负反馈

Based on average current mode, PI control adopts the same double loop structure as analog control; Repetitive control adds a feedback innerly to change the model of control object so that it can meet the requirements of stability. This equals to a three-loop structure.

PI控制的设计基于电流平均模式，与模拟控制的双环结构相似；重复控制的设计，内部增加一个负反馈，以改变控制对象的模型，使之满足重复控制的稳定性要求，相当于一个三环控制结构。

A gene circuit of negative feedback comprises 3 main genes: CCA1, LHY, and TOC1. The "external coincidence" model has been proposed for photoperi- odic regulation of flowering time.

拟南芥生物钟由CCA1、LHY和TOC13个主要基因构成了一个稳定的负反馈环，来调节昼夜节律中各个基因如APRR/TOC15重奏的作用，从而调控昼夜节律的相位。

Increase of phytophagous diversity leads to more parallel connections and enhances the control feedback of the system. Complexity of parallel connection structure can turn to stability,whereas series connection can not.

通过研究认为，群落中并联形式的多样性可增加系统的冗余和负反馈作用，导致系统的稳定性；而串联形式的多样性不能导致系统的稳定性。

Moreover, we established the model of apoptosis induced by corticosterone and explored the effect of gangliosides, which is a active component in pilous antler, on this apoptotic cell model. The effects of gangliosides on neurotransmitter release, neuronal filopodia formation, calcium signal cascade and 5-HTl A receptor-ligand competitive binding were also studied. 2. Theory study: The viewpoint on brain and kidney in traditional Chinese medicine and that in Western medicine were comparatively studied. The essence of the relationship between kidney and brain in traditional Chinese medicine Subsequently, in combination with the analysis on the results in the empirical study, we discussed the essence of the relationship between kidney and brain in traditional Chinese medicine from the viewpoint about the feedback mechanism of hippocampus-hypothalamic-pituitary-adrenal.

体外实验采用糖皮质激素建立神经细胞凋亡模型，研究鹿茸有效成分的干预作用，并从神经递质释放、神经细胞丝状伪足生成、神经细胞钙信号途径、5-HT_(1A)受体配体竞争结合等方面进行机制探讨。2、理论研究：比较中西医学对肾和脑的传统认识以及现代研究，分析中医学中肾和脑的现代科学内涵，结合实验研究结果，从现代生物学海马—下丘脑—垂体—肾上腺轴负反馈机制的角度对中医肾脑相关理论的实质进行探讨。

The results indicate that the decreased expression of TGF-β, TGF-β R2 play the negative feed back role in repopulation of mouse jejunum after irradiation.

TGF-β、TGF-β R1和TGF-β R2在小鼠小肠上皮细胞受照射后的再增殖过程中可能起着负反馈的调节作用。

Methods The CF iterative algorithm was applied to update the noisy detected emission sinogram data using the latest reconstructed image in the iterative process of PET reconstruction.

在PET重建的迭代过程中，此种负反馈迭代算法利用最近的一次重建图像来更新有噪声的探测到的发射正弦图数据。

The fall of LH and FSH in serum after HDMA therapy arose from the suppression of the hypothalamus-pituitary-adrenal axis. Otherwise, the elevation of E2 and PRL was unassociated with the clinical effect of HDMA therapy, but the high levels of the E2 and PRL are adverse to the prognosis o the patients.

HDMA可能是通过下丘脑—垂体—肾上腺轴的负反馈抑制作用，使LH和FSH分泌下降；体内E2和PRL升高尽管未见与HDMA的临床疗效有确切相关性，但其高泌乳素和高雌激素水平可能对患者的预后不利。

To meet the needs, a novel low-noise fiber laser with compound cavity structure is designed. The stable single-mode operation is realized by using a transient self-written fiber grating, produced by the effect of saturable absorption within a section of unpumped erbium-doped fiber, as narrow band filter for mode selecting and linewidth squeezing. Through optical path modification, the spectral signal-to-noise ratio is better than 62 dB.

激光器采用复合腔结构，以掺铒光纤作为工作物质，通过在未被抽运的掺铒光纤中形成的瞬态自写入光纤光栅的窄带滤波特性进行选模和压窄线宽，产生稳定的单频激光输出；经过光路改进，激光输出光谱信噪比优于62 dB；利用光电负反馈电路，弛豫振荡峰下降了约25 dB，低频段强度噪声也大为改善，有效地抑制了光源的强度噪声。

Negative feedback, as is described here, is most widely applied in the automatic controls of various kinds of mechanism.

负反馈，就跟这里所描述的一样，非常广泛地应用在各种机械的自控装置中。

What is the effect of NF in the form of recasts and clarification requests alone and in combination on EFL development in the task-based oral interaction?

研究问题主要包括：（1）在基于任务的互动过程中，负反馈对中国英语学习者的英语语言发展起什么作用？

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。