高汞煤燃烧过程中汞的析出规律试验研究

针对3种中国典型的高汞煤,利用马弗炉和管式试验炉进行了燃烧温度、燃烧时间等条件因素影响燃煤汞的析出及形态迁移转化的试验研究。研究表明,燃烧条件下加热时间对典型高汞煤中汞的析出率的影响不明显;高汞煤燃烧后,煤中汞在很短时间内即以气态方式进入烟气,并主要以二价汞(Hg2 )和零价汞(Hg0)形式存在,其形态分布与燃烧温度和煤种有关;随着燃烧温度的升高,烟气中的二价汞含量有逐渐升高和零价汞含量逐渐降低的趋势。     

不完备信息系统的Rough模型扩充

在处理不完备信息系统时,需要对经典粗糙集理论进行扩充。目前有一般容差关心,相似关系,限制容差关系等Rough集模型,然而这些模型还存在一定的局限性。本文对此进行了分析和改进,建立了基于k等价度容差关系的Rough模型。并通过实例说明了该模型具有很好的灵活性,得到的结果也更加符合实际情况。     

高精度测微计在车轴测量机上的应用方案

介绍了高精度测微计用于车轴直径测量的基本结构、关键技术及其在车轴测量设备上的应用.     

DHJ-500多刀玻璃划线机的研制

玻璃划线机设备是液晶生产线上的主要设备之一,在一定程度上决定着LCD产品的最终质量。该机主要是用于对大块或断条后的成盒玻璃进行划线,主要介绍了DHJ-500多刀玻璃划线机的概况、机械总体结构设计和电气控制设计等。     

焦化生产中煤岩学应用现状及对策分析

简述了与焦化生产关系密切的煤岩学基本概念,分析了煤岩指标测试的特殊性和标准化等问题,并对焦化生产中煤岩技术应用存在的不足之处进行探讨,提出应采取培养煤岩技术人员等相应对策来提高焦化领域煤岩学的应用水平.     

New Hormaphididae(Hemiptera,Aphidomorpha)from the Baltic Amber and its Palaeogeographic Significance

The present study describes a new genus and species Unicohormaphis sorini, which belongs to the subfamily Cerataphidinae. The contemporary distribution of aphids belonging to the Hormaphididae family is summarized and analyzed. According to the obtained data, the climate warming in Eocene was conducive to the expansion of the family over the areas of Europe. Subsequent climate changes, resulting from epeirogenic and orogenic movements towards the end of Eocene, led to a considerable cooling and drying of climate in the northern hemisphere. These processes contributed to the shrinking down of areas covered by subtropical forests, which constituted the habitat of Hormaphididae (Cerataphidinae). Retaining their way of life, the Cerataphidinae were forced to limit their distribution, and the representatives of the family in Europe became completely extinct.     

城市配电网的无功补偿方式

通过分析无功补偿对于电力系统的作用,并对配电系统四种无功补偿方案进行了技术比较,同时对补偿容量的确定加以讨论,说明合理选择无功补偿的方式及容量,可提高功率因数,降低能量损耗,改善电压质量,从而达到节约电能和提高电能质量的目的.     

变电站视频监控无缝接入综合自动化系统技术探讨

介绍变电站视频监控无缝接入变电站综合自动化系统,以及软件的二次开发,将安防、门禁功能与综自系统无缝接入,介绍视频监控系统和变电站综合自动化系统的“五遥”功能。     

微功耗涡旋流量计中铂电阻测温接口电路设计

传统的铂电阻测温法仍然是微功耗涡旋流量计优选的方案 .采用薄膜式铂电阻有利于温度和流量检测探头结构一体化 .实现微功耗的一些关键措施是 :引入基于反向分度函数的铂电阻线性化算式 ;充分利用LPC76 4内部软硬件资源组成双积分式A/D转换电路 ,控制激励电流以及在软件设计上设置“休眠陷阱”等等 .其结果测温接口部分的平均电流可以控制在 5 0 μA以下 .     

Somatic antigens of pseudomonads: structure of the O-specific polysaccharide of Pseudomonas fluorescens biovar B, strain IMV 247

The O-specific polysaccharide of Pseudomonas fluorescens biovar B, strain IMV 247, was studied by acid hydrolysis, GLC-MS and 1H and 13C NMR spectroscopy, including 1D and 2D NOE, 2D hybrid TOCSY and ROESY (TORO), and 2D H-detected heteronuclear multiple-bond correlation (HMBC) experiments. The polysaccharide was found to contain L-rhamnose, 3.6-dideoxy-3-[(S)-3-hydroxybutyramido]-D-glucose (D-Qui3NHb), 2-acetamido- 2,4,6-trideoxy-4-[(S)-3-hydroxybutyramido-D-glucose (D-QuiNAc4NHb) and 2-acetamido-2- deoxy-D-galacturonic acid (D-GalNAcA). Partial acid hydrolysis of the polysaccharide resulted in a non-reducing GalNAcA-->QuiNAc4NHb disaccharide with the 3-hydroxybutyryl group glycosylated intramolecularly by the QuiN4N residue. The following structure of the tetrasaccharide repeating unit of the polysaccharide was established:-->4) -alpha-D-GalpNAcA-(1-->3)- alpha-D-QuipNAc4NHb-(1-->2)-beta-D-Quip3NHb-(1-->2)-alpha-L- Rhap(1-->.