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equivalent ellipse
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     It shows that the calculation by applying equivalent ellipse will produce a value of fin efficiency on the high side and the fin efficiency decreases with the increase of disturbing flow holes.
     结果表明,采用当量椭圆简化矩形翅片使肋效率偏高,增加扰流孔则导致肋效率下降。
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  equivalent ellipse
Based on threshold value of ΔK below which crack propagation ceases, the critical value of loading stress was determined for different shapes and sizes of pores using an equivalent ellipse concept.
      
Finally, as an engineering application, we provide an accurate formula for the evaluation of the Notch Stress Intensity Factors of a crack, mainly subjected to tensile stress, from the peak stress of the equivalent ellipse under the same loading.
      
The method makes use of elliptic displacement functions which are satisfied by the introduction of an "equivalent ellipse" obtained through first simulating the actual crack surface displacements as a part of a parabola or a hyperbola.
      
A new modified circular microstrip antenna with circular polarization is researched in this paper and a new method named for equivalent ellipse is proposed by authors to calculate the patterns, axial ratio and partial power gain.
      
The equivalent ellipse has the same major and minor axes as the particle, but has no angularity.
      


The SD male rat′s sciatic nerves were cut, and conventional epineurial repair was carried out under the operating microscope. Morphometric changes of regenerating fibres were studied in earlier stage of nerve regeneration by digital image analysis using image processing system. We found that within the first month the area of myelin sheath, the area of axon, quotient area of myelinated fibre/area of view field were parameters for indicating nerve regenerating and the last one may be a better quantitative parameter...

The SD male rat′s sciatic nerves were cut, and conventional epineurial repair was carried out under the operating microscope. Morphometric changes of regenerating fibres were studied in earlier stage of nerve regeneration by digital image analysis using image processing system. We found that within the first month the area of myelin sheath, the area of axon, quotient area of myelinated fibre/area of view field were parameters for indicating nerve regenerating and the last one may be a better quantitative parameter for assessment of nerver regeneration.We also found that there were no statistically significant "differences in parameters of roundness, ratio of major to minor axis of equivalent ellipse or the ratio of circumscribed box area to fibric area.This might be a morphometric characteristic of normally regenerating fibres.

本文用图像处理技术对横断的大鼠坐骨神经端对端外膜缝合后,再生初期的有髓纤维进行了形态定量学研究。发现在再生一个月内,有髓纤维面积与统计视场面积的比(百分含量或面积密度),髓鞘面积、轴突面积是反映再生的比较敏感的指标。衡量神经横切面有髓纤维圆的程度的参数之间相差没有统计学显著性意义,表明圆的程度没有大的变化可能是正常再生有髓纤维的一个形态学定量特征。

A new modified circular microstrip antenna is researched, and a new method named for equivalent ellipse is presented to calculate the pattern, axial ratio and partial power gain. The theoretical results agree well with the experimental data.

本文研究了一种变形圆微带天线,并针对本天线提出了一种“等效椭圆法”,利用该方法计算得出的方向图、轴比和部分功率增益都能与实测数据较好地吻合。

The FDM numerical analytic method is applied to calculate the fin efficiency of elliptic tube with rectangular fins on which the disturbing holes were dug by using additional source term technique.It shows that the calculation by applying equivalent ellipse will produce a value of fin efficiency on the high side and the fin efficiency decreases with the increase of disturbing flow holes.

采用有限差分数值分析方法,应用温度逐次更新处理技术对不同扰流孔下的椭圆管矩形翅片的肋效率进行计算。结果表明,采用当量椭圆简化矩形翅片使肋效率偏高,增加扰流孔则导致肋效率下降。

 
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