鲁古河水库供水工程对水源区水环境影响分析

以鲁古河水库供水工程为例,采用"湖泊完全混合衰减模式"进行水质预测,分析工程引水后,鲁古河水库水量减少水环境容量降低可能对库内水质及下游河道用水产生的影响。预测结果表明调水后鲁古河库内BOD和氨氮增幅较小,污染物浓度可达到水质标准要求,引水后不会对下游用水量和水质产生影响。     

Discovering social structures of local influence by using tweetStimuli

Information diffusion in large-scale networks has been studied to identify the users influence. The influence has been targeted as a key feature either to reach large populations or influencing public opinion. Through the use of micro-blogs, such as Twitter, global influencers have been identified and ranked based on message propagation (retweets). In this paper, a new application is presented, which allows to find first and classify then the local influence on Twitter: who have influenced you and who have been influenced by you. Until now, social structures of tweets’ original authors that have been either retweeted or marked as favourites are unobservable. Throughout this application, these structures can be discovered and they reveal the existence of communities formed by users of similar profile (that are connected among them) interrelated with other similar profile users’ communities.     

长江口不同河段表层细颗粒泥沙絮凝特性

利用长江口的现场观测资料分析河口不同区段表层细颗粒泥沙絮凝特性及其影响因素。结果表明:在河口上段水域,流速对絮凝表现为破坏作用,盐度是"制约"条件,流速和浊度对絮团影响明显,絮团平均粒径约为40.69mm,是分散粒径的4倍左右;口门最大浑浊带水域絮团峰值出现在憩流或者中等流速处,高盐度抑制、低盐度促进絮团生长,小潮时流速影响最明显、大潮时则是盐度,絮团平均粒径小潮为28.54mm、大潮35.17mm,是分散粒径2~3倍左右;北港口外,絮团生长或者破碎频繁,流速表现出促进作用,盐度有抑制作用,盐度对絮团影响最大,絮团平均粒径约为110.36mm,是分散粒径的18倍左右。     

Toughness Optimization of SBR Elastomers – Use of Fracture Mechanics Methods for Characterization

Elastomer materials are used in a wide application range and subjected to different loading from which failure of the material results. Because this failure is caused by initiation and propagation of cracks, the application of fracture mechanics methods for the assessment of the material is obvious. A short summary of the methods of technical fracture mechanics including possibilities of determination of crack resistance curves is given. Vulcanizates on the basis of SBR 1500 with various sulfur and carbon black contents were investigated. For describing the crack initiation and crack propagation behavior, several fracture mechanics examination methods were applied. Tear‐analyzer results were used to assess the crack propagation behavior under fatigue‐like loading conditions. Furthermore, for the characterization of the crack resistance of the materials under impact‐like loading conditions, instrumented tensile‐impact tests were performed. To obtain information about the initiation and propagation of a stable crack, quasi‐static fracture mechanics tests were applied. The results of the several tests are discussed in dependence on sulfur and carbon black contents. We found a non‐monotonous behavior of the toughness as a function of carbon black loading. An explanation is given in connection with a percolation‐like transition in filler morphology on larger length scales.

Schematic crack propagation curve for characterizing the fatigue behavior of the vulcanizates recorded in a TFA test.     

面向图像局部重建的梯度分析

在基于场方向导数的图像局部区域重建过程中,梯度计算对图像边缘的重建效果有很大影响。分析选择单向计算梯度分量的必要性,提出梯度计算的就近原则,对参与梯度分量单向计算的相邻点设置优先级,将缺损点与已知点之间的边缘特征反映在已知点的梯度中,进而影响重建过程,从而实现对图像中边缘特征的重建。实验结果表明,采用该梯度计算模式能有效改善对图像边缘特征的重建效果。     

宏应用遇到的问题及解决办法

本文指出了在Microsoft Word2002/2003中用宏录制器录制宏遇到的几个问题,并给出相应的解决办法。其中对宏无法实现将中文设置为指定的目标中文字体,用录制前将光标定位在指定字体的文本中及录制后修改代码的方法解决。     

均三甲苯氧化合成间二甲基苯甲酸的宏观动力学

研究了由均三甲苯液相富氧催化氧化制备间二甲基苯甲酸的动力学规律 ,考察了反应时间、温度、通气量和氧浓度等因素对均三甲苯和间二甲基苯甲酸浓度的影响 ,根据双膜理论建立了该反应的宏观动力学模型 ,并由实验数据拟合出模型参数 ,经检验模型计算值能较好地与实验数据相吻合     

渠道基础处理工程砂石挤密桩施工技术

砂石挤密桩是饱和地震液化砂土基础处理的一种方法,结合南水北调中线工程温博段的工程实际,叙述了砂石挤密桩的工艺原理和施工方法.     

湿法烟气脱硫去掉GGH对脱硫系统的影响分析及解决对策

主要介绍了烟气脱硫GGH运行现状,分析了去掉GGH后对脱硫系统的影响,着重提出了去掉GGH后的解决对策,对于脱硫工程的改造具有重要的参考意义。     

焦作某铝厂赤泥堆场工程防渗对地下水水质的影响

根据堆放场底部铺设赤泥加石灰垫层和防渗膜的工程防渗处理措施,探讨了赤泥渗滤液的日实际渗透量以及该区域地下水对赤泥渗滤液的日最大允许入渗量。讨论了该防渗情况下,堆放场对周围地下水水质的影响。