钛石膏作水泥缓凝剂的试验研究

试验了钛石膏中亚铁含量对水泥性能的影响，并检测了用处理后的钛石膏作缓凝剂的水泥物理性能及所配混凝土的收缩值，结果表明，掺钛石膏的水泥与掺天然石膏的水泥标准稠度用水量、凝结时间基本一致；钛石膏的掺量达4％～7％时，水泥的各龄期强度均比掺天然石膏的高；所配混凝土的收缩值基本相同。并进行了大磨中试，表明处理后的钛石膏完全可以代替天然石膏作水泥缓凝剂。     

江西于都琉璃釉资源评价

本文从资源概况、琉璃釉工艺特征和应用效果等方面对江西于都发现的天然黄绿色琉璃釉资源进行了初步评价。     

Surface properties of surfactants derived from natural products. Part 1: Syntheses and structure/property relationships—Solubility and emulsification

Several novel and some previously known, mostly sugar-based, surfactants have been synthesized and some of their surface properties have been characterized and compared with those of commercial nonylphenol ethoxylates. The surfactant solubility in water, ethanol, and dodecane was studied. The properties of these compounds as emulsification agents in systems composed of the surfactant with water/isopropyl myristate, water/rapeseed oil, and water/dodecane are presented. The aqueous solubility of the surfactants follows the general trend expected from their hydrophilic-lipophilic balance according to Griffin (HLBG), but it is also clear that the nature of the headgroup and the structure of the nonpolar part affect the solubility in a manner not aptured in the standard HLBG concept. An ester or amine group as the connecting unit between the hydrophile and the hydrophobe produces a more water-soluble surfactant than the corresponding amide derivative. Some effective emulsifiers were found. For instance, the surfactants with a dehydroabietic nonpolar group appear to be promosing emulsifiers. Most sugar-based surfactants were able to form macroemulsions of up to around 2 wt/vol% of oil. The stability of many of these amulsions was very high, extending for months.     

供电企业配电线路故障及策略

通过分析供电线路安全运行的影响因素,提出了防范故障的策略,希望能够对配电线路的安全运行提供帮助。     

水蓄冷运行控制分析

随着空调蓄冷技术的不断发展,它已逐渐在节能效果、经济效益和社会效益等方面展现出强大的生命力和广阔的市场。主要探讨了自然分层蓄冷形式,该方式利用温度和密度不同的原理,通过斜温层分隔高、低温水。必须严格进行水蓄冷系统的运行控制,否则极易打破其自然分层的规律。     

以天然产物为先导化合物开发的农药品种(Ⅰ)--杀菌剂

研究天然产物的重点不是直接利用它，而是以其为先导化舍物开发活性更优的天然产物替代品。只有如此，才能保护有限的资源，更好的为人类持续发展服务。在农药创制研究中以天然产物为先导化合物进行研究、开发新农药品种的方法仍将是一种有效的方法；因为以具有活性的天然产物为先导化合物不仅可以更快、更经济的发现活性更优的类似物，而且因其内在的性能是产品更易符合环境保护与持续发展之需要。本文概述了以天然产物为先导化合物进行的新农药创制研究以及开发的农药品种，其中杀菌剂包括乙蒜素、稻瘟灵、恶霉灵、肉桂酸衍生物、吡咯类化合物、甲氧基丙烯酸酯类等。旨在吸取他人成功经验，利用其研究之成果研制我们自己的新农药品种。     

Mechanical properties and crosslink density of rare earth‐modified high‐abrasion furnace‐filled powdered natural rubber

High‐abrasion furnace‐filled powdered natural rubber [P(NR/HAF)] has more advantages than traditional HAF‐filled bale NR (NR/HAF) because of its better environmental performance and easier processing quality, but its lower mechanical properties are disadvantageous. To improve the mechanical properties, rare earth‐modified HAF‐filled powdered NR [P(NR/HAF‐Ln)] (Ln = Sm,La,Pr) was prepared by means of coacervation–coprecipitation, using rare earth‐modified HAF as separant and filler. The effect on mechanical properties of P(NR/HAF‐Ln) vulcanizate exerted by the emulsifier/HAF ratio, powdering temperature, Ln/HAF ratio and type of Ln, and HAF content were studied. The results indicated that when optimum formulation, the mechanical properties of P(NR/HAF‐Ln) vulcanizate were better than P(NR/HAF) vulcanizate. In addition, the relationship of the apparent crosslink density and HAF content of P(NR/HAF‐Ln), P(NR/HAF), NR/HAF vulcanizates was also investigated, along with their SEM microphotographs of tensile fracture surface, which indicated that the excellent mechanical properties of P(NR/HAF‐Ln) vulcanizate was attributed to correct amount of Ln that could increase crosslink density and reinforce the interface structure of NR matrix/HAF‐Ln particle. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1755–1762, 2006     

氧化还原引发降解天然橡胶与丙烯酸酯共聚的研究

研究了降解天然橡胶胶乳与丙烯酸甲酯、丙烯酸丁酯的聚合，以过氧化苯甲酰—N，N—三甲基苯胺(BP0—DMA)为氧化还原引发剂，考察了不同反应温度、引发剂配比、乳化剂用量及加料方式对单体转化率和接枝率的影响；用红外光谱对共聚物进行了表征。结果表明，采用乳化还原引发剂可使聚合反应低温快速进行，过量还原剂起阻聚作用，采用复合乳化剂可提高聚合反应速度和乳液稳定性，补加料可提高接技率。     

全参考图像质量评价综述

图像质量评价是图像处理领域内一项很有意义的研究课题。客观图像质量评价方法可分为全参考评价方法、半参考评价方法和无参考评价方法, 目前全参考评价方法较为成熟, 而半参考和无参考评价方法则处于初级阶段, 远远达不到参考评价方法所能达到的效果。对全参考评价方法进行综述。首先简要地介绍了各种类型的评价方法, 其次详细地介绍了PSNR、SSIM、MSSIM、IFC、VIF、FSIM等几种典型的全参考图像质量评价方法, 然后在LIVE和TID2008数据库上进行实验, 对这几种全参考方法进行对比、分析, 最后探讨图像质量评价研究的发展趋势。     

基于自然语言处理的算法知识名称发现

网络中的很多程序资源在知识概念上有内在的联系,却没有超链接将它们连接在一起。将网络程序资源中的算法知识名称获取出来,组织成一个算法知识专家库文件,用于识别程序设计资源所含的知识点,即可将程序设计资源按知识点相互联系。为了自动获取程序资源中的算法知识名称,提出一种基于自然语言处理的算法知识名称发现方法。通过发现含有算法知识名称语句的字符串模式,从程序资源中提取可能含算法知识名称的字符串,从中找出最有可能出现在算法知识名称中的分词,并根据这些分词获取算法知识名称。实验结果表明,与原有人工整理出的算法知识名称集合相比,该方法新增了11.2%的算法知识点和13.6%的算法知识名称。