, 2013 本发明涉及一种可拆分重组相位掩膜板及基于该相位掩膜板的波前编码成像系统，该可拆分重组相位掩膜板对应的相位掩膜函数是由具有相对位移量的两个余弦函数叠加而成，其一维函数表达式为：其中；α，m1和m2是相位分布函数的参数；x为归一化坐标；x的取值范围为[-1，1]；偏移量m1和m2的取值范围均为[-1，1]。本发明提供了一种可有效扩大系统景深的可拆分重组相位掩膜板，以及基于该相位掩膜板的 ...
樊学武, 赵惠
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, 2004 本文用声学的微幅波动理论和其他一些简化假设,较详细地分析了水中击波正入射于平板时空化的发生、发展和消失,研究并明确了空化对平板变形的作用的基本机制。报告提供了计祘平板变形具体公式,并包括一个祘例。水中爆炸波对板或壳的作用,可以分为两部分处理,一是击波作用,一是滞后流的作用。这两种作用是通过空化区而互相联系的。因此这里所提供的关于空化作用的基本机制 ...
郑哲敏
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[Development and evaluation of a positioning system for radiotherapy patient based on structured light surface imaging]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiWang Y +6 more
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, 2013 本实用新型涉及一种行波偏转器前置短磁聚焦飞秒条纹变像管，包括管壳及管壳内沿电子传播方向依次设置的阴极盘、光阴极、阳极、行波偏转器、短磁聚焦透镜、荧光屏，光阴极设置在阴极盘上，行波偏转器包括一对上下放置的相互平行的蛇形带，短磁聚焦透镜包括磁极靴、包裹在磁极靴内的通电螺线管、靠近短磁聚焦透镜入口处的磁极靴狭缝。本实用新型条纹变像管的整体结构有助于提高变相管的时间分辨率、空间分辨率、及动态范围，同时可以降低磁透镜设计上的难度，在保持聚焦效果的前提下亦可缩短系统的轴向长度 ...
李昊 +8 more
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[Endoscopic-assisted median nerve decompression combined with one-stage tendon transfer for reconstruction of thumb abduction in treatment of severe carpal tunnel syndrome]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiSui J +6 more
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Beijing Da Xue Xue Bao Yi Xue Ban, 2022 DU YY, Wang J, He L, Ji LN, Xu XW.
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[Myasthenia gravis after allogeneic hematopoietic stem cell transplantation: Two case reports and literature review]. [PDF]
Zhonghua Xue Ye Xue Za ZhiShi YJ +5 more
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Beijing Da Xue Xue Bao Yi Xue BanZhang P, Gao Y, Wu H, Zhang J, Zhang J.
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