介电各向异性带壳颗粒复合体系中非线性光学特性研究

从拉普拉斯方程出发,利用等效介电常数法,从理论上推导出稀释条件下介电各向异性带壳颗粒复合体系的有效三阶非线性光学极化率的一般表达式,讨论了复合体系的有效介电函数εe≡εe+Xe|■O|2中有效线性介电常数和有效三阶非线性光学极化率随界面结构参数和各向异性强度的变化。     

Copyright and Fair Use in an Electronic Reserves System

ABSTRACT

The electronic distribution of closed reserve readings promises service and efficiency enhancements for circulation departments. However, complicated copyright issues are raised by such systems. In traditional reserve, section 107-fair use reproduction-has been used to defend photocopying of reserve readings for distribution to students. But in an electronic environment text is not only reproduced, but transmitted and displayed. While the Copyright Act assigns transmission and display privileges to rightsholders, fair use exemptions are given to non-profit educational institutions. This article examines sections 107, 109, and 110 of the Copyright Act in relation to the electronic distribution of reserve readings and fair use. It concludes that, when taken as a whole, copyright dramatically limits the conditions under which fair use may be applied in a simultaneous-user system displaying readings off-site.     

论深层搅拌桩在高填土方地区的应用——以武鸣地区为例

工程基础施工是工程结构的重要组成部分,事关工程造价与安全。本研究就工程基础施工的几种方案进行优劣势比较,重点就深层搅拌桩方案及其在高填土方地区的应用展开研究,并以武鸣县信用社工程为例进行了阐述,认为深层搅拌桩方案适合在高填土方地区推广和应用。     

不锈钢高压供气管内焊缝成形技术--氩气保护“内填丝”焊接法

高压供气管道常采用厚壁304不锈钢管道,TIG焊接是现场焊接常用方法,为解决在现场复杂环境下造成的焊缝内部气体保护不完全而产生的内焊缝氧化,内外焊缝颜色不达标,余高控制难度大,焊后管道流通面积减小等问题。经现场反复研究实验,最终采用“内填丝”焊接方法解决了以上问题,并提高了焊接效率。     

好氧颗粒污泥的研究进展

综述了好氧颗粒污泥颗粒化研究进展及好氧颗粒污泥处理技术在废水生物处理中的应用．着重讨论了好氧颗粒污泥的形成机理,分析了好氧颗粒污泥培养过程中的影响因素,以及好氧颗粒污泥技术在废水生物处理和工程应用中的研究进展．好氧颗粒污泥的形成、发展和成熟过程可分为5个不同阶段,污泥颗粒化过程取决于基质组成与负荷、适当的水力选择压和工艺操作参数等因素．     

啤酒厂厌氧池(UASB)的调节与恢复

针对某啤酒厂污水处理过程中使用的升流式厌氧池(UASB)进行了调节与恢复,通过监测厌氧池的pH与COD等数据找出UASB反应器处理效果差的原因,然后对三相分离器、布水管等进行调整,并二次启动厌氧池,恢复了UASB反应器的处理功能.     

言语交际中语境作用分析

语境是指人们在交际活动中的各种语言环境。语言脱离语境话语就失去了确切含义。因此语言必须依存于语境,语境在言语交际中发挥着各种极其重要的作用。本文重点分析了语境在言语交际中的作用。     

Storage and Subsequent Reactivation of Phosphate-Accumulating Aerobic Granules

Phosphate-accumulating aerobic granules cultivated in a sequencing batch reactor were composed of inner rod-shaped bacteria aggregates and outer twining filamentous bacteria. The influence of two-month storage under different conditions on the storage and subsequent reactivation performance of aerobic granules was investigated. After two-month storage the granules sealed at 4 ℃ in distilled water or normal saline (named granules A and granules B, respectively) could maintain their characteristics as before, while the granules idled in the reactor at room temperature (named granules C) exhibited decreased properties. During reactivation, granules A and granules B presented almost identical recovery performance, faster than granules C, in terms of phosphorus removal efficiency, mixed liquor suspended solids (MLSS), phosphate release and accumulating ability. The results suggest that hermetical storage at low temperature promoted the maintenance of the granular properties and the reviving behaviors of phosphateaccumulating aerobic granules, and storage medium had little influence on the storage and recovery performance.     

散粒体自组织临界性的多重分形分析

简述了自组织临界性理论的基本概念和多重分形原理方法,介绍了大尺度的非均匀沙堆模型实验,并表明其呈现出自组织临界性特征。并对沙堆系统的时空分形结构进行分析计算．确定了广义维数和奇异指数,得出多重分形特征谱。为研究沙堆的演化提出了多重分形动力模型。最后阐明了采用多重分形方法进行散粒体自组织临界性研究的意义。     

纳米颗粒薄膜的磁性

提出一种唯象的量子模型研究纳米磁颗粒膜在外磁场下的磁学性质 .用玻恩近似方法计算了两类不同磁相的颗粒膜的磁电阻 .结果表明 ,磁颗粒的平均散射截面随着原子数的增加而减少 ;巨磁电阻来源于传导电子与磁颗粒之间的与自旋有关的散射 .磁电阻随外磁场和磁矩的变化与已报道过的实验符合