高职院校学生社团建设探析

高职院校加强社团建设具有深层次的作用和意义。文章在实践的基础上总结分析了加强高职院校学生社团建设的背景、措施及需要解决的几个问题。     

Application of Block Copolymer in Three-Liquid-Phase Extraction System

Introduction Polyethylene oxide-polypropylene oxide-polyethylene ox-ide (PEO-PPO-PEO) block copolymers are non-ionic surfactants and include hydrophilic PEO and hydro-phobic PPO segments. Due to the presence of PPO central block, PEO-PPO-PEO copolymers ha…     

野生大豆胚胎学研究

本文观察了野生大豆大、小孢子发生、雌雄配子体发育以及胚和胚乳的发育,其主要结果如下: 1)雄性孢原为表皮下多列细胞。2)小孢子母细胞减数分裂的胞质分裂为同时型。四分孢子主要为正四面体型,少数为左右对称型。3)成熟的花粉粒为二细胞型。4)花药壁的发育属基本型。花药壁为五层细胞组成,从外向内依次为表皮层、药室内壁、二层中层、绒毡层。5)绒毡层细胞为单核,属分泌型绒毡层。6)单子房、倒弯生胚珠,双珠被、厚珠心,亚表皮下多孢原。7)大孢子四分体为线型排列,少数为“T”型排列。合点端大孢子为功能大孢子。胚囊发育属蓼型。8)大孢子发生较小孢子发生稍晚,但其发育速度较快、后期、雌、雄配子体同步成熟。9)胚的发育为柳叶菜型。10)核型胚乳,初生胚乳核先于合子分裂。11)胚乳发育的中、后期,合点端存在胚乳吸器。12)胚珠的合点部位存在着承珠盘结构。     

吉林省敦化盆地牡丹江不同河段水温差异与水稻生产

本文分析了郭化盆地牡丹江不同河段水温差异及其形成原因.对水温在水稻生产中的作用做了进一步研究.     

植物基因克隆的方法和策略

芬子生物学的迅速发展对克隆植物基因起了积极的推作用，本篇旨在介绍植物基因克的策略及研究进展。     

氯离子诱导的镍在硝酸溶液中的电流振荡

报道了氯了子诱导的镍在0．5mol.dm^-2硝酸溶液中活化－钝化过渡区电流振荡，在恒电位条件下，随着氯离子浓度的升高或者电极电位的降低，电流振荡由周期性振荡逐渐向非周期性振荡转变，根据实验结果，对该体系的电流振荡机理进行了讨论。     

Active Vibration Isolation System for Sub-microultra-precision Turning Machine

Now vibration isolation of ultra-precision machine tool is usually achieved through air-springs systems. As far as HCM-I sub-micro turning machine developed by HIT, an active vibration isolation system that consists of air-springs and electro-magnetic actuators was presented. The primary function of air-springs is to support the turning machine and to isolate the high-frequency vibration. The electro-magnetic actuators controlled by fuzzy-neural networks isolate the low-frequency vibration. The experiment indicates that active vibration isolation system isolates base-vibration effectively in all the frequency range. So the vibration of the machine bed is controlled under 10-6g and the surface roughness is improved.     

Hurst’s analysis to detect fluctuation of the jet in a two-dimensional fluidized bed

The experimental study of vertical jet in a two-dimensional fluidized bed is presented. The time series of vertical jet penetration depth are acquired by image processing. The fluctuation of jet which is studied by means of Hurst’s analysis becomes weaker with increase in jet velocity, fluidization number, particle diameter and static bed height. They are found that the signal is persistent and the fractal dimensional of vertical jet is between 1. 19 and 1. 64. Foundation item: Supported by Doctoral Foundation of China Biography: Zhou Ya-ming (1971-), male, born in 1971, Ph. D Candidate, majored in basic theory of two-phase fluid and fluidized bed.     

Banach空间上的微分同胚

本文利用非负强制函数及吸引盆的方法，将微分同胚问题转化为讨论相应纯量微分方程在[0,+∞)上存在非负解，得到了Banach空间的几个全局微分同胚定理，结论推广了文[5]、[7—9]、[12]中的一些主要定理．     

3种农药对二点叶螨生命力及繁殖力的影响

采用室内盆栽和叶盘饲养二点叶螨的方法，测定了不同浓度的三氯杀螨醇、辛硫磷和敌杀死对二点叶螨生命力和繁殖力的影响。结果表明：三氯杀螨醇、辛硫磷和敌杀死在二点叶螨的卵期处理，对成的产卵量 有明显的刺激作用（高浓度三氯杀螨醇40mg/L除外），敌杀死50mg/L处理还可提高幼若螨的成活率，辛硫磷和杀死50mg/L幼螨期处理，可以延长成螨的寿命，增加产卵量50mg/L和100mg／L处理后对卵的发育速度和后代成活率均有不同程度的刺激作用，3种药剂50mg／L和三氯杀螨醇100mg／L成螨期处理，均可大幅度提高雌成螨的产卵量，硫磷和敌杀死不同浓度处理成螨后，其后代成活率有不同程度的降低，而三氯杀螨醇处理后则有所提高，3种药剂在成螨期处理后对卵孵化率无明显影响。