一种基于同义词词林的中文大规模本体映射方案

本体映射是解决本体异构问题的重要途径和手段,中文知识是网络开放知识库的重要组成部分,但现有的中文本体映射系统在面对大规模本体映射任务时,显得效率较低且可用性不高,目前仍缺乏针对中文大规模本体映射的相关系统。为了解决中文大规模本体的映射问题,设计并实现了一个面向中文的大规模本体映射系统。首先,提出了一种基于拟核力场势函数的大规模本体压缩方法;其次,提出了一种基于同义词词林的中文概念等价关系确定算法;再次,实现了大规模中文本体映射的原型系统;最后,将本系统与相似度计算相关典型算法进行比较,证明其具备一定的可用性和较高的总体性能。     

N-十六烷基乙二胺三乙酸钠的合成及性能

用无水乙二胺、1-溴-十六烷和氯乙酸为原料,合成N-十六烷基乙二胺三乙酸钠,以提高阴离子表面活性剂在硬水中的稳定性。性能研究表明:它在硬水中的稳定性达到4级,cmc为2 13mmol·dm-3,γcmc=34.7mN·m-1。对产物的润湿力、分散力、乳化力等其他性能也进行了研究。     

基于语义分类的比较句识别与比较要素抽取研究

比较是人们常用的评估不同事物优劣、异同的表达方式,利用机器识别比较句并进一步抽取比较要素是语言信息处理领域一项新颖又有实用价值的课题。该文依据比较句与比较要素之间是一种“你中有我,我中有你”的共生关系,将比较句识别与比较要素抽取两个任务合二为一完成;根据词意分类,构建由领域词典、情感词典、标记词典、普通词典构成的词典系统;根据汉语比较句句义分类,构建比较句识别与比较要素抽取规则库。以第四届中文倾向性评测(COAE2012)发布的测试语料为实验对象,该系统取得了较好的实验(评测)结果。     

On the mechanisms for drag reduction: A viscoelastic evaluation based on a bead-spring model

Two possible drag reduction mechanisms were examined by studying the viscoelastic effects of polymer solutions for the separate cases of oscillatory shear flow and elongational flow. The constitutive equation used was based on a modified dumbbell molecular model which predicts non-Newtonian viscosity and both the primary and the secondary normal stress differences. It can be shown that when this constitutive equation is arranged in the form of the Oldroyd model, the latter becomes a special case of this more general equation. The present results show that viscoelastic effects on the mean local rate of energy dissipation of a fluid element in an oscillatory motion are negligibly small. However, such effects introduce very large increases in the elongational viscosity as the stretching rate exceeds a certain limiting value and the flow time exceeds the terminal relaxation time of the fluid. The relative merits of these findings as possible explanations of turbulent drag reduction are briefly discussed.     

HZSM-5型分子筛催化乙醇溶液脱水制备乙烯的工艺

以稀乙醇溶液为原料、自制分子筛HZSM-5为催化剂,催化脱水制备乙烯.考察了硅铝比、反应温度、质量空速及乙醇的质量浓度对该反应的影响,得到了较优化的反应工艺条件为:催化剂为HZSM-5(硅铝比30)分子筛,ρ(乙醇)为100~200 g/L,质量空速为2~6 h-1,反应温度为300℃.乙醇的转化率可达99%,乙烯的选择性达99%以上.     

Morphology and characterization of conductive films based on polyaniline‐coated polystyrene latexes

The polyaniline (PANI)‐coated polystyrene (PS) latexes were synthesized, and the electrically conductive films were prepared thereafter. The weight ratio of PANI was 5%. Thermal analysis of the latices was performed using DSC and TGA. In this study, the electrically conductive films were prepared above the PS glass transition temperature (T_g). During the film formation, the effects of the annealing temperature and atmosphere (air or N₂) on the film resistance were investigated. In addition, the film morphology was observed utilizing scanning electron microscopy. The film resistance decreased in the initial heating stage due to the increasing temperature and the compaction of film. Then the film resistance increased with further annealing due to the aging of PANI. Typically, the film resistance was about 6000 Ω/sq, and the conductivity was 0.3 S/cm. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 5406–5413, 2006     

软件安全性检测技术综述

该文阐述了网络软件安全检测的重要性,介绍了现有的主要检测方法,包括形式化安全测试、基于模型的安全功能测试、语法测试、基于故障注入的安全测试、基于属性的测试、模糊测试、基于风险的安全性测试、基于故障树的安全性测试以及基于渗透的安全性测试。     

基于QT的跨平台网络通信的设计与实现

本文介绍了使用心跳信号来保持网络自动重连的方法,并使用优秀的跨平台QT C＋＋库实现,使得本模型可用于任何操作系统平台下,不仅提高了网络的可靠性,更大大提高了程序移植性.是服务器与客户端之间网络通信的一种良好的解决方案.     

N-十六烷基乙二胺二乙酸钠的合成及性能研究

采用大量无水乙二胺与1－Br－十六烷反应合成N－十六烷基乙二胺，然后与过量氯乙酸作用制备N－十六烷基乙二胺二乙酸，用NaOH中和，即得N－十六烷基乙二胺二乙酸钠。该产物在硬水中的差示稳定性为333，优于LAS。在相同测试条件下，产物的去污力高于LAS，发泡力明显低于LAS。     

测井相在核三段沉积微相分析中的应用

综合测井曲线等资料对泌阳凹陷南部核三段沉积微相进行研究。泌阳凹陷南部核三段的平原亚相主要由泥石流沉积、水上分流河道及漫流沉积构成,其中水上分流河道沉积发育较好。扇三角洲前缘亚相主要由碎屑流沉积、水下分流河道沉积、河口砂坝和水下分流河道间组成。前扇三角泥为深灰色及灰黑色泥岩、砂质泥岩、粉砂岩,见水平层理和植物碎屑。