仿生物组织透射光偏振特性的实验研究

该文在实验上研究了线偏振光经生物组织的传输后偏振特性的变化。选择Intrialipid悬浮液作为实验用仿生物组织样品，并利用Beam Profile2350测量了线偏振的He—Ne激光照射不同浓度、不同厚度的仿生物组织样品时透射光经过检偏器后的光场空间分布。根据不同的检偏角度下透射光的空间分布状况，分析了透射点位置坐标、样品浓度和厚度对透射光退偏程度的影响。     

生态系统的稳定与非稳定

论述了生态系统的稳定与非稳定，给出其定义及分类，揭示其基本特性及两的本质差别，指出其与系统的固有特性及干扰有关；讨论了两与生物多样性的关系。为研究生物与环境的关系奠定理论基础。     

江西官山长柄双花木灌丛的群落特征与多样性

采用植物群落学的研究方法，对江西官山自然保护区长柄双花木灌丛群落特征及多样性进行了研究。结果表明，群落结构特征为单优势种群落，乔木层种类少，树冠不连续，灌木层以长柄双花木占绝对优势，林下更新较差。群落的物种多样性指数低，表明生境条件特殊，群落结构不稳定。     

对生态系统及生物多样性等理论问题的探讨

在简述生态系统基本特征的基础上，对生态系统是非平衡系统，是典型的耗散自组织系统进行论述；并对系统有序、无序、混沌状态的概念和相关关系及渐变、突变、分岔的区别作解释。阐述生命自组织的基本特性及新种的形成过程，同时用熵值作为生物多样性评价指标，证明了一个系统的熵值增加，物种多样性就丰富，熵值减少，物种多样性就较差。笔还就生物多样性与生态系统的稳定性问题进行了讨论，认为生物多样性与生态系统的稳定性没有必然的联系。     

天佛指山松茸资源属性及其可持续发展

充分阐述了天佛指山松茸资源的自然属性、可保护属性和保护区的科学管理基础及条件，指出这些是天佛指山松茸资源可持续发展雄厚的软、硬件基础，而争取到国家级自然保护区的管理力度和条件，加快科学技术应用和成果转化，形成现代化的松茸资源监控管理体系和松茸资源信息管理系统，将强有力地促进天佛指山乃至整个长白山区松茸资源的可持续发展。     

浅谈七年级生物教学中的理化知识分布与处理

分析初一生物教材(苏教版)中的理化知识分布特点,目的在于运用恰当的处理方法,使生物教学做到“对症下药”,提高教学效果。     

Real time observation of the photocleavage of single DNA molecules

A method for real time observation of photo-cleavage of stratched λDNA at single molecular level by a fluorescent microscope coupled with CCD is developed.DNA molecules stained with YOYO-1 are stretched by the mo-lecular combing technique and fixed on a modified slide.Then the Process of Photocleavage and relaxation of DNA under radiation of blue light is observed.We speculate that the conformation change of stretched DNA and the effect of water are likely to facilitate the effect of YOYO photocleav-age DNA molecules.The photocleavage effect of YOYO for stretched DNA may be useful to study DNA elasticity,cancer research as well as the interaction between DNA and dyes.     

生物入侵谁的黄昏

人类才是破坏生态体系的源头,是生物入侵的源头,也是破坏生物多样性的源头。 我们每一个人都必须开始反省自己的行为。因为,到了世界只剩下人类的那一天,生物多样性丧失将不再是诸多消亡物种的黄昏。     

生物机制在智能计算中的应用

揭示生物机制在智能计算中的应用。与生物学相关理论相结合 ,论述遗传算法、人工神经网络和DNA计算的生物机制 ,揭示生物学思想在其中的应用 ,说明现在各类学科交叉发展的趋势     

Design Optimization of Charger Based on PSPICE Simulation

The design of a high-frequency switching mode charger (HFSMC) was optimized using a PSPICE simulation of the charging system including a valve regulated lead-acid (VRLA) battery pack and the HFSMC.A high-frequency battery charging circuit model was developed to describe the battery dynamics when charging with DC current having high-frequency ripples. An IGBT circuit model, a high-frequency pulsed transformer coupling model and a silicon fast recovery diode model were also developed. Simulations were compared to laboratory measurements to verify the battery and system models. Simulation of the working states of an Fe-based nanocrystalline magnetic core used in the transformer shows that the transformer design can be optimized by adjusting the core gap and by employing an RC network. Further simulations show that the components in the output unit of the charger main circuit can also be optimized. Simulations also show that the battery dynamics Including the inductance should be considered for design optimization of the HFSMC.