Experimental Research on Resonance Response Differences o f the Rotor System with Sliding and Rolling Bearings

Most of the research work on bearing-rotor systems usually simplifies the supporting bearing as a spring or damp system,and ignores that the resonance responses involve obvious differences when the same rotor system is supported by varying types of bearings．Aiming at the resonance responses of coast down running tests of the rotor system,we employed two different bearings in experiments：One is the fluid film journal bearing,and the other is the rolling element bearing．The experimental results obtained with the above bearings are compared．The resonance test Bode plots and orbit shapes of the rotor shaft are established．Also, summarized under resonance are the dynamic characteristics and regularities of the two types of bearing-rotor systems．The natural frequency and resonance mode of the same rotor system will change thoroughly with the type of supporting bearings．The results are helpful for system modeling,security running,dynamic design, the study of dynamic characteristics,and the fault diagnose of bearing-rotor systems．     

桔皮中果胶含量测定

采用３．５—二甲苯酚为显色剂，分光光度法测定桔皮中果胶含量，并对其吸收峰，显色条件，干拢物及排除干拢的方活进行了详细的试验，找出了桔皮中果胶测定的最佳条件。     

现代海平面上升对广西沿海影响的初步分析

近数十年来全球海平面相对上升明显，部分海岸及海滩已被侵蚀。根据初步研究成果，简要分析了海平面上升对广西沿海的影响。     

汽车ABS制动过程的道路识别

汽车ABS控制的效果与道路识别有着重要关系,在制动过程中实时对各轮胎所附着道路的附着系数进行识别,可及时地调整制动力,提高道路的附着利用率和制动效能,使汽车ABS控制更加合理．文中通过试验获得了ABS制动过程轮缸的可等效压力函数,由储气缸压力和轮缸压力控制阀开关信号的时间历程,推导出各轮的滑移率,进而得出附着系数,实现了道路识别．道路试验检测验证了该方法的可行性．     

Authorization Management Framework Based on Joint Trust-Risk Evaluation

0 Introduction Trust management[1-3] is an approach to managing authorization in distributed environ- ments. Blaze et al[1] firstly proposed the concept of trust, and took trust into consideration in au- thorizing. Probability computed via historical records is viewed as the grade of trust[4]. Trust is classified into two types: direct trust and recom- mendation trust. But modeling the subjective trust with the simple probability and expressing the integration of multi recommendation trusts b…     

Vegetation Restoration Technique System and Its Ecological Functions of the Degraded Ecosystem in the Arid-Hot Valleys —— Taking the Example of Typical Mode in Small Watershed of Yuanmou

This paper concluded the vegetation restoration technique system in the arid-hot valleys and studied the anti-erosion function, environmental function and biological diversity effects of vegetation restoration on the ecosystem in the arid-hot valleys. The results showed that the soil erodibility decreased significantly after the vegetation restoration. The climate environment of the small watershed had a great improvement after the vegetation restoration, of which the temperature decreased, the humidity increased, the harsh environment of dry and hot in this region changed. The studies of the ecosystem biodiversity were mainly on the analysis of the relations between biodiversity and ecological function of the artificial ecological forest pattern and the natural enclosed treatment mode on the severely of degraded land. It could conclude that the natural enclosed treatment mode is helpful to the biodiversity of the ecosystem and the improvement and stability of the ecosystem, and Leucaena artificial forest restoration pattern reduced the species diversity but optimized the ecological function. Therefore, as to the severely and extremely severely degraded ecosystem in the arid-hot valleys, Leucaena pattern of gully control and natural enclosed treatment mode are the relatively optimal choices.     

变质量非完整系统的非等时变分方程及其求解

本文给出变质量非完整系统的非等时变分方程.研究它们的解,并证明在一定条件下可利用第一积分来得到非等时变分方程的特解.     

三峡水利枢纽大江截流数值分析

采用正交曲线网格生成技术建立一种明渠导流双戗堤立堵进占截流的数学模型。该模型可精细模拟各种截流工况下龙口各水力参数的变化规律以及导流明渠的流态变化和过流能力。通过对三峡水利枢纽大江截流水力要素的数值预测，并与三峡水利枢纽二期围堰导流的模型实验资料进行了比照，结果吻合良好。该数学模型可为水利水电截流工程制定施工方案提供依据。     

基于本体的设计知识建模

研究知识建模问题,以支持设计知识的管理和重用．分析了设计知识管理面临的主要问题：提出了设计知识管理框架,该框架包括3部分：多种知识源设计知识获取、知识建模和设计知识检索;研究了基于本体的设计知识建模方法,包括设计知识本体的定义、基于本体的设计知识库建立、多视图设计知识检索等;讨论了基于本体的设计知识建模的优点．最后以前述研究成果为基础,开发了产品设计知识管理工具．     

铁电薄膜C-V特性测量研究

采用TH2828型LCR测试仪及四端对接测量方法,搭建了铁电薄膜的介电特性测试平台.利用此测试平台对自制钛酸锶钡(简称BST)铁电薄膜材料的C-V特性进行测量,能准确表征铁电薄膜的介电特性.