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We study the modificationA→A' of an affine domainA which produces another affine domainA'=A[I/f] whereI is a nontrivial ideal ofA andf is a nonzero element ofI.
      
Although Spin0 () is usually reducible, we show that a Casimir element for always acts scalarly on it.
      
A pattern for an element of a Weyl group is its image under a combinatorially defined map to a subgroup generated by reflections.
      
A frame in a Hilbert space allows every element in to be written as a linear combination of the frame elements, with coefficients called frame coefficients.
      
A wandering set for a map ? is a set containing precisely one element from each orbit of ?.
      
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In ordinary sampled-data control systems the system response to a step input can reach its equilibrium state only within n or more sampling intervals (n is the order of the controlled plant). In this paper multiple-impulses are used, instead of ordinary simple impulses, to speed up the system response. In such sampled data systems the system response to step input can reach its equilibrium state within less than n, even one, sam-pling intervals. Methods of design of such kind of sampled-data systems and their...

In ordinary sampled-data control systems the system response to a step input can reach its equilibrium state only within n or more sampling intervals (n is the order of the controlled plant). In this paper multiple-impulses are used, instead of ordinary simple impulses, to speed up the system response. In such sampled data systems the system response to step input can reach its equilibrium state within less than n, even one, sam-pling intervals. Methods of design of such kind of sampled-data systems and their com-ponents are discussed. In the last part of the paper methods of compensating sampled data systems with dead time elements is also considered.

在通常的脉冲控制系统中,当输入信号是阶跃函数时,系统的过渡过程至少在n个采样周期内才能完全结束(n是控制对象的阶数).文中考虑了采用宽度不等的多拍脉冲代替通常的单拍脉冲以加快系统的过渡过程.在采用多拍脉冲以后,系统的过渡过程可以在少于n个采样周期内,甚至在一个采样周期内完全结束.文中叙述了这种脉冲系统的综合方法,也讨论了系统中有关组成部分——脉冲组成器和校正装置——的构成方案及其参数的计算方法.最后并考虑了由于时滞引起的对系统动态特性有害影响的补偿问题.文中举有例题,对文中各节内容作必要的说明.

The beginning and ending times and the absolute ranges of the three elements D. H. and Z of 106. magnetic storms are determined and the main features of some most conspicuous storms are described. Discussions are given with respect to the mean magnetic character numbers and the sun spot relative numbers.

本文将青岛所发生之磁暴magnetic storms,择其比较显著者,凡一百零六个,规定其开始及完了之时间,并度量其三要素D,H,Z,之绝对摆幅absolute range。又就此一百零六个磁暴内,择其最足代表者七个,对於各种主要特性,加以比较详细之叙述:次复就此等磁暴所发生之年月日,选取万国地磁学会所指定之平均磁性指数,列为一表,以资比较最後并曾约略论及此等磁暴与太阳黑子之关系。

1. The albino mice were used for this study. The Golgi apparatus in the cells of the epididymis and the vas deferens of normal, starved, and refed animals were studied.2. The amount of the Golgi elements can be maintained by feeding, not only by the sex hormone.3. The Golgi apparatus may be regarded as a product of food assimilation, not a definite cell organ.4. It is suggested that the Golgi apparatus has similar organ with that of mitochondria and secretion granules, but with different quantity of lipoids....

1. The albino mice were used for this study. The Golgi apparatus in the cells of the epididymis and the vas deferens of normal, starved, and refed animals were studied.2. The amount of the Golgi elements can be maintained by feeding, not only by the sex hormone.3. The Golgi apparatus may be regarded as a product of food assimilation, not a definite cell organ.4. It is suggested that the Golgi apparatus has similar organ with that of mitochondria and secretion granules, but with different quantity of lipoids.

(1)本研究以白鼠为材料,就常态白鼠绝食及再餵之白鼠观察其副睾丸及输精管上皮细胞内之高基體。查得在绝食期内副睾上皮细胞之高基體逐渐減少,由网状體变为颗粒,先集于前端後卽散开,至三十六小时高基體绝少,再餵後復有颗粒出现於前端。 (2)输精管上皮细胞内高基體原作线状,列於细胞前部。绝食十三时後,变为颗粒。俟三十六小时後再餵,卽有许多小粒在细胞前端边缘或卽係高基體 (3)由此结果可知高基體之多寡,既视绝食与否而定,或可谓为食物同化之产物,非固定之细胞器官也。 (4)高基體之起源或与粒线體,及分泌粒同,但其所含类脂質之量不同。

 
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