过量维生素A对鼠胚眼发生影响的超微结构研究

本实验选用雌性wistar大鼠14只,妊娠第8天胃管给予Vit.A 120mg/kg体重,分别于妊娠第10、11、12、13、14、17、20天剖腹取胎,进行电镜观察,结果显示在透射电镜下角膜、晶状体、视网膜的细胞膜结构不清,线粒体肿胀,次级溶酶体增多,粗面内质网(RER)扩张,核染色质边集,核周障增宽。扫描电镜发现,角膜前上皮表面微绒毛减少,视网膜层次变薄,视网膜细胞侧面突起减少。本文对上述变化进行了讨论。     

冶金除尘灰资源化装置控制系统

介绍了冶金除尘灰资源化装置先进的计算机控制系统的结构配置、功能特点、及其所采用的新技术;该自动化控制系统运行稳定可靠,为冶金除尘灰资源化装置高效运行发挥了重要作用。     

IMPROVED ACCURACY AND ROUGHNESS MEASURES FOR ROUGH SETS

Accuracy and roughness, proposed by Pawlak(1982), might draw a conclusion inconsistent with our intuition in some cases. This letter analyzes the limitations in these measures and proposes improved accuracy and roughness measures based on information theory.     

认知Ad hoc网络中基于市场的三级频谱分配方案

分簇是Ad hoc网络规模较大时采用的主要结构,而频谱分配是Ad hoc网络的关键技术之一。该文针对认知无线电环境的分簇Ad hoc网络,提出了一种新的基于市场的频谱分配方案,该方案中簇首节点依据业务比例从频谱管理中心购买频谱,簇内采用基于供需市场理论的频谱分配算法。分析了簇内频谱市场的两种迭代定价算法额外需求迭代算法和连续松弛迭代算法以及簇首需求订购的过程。该方案能实现各簇收益的最大化,簇首基于需求的频谱购买相对于等量购买进一步提高了频谱效用。仿真结果表明这种频谱分配方案能有效提高系统频谱效用,额外需求迭代算法和连续松弛迭代算法均表现出良好的收敛性能。     

振动作用下饱和细粒物料中的超孔隙水压力

设计了测定振动作用下饱和细粒物料中超孔隙水压力的实验装置, 通过试验获得了超孔隙水压力随时间变化的定量关系曲线, 提出了估算孔隙水压力变化的方法。     

超声波协同臭氧处理剩余污泥

采用超声波协同臭氧工艺进行剩余污泥溶胞减量,考察了工艺条件对污泥减量效果的影响,并分析了处理过程中污泥性质的变化情况。结果表明:采用超声波和臭氧同时作用工艺,在超声波频率为20 kHz,声能密度为0.5 W/mL,臭氧投加速率为100 mg/min,反应时间为60 min的最佳条件下,污泥减量率达到40.11%,并且污泥粒径由处理前的29.76 μm降至处理后的10.01 μm,沉降比由0.93降至0.11,溶解性化学需氧量、总氮、总磷质量浓度依次由45,8,0.20 mg/L上升至1 242,129,12.41 mg/L,挥发性悬浮固体物与总悬浮固体物质量浓度比则由0.79降至0.63。     

炼油生化剩余污泥催化深度减量技术的工业应用

大幅减少炼油生化剩余污泥对降低企业污泥处理和处置费用、保护生态环境意义重大.考察了炼油生化剩余污泥催化深度减量SM R技术工业化的处理效果,运行结果表明:对含水率98.3％ 的炼油生化剩余污泥,经过SMR污泥减量装置的处理,污泥脱水性能得到显著改善,脱水残渣平均含水率57.1％、污泥量减少99.4％、挥发性悬浮物平均去...     

Potential of predominant activated sludge bacteria as recipients in conjugative plasmid transfer

We investigated the possibility of conjugative plasmid transfer to the predominant bacteria in activated sludge and the factors influencing the transfer frequency in the activated sludge process. We performed conjugative transfers of a self-transmissible, broad-host-range plasmid RP4 from Escherichia coli C600 to activated sludge bacteria by broth mating. Most of the activated sludge bacteria tested could acquire plasmid RP4, although the transfer frequencies varied from 8.8 x 10(-7) to 1.3 x 10(-2) transconjugants per recipient. The transfer frequencies in several strains were similar to, or higher than, that in intraspecific transfer to E. coli HB101. Matings under various environmental conditions showed that factors relevant to physiological activity, such as temperature and nutrient conditions, seemed to affect the transfer frequency. In addition, conjugative transfer was detected even in filtered raw and treated wastewaters. Thus, the predominant activated sludge bacteria seem to have sufficient potential as recipients in conjugative plasmid transfer under the conditions likely to occur in the activated sludge process. Transfer frequency was reduced by agitation in the presence of suspended solid. This may suggest that conjugative plasmid transfer is physically inhibited in aeration tanks.     

制革废水快速启动UASB反应器

制革废水是一类污染负荷很高的工业废水,由于其自身的特点,利用高效的厌氧处理技术处理高负荷的制革废水还是一个新的研究领域。本文简单综述了几种制革废水快速启动UASB反应器的技术和研究,力争对UASB工艺在制革废水处理方面的实际应用起到指导作用。     

铬在土壤和植物中的吸附、迁移和累积规律研究进展

介绍了农用制革污泥中的铬在土壤环境中的迁移转化积累,分析了植物对铬的吸收和积累规律,并探索了铬在植物生长发育中的作用和对土壤—植物系统的影响,为制革厂污泥农用提供一定的理论依据。