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gradient
相关语句
  相似匹配句对
     gradient elution;
     梯度洗脱;
短句来源
     Gradient of the Text
     文本的梯度
短句来源
     (3)Gradient development in the cortex.
     (3)皮质的发育梯度;
短句来源
     The conjugate gradient (CG) method is used.
     采用可在有限步内找出全局最优解的共轭梯度法 (CG)进行寻优。
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  gradient
A convexity theorem for noncommutative gradient flows
      
In this survey we shall prove a convexity theorem for gradient actions of reductive Lie groups on Riemannian symmetric spaces.
      
In the final section the theorem is applied to gradient actions on other homogeneous spaces and we show, that Hilgert's Convexity Theorem for moment maps can be derived from the results.
      
We observe that our methods clearly show that the restriction p>amp;gt;2n/n+1 is closely related to cancellation and size properties of the gradient of the Poisson kernel.
      
A new generalized gradient projection type algorithm for linearly constrained problems
      
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Self-recording system is devised and used to measure potential gradient at Yenching. In fine weather the results show two maxima and two minima for a whole day. During raining potential gradient is constant at zero value, except when lightening and thunderstorm occur in which case the potential gradient changes rapidly both in magnitude and direction.

本篇所述,为在北平燕京大学用静电计及一连续记录器测量大气电位梯度之方法及结果测量方法,乃用一种均位器(eqalizer)将离地面约3至6米高之电位显示于静电计上再用照相纸将此电位制成连续记录。测量所得结果如下:晴天之电位梯度。一日之中,有二最高值及二最低值雨时梯度即降至零,且此值非至雨止不变。当闪电及雷飓时,梯度之方向与值,变易极速。且较晴天时为大。

The purpose of this study was to find the response of the teleost's brain toward chemical stimuli.In carrying out the series of experiments, four species of teleost fishes were selected as working materials. They were Carassius auratus, Ophiocephalus argus, Monopterus javanensis and Hypophthalmichthys nobilis.The chemical agents for the experiments were selected as follows: Janus green, methylene blue, neutral red and crystal violet for staining purpose, i. e. for primary oxidation (Child' 47), in which the...

The purpose of this study was to find the response of the teleost's brain toward chemical stimuli.In carrying out the series of experiments, four species of teleost fishes were selected as working materials. They were Carassius auratus, Ophiocephalus argus, Monopterus javanensis and Hypophthalmichthys nobilis.The chemical agents for the experiments were selected as follows: Janus green, methylene blue, neutral red and crystal violet for staining purpose, i. e. for primary oxidation (Child' 47), in which the specimens were examined with the results recorded before reduction process set in; and in addition potassuim permanganate was used for complete oxidation-reduction purpose. The concentrations of the former agents in Ringer's solution and the latter in distilled water were experimentally determined, and are given in Table 1-4.In all cases of the stain experiments, the metabolic rates of the nosebrain (including only the olfactory bulbs and primitive endbrain in the present case) are higher than any other division, and that of the cerebellum, the balancing brain, comes out to be the next, being higher than all the other parts of the organ (with the exception of Carassius). The midbrain (part of the eyebrain) is less responsive than the cerebellum; and the medulla oblongata, without the facial and vagal lobes (brain centers for taste buds) and with its anterior regions (the earbrain) overshadowed largely by the cerebellum or only with little parts visible from above; i. e., the skinbrain, is, on the average, least responsive of allIn Carassius, the vagal lobes showed somewhat greater sensitivity than the cerebellum, and in Hypophthalmichthys they were less so than the facial lobes, which in turn almost matched up with the cerebellum. As a whole, it may be said that the olfactory lobes and primitive endbrain are most responsive and the midbrain and medulla oblongata least so, the cerebellum somewhat between them, while the facial and vagal lobes vary in their responses to these stains, but they fall between the endbrain and the medulla. If the records of both these lobes were removed from the curves on Carassius and Hypophthalmichthys, (Chart V (A)-(D)), these four curves would have a much closer resemblance in the general tendency of responses among themselves; i. e., the centers of greatest activities are located in the nosebrain, there is a considerable dropping in the eyebrain, while the cerebellum, the balancing brain, shows a great deal of rise in responsiveness, though it does not go so high as either the olfactory lobes or the primitive endbrain, and finally the medulla oblongata, the skinbrain, shows least responsiveness to the stains.The results of the oxidation-reduction process (Chart VI (A)-(D)) show more or less a general resemblance to those o?the stain experiments, but there are some differences, which should be noted. In the case of Carassius the primitive endbrain falls in its functional features a great deal below the olfactory lobes and is now even lower than the cerebellum, and the vagal lobes are about on the same level with the midbrain, while in the case of Monoptenis the cerebellum is the most active division of the brain and the medulla oblongata is similar to the midbrain. In general, it is reasonable to assume that the physiological gradients in the brains of Carassius and Hypophthalmichlhys are similar to each other, as they are of the same family, and those of Ophiocephalus and Monopterus are likewise, though they are of different families. In spite of some deviations these brains in both stain and oxidation-reduction experimentes show a general trend of similarity in their responses.It is concluded that the sensitivities of the brain surface to these chemicals are in direct proportion to its functional activities and in reverse proportion to their histogenetic age. Besides these factors, the polarity of the organ and the size of its division also have a significant bearings on the physiological gradient, but the latter should be considered together with the organization and developmental st

