, 1980 本文是在飞机发动机涡轮轴应力分析的基础上提高为变截面圆轴扭转问题的一个新解法.利用向量的散度和旋度对不同坐标系是不变量的特点,通过张量分析推导出在任意非正交曲线坐标系中变截面圆轴扭转问题的平衡和协调方程,包括用应力函数表达的协调方程和应力函数与应力分量的关系式.用任意非正交曲线坐标和差分法求解应力函数.本文计算得到了全轴的等应力函数线和剪应力分布,并得到沿小凹槽边任意点的应力,计算结果和光弹试验结果接近.本文还计算了有解析解的空心锥轴,误差小于百分之一.通过计算说明本文提出的新解法收敛性很好 ...
李敏华
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, 1983 1.基本方程及其数值求解由于讨论的是轴对称问题,因此取柱坐标系中的θ坐标为任意曲线坐标系(q~1,q~2,q~3)中的q~2坐标,在轴纵剖面Z—R平面上取任意非正交曲线坐标q~3和q~1 ...
任孝安
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Se PuZhang J +4 more
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快速無需校正的非線性畸變修正法於條碼解讀-實現工業級二維條碼Aztec (ISO/IEC24778)解碼器
, 2011 [[abstract]]本研究依照國際標準ISO/IEC 24778，以工業電腦視覺系統開發平台，設計與實現一種可自動修正非線性畸變(Non-Linear Distortion)之工業級Aztec二維條碼解碼系統。此法將條碼的非線性畸變，分別在垂直或水平方向上，以二次?物線近似，取條碼影像上下緣或左右緣為基準進行四次?物線擬合，並基於由上至下或由左至右的?物線曲率為線性變化的合理假設，得出所有像素於失真前後的近似非線性關係，並據此進行反轉換。此法僅需四條?物線的擬合及二次多項式中的簡單乘除運算 ...
郭宜忠
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[Bone marrow infiltration of large B-cell lymphoma with clinical manifestations similar to systemic lupus erythematosus: A case report]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanMa D +5 more
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Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiQin C, You H, Zhang R.
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Nan Fang Yi Ke Da Xue Xue BaoChen Y +8 more
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Hua Xi Kou Qiang Yi Xue Za ZhiHuang D, Wang X, Huang Z, Ye L.
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Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiChen L, Ran X.
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