Dynamic study on water stability of soil structure and soil characteristics of several types of soils in southwest China

Three suborder soils in southwest China were adopted, namely Ustic Vertisol, Stagnic Anthrosol and Ustic Ferrosol, so as to carry out the basic physical and chemical analysis respectively, to design a dynamic measuring method for water stability of soil structure and conduct the comparative study on the quality of the soil structure. The results indicated that （1） The water stability dynamic characteristic of the soil structure could well reflect the maintaining capability of the soil structure as time goes on. （2） The quality of several soil structures in southwest China was sequenced as follows： Stagnic Anthrosols 〉 Ustic Vertisols 〉 Ustic Ferrosols. （3） The water stability of soil structure is very positively correlated with the capillary porosity and the clay particle （D 〈 0.002 mm） content （Co）, but is very negatively correlated with the silt （D is 0.05-0.002 ram） content （Csc）, and （4） The dynamic functional equation of the water stability of soil structure in southwest China was established, so that the water stability characteristics of various soil structures could be quantitatively expressed and the quality of different soil structures can be quantitatively compared from each other.     

面向21世纪的公共图书馆馆员队伍建设

新世纪的到来给图书馆馆员队伍建设提出了新的要求。本文在分析这些新要求的基础上,对如何建立面向21世纪的公共图书馆馆员队伍提出了几点看法。     

Nurse plant theory and its application in ecological restoration in lower subtropics of China

urse plants are those that facilitate the growth and development of other plant species (target species) beneath their canopy because they offer benign microhabitats that are more favorable for seed germination and/or seedling recruitment than their surrounding environment. Nurse plants have been mainly used to restore vegetation in arid and sub-arid zones in recent years. Based on summarizing the definition of nurse plant and target plant, we review the nursing effect mechanisms, ecological factors that influence nursing effect, relationships between nurse plant and ecological restoration. This review also brings forward possible pairs of nurse and target species at lower subtropical areas. Furthermore, we provide the potential tendency in nurse plant research and application.     

德国知识产权人才培养模式研究及其对我国的启示

知识产权作为一门高度整合的专业学科,牵涉到科技、管理、法律等诸多领域,具有很强的复合性。在当今知识经济时代,知识产权是衡量国家核心竞争力的重要指标之一。随着我国的改革开放,尤其是处在WTO机制下的知识产权领域,对人才培养的质量和数量都提出了更高要求。对德国知识产权人才培养方面的法律、历史沿革、培养模式等进行了概括而系统的介绍,在此基础上,根据我国知识产权教育的现状对我国如何推动知识产权人才培养提出了探讨性的建议。     

基础研究的投入演变及其协调机制——以日本和韩国为例

通过对日本、韩国基础研究投入的历史演变分析,总结并比较其变化特征,同时,从宏观层面和中观层面探讨两国基础研究投入的协调机制,得到三点主要的结论和启示。     

中国古建筑虚拟现实系统的数据采集和处理

利用虚拟现实技术实现对古建筑的浏览漫游已经成为当前计算机三维制作技术在文物古迹方面的主要应用之一.Virtual Reality-Platform是近年来应用较广的三维虚拟现实平台软件,在介绍基于VRP实现古建筑三维模型虚拟现实步骤的同时,结合大觉寺的虚拟现实系统,重点探讨了中国古建筑虚拟现实系统实现过程的数据采集和处理,针对古建筑的特点和虚拟现实实现的需求对这两个过程提出了较为实用的建议.     

Characterization of high-yield performance as affected by genotype and environment in rice

We characterized yield-relevant characters and their variations over genotypes and environments （locations and years） by examining two rice varieties （9746 and Jinfeng） with high yield potential. 9746 and Jinfeng were planted in two locations of Shanghai, China, during 2005 and 2006. The results show that there was a large variation in grain yield between locations and years. The realization of high yield potential for the two types of rice was closely related to the improved sink size, such as more panicles per square meter or grains per panicle. Stem and leaf biomasses were mainly accumulated from tillering stage to heading stage, and showed slow decline during grain filling. Meanwhile, some photosynthetic characters including net photosynthesis rate （Pn）, leaf area index （LAI）, specific leaf area （SLA）, fluorescence parameter （maximum quantum yield ofPSll, Fv/Fm）, chlorophyll content （expressed as SPAD value）, as well as nutrient （N, P, K） uptake were also measured to determine their variations over genotypes and environments and their relationships with grain yield. Although there were significant differences between years or locations for most measurements, SLA at tillering and heading stages, Fv/Fm and LAI at heading stage, stem biomass at heading and maturity stages, and leaf nitrogen concentration at tillering and heading stages remained little changed, indicating their pos- sible applications as selectable characters in breeding programs. It was also found that stem nitrogen accumulation at tillering stage is one of the most important and stable traits for high yield formation.     

大学英语教改班学生英语学习策略的诊断与分析

学习策略训练是帮助学生提高学习效果,增强自主学习能力的有效途径。为使学习策略训练更有效和更有针对性,在学习策略训练之前,本文作者采取问卷的方法对参加教改的大学新生进行了英语学习策略的诊断和分析,然后对以后的学习策略训练和大学英语教学提出了积极性的建议。     

基于混沌理论的身份认证方案

基于混沌理论和一次性口令认证技术, 提出一种可以抵御常见攻击的身份认证方案. 解决了常规一次性口令认证方案不能抵御小数攻击、 明文传送迭代次数不安全以及传统Hash函数存在易于找到碰撞安全漏洞的问题, 该方案用混乱和散布性质好、 抗碰撞能力强的混沌Hash函数代替传统的Hash函数, 用混沌置乱排序算法产生的迭代次数代替网上明文传输的迭代次数, 具有较高的安全性.