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System size is more than a geometrical quantity in relativistic heavy ion collisions; it is closely related to evolution process, i.e. a different system size corresponds to a different evolution process, and whether QGP is produced depends on the system size. We propose that the system size should be under the same level when comparing the measurements from different colliding nuclei. The equivalence of the peripheral collisions of Au-Au and the central collisions of smaller nuclei is studied using the Monte Carlo method. Comparing the transverse overlapping area of the colliding nuclei, the number of participant nucleons and the number of nucleon-nucleon binary collisions in various colliding nuclei, we give an estimate of the correspondence in system size. This is helpful in the experimental comparison of the measurements from different colliding nuclei. 相似文献
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一种改进的螺旋桨相同步控制噪声模型辨识方法 总被引:1,自引:0,他引:1
阐述了相同步控制降噪的原理及简化噪声模型的建立方法;针对传统的辨识方法无法满足分布式方案的缺点,提出一种简化噪声模型的改进辨识方法,该方法能大大降低模块之间的通信实时性需求,提高相角寻优方案的可实施性,还能提高简化噪声模型的辨识精度;并采用HS-DY混合共轭梯度法提高求解速度,使改进的方法满足控制实时性要求;研究了不同的数据采集条件对辨识精度的影响,得到了合适的采集条件为取5~10个周期的数据;基于本文搭建的实验平台对改进的方法进行了验证,结果表明改进的方法比传统方法能更准确地预测最优相角,辩识精度提高约7°。 相似文献
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