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The formation of hard bubbles (including dumbbell domains) in epitaxial garnet films by using a series of pulse bias fields was investigated in some detail. It was found that the effect of a series of pulses is not simply the adding up of that of a single pulse (the physical process of hardening of soft domain segments), but has its own regularity, there exist two other physical processes, i.e. further hardening and softening of hard domain segments. The experimental results can be reasonably interpreted... The formation of hard bubbles (including dumbbell domains) in epitaxial garnet films by using a series of pulse bias fields was investigated in some detail. It was found that the effect of a series of pulses is not simply the adding up of that of a single pulse (the physical process of hardening of soft domain segments), but has its own regularity, there exist two other physical processes, i.e. further hardening and softening of hard domain segments. The experimental results can be reasonably interpreted in terms of the above-mentioned three processes. 实验研究了系列脉冲偏场作用下外延石榴石薄膜的硬磁泡(包括哑铃畴)的形成规律。发现系列脉冲对畴段的作用不是单次脉冲作用(软畴段硬化的物理过程)的简单迭加,而有其特有的规律性,存在着硬畴段进一步硬化及硬畴段软化的另两个物理过程。运用上述三个物理过程对实验结果作了解释。 This paper is on the background of blood flow in asegment of an atherosclerotic artery.By using the flow-visualization tech-nique,the oscillating viscous flow field in localized narrowing tubes hasbeen researched qualitatively in the view of fluid mechanics.It is foundthat the oscillating flow has its own regularity and the vortices arestronger than those in the corresponding steady flow field.Reynoldsnumber,Womersley number and shapes of tubes all affect flow field.The flow visualization observations... This paper is on the background of blood flow in asegment of an atherosclerotic artery.By using the flow-visualization tech-nique,the oscillating viscous flow field in localized narrowing tubes hasbeen researched qualitatively in the view of fluid mechanics.It is foundthat the oscillating flow has its own regularity and the vortices arestronger than those in the corresponding steady flow field.Reynoldsnumber,Womersley number and shapes of tubes all affect flow field.The flow visualization observations are important to understand thefluid mechanics characteristics of the oscillating viscous flow in narro-wing tubes,and have been of value in conducting further quantitativephysical and mathematical models. 本文以探索发生了粥样硬化病变的动脉血管中的血液流动规律为背景,利用流动可视化技术,从流体力学角度定性研究了局部狭窄刚性管中的振荡流场。发现振荡流场有其独特的特点,其旋涡要强于相应的定常流场,雷诺数、Womersley 数以及管子狭窄形状都对流场有较大影响。该项研究对于认识狭窄管中粘性流场特性,建立相应的物理、数学模型、以及发展流动可视化技术都十分有意义。 The digital characteristics of circular structures and its relation with gold deposit are researched by using fractional theory and statistic analysis on circular structures from the remote sensing images of Guizhou-Guangxi region. It is found that circular structures of different geneses have different roundities and fractional dimensions. Orebearing circular structure has its own regularity which differs from that of nonorebearing circular structure.WT5HZ 通过对黔桂地区遥感图像环形构造的统计分析,应用分形理论研究了环形构造的数值特征及其与金矿的关系,发现不同成因的环形构造有不同的分维值和圆度,赋矿环形构造有其自身的规律,其分维值与非赋矿环形构造的分维值不同。
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