(一)此研究限于鱼脑的背面(因由腹面观察,不能看到全脑各部)。所用四种硬骨鱼是鲫鱼、乌鱼、黄鳝与黑鲢。 (二)鱼脑背面,分为五部分:嗅球、原始端脑、中脑、小脑与延脑。鲫鱼延脑背面前部有迷叶长出,鲢鱼延脑背面前部有面叶与迷叶长出。为研究便利计,将迷叶与面叶划为另外部分,分别观察其代谢现象。 (三)染剂用以刺激鱼脑者,为简氏绿、次甲基蓝、中性红与晶紫。此外,又用过锰酸钾作完全氧化—还原实验。 (四)对于以上各剂,鱼脑反应程度最高处是嗅球,大约与嗅球相等者,是原始端脑,稍次是小脑,再次是中脑,最次是延脑。黑鲢面叶与迷叶低于小脑,高于中脑,而面叶高于迷叶(曲线图Ⅴ(D)与Ⅵ(D))。鲫鱼的迷叶,对染剂的反应,高于小脑,对氧化—还原剂的反应,低于小脑(图Ⅴ(A)与Ⅵ(A))。 整个结论是鱼脑表面,对于化学药剂的感性与其生理功用成正比例,与其组织之年龄成反比例。除此二因素外,脑的极性(polarity)、脑各部分之体积,都与生理量度有密切的关系。唯体积关系,须与以后数点共同考虑:(1)组织的构成;(2)组织发达的程度;(3)在演化过程中该组织对于脑部继续发达,及其功用所有关系的重要性(不能单看体积的大小)。鼻脑在脑前端,...

(一)此研究限于鱼脑的背面(因由腹面观察,不能看到全脑各部)。所用四种硬骨鱼是鲫鱼、乌鱼、黄鳝与黑鲢。 (二)鱼脑背面,分为五部分:嗅球、原始端脑、中脑、小脑与延脑。鲫鱼延脑背面前部有迷叶长出,鲢鱼延脑背面前部有面叶与迷叶长出。为研究便利计,将迷叶与面叶划为另外部分,分别观察其代谢现象。 (三)染剂用以刺激鱼脑者,为简氏绿、次甲基蓝、中性红与晶紫。此外,又用过锰酸钾作完全氧化—还原实验。 (四)对于以上各剂,鱼脑反应程度最高处是嗅球,大约与嗅球相等者,是原始端脑,稍次是小脑,再次是中脑,最次是延脑。黑鲢面叶与迷叶低于小脑,高于中脑,而面叶高于迷叶(曲线图Ⅴ(D)与Ⅵ(D))。鲫鱼的迷叶,对染剂的反应,高于小脑,对氧化—还原剂的反应,低于小脑(图Ⅴ(A)与Ⅵ(A))。 整个结论是鱼脑表面,对于化学药剂的感性与其生理功用成正比例,与其组织之年龄成反比例。除此二因素外,脑的极性(polarity)、脑各部分之体积,都与生理量度有密切的关系。唯体积关系,须与以后数点共同考虑:(1)组织的构成;(2)组织发达的程度;(3)在演化过程中该组织对于脑部继续发达,及其功用所有关系的重要性(不能单看体积的大小)。鼻脑在脑前端,屡次实验,表现为最高生理量度之所在;此处之势力,支配全脑各部分。高等脊椎动物的大脑,

The Austausch coefficient may be obtained by wind structure. 1902 Ekman established the wind spiral theory in the friction layer. From the observed wind spiral, we may calculate of the Austausch coefficient by this theory. 1952 considered effect of the change of pressure field with height; i. e. the thermal wind effect, and found excellent results. But, Formula holds only for the condition in the stationary current flow, or in the stationary temperature pressure field and uniform temperature pressure gradient.In...

The Austausch coefficient may be obtained by wind structure. 1902 Ekman established the wind spiral theory in the friction layer. From the observed wind spiral, we may calculate of the Austausch coefficient by this theory. 1952 considered effect of the change of pressure field with height; i. e. the thermal wind effect, and found excellent results. But, Formula holds only for the condition in the stationary current flow, or in the stationary temperature pressure field and uniform temperature pressure gradient.In this paper, we consider the unstationary effect, as calculating the Austausch coefficient in the friction layer, and obtain a more general formula. Under some special constrains, it tends to be the or Ekman's formula. Then, this formula may be more accurate in calculation and more wide in application.Some calculations based on observed data by using these three different formulas are presented and compared.

摩擦层中湍流系数,利用风标的分布,可以测定之。1902年,爱克曼创立了摩擦层中风标螺线,利用风标螺线,可以测定摩擦层中的湍流系数。1953年,莱赫特曼考虑了气压场随高度的变化,即热成风的因素,获得了良好的结果。但是,莱赫特曼公式之应用,只限定于恒态吹流,或恒态均匀温压场的条件之下,方能准确使用。这样是在一般情况之下难以满足的。关于摩擦层非恒态问题,1947年赵九章、裘碧克曾经讨论过。本文仅就非恒态湍流系数测定问题予以进一步探讨。并得到了较有广泛意义之公式。而莱赫特曼公式,系属温压场恒态,温压场中温度、压力梯度在均匀情况之下,该公式之特解。爱克曼范式,系属气压场稳定,温度梯度恒态为零时,该公式之特解。这样,该公式的计算,使得湍流系数测定工作精确化和广泛化。 最后,本文作了一些实际资料的计算与分析,和讨论在自然环境中湍流系数的变化。

 
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