溶胶凝胶法制备磷钨酸掺杂TiO2薄膜及其光催化性能

以钛酸四丁酯为前驱物,采用溶胶凝胶法制备了磷钨酸掺杂的二氧化钛薄膜.通过XRD、FT-TR对该薄膜进行了表征,研究了薄膜在对氯苯酚光降解中的催化活性.结果表明,当磷钨酸与二氧化钛摩尔比为0.01:1、薄膜烧结温度600℃、对氯苯酚溶液浓度30 mg/L(pH＝5)、光催化8 h的条件下,对氯苯酚的降解率超过90%,且薄膜可以重复使用.磷钨酸对二氧化钛的光催化活性具有明显的促进作用.     

生物絮凝剂MBFGA1预处理乳制品加工废水

用生物絮凝剂MBFGA1预处理乳制品加工废水（简称废水）。实验结果表明，废水处理的水力条件为：以150r／min的转速搅拌30S，再以30r／min的转速搅拌20min；MBFGA1的最佳加入量为15mg／L；废水pH为4．0时，MBFGA1对废水的絮凝处理效果最好；废水温度对浊度、COD去除率有一定的影响，在20～45℃时，废水浊度的去除率始终保持在85％以上；30℃时，COD去除率达到最大值65．0％。     

Fe0/厌氧微生物联合体系处理2,4,6-三氯酚影响因素的研究

利用Fe⁰/厌氧微生物联合体系对2,4,6-三氯酚(2,4,6-TCP)进行降解研究。结果表明，Fe0/厌氧微生物联合体系可以有效降解2,4,6-TCP，Fe⁰与厌氧微生物之间存在明显的协同效应。Fe⁰/厌氧微生物联合体系处理2,4,6-TCP的最优条件为：微生物接种量0.434 g VSS/L，Fe⁰投加量15 g/L，体系初始pH值7.0～8.0。     

中国安全防范产品行业协会第三届第三次理事(扩大)会议总结

各位理事、各位来宾、同志们、朋友们: 为期三天的中国安全防范产品行业协会第三届第三次理事(扩大)会议,完成了各项预定议程,顺利结束.     

长江流域的昆虫病毒资源及其开发利用

在长江流域已发现约１３０种昆虫病毒，其中多数属杆状病毒科。昆虫病毒作为杀虫剂在本地区广泛应用，防治棉花、森林、茶树、蔬菜和牧草上的害虫，克服了化学农药的一些缺点，取得了良好的生态效益和经济效益。近年来还进行了杆状病毒表达载体的研究，该系统的研制已用于高水平表达具有生物活性的外源基因产物，获得医药产品，或者组建更有效的基因工程病毒杀虫剂。     

Increased fetal nuchal fold leading to prenatal diagnosis of ring chromosome 15

We report on the prenatal diagnosis of ring chromosome 15 in a fetus with increased nuchal fold and intrauterine growth restriction (IUGR). A 27-year-old woman gravida 2, para 1 had normal maternal serum screen tests in the early second trimester of the index pregnancy. Fetal nuchal fold thickening up to 8 mm was incidentally found during the routine obstetric ultrasound scan at 20 weeks' gestation. Amniocentesis was undertaken and the fetal karyotype was found to be 46,XY,r(15) on cytogenetic study. Fluorescence in situ hybridization (FISH) using a telomeric probe of chromosome 15 demonstrated a terminal deletion on the q arm of the ring-shaped chromosome 15. This is the first report of a prenatally diagnosed case of ring chromosome 15. Moreover, nuchal fold thickness in the second trimester may have a role in its prenatal diagnosis. Copyright © 2001 John Wiley & Sons, Ltd.     

广州轨道交通三号线高速行驶条件下对安全限界的影响研究

给出了轨道交通车辆横向偏移量的计算方法 ,并应用列车 -线路动力耦合模型 ,分析了广州地铁三号线的安全限界变化问题。确定了当前按 80km/h行车速度设计的建筑限界能满足 13 0km/h行车速度的要求 ,限界尺寸不需改动可保证列车运行安全平稳     

滇池鲤鱼的背景元素调查

通过滇池鲤鱼与松花坝水库和国内外同类鲤鱼的元素含量对比,确认滇池鲤鱼受工业污水的危害影响主要是As、Se。鱼体As、Se含量目前已经超过正常值,Ni、Cr、Cu、Fe、Pb比正常值偏低,其它元素属正常值范围。为了避免过多的元素富集,建议滇池鲤鱼以半年到一年为生长捕捞期为宜。     

Effect of Habitat Fragmentation and Isolation on the Population of Alpine Musk Deer

The alpine musk deer (Moschus chrysogaster) is a key species of some terrestrial ecosystems, it has an important economic and conservative significance as a kind of medical animal in China. Due to the interaction between natural forces and human disturbance, the habitats of alpine musk deer are fragmented and isolated in different mountains and the populations are confronted with many problems of survival. In this paper, we discuss the impact of habitat fragmentation and isolation on alpine musk deer populations based on the investigation on the population densities and sizes and environmental factors in different reserves, as well as on the analysis of its ecological adaptability. We found that the alpine musk deer has strong ecological adaptability; the population development of alpine musk deer may benefit from the reduction of the forest area and even from the fragmentation and isolation of the habitat to a certain extent. However, deforestion should not be encouraged only for the alpine musk deer population, but should also be based on the overall consideration of biodiversity conservation.