几种铈盐的热分解过程及非等温热分解动力学研究

利用TG—DTG—DTA热分析技术研究了二水合碳酸亚铈、九水合草酸亚铈、六水合硝酸亚铈三种铈盐的热分解过程．发现二水合碳酸亚铈在75-180℃下脱去2mol水生成无水碳酸亚铈，后者在220—300℃下分解脱去CO2生成CeO2；九水合草酸亚铈在100-180℃下脱去9mol水生成无水草酸亚铈，后者在290—380℃下分解并同时脱去CO和CO2生成CeO2；而六水合硝酸亚铈在60—80℃下首先脱去3．5mol水生成含2．5个结晶水的硝酸亚铈，后者在190-250℃下脱去2．5mol结晶水生成无水硝酸亚铈，在258—310℃下硝酸亚铈热分解脱去NO2和O2并生成CeO2．采用外推法研究了九水合草酸亚铈两步热分解过程的动力学，由不同升温速率下的热分析曲线及外推β→0获得了相应的固相热分解反应所遵循的分解机理及动力学参数．发现九水合草酸亚铈脱水过程遵循球形对称的三维扩散机理，即Jander方程G（α）=G（α）=[1-（1-α）^1/3]^2，动力学参数E=180．9kJ／mol、lnA=63．5s^-1；而脱CO和CO2过程遵循成核和生长机理，即Avrami-Erofeev方程G（α）=[-ln（1-α）]^1/1.5，动力学参数E=115．4kJ／mol，lnA=22．0s^-1．     

基于覆盖网络的内容路由算法

结合传统的内容分发网络(CDN)路由技术,提出了基于覆盖网络的内容路由技术.阐述了基于覆盖网络的内容路由技术的网络模型和系统框架,将基于覆盖网络的内容路由技术和传统的CDN路由技术在响应延迟、可扩展性和可部署性方面进行分析比较,表明基于覆盖网络的内容路由技术充分利用现有的网络结构,具有响应延迟小、可扩展性高等优点,适用于大型CDN网站的部署建设.     

有关传销群体的数学描述

本文仅就传销群体服从齐次生灭过程,线性增灭过程的情形作了讨论。     

Analyzing and Designing Business Processes Management System Based on Transformation of Instantiated Ontology＇s State

The paper discusses efforts of finding a simple and transparent method to analyze business processes and developing its management system architecture. By introducing ontology and its state, the approach tried to find a unified representation and a flexible choreography of business processes. The main idea of the paper is the transformation of ontology＇s states, which are the most important scenarios of enterprises. The business activity composition, that is, case composition based on an AI technique, Case Based Reason （CBR）, which is to solve new problems by retrieving solutions to previous problems, and then store the modified solution. The main interest in CBR relies on that it allows a system to avoid past failures and exploit past successes.     

Climate change and hydrologic process response in the Tarim River Basin over the past 50 years

Climate change and hydrologic process response in the Tarim River Basin over the past 50 years are the focus of more and more researchers＇ attention. In this paper, both temperature and precipitation time series were found to present a monotonic increasing trend using nonparametric tests. Noticeably, a significant step change in both temperature and precipitation time series occurred in 1986. By contrasting the trends of natural water process in headstream and mainstream, we found that it was anthropogenic activities not climate change that caused the river dried up and vegetation degenerated in the lower reaches of Tarim River. The results of gray correlation analysis show that the runoff of higher latitude distributing river is more closely associated with winter snow stocking, while that of lower latitude is more closely related to summer temperature. Runoff in the headstream is more sensitive to precipitation, while that in the mainstream is more sensitive to evaporation. The strong evaporation caused by increasing temperature weakened runoff to some extent in spite of the fact that precipitation increased over the past 50 years.     

我国改革受阻深层原因分析

在改革过程中,我国利益表达主体多元化导致利益表达要求的多样性,利益表达客体角色错位引起利益表达信息的失真,利益表达能力的差异性及利益表达渠道畅通的有限性,利益表达效果与成本的不成比例性等,这些就是目前我国错综复杂的利益表达局面。它对处于攻坚阶段我国的改革产生一定阻力,并在一定程度上延缓了改革的进程。     

陕西省公路交通观测站现状评价

基于对陕西省现状交通量观测站布局状况所进行的全面分析,根据交通观测站的布设及实现的功能要求,提出了从宏观及微观两个层面的相关的评价指标,应用模糊综合评价法及层次分析法对其进行综合评价。根据评价结果可知,目前陕西省交通量观测站存在布局不均匀、代表性不足问题。并实现了量化评价交通观测站的功能及合理性的方法。     

基于模糊遗传算法的工业过程控制参数优化研究

针对复杂工业过程控制要求多样性、控制参数难调整的问题,提出了一种控制参数优化方法.其中,利用模糊评判方法设计了模糊适应度函数以改进标准遗传算法,把控制要求分解成多个对控制结果模糊评判的因素,由于其具有不同权重,因此控制结果与控制要求的接近程度就转化成了对遗传算法中个体(控制参数)的适应度.应用该算法优化了生物发酵罐温度控制器的控制参数,实验表明,控制器的控制精度、温度变化平稳性、能耗、电磁阀开关频率等指标均得到了改善,能够较好地解决复杂工业过程中控制参数优化的问题.     

土工格栅与膨胀土界面摩擦阻力系数试验研究

为满足土工合成材料在道路工程应用中的技术要求,开展了合理选取土工格栅与膨胀土界面摩擦阻力系数的研究.以正交设计原理为指导,选取筋土界面参数的4个影响因素(上覆压力、膨胀土体含水量、土工格栅尺寸和拉拔速度),进行了筋土界面摩擦阻力系数测试的拉拔试验.通过分析筋土界面各参数的影响因素,提出了当量拉拔位移的概念和筋土界面参数拉拔试验测试结果的过程分析方法,获取了各影响因素对摩擦阻力系数的影响程度及其在拉拔试验过程中的变化规律,并提出了拉拔试验的测试要求、步骤和结束标准.     

Banach空间中增生型变分包含解的具误差的Ishikava序列逼近问题

在Banach空间中研究一类增生型变分包含解的存在性及其具误差的Ishikava迭代程序的收敛性问题,对文献中相应结果进行了改进与推广.