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A class of fast-scale bifurcations appearing around the maximum value of the input voltage is discovered for the first time by experiment. Then the influence of the fast-scale bifurcations on the performance of the PFC converters is discussed. Whether the fast-scale bifurcations will appear and how wide the bifurcation region depend on the characteristics of the current loop output. Therefore, the main factors that affect the current loop output are analyzed, including the current loop parameters, inductance, and root-mean-square value of the input voltage.

通过实验，该文首次发现了一类在输入电压最大值附近发生的快时标分岔；详细讨论了快时标分岔对PFC变换器性能的影响；由于电流环输出的特点决定了变换器是否会出现快时标分岔以及分岔区域的大小，该文分析了影响电流环输出的主要因素，包括电流环参数、电感值和输入电压有效值。

Objective To study on qualitative and quantitative methods for the main active constituents of acanthopanax senticosus by TLC and HPLC and compare the quality of stem with the quality of root and rootstalk.

目的采用薄层色谱法和高效液相色谱法对市售刺五加根、根茎、及茎中主要活性成分进行定性定量研究，比较刺五加根、根茎、及茎的质量。

Help advance somebody's career what what is appropriate to the occasion offers fixed rate is shady, maintain temperature to be in 12, 29 ℃ left and right sides, winter temperature appropriate is maintained in 16, 18 ℃, chun Xia two season grow exuberant, need taller air humidity, can undertake sparge; To soil the requirement does not father very, but the requirement keeps measurable and wet, grow seasonal, about 2 weeks apply fertilizer, and winter soil can work a bit and cool, reduce fertilization number; The method of minute of root is used more when breed; At Chu Xia season undertakes, return the method that can use cuttage additionally; Main pest has powdery flea, red spider, aphid, scale insect to wait.

栽培时宜给予一定程度的遮阴，并保持温度在12—29℃左右，冬季温度宜维持在16—18℃，春夏两季生长旺盛，需较高空气湿度，可进行喷雾；对土壤要求不甚严，但要求保持适度湿润，生长季节，约2周施一次肥，而冬季土壤可稍干和凉爽，并减少施肥次数；繁殖时多采用分根的方法；于初夏季节进行，另外还可采用扦插的方法；主要害虫有粉蚤。红蜘蛛。蚜虫。介壳虫等。

With the methods of hydroponics and paraffin dissection, influences of main-functional allelochemicals derived from the leachates of Ageratina adenophora Sprengel on anatomical structures of upland rice seedling root tips were investigated in this paper.

采用营养液培养法和石蜡切片技术，研究了紫茎泽兰淋溶主效化感物质对旱稻幼苗根尖解剖结构的影响。

BACKGROUND: Previous studies exhibit that stilbene glucoside, which is the main active component of poygonum multiflorum root, has effects of reducing blood lipid, anti-atherosclerosis and protection of cardiovascular.

背景：大量实验表明，中药何首乌有效活性成分二苯乙烯苷具有降血脂、抗动脉粥样硬化和保护心血管等作用。

Its main product—"YUHANG multi-element leaf surface fertilizer" has the function of taking place of the root superaddition fertilizer.This function has never appeared in other brand.

但是，其主要产品"宇航牌多元素叶面肥"，有其自身的核心竞争力——可以替代跟内追肥，这是市场上现有的任何一种叶面肥所不具备的。

The main function of the plant root is to take in moisture and nutrition from the so.

植物的根的主要功能是从土壤中吸取水分和养分。

According to the above results, we can figure out that a CDPK was located on maize root tonoplast. It is an important protein during salt stress. Phosphorylation is a main manner to regulate the activity of V type H〓-ATPase.

根据以上结果可以认为，玉米根液泡膜上存在钙依赖的蛋白激酶，而且这种CDPK在适应盐胁迫过程的早期发挥着重要的作用；磷酸化作用是调节V型H〓-ATPase活性的重要方式之一。

Occlusal traumatism and alveolar bore absorp-tion were the main causes of vertical root tracture.

为探讨老年患者牙根纵折发生的原因、主要临床特点以及治疗和预防方法，笔者对59例62颗患牙进行临床总结、分析，做回顾性研究，现报告如下。1。

Most of the nutrients,for example polysaccharide,in root were much higher than those in 1-year-old branches,otherwise there was no significant change in the mineral elements between roots and branches.It is said that the roots and the branches of tree peony are the main organ of the nutrients storage and path of nutrients transference respectively.

是世界上园艺化最早的植物之一，是我国的传统名花，作为观赏栽培已有1600多年的历史[1]，在长期的栽培过程中人们对它们的生长习性有了深入的了解，对其繁殖与栽培管理积累了许多宝贵的经验[2～4]；然而牡丹的施肥管理却仍停留在传统的施肥方式上，这无疑影响到牡丹产品质量的均一性，降低牡丹的观赏价值。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。