特殊非牛顿原油水驱开发渗流规律数值模拟方法研究

在水驱油过程中非牛顿原油的视黏度受压力梯度影响,不同压力梯度区间内其变化规律不同。为了理清非牛顿型原油黏度变化及其对渗流特征和水驱规律的影响,以胜利油区孤岛油田水驱稠油为例,结合该油田流变性实验数据,针对流动规律不同于幂律流体及宾汉流体的特殊非牛顿原油,建立了三段式原油视黏度数学表征模型。运用非线性渗流理论和计算机计算技术,在考虑其黏度随压力梯度的特殊变化关系的基础上,建立了二维油水两相渗流数学模型,并采用有限差分方法进行了求解,且研制了相应的油藏数值模拟软件。构建并模拟了水驱不同性质原油的算例,对4种类型原油的模拟结果表明:生产1 000 d时,水驱牛顿原油采油井含水率为93.7%,其他3种非牛顿原油油井含水率分别为91.2%、88.1%和89.8%。水驱牛顿和非牛顿型原油的油井含水率、压力、黏度分布和水驱前缘均有明显的差异。本方法为更准确模拟和预测非牛顿型稠油油藏水驱开发提供了手段。     

由“软实力”引发的对期刊影响力的思考

由对美国哈佛大学教授约瑟夫·奈（Joseph Nye）国策辩论中提出的“软实力”（Soft Power）理论的界定及结合美国《时代》周刊办刊的成功经验的分析探讨，认为可借鉴“软实力”理论来拓展我国期刊传播力和影响力的研究思路，促进期刊所载信息提升传播力和影响力．     

强磁场中氢原子基态和激发态能级的变分计算

采用Ｂａｙｅ和Ｖｉｎｃｋｅ柱对称性有限基矢集，对其变分参数的选取作了扩充和改进，应用变分法求得强磁场（Ｂ＞１０５Ｔ）中氢原子的基态和第一激发态能级值，与已有最好的数值计算结果精度相近，但文中采用的基矢集相对简单，不但结果容易重复，而且可以得到十分有用的基态和激发态波函数     

模糊聚类分析在郁金香品种间生理差异研究中的应用

郁金香１０个品种从现蕾前期开始的各生育期对其净光合作用（ＮＰ），蒸藤作用（ＴＲ），气孔阻力（ＲＳ）以及叶内ＣＯ２的浓度（ＣＩＮＴ）等光合参数进行了系统的测定，结果表明，某些品种在生理上有相似的特性，而另一些品种间在生理上存在显著的差异，光合生理特征上的相似或相异，显示它们对环境条件有相同或不同需求，采用模糊聚类分析法将入试品种按生理特性划分成三大类：第一大类具有花期早，ＮＰ和ＴＲ较高，ＲＳ和ＣＩＮ     

Study on Variation of Parameters Formula and Stability for Impulsive Time－Delay Nonlinear Large Scale Systems

ＳｔｕｄｙｏｎＶａｒｉａｔｉｏｎｏｆＰａｒａｍｅｔｅｒｓＦｏｒｍｕｌａａｎｄＳｔａｂｉｌｉｔｙｆｏｒＩｍｐｕｌｓｉｖｅＴｉｍｅ－ＤｅｌａｙＮｏｎｌｉｎｅａｒＬａｒｇｅＳｃａｌｅＳｙｓｔｅｍｓＧＵＡＮＺｈｉｈｏｎｇ（Ｄｅｐｔ．ｏｆＢａｓｉｃＳｃｉｅｎｃ...     

Progress in molecular parasitology

Summary Substantial progress has been made in the last ten years in understanding the structural and functional organization of parasitic protozoa and helminths and the complex physiological relationships that exist between these organisms and their hosts. By employing the new powerful techniques of biochemistry, molecular biology and immunology the genomic organization in parasites, the molecular basis of parasite's variation in surface antigens and the biosynthesis, processing, transport and membrane anchoring of these and other surface proteins were extensively investigated. Significant advances have also been made in our knowledge of the specific and often peculiar strategies of intermediary metabolism, cell compartmentation, the role of oxygen for parasites and the mechanisms of antiparasitic drug action. Further major fields of interest are currently the complex processes which enables parasites to evade the host's immune defense system and other mechanisms which have resulted in the specific adaptations which enabled parasites to survive within their host environments. Various approaches in molecular and biochemical parasitology and in immunoparasitology have been proven to be of high potential for serodiagnosis, immunoprophylaxis and drug design.This paper is based on a review presented at a workshop on Molecular Parasitology, organized by the Swiss Society of Tropical Medecine and Parasitology at the University of Neuchâtel, March 1985.     

网络环境下高校图书馆的期刊服务

本文分析了网络环境下高校图书馆期刊服务的变化,以及网络环境下高校图书馆期刊服务的创新。     

放矿动力学方程初探

在分析放矿过程中矿岩移动规律的基础上,提出了流动体和固结体概念。建立了矿岩块体力学模型和相应的动力学方程,应用变分原理推导出块体运动轨迹和确定流动体形状,从理论上探讨放矿动力学过程取得了新的进展。     

Edaphic factors determining variation of two ecotypes of Leymus chinensis in North China

To identify ecotypic variation of L. chinensis, the physiological characteristics and environmental factors were measured and assessed for grey-green and yellow-green ecotypes of L. chinensis grown in the salt-alkalized and aeolian sandy soils. Although both ecotypes presented a similar salt-alkaline tolerance under the experimental conditions, they differed in several aspects. The L. chinensis grown in the aeolian sandy soils had higher water potential and chlorophyll content and lower proline content in their leaves than those grown in the salt-alkalized habitat, and the grey-green ecotype of L. chinensis in both types of soils had higher water potential, chlorophyll and proline contents than the yellow-green ecotype. Besides, grey-green ecotypes had higher salt-alkaline tolerance than the yellow-green ecotype. The stepwise regression analysis showed that soil conductance and pH value were the main ecological factors affecting the physiology of L. chinensis. From the natural distribution of the two ecotypes, we considered that salt-alkaline in the soils is the leading factor in determining ecotypic variation of L. chinensis. The two ecotypes were first named grey-green and yellow-green ecotypes respectively.     

现代主义小说与后现代主义小说之比较

后现代主义小说不仅颠覆了传统小说的内部结构 ,而且对小说这一形式和叙述本身进行反思、解构和颠覆。后现代主义小说与现代主义小说的区别主要表现在 :打破了美与丑 ,文学与非文学 ,能指和所指的界限。但二者之间的关系并非泾渭分明、清晰可辨 ,而是既异中有同 ,也同中有异