水污染扩散模拟三维可视化研究

分析了基于二维图像的水污染模型计算结果可视化不足--脱离地形地貌环境、缺乏空间定位信息,提出基于虚拟现实的水污染扩散模拟三维可视化方法,讨论了数据组织与压缩、仿真模型与可视化一体化集成、查询统计等关键技术,对长江三峡库区万州段污染物迁移转化过程进行了动态模拟.结论表明,该方法形象直观地展现了水污染扩散推进三维效果,为检验污染模型的准确性提供了参考和依据,也为水环境综合整治与管理走向定量化、科学化提供了一种崭新的思路和可靠的技术支持.     

水相作用下填埋气体迁移数值仿真及参数灵敏性研究

垃圾填埋气体(LFG)的资源化利用作为控制其对周围环境污染的有效手段已得到了越来越广泛的关注。填埋气体的迁移过程是一种伴随多相多组分的非稳态渗流问题。将垃圾填埋场视为非饱和传输介质,建立了描述填埋气体迁移演化的气-水两相耦合数值模型。数值仿真结果表明:垃圾存放的年份越久,产量下降越缓慢。封场a年与封场b年后产量的比值同气体压力比值基本相同;随着饱和度(Sw)的增加,气体产量呈下降趋势。因此,在预测抽气量的过程不能忽略水相饱和度;提高固有渗透率(k)后气相压力梯度增大,气体的传输路径变宽,同时,填埋气体流速加快,导致气体的产量的增加。因此,在预测注井抽气状态下填埋气体的压力及产量分布时以及对填埋气体收集系统设计时,对气体传输参数进行灵敏性分析具有重要意义。     

从《聊斋志异·贾儿》看母子关系

以弗洛伊德、拉康为代表的精神分析关于母子关系的理论对《聊斋志异·贾儿》进行重新阅读分析,认为贾儿与狐狸的正面冲突实际上体现着他与母亲之间微妙而复杂的关系。贾儿与贾人妇都有着某种试图回复到母子一体的前俄底普斯期的冲动,这在文中表现为贾人妇将讨狐的厚望寄予给贾儿,而贾儿也用尽心计击毙了满足母亲女性欲望的狐男;不过在母子乱伦禁忌的限制下,贾人妇最终以疯癫的形式将其欲望指向了狐狸。     

天文公共选修课教学的一点体会

讨论了天文公共选修课的教学特点,认为当前的天文选修课要有时代气息,即选修课教学要和科学研究紧密结合,要与其他学科相结合,教学手段要传统手段和现代手段相结合.     

多目标规划的几种稳定性

改进了已有的多目标规划在弱有效解意义下强稳定的充分条件，并给出了多目标规划弱有效解最强稳定的一个充分条件，最后讨论了弱有效解的几种稳定性     

A new approach to isotonic agglomerative hierarchical clustering

Hierarchical clustering methods must be isotonic for the construction of ultrametric. We present a general strategy to widen the class of isotonic methods implemented by agglomerative algorithms. At each step of the agglomeration we allow one of several admissible pairs to be chosen. Then under mild assumptions an appropriate definition of admissibility guarantees isotony. Moreover we consider the use of the new methods to compute locally optimal ultrametrics. Two examples demonstrate the ability to define new agglomerative methods superior to their traditional competitors.     

The uses and abuses of ‘consensus’ forecasts

Clemen's (1989) review of the forecast-combining literature amply illustrates both the interest in and the importance of this subject. This article stresses the tautological properties of various consensus measures that assure their success relative to most individual forecasts. It confirms the finding of earlier studies that for each specific macroeconomic variable roughly one-third of individual forecasters are more accurate than a consensus. However, each individual does relatively poorly for some variable while the consensus, in contrast, necessarily never fails relative to most individuals. These results, like most previous studies, describe consensus measures that are synthetic constructs derived from a pre-existing set of individual forecasts. Strictly speaking, this contemporaneous consensus is not available to individual forecasters when their forecasts are made. A prior consensus measure, which is in their information sets, was relatively much less accurate than the contemporaneous measure. Nevertheless, a small subset of individual forecasters were generally inferior to the known, prior consensus forecast.     

转炉除尘水用于模拟含硫烟气脱硫的实验研究

本文进行了转炉除尘水脱除模拟含硫烟气中二氧化硫的实验研究。通过连续实验考察了pH值、Fe2 浓度以及脱硫率等的变化规律并对FeO溶出率进行了测定;通过模拟实验发现,保持除尘水更新率4%.min-1左右可以使除尘水pH值稳定在5～6.5之间;在参数优化的条件下用转炉除尘水进行模拟烟气脱硫,可以实现90%以上的脱硫率和相对稳定的Fe离子浓度和pH值.实验研究结果为转炉除尘水脱除钢铁联合企业烧结机所排烟气中二氧化硫的工业应用奠定了良好的基础.     

高校旅游人才供需失衡分析--以江苏为例

旅游业人才需求空间巨大，然而高校旅游人才行业的流失率却居高不下，供需矛盾凸显，本文以江苏为例，通过抽样调查，分析得出学生期望的薪酬与企业成本因素、个人发展与企业发展失调、企业期望学生具备的知识结构、工作经验、能力与实际的差异是供需错位问题的主要因素，在此基础上提出相应的对策建议。