Pb污染对土壤动物群落结构的影响

应用Pb(NO3)2对土壤动物进行了污染模拟实验,共获得土壤动物1289个,隶属3门7纲.结果显示,Pb污染浓度直接影响土壤动物群落结构的变化.在获得的1289个土壤动物中,优势类群为弹尾目、前气门亚目和甲螨亚目,3个优势类群占土壤动物全捕量的78.2%,对动物群落结构起决定作用.随着Pb污染浓度的增加,土壤动物的类群数、个体数和多样性指数都呈现出明显的下降趋势.从实验结果看,蜱螨目和弹尾目是反映土壤Pb污染程度的敏感指示类群.     

三明市畜禽养殖业污染状况与防治对策研究

根据三明市农业面源污染状况调查的有关资料,分析了全市畜禽养殖业污染状况,提出了畜禽养殖污染防治对策的建议.     

东山火电厂淡水水源方案比选分析

东山火电厂位于水资源十分紧缺的东山岛,项目所需水量需从岛外引进.本文通过对杜塘、峰头两水库的天然来水量、可供水量计算及水库水量供需平衡分析,论证不同取水方案的可靠性.并对推荐取水方案的可行性进行初步分析.     

Pseudo-particle modeling for gas flow in microchannels

The velocity profiles and temperature distributions of gas flow in microchannels, for Knudsen numbers ranging from 0.01 to 0.20, are investigated with pseudo-particle modeling (PPM). It has been found that the velocity profiles are mainly affected by Knudsen number and the external force fields applied. When Knudsen number was increased, the slip velocities on the walls increased at the beginning, and then decreased. The temperature distributions were also significantly affected by the external force. The Darcy friction factor increased with increasing Knudsen number, and its variation with Mach number under increased Knudsen number was similar to the so-called premature laminar-turbulent transition observed in experiments.     

Study on peptide-peptide interaction using high-performance affinity chromatography and quartz crystal microbalance biosensor

The specific interaction between sense and antisense peptides was studied by high-performance affinity chromatography （HPAC） and quartz crystal microbalance （QCM） biosensor. Fragment 1-14 of human interferon-β （hlFN-βwas chosen as sense peptide and its three antisense peptides （AS-IFN 1, AS-IFN 2, and AS-IFN 3） were designed according to the degeneracy of genetic codes. The affinity column was prepared with sense peptide as ligand and the affinity chromatographic behavior was evaluated. Glu-substituted antisense peptide （AS-IFN 3） showed the strongest binding to immobilized sense peptide at pH 7.5. A quartz crystal microbalance-flow injection analysis （QCM-FIA） system was introduced to investigate the recognition process in real-time. The equilibrium dissociation constants between sense peptide and AS-IFN 1, AS-IFN 2 and AS-IFN 3 measured 2.08×10^-4, 1.31×10^-4 and 2.22×10^-5 mol/L, respectively. The mechanism study indicated that the specific recognition between sense peptide and AS-IFN 3 was due to sequence-dependent and multi-modal affinity interaction.     

水源热泵技术的应用性探讨

一、水源热泵开发研制的背景截至20世纪70年代,世界能源结构已经经历了三次大转变,即从木柴转向煤炭,由煤炭转向石油和天然气,继而又从以油、气为主的能源系统转向以可再生能源为基础的持久能源系统。据资料估计,目前全世界已经探明的煤炭、石油、天然气、油页岩等石化燃料资源     

解决引黄工程供电系统谐波污染的措施和方法

针对引黄供电系统的实际情况,就抑制谐波、补偿无功功率、消除谐波引起的谐振等问题进行了研究和探讨。     

微生物絮凝剂的应用研究

以处理高岭土悬浊液和池底污泥配制成的废液为基础,测定了其絮凝性,得出各种废水的最佳处理条件,探讨了金属阳离子对微生物絮凝性的影响。     

试析可持续发展思想在环境资源立法中的不足及完善

环境问题是当今国际社会的普遍问题,用可持续发展思想指导立法是解决环境问题的最好办法.但我国目前的环境资源立法还很不完善,因此完善立法已成为当务之急。     

"十五"期间铜陵市环境空气质量状况及对策研究

以铜陵市近几年环境空气监测数据为基础,评价了环境空气质量现状,分析了空气污染特征和产生原因,指出了铜陵市环境空气存在的主要问题,同时还对铜陵市的环境空气质量变化趋势进行了分析。