查询词典 native plants

As the complete characteristic curves of reversible pump turbine are often used to calculate the instantaneous parameters, this paper studies the characteristic curve and the wicket closure and opening law in pumped storage plants.Chapter 1 presents the importance and the necessity of this study and reviews the previous related research on hydraulic transient process and valve regulation in pumped storage plants.Chapter 2 analyzes the six collected characteristic curves of reversible pumped turbine and studies their diversification from the point of view of specific speed. The six collected discharge and moment curves with maximum efficiency have been fitted to piecewise continuous curves. This curve-fitting procedure is listed.Chapter 3 takes Liyang Pumped storage plant as an example and analyzes the effect of different characteristic curves on regulation guarantee parameters and the variety of its trochoid during the same operation status.Chapter 4 takes three pumped storage plants with different heads as examples and studies the characteristic of coordinated closure with wicket gate and ball valve and its effect on dynamic pressure in the spiral case, inlet pressure in the draft tube and the rise of rotating speed.Chapter 5 summarizes this paper and point out what should be done in the future research.

由于在过渡过程分析计算中，需要频繁利用可逆式机组的全特性曲线推求机组的瞬时参数，所以本文就特性曲线及关闭规律问题进行了研究，其主要内容如下：第1章，指出本文研究的意义和目的，回顾前人对水力过渡过程、抽水蓄能电站及阀调节的研究成果，在此基础上提出本文的研究内容；第2章，针对收集到的六套特性曲线，从比转速的角度出发来研究可逆式机组特性曲线的变化规律；并对六套曲线的最高效率流量和力矩曲线进行分段拟合，得到各分段函数的具体形式，再通过举例说明最高效率曲线的拟合步骤；第3章，以溧阳抽水蓄能电站为实例，分析讨论不同比转速特性曲线对调保参数造成的影响及对于相同工况其轨迹线的变化；第4章，结合高、中、低三水头段抽水蓄能电站，在导叶直线关闭的基础上，研究导叶与球阀协联关闭规律的特点及对蜗壳动水压力、尾水管进口压力及转速上升造成的影响；第5章，总结全文，提出今后研究的重点和方向。

In these plants, including national key protected wild tea plants, Bole tree, umbrella, flowers and trees, tourism and other 14 kinds of wood; Guangdong Province, there are two kinds of key protected plants.

在这些植物中，其中国家重点保护植物有野茶树、伯乐树、伞花木、观光木等14种；广东省重点保护植物有2种。

The observation showed that sterile plants and fertile plants in the pollen mother cell stage is not very different, when microspore mother cells of male sterile plants enter meiosis period, it could form normal tetrad cell , tetrad cell is normal in early development stage, In the uninucleate microspore stage , tapetal cells were vacuolization, the microspores were extruded to the middle by tapetal cells.

本研究利用石蜡切片法，结合光学显微镜技术对樱桃萝卜核质互作雄性不育系的不育株和对应保持系可育株的花药发育过程进行细胞形态学观察，观察结果表明：不育株与可育株在花粉母细胞时期差别不大，不育株的花药小孢子母细胞进入减数分裂期后，可以正常的形成四分体，四分体前期发育正常，而在单核小孢子期绒毡层细胞出现液泡化，绒毡层细胞向中间挤压小孢子。

It is characterized by simple plants such as liverworts; fossils of plants similar to vascular plants, e.g.

是地球历史上一个相对温暖的时段。

Beijing Botanical Garden in Xiangshan Park, Haidian District, and Yuquan Shan (Western Hills near the Temple of the Reclining Buddha), the approval of the State Council in 1956 the establishment of plants is a scientific research, popularize the knowledge of plants, Tour Watch open, germplasm preservation, promotion of new plants, such as excellent functions of a large-scale botanical gardens.

北京植物园在海淀区香山公园和玉泉山之间，1956年经国务院批准建立，是集植物科学研究、植物知识普及、游览观赏休憩、种质资源保存、新优植物推广等功能为一体的大型综合性植物园。

Effect of Arbuscular mycorrhiza on steppe plants and infection rate of steppe plants varied with species of the mycorrhiza and plants. The effect on Agrostis hugoniana was greater than on Festuca rubra in all inoculation treatments, and the effect of the combinations of Festuca rubra+Glomus mosseae and Agrostis hugoniana+Glomus intraradices were more significant than others.

4同一、不同AM真菌对不同或同一草地植物的侵染及所产生的菌根效应具有不同程度的差异，穗序剪股颖各接种处理普遍优于紫羊毛，紫羊毛＋Glomus mosseae穗序剪股颖＋Glomus intyraradices优于同组其他接种处理的趋势较为明显。

The comparison of the effects on the two plants indicated that Ranunculusjaponicus, Aconitum sinomontanum,Ⅰ pomoea cairica, Aconitum gymnandrum and Anaphalis lactea showed significant effects on the two plants (their M values were separately -0.87,-0.82, 0.71,-0.68 and 0.62) and consequently these five plants were hopeful to be developed into new herbicides of plant origin.

综合比较对2种植物的综合化感效应指数差异，毛茛、高乌头、五爪金龙(Ⅰpomoea cairica)、露蕊乌头和乳白香青作用效果显著（其M差值分别是：-0.87、-0.82、-0.71、-0.68和-0.62），这5种植物有望开发新型植物源除草剂。

Seed plants; comprises the Angiospermae and Gymnospermae; in some classification systems Spermatophyta is coordinate with Pteridophyta (spore producing plants having vascular tissue and roots) and Bryophyta (spore producing plants lacking vascular tissue and roots).

种子植物；包含被子植物部和裸子植物部；在一些分类中，种子植物等同于蕨类植物（其孢子能生成有维管组织和根的植物）和苔藓植物（其孢子生成的植物没有维管组织和根）。

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济南花痴网是一家专业供应济南花卉、济南绿植、济南花卉租赁、济南绿植租赁、济南花卉租摆及提供写字楼酒店宾馆商场医院的济南花卉养护、济南绿植出租、济南花卉出租、。。。

Pushed by Hamilton's theory, some botanists have discovered and testified aposematic coloration do exist in plants such as autumn leaves, young leaves of tropical rainforests, some thorny plants and reproductive organs of plants whereas some of them are still obscure or controversial.

起源于猎物－捕食者关系的警戒色理论在动物界得到了充分研究，但植物警戒色却不为人所知，直到2001年Hamilton关于秋季树叶颜色的信号假说公开发表后，才引起人们对植物警戒色的初步研究。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。