Objective To explore the influence of the acute cauda equina compression on the iumbosacral spinal cord; To clarify the pathologic change of the motor neuron after acute cauda equina compression. Methods 27 canis familiaris were randomly divided into 9 groups (3 in each) : one for normal group, one for control group, and seven for compression groups. The control group and compressed groups was given operation and the sac made of silica gel was placed under the lamina of L5-6. Water was injected into the sac until their posterior legs paralysis in compressed groups, the animals had been compressed for 4, 8, 12, 24, 48, 72, 168 hours. The control group were not injected water. Cells apoptosis was investigated with the technology of TdT-mediated biotin dUTP nick end-labeling (TUNEL) staining. The Bcl-2 Bax and Caspase-3 protein was investigated by immunohistochemical method. Results TUNEL staining cells in anterior horn presented after compressed 8-12 hours, and at 72 hours the number of positive cells got to maximum, it decreased subsequently after 168 hours. The protein of Bax, Bcl-2 expressed a little in normal motor neuron. The caspase-3 protein didn't express in normal ceil. They all reached the peak at 72 hours after compression. Conclusion The apoptosis of motor neuron occurred earlier after eauda equina acute compression. Bax protein restrained Bcl-2 protein then active caspase-3 and conduced apoptosis of motor neuron. 相似文献
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为克服机器人视觉伺服系统对位姿估算及标定精度的依赖性,结合前期特征识别和后期视觉伺服控制,提出基于冗余特征的机器人视觉伺服控制方法.首先,针对图像处理计算密集的问题,从加快特征提取运算速度考虑,研究了矢量数据的递归贪婪压缩算法;其次,从提高图像空间测量精度考虑,研究了基于向量正交性的亚像素特征提取方法,并结合合作目标形状,给出基于多边形形状拟合的目标识别实验性准则;最后,基于图像视觉伺服理论和任务函数方法,直接以具有亚像素级的冗余图像特征作为反馈信息,建立了机器人视觉伺服控制模型,并进行了视觉伺服验证试验.理论分析和实验结果表明,本文提出的视觉伺服控制方法能够在复杂的环境下快速稳定地提取伺服特征,并对标定误差和深度估计误差具有一定的鲁棒性. 相似文献
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<正>众所周知,发动机是传统燃油车的心脏,发动机的性能也是传统燃油车制造的核心技术。对于电动车,电机则是电动车的关键技术之一,它在电动车上的作用类似传统燃油车的发动机,但电机与发动机在基本物理特性方面存在很多不同之处。本文通过对电机与发动机的驱动方式和特性进行对比分析,能进一步掌握电动车的特点,为电动车的性能优化及故障检修提供参考。1传统燃油车和电动车的对比分析电动车的原始能量是电能,燃油车的原始能量是燃 相似文献
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此文通过分析船员、乘客、船舶状态、环境、和管理等渡船安全现状和问题提出了一个新的综合型渡船安全管理系统,即"3+X"渡船综合安全管理系统。该系统能将人船信息、环境信息、管理信息和其他信息汇集在一个系统平台中,以便于乘客、水文、气象和管理部分发布的信息能够及时地共享、交流和传递。"3+X"渡船综合安全管理系统,能够弥补各相关单位和部门工作衔接上的不足,是提供一切渡船信息的专用平台,开辟出一条新的渡船信息通道,以提高渡船信息交流效率,增强渡船监管力度,从而降低渡船事故发生的风险,确保渡船营运安全。 相似文献
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