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非等分辨率光线跟踪体绘制方法及其在超声CT三维成像中的应用 总被引:1,自引:1,他引:0
光线跟踪绘制是获得广泛应用的三维标量场数据的计算机可视化方法之一,它所处理的数据量之大要求数据压缩存放.本文推导了非等分辨率条件下数据压缩存贮时直角坐标系中的广义的射线方程及链式关系,研究了它在基于CT切片的超声三维成像中的应用.实例表明,该方法能够真实反映原始数据特征,即,对于大尺度物体(相对于换能器声场分辨率),该方法能够得到清晰的图像,而对于小尺度物体,由于原数据分辨率不够导致图像模糊,但是该方法仍然能够定性表明缺陷的存在. 相似文献
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The AFLT states |P〉Y1,Y2 has reflection symmetry, S^n|P〉Y1,Y2 = |- P〉Y2,Y2, nb =-2P, where S is the screening charge. AFLT state can be constructed using this reflect symmetry. We propose a recursion formula for this construction. The recursion formula is factorized completely. 相似文献
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Integrability plays a central role in solving many body problems in physics. The explicit construction of the Jack polynomials is an essential ingredient in solving the Calogero-Sutherland model, which is a one-dimensional integrable system. Starting from a special class of the Jack polynomials associated to the hook Young diagram, we find a systematic way in the explicit construction of the transition coefficients in the power-sum basis, which is closely related to a set of mutually commuting operators, i.e. the conserved charges. 相似文献
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