Experimental and theoretical investigations of drainage in horizontal rough-walled fractures with different correlation structures

Experiments on the immiscible displacement of water by air were performed in two horizontal artificial open rough-walled fractures with different correlation structures. The aperture field of the first fracture has a Gaussian variogram with a finite correlation length, while that of the second one has a power-law variogram, for which no finite correlation length can be assigned. We simulated the displacement process using an invasion percolation model, which takes the in-plane curvature of the interface between water and air into account. The correlation structure of the aperture field has no effect on the irregularity of the shape of the air clusters. However, the correlation structure in combination with the in-plane curvature influences the density of the air clusters and thus has an impact on characteristic properties of the flow. We analyze the model parameters and properties with respect to the fracture properties. The stochastic average of the air clusters for models with different curvature numbers and fields with different correlation lengths is then calculated in order to analyze their influence on continuum approach models.     

遗传神经网络测井解释技术在宝北区块的应用初探

将遗传算法与人工神经网络(BP网络)的原理结合,对BP网络进行了改进,提高了收敛速度,并防止陷入局部极小。应用改进后的BP算法,建立了针对测井解释的神经网络模型,并应用此模型定量计算了宝北区块的多口井的渗透率值,其解释结果及精度均令人满意。     

基于移动Agent的分布式地理信息检索系统研究

如何从海量的空间信息中快速准确地找出用户感兴趣的信息,是地理信息空间检索服务所要解决的主要问题。为此,本文提出了一种基于移动Agent的分布式地理信息检索框架,并对其中的关键技术进行了研究。移动Agent技术的引入使得空间检索更加智能化,能有效解决网络带宽问题和离线计算问题,同时极大地提高了检索效率,为分布式GIS系统建设提供了一种新的思路和解决方法。     

面向叙事结构的地理空间情报可视分析方法

以地理空间情报服务于反恐为需求牵引,采用全球恐怖主义数据库(GTD)为数据源,将时空叙事结构作为分析模型,以时间要素和空间要素作为线索,进行地理空间叙事,对事件和对象的多维属性进行可视化,借助多视图人机交互式分析方法和交互技术,构建了基于JavaScript的地理空间情报可视分析平台,并根据分析任务进行了案例分析,为基于活动的地理空间情报研究探索一条新的思路。     

The stability and reproducibility of Tris buffers in synthetic seawater

The equimolal Tris buffer (0.04 mol/kg-H₂O Tris + 0.04 mol/kg-H₂O Tris-HCl) prepared in synthetic seawater of salinity 35 has been shown to be stable when sealed in a borosilicate glass bottle with a greased ground-glass stopper (drift rate ≤ 0.0005 in pH per year). The error in pH of such buffers resulting from uncertainties in the preparation of such buffers is typically less than 0.002 in pH (relative to the results of DelValls and Dickson, 1998 [DelValls, T.A., Dickson, A.G., 1998. The pH of buffers based on 2-amino-2-hydroxymethyl-1,3-propanediol (‘tris’) in synthetic sea water. Deep-Sea Research I, 45, 1541–1554]).     

干湿表法测湿的实时性处理

用单片微机，采用洛氏（Ｌｏｗｅ）多项式和高级编译程序，对干湿表法测湿进行了实时性和智能化处理。使干湿法测湿具有了更广泛的实用价值．     

Simulation of Wave Forces on A Semi-Circular Breakwater Using Multilayer Feed Forward Network

1 .IntroductionTheartificialneuralnetwork(ANN)hasbeenwidelyusedinmanyscientificfieldsinrecentyears .Itisakindofinformationmanagementsystemthatresemblesthehumanbraininworkpattern .Comparedwiththetraditionalmethodsofnumericalsimulation ,ANNhastheadvantagesofrelativein dependenceofphysicalmodel,uniformandsimplewayofrealization ,quicknessofcomputing ,andsoon .Sincethemodelofartificialneuronswasfirstlyintroducedin 1 943,ithasbeendevelopedthroughseveralstages.TheapplicationofANNhadnotbeenpopular…     

CHIMEHERB人工皮治疗烧伤临床总结

用青岛海洋大学生物材料研究所研制、海威生物材料有限公司生产的CHIMEHERB人工皮治疗烧伤50例.其中用于切、削痂创面10例,Ⅲ°创面20例,肉芽创面12例,供皮区创面3例.削痂创面一次覆盖面积最大23％,切痂创面13％.人工皮下可移植点状小皮片,亦可移植微粒皮,是一种较好的覆盖创面的生物材料.治疗浅Ⅱ°烧伤可使创面愈合时间提前2～4d(天);用于深Ⅱ°创面愈合时间为19～21d.人工皮治疗Ⅱ°创面,最大贴敷面积为60％.它对烧伤肉芽创面有促进周围上皮生长加速创面愈合的作用.     

人工智能技术在热带气旋预报中的应用--台风预报专家系统的设计与实现

随着人工智能技术的发展，使得利用计算机的高速度、高效率、高准确度等优点，结合人工预报天气的思维过程，进行智能化天气预报成为可能。台风预报专家系统就是一个成功的应用，本文对我们进行台风预报的方法进行了阐述，并详细介绍了该专家系统的设计和实现方法。实践表明，台风专家系统预报准确，具有很高的应用价值。