湖南吉首市野生观赏植物区系地理成分与引种栽培

初步探讨了湖南吉首地区野生观赏植物的区系地理成分．该地产野生观赏植物79科，152属，280种，它们的区系地理成分有12个分布类型．根据“区系发生法”的引种理论，阐明了这些野生植物可以引种栽培的范围。     

NURBS曲线的半正交小波分解算法

为了对NURBS曲线进行精确的分解，提出了半正交B样条小波分解的新算法，同时给出了处理NURBS曲线的非整数阶分辨率的小波分解算法．对于NURBS曲线，无论它有多少个控制点，均可以对它进行半正交分解，而不受控制点数必须等于2‘ 3的限制，这对于NURBS曲线的多分辨率造型具有较大的应用价值．     

论工程量清单招标与投标

分析现行国际工程量清单招标投标的基本做法，针对我国推行工程量清单招标投标进程中存在的诸多问题，提出了在新的招投标模式下承包商应采取的应对策略及推行工程量清单招投标的若干政策建议。     

快速成形技术中轮廓环的分组算法及其应用

以平面内轮廓环的存在规则和相互关系为出发点，提出了一种简单实用的轮廓环的分组算法，通过本方法对平面的轮廓环进行分组，能够把一个平面分解成一系列简单的单连通区域，分组后的轮廓环不仅能够在进行其他运算时减少重复计算，而且可以在分区填充扫描线时减少分区数，从而减少实际扫描时的空跳．     

基于UML的LCA中产品系统的建模研究

从产品系统本身的内在规律和产品全生命周期的观念研究了生命周期评价(LCA)的对象——产品系统及其特性，建立了产品系统概念模型；利用统一建模语言(UML)建立产品系统的结构模型、功能模型和信息模型，并描述产品系统的建模过程。     

绕线式异步电动机转子斩波串级调速系统的研究

为了克服传统串级调速系统功率因数低的缺点,提出了一种新型斩波式串级调速方案,该方案利用整流桥和IGCT构成直流斩波电路来连续无级改变电机转速,同时介绍了一种新型电力半导体器件-集成门极换向晶闸管(IGCT)的特性和工作原理. 这种方法线路简单,对系统功率因数的改善也很有效.     

烯基锡化合物的区域和立体选择性合成进展

烯基锡化合物是取代烯烃的重要合成原料和中间体,在有机合成中有着十分广泛的应用.文章综述了区域和立体选择性地合成Z型或E型的烯基锡化合物的方法.     

工程装备的腐蚀与防护对策

叙述了工程装备在不同工作环境中的腐蚀失效形式，详细分析了其大气腐蚀、水介质腐蚀、土壤腐蚀等腐蚀形式产生的原因、腐蚀机理及行为，并从工程装备的选材和结构设计、电化学保护、施加高效防腐涂层等方面入手，制定了相应的防腐技术对策，从而达到提高工程装备使用寿命和可靠性的目的。     

A Study on the Surface Structures of Viscose-based Activated Carbon Fiber by FT-IR Spectroscopy and XPS

Using viscose fiber (VF) as starting material and common steam as activating agent, formation of oxygen structures in activated carbon fiber is investigated. In the preparation of samples, VF was first heated at temperatures between 450℃ and 900℃ in N_2 artmosphere. Then, in a successive activation stage, the product carbonized at 600℃ was activated in steam at 450-900℃ for 30 min, and at 600℃ for 5-30 min. The other carbonization products were activated at 600 and 900℃ for 30 min respectively. The products activated at 900℃ were then activated at 450℃ for 30 min again. The starting materiah carbonized products and all activation products were examined by FT-IR spectroscopy and some products were examined by X-ray photoelectron spectroscope (XPS). And the yields of the carbonized and activated products were calculated. By analysing these spectra, the amount of oxygen-containing functional groups of the activated products attained under various activation time, various activation temperature and     

Switched Capacitor Network Analysis by Means of TCM

The totally coded method (TCM) reveals the same objective law, which governs the gain calculating for signal flow graph as Mason formula does. This algorithm is carried out merely in the domain of code operation. Based on pure code algorithm, it is more efficient because figure searching is no longer necessary. The code-series (CS), which are organized from node association table, have the holoinformation nature, so that both the content and the sign of each gain-term can be determined via the coded method. The principle of this method is obvious and it is suited for computer programming. The capability of the computeraided analysis for Switched Capacitor (SCN) can be enhanced.