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流量谱
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  fluence spectrum
An implicit assumption behind the use of Peff is that the displacement is the same for all electron energies in the fluence spectrum.
      
For the deep-seated cervix target, an optimization of the entire energy fluence spectrum has also been attempted.
      
The calibration parameter must follow the continuous modification of fluence spectrum of primary particles and fragments.
      


In this paper we analyse the event of 20 Feb., 1988. and present that a new sunspot group emerged in the western of the solar disk with characteristics of fast evolution, converse polarity, anomalous arrangement of sunspot and rapidly increased SVC with type A1 spectrum etc., which may be the forecasting factors for occuring of some flare events

通常太阳活动水平紧密相关于日面活动区的结构及其演化特征。活动区愈复杂,活动水平愈强,太阳耀斑事件的频率愈高。当然也有一些例外,一是太阳耀斑事件与黑子活动区有时并不那么密切,甚至无关,如无黑子耀斑等;二是太阳光学事件与射电微波事件之间,也没有完全的一一对应关系,有时甚至相反,如有射电事件而没有光学事件等。88年2月20日事件正是属于后一种情况,也就是显著的微波事件对立于一般水平的光学事件。利用光学资料与射电资料,发现2695与2700MHz上的每日缓变流量与4951活动区的黑子数N和改正面积A呈好的相关。特别是与改正面积同步变化(见图3),由此可见,在二波段上的缓交流量变化可归之于仅仅是4951活动区演化的贡献,而日面上其它活动区则相对稳定,从而对此事件的4951活动区进行了初步分析,提出:对日面西边缘新生发展迅速的活动区,具有极性反转、分布紧密又呈异常排列的黑子群,它们的缓变分量迅猛增长,流量谱呈A1型等特征,可作为某些耀斑事件的预测因子。

Objective To investigate the value of color Doppler ultrasound (CDU) in diagnosis of dorsal arteries of the feet in elderly diabetes mellitus (DM). Methods The hemodynamic changes (the diameter, peak velocity, volume of blood, and spectral width) and pathologic changes (atheromatous plaque, stenosis, and obliteration) of dorsal arteries of the feet in 60 cases without DM and 90 cases with DM were examined by CDU. Results The dorsal arteries of the feet in DM patients showed that sclerosis, stenosis and partial...

Objective To investigate the value of color Doppler ultrasound (CDU) in diagnosis of dorsal arteries of the feet in elderly diabetes mellitus (DM). Methods The hemodynamic changes (the diameter, peak velocity, volume of blood, and spectral width) and pathologic changes (atheromatous plaque, stenosis, and obliteration) of dorsal arteries of the feet in 60 cases without DM and 90 cases with DM were examined by CDU. Results The dorsal arteries of the feet in DM patients showed that sclerosis, stenosis and partial obliterations led to different decrease in blood flow. The patients with history of DM more than 4 years were susceptible to pathologic changes of dorsal arteries of the feet. Conclusion CDU combined with frequency spectrum can judge the narrow and occlusive segments of dorsal artery of the foot in patients with DM.

目的 探讨彩色多普勒超声对老年糖尿病患者足背动脉病变的诊断价值。方法 对60 例非糖尿病者和90 例2型糖尿病患者应用7.5~12 MHz探头彩色多普勒超声检测其血管内径,峰值流速、血流量、谱宽度等血流动力学指标以及粥样斑块、狭窄、闭塞等病理改变。结果 2D超声显示糖尿病患者足背动脉的管壁增厚,伴管腔动脉粥样斑块、管腔狭窄及部分闭塞,彩色多普勒显示病变血管有不同程度的远端血流减慢;糖尿病病人病程超过4 年时发生足背动脉病变的病例数明显增多。结论 彩色多普勒超声结合频谱检测可以判断糖尿病患者足背动脉狭窄或闭塞的程度。

 
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