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threshold
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     (2) Threshold of NDVI.
     (2) NDVI植被指数阈值法。
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     THE THRESHOLD OF STEREOSCOPIC HYPERACUITY
     人的体视超视锐度阈值
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     THE THRESHOLD OF STEREOPSIS “COLLAPSE”
     体视感觉“崩溃”的阀值
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     Improved (t,n) Threshold Signature
     一种改进的(t,n)门限签名方案
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  threshold
The MCA algorithm consists of an iterative alternating projection and thresholding scheme, using a successively decreasing threshold towards zero with each iteration.
      
The system is subject to failure and it fails once the total cumulative damage level first exceeds a fixed threshold.
      
The Merris' conjectures for threshold graphs and d-regular graphs are proved.
      
For two important special cases of mass action incidence and standard incidence, global stability of the endemic equilibrium is proved provided the threshold is larger than unity.
      
The relationship between the order of approximation by neural network based on scattered threshold value nodes and the neurons involved in a single hidden layer is investigated.
      
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The receptive relaxation of the stomach has been observed on esophageal and gastric fistula dogs following distension of the esophagus by means of a small balloon. The results were as follows: (1) Reflex relaxation of the stomach co(?)ld be induced readily by distending the esophagus. The threshold of such a stimulus has been determined to be 4-6 cc of air and the latent period, 3-5 seconds. This threshold value was not always strong enough to bring about concomitantly a secondary peristaltic wave....

The receptive relaxation of the stomach has been observed on esophageal and gastric fistula dogs following distension of the esophagus by means of a small balloon. The results were as follows: (1) Reflex relaxation of the stomach co(?)ld be induced readily by distending the esophagus. The threshold of such a stimulus has been determined to be 4-6 cc of air and the latent period, 3-5 seconds. This threshold value was not always strong enough to bring about concomitantly a secondary peristaltic wave. Thus, the relaxation of the stomach is not a result of the secondary peristaltic wave in the esophagus. (2) That the integrity of both vagi in the neck is necessary for inducing the above mentioned phenomenon has been confirmed in this work in dogs by applying parasympathetic blocking drugs or after bilateral vagotomy. (3) By using the receptive relaxation reflex of the stomach as a basis, artificial conditioned reflex has been established with the sound of an electric bell or a metronome as indifferent stimulus. The formation of the conditioned reflex seemed to be fairly easy as evidenced by the fact that after about 40 times of combination, a definite conditioned reflex of the relaxation of the stomach appeared and after about 60 combinations, it became more distinct.

本实验用具有食道瘘和胃瘘的狗,利用小氣球擴张食道的方法,进一步观察引起胃容受性舒张的条件,结果如下: (一)机械地扩张食道可迅速引起胃的容受性舒张,食道扩张刺激的阈值是4—6毫升,潜伏期是3—5秒。此阈值并不能经常同时引起食道二级蠕动波。因此,胃的容受性舒张的产生似不取决於食道的二级蠕动波。 (二)注射抑制副交感神经药物或切断颈部迷走神经後,刺激食道即不再能引起胃的容受性舒张反射。因此,在狗体上和猫体上一样,颈部迷走神经的完整是产生胃的容受性舒张所必需的。 (三)用食道扩张刺激为基础,以电铃声或节拍器聲作为条件刺激,可形成胃容受性舒张的条件反射。在结合四十余次後,即出现条件反射;在结合六十余次後,条件反射性的胃的容受性舒张则甚明显。

The intestino-intestinal inhibitory reflex has been studied in conscious dogs provided with two Thiry fistulas.It was observed that: (1)Distention of a segment of intestine by an inflated balloon at a pressure of 5-10 mm Hg regularly produced rhythmic contractions of the same segment without obvious change of tone,but if the intra-intestinal pressure was raised to about 25 mm Hg,the movement became peristaltic, with great fluctuation of tone and rhythmic contraction. (2)A greater increase of intra-intestinal...

The intestino-intestinal inhibitory reflex has been studied in conscious dogs provided with two Thiry fistulas.It was observed that: (1)Distention of a segment of intestine by an inflated balloon at a pressure of 5-10 mm Hg regularly produced rhythmic contractions of the same segment without obvious change of tone,but if the intra-intestinal pressure was raised to about 25 mm Hg,the movement became peristaltic, with great fluctuation of tone and rhythmic contraction. (2)A greater increase of intra-intestinal pressure of one segment caused reflex inhibition of both segments.Very occasionally,however,re- flex augmentation occurred. (3)The threshold of pressure stimulus for reflex inhibition decreased on repeated stimulation,so that finally it might reach a value of as low as 20-30 mm Hg.On the other hand the intensity of inhibition increased on repetition. (4)The intestinal motility and its reflex change varied with the state of cortical activity of the animal.The intestinal movements diminished in amplitude when the dog became sleepy on the stand,but regained their size once the animal was aroused.On the other hand,when the dog showed uneasiness and excitement on the stand,intestino-intestinal inhibitory re- flex was greatly depressed. (5)The sound of metronome or electric bell was used in combination with the pressure stimulus.At the very beginning the unconditioned re- flex was inhibited by the extraneous stimulus,which is considered as a case of external inhibition.The external inhibition gradually subsided on re- petition and clear-cut conditioned reflex was established after about 40 combinations.The conditioned reflex could be easily extinguished and re- established,just as in the case of other reflex systems.

在狗的慢性实验中,以5—10毫米水银柱的压力扩张一段小肠时,本段肠发生整齐的节律性收缩活动,如压力在25毫米水银柱左右时,则发生阵发性节律收缩及相应的紧张度的变化,更大压力引起广泛的肠抑制反射。重覆刺激可提高感受野的敏感性。大脑皮层对小肠的节律性活动及小肠运动的抑制反射具有影响,睡眠时肠运动减弱,而新异动因对肠抑制反射有外抑制作用,动物在暴燥不安时,不易引起肠抑制反射。在肠—肠抑制反射的基础上,可以节拍器及电铃声建立条件反射,约40次结合后条件反射即可明显出现。在长期间隔后,条件反射消退,但很容易重新建立起来。

The influence of fluctuation on an auto-oscillation system of Thomson-type is discussed. It is shown that the fluctuation of amplitude at the threshold of oscillation is much greater than that when the system is far from the threshold. In the latter condition, the expression obtained for amplitude fluctuation agrees with that obtained by I L. Berstein and the others.

本文讨论涨落对汤姆生型电子管振荡器的影响。所得结果表明此类自振动系统在自激阈附近的振幅涨落比远离阈值时的涨落大很多。本文中所求出的振幅涨落的表达式在远离阈值时的结果与等人所得结果一致。

 
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