T接输电线路故障测距的行波算法

针对T接输电线路故障测距问题,将行波故障测距方法应用于T接输电线路故障.首先进行故障分支的判定,其次,把复杂的三端输电线路通过运算化简为比较简单的双端输电线路,然后利用双端行波故障测距的方法进行故障测距,得到故障的位置.同时在行波测距装置中增加行波波形记忆模块、使用较高的采样精度,确保双端行波测距的可行性.     

Effect of injection of di- and tricyclic aromatic compounds on post-combustion formation of polychlorinated dibenzo-p-dioxins and dibenzofurans

The formation of mono- to octachlorinated dibenzo-p-dioxins (PC_1-8DD) and dibenzofurans (PC_1-8DF) was studied using a model waste in a laboratory-scale combustion reactor with simultaneous collection of flue gas at three different temperatures (450 °C, 300 °C, and 200 °C) in the post-combustion zone. To investigate the influence of chlorination reactions and the effects of carbon backbone-containing compounds present in the flue gases, five aromatic compounds were injected into the flue gas, namely dibenzofuran (DF), biphenyl (BP), naphthalene, phenanthrene and fluorene. The injection of DF induced a reduction in the concentration of PC_3-5DD, but did not significantly influence the concentration of PCDF. A reduction in the concentration of PC_3-5DD was also observed during the injection of fluorene, which is structurally very similar to DF. The injection of biphenyl, naphthalene and phenanthrene had less pronounced effects on the formation of PCDD and PCDF.A possible explanation of the observed changes during injection of DF and fluorene, based on homologue profiles and affected congeners, involves formation of radical species from fluorene and/or dibenzofuran. The fluorene radical is stabilized by the delocalization of electrons across the aromatic ring structure and has the propensity to react with highly abundant hydrogen chloride, whereas the molecular species would require reaction with Cl₂ or chlorine radicals.     

论词汇揭义的三要点

本文指出词汇揭义在词汇教学中的重要性,以语义学理论和外语教学实践为依据提出词汇揭义的三个要点——Conceptual　meaning,Collocation,Equivalency     

Validation de la version canadienne-fran?aise du Life Orientation Test-Revised.

The "Life Orientation Test-Revised" (LOT-R) is used to evaluate the personal disposition toward optimism. Since the test is written in English and based on an American population, it cannot be used to conduct research on optimism with the French-Canadian population. Thus, following a translation of the LOT-R into French and a subsequent evaluation of its cross-cultural equivalence, the French-Canadian version of the LOT-R was administered to 204 francophone university students. The internal consistency was .76, a result that is deemed satisfactory and comparable to the internal consistency score of .78 obtained by Scheier et al. A test-retest score after 5 weeks revealed a highly acceptable temporal stability score of .74 (p     

二进制翻译技术研究综述

随着信息技术的快速发展,涌现出各种新型处理器体系结构.新的体系结构出现为处理器多样化发展带来机遇的同时也提出了巨大挑战,需要兼容运行已有软件,确保较为丰富的软件生态群.但要在短期内从源码编译构建大量生态软件并非易事,二进制翻译作为一种直接从二进制层面迁移可执行代码技术,支持跨平台软件兼容运行,既扩大了软件生态群,又有效降低了应用程序与硬件之间的耦合度.近年来,二进制翻译技术研究取得了较大进展.为总结现有成果并分析存在的不足,本文首先介绍了二进制翻译技术的分类以及典型的二进制翻译系统,之后从指令翻译方法、关键问题研究、优化技术等方面分别进行分析总结,接着阐述了二进制翻译技术的核心应用领域,最后对二进制翻译技术的潜在研究方向进行展望.     

浅水爆炸对破坏半径的影响

水中兵器装药在离水面比较近处爆炸，由于自由面的影响，其装药的有效破坏半径减小，毁伤效能降低。现采用1kgTNT当量药包，进行浅水爆炸试验；应用最小二乘法、冲量等效、能量等效方式处理p（t）关系式，得到二种有效破坏半径的计算公式：Rs＝0．7636R＋0．2603H；Rs＝0．9301R＋0．1047H。     

惯性质量和引力质量的等效性应当进一步认识

惯性质量和引力质量的等效性是广义相对性公設的一个重要论据。在经典力学中,一般不去严格区分这两个质量的概念,也是建立在两种质量的等效性上。所以,长期以来,人们总是小心翼翼地去证实它,并且取得了很好的实验結果。本文作者认为,这些验证工作并沒有涉及到惯性质量和引力质量的本质及其内在联系,许多问题,特別是在相对论情况下出现的问题,都有待我们进一步去认识。本文还介绍和討论了D.W.Olson的工作和Ephraim Fischbach的工作。     

Introducing Wpt (Waypoint): A color equivalency representation for defining a material adjustment transform

The basis of this research is the manipulation of sensor excitation values to account for differences in observer or illuminant when spectral data are unknown. This touches on several related topics: color constancy, chromatic adaptation, and white balancing. The central premise is that these concepts make use of some form of intermediate color equivalency representation or waypoint system that makes comparison and color transformations possible. Differences between these concepts are related to the kind of color equivalency representation system used and how transformations are made into and out of it. A new sensor excitation normalization method was derived that has been optimized to predict changes in material color as Wpt (pronounced Waypoint) coordinates, which can be used to form a material adjustment transform. The prediction of such changes is also known as least dissimilar color matching. This is contrasted with a chromatic adaptation transform, which is optimized to predict corresponding color changes. As such a distinction is made between adaptation (which is based on corresponding color) and adjustment (which is based on other criteria). © 2014 Wiley Periodicals, Inc. Col Res Appl, 40, 535–549, 2015     

数据仓库设计中低粒度数据的分割策略研究

数据仓库中存在着巨大容量的低粒度数据，其存储策略的好坏直接影响到联机分析处理和数据挖掘的性能及效率。该文分析了数据仓库系统中数据分割的一般原则，详细论述了静态数据分割的各种策略，并对结构和内容两个方面的变化所引起的动态数据分割策略进行了详细研究，提出了基于属性相容和属性语义等价的动态数据分割技术。     

平面编织复合材料层板弹性性能的预测

本文在平面编织纤维增强树脂复合材料的单方向直波纹模型的基础上,分别采用经典层合板理论和有限元应变能等效方法,预测了平面编织复合材料层合板迭层对其弹性性能的影响。根据经典层合板理论,由对平面织物复合材料的单向直纹模型的上、下表面施加不同的约束条件,得出层板弹性常数变化范围。用有限元能量法,则预测出不同铺层数的编织复合材料层板的弹性性能。与实验结果比较,表明纵向模量的预测是可靠的。