显像管玻壳铅尘污染特性的研究

以石家庄市显像管玻壳厂排放的铅尘为研究对象，通过在该玻壳厂周围土壤布点采样，较系统地研究了铅尘在大气和周围土壤中的迁移和转化规律，研究表明，用高斯模式能成功地预测铅尘在大气中的迁移扩散规律，玻壳厂周围土壤表层铅含量较大值出现在当地年主导风向（SSE，N）下风向，铅在土壤中的分布主要集中在0－20cm的耕作层，在20－40cm深度范围内，铅含量呈下降趋势，最大降幅达50％。     

高效菌活性污泥法处理分散染料废水实验研究

针对复合微生物的筛选和分离进行了研究 ,分离出处理分散染料废水起高效降解作用的 2株菌种。结果表明 ,2株高效菌对分散染料废水降解能力很强 ,与普通菌结果对比CODCr去除率提高 17% ,并且高效菌对废水浓度的耐受性也明显提高     

农药杀虫单的稻田流失规律研究

通过测坑、人工降雨等手段，对水溶性农药杀虫单的稻田消解动态、渗漏流失和径流流失等进行了研究。结果表明，(1)无水稻时，杀虫单在稻田水中消解的半衰期为0．76d；分蘖初期，杀虫单在稻田水中降解的半衰期为1．02d；平均为0．89d。(2)杀虫单的渗漏流失量在用药后8d内可达总用药量的7％—10％，平均为8．48％。(3)极端情况下，用药当天如果遇暴雨(50mm雨量)，杀虫单的径流流失量将达到用药量的30％左右。杀虫单的渗漏损失不可避免，故其流失控制应从径流损失着手，尽量避免在可能有暴雨的当天或雨前1—2d用药。     

有机锡化合物测定方法研究进展

总结了有机锡化合物常用的测定方法，包括气相色谱－火焰光度法，气相色谱与原子吸收联用，气相色谱－微波等离子体发射光谱法，气相色谱－质谱法以及液相色谱与名种检测方法联用等。对样品前处理、衍生化方法、色谱分离及测定等也进行了讨论     

A juvenile coelurosaurian theropod from China indicates arboreal habits

Here we report an unequivocal arboreal coelurosaur, Epidendrosaurus ningchengensis gen. et sp. nov. This juvenile coelurosaur's third manual digit is extremely elongated, distinctively different from that of other known dinosaurs and birds. It represents certainly a type of adaptation previously unreported from the Mesozoic although the exact function of the third manual digit is unclear. The relatively long forelimb, penultimate phalanx of manual digit II, and pedal penultimate phalanges, are interpreted as evidence for the arboreal habit of Epidendrosaurus. Because Epidendrosaurus is more similar to advanced birds in some arboreal features than to Archaeopteryx, we suggest that the initial appearance of tree-adaptation in theropods was probably not directly related to flight but to other functions, such as seeking food or escaping from predators. Electronic Supplementary Material is available if you access this article at http://dx.doi.org/10.1007/s00114-002-0353-8. On that page (frame on the left side), a link takes you directly to the supplementary material.     

Determination and discussion hydraulic retention time in membrane bioreactor system

Based on the microorganism kinetic model, the formula for computing hydraulic retention time in a membrane bioreactor system (MBR) is derived. With considering HRT as an evaluation index a combinational approach was used to discuss factors which have an effect on MBR. As a result, the influencing factors were listed in order from strength to weakness as: maximum specific removal rate K, saturation constant Ks, maintenance coefficient m, maximum specific growth rate ,ua and observed yield coefficient Yobs. Moreover, the formula was simplified, whose parameters were experimentally determined in petrochemical wastewater treatment. The simplified formula is θ= 1.1( 1/β -1)(Kｓ S)/KXo , for oetroehemical wastewater treatment K and Ko eaualed 0.185 and 154.2, resoectively.     

一种富稀土型三效催化剂的性能考察

对一种富烯土型三效催化剂的性能进行了考察，结果表明：该催化剂具有较好的三效活性和较好的启燃温度特性，具有较宛的空速适应范围，在空速为84000h^-1时，CO,NOx的转化率仍在90％以上，HC转化率仍在70％以上，该催化剂具有较好的耐老化性能，经实验室快速老化实验，即相当于实车行驶8万km,CO劣化系数，1.09,HC劣化系1．05，NOx劣化系数1．06，该催化剂经桑塔纳轿车整车28工况测试，其交化效果与该车配置的美国Engelherd公司的催化剂相当。     

Selectivity in the complexation of actinides by humic substances

The interactions of a range of actinide elements (Th, U, Np, Pu, Am) with humic substances from the Needle's Eye natural analogue site were studied by gel permeation chromatography. Bulk humic substances were isolated by ammonia extraction, followed by dialysis against distilled water and freeze-drying. The gel permeation results suggest that Needle's Eye humic substances can be fractionated into three incompletely resolved fractions with average molecular weights determined by analytical ultracentrifugation around 49 000 for Fraction 1, around 14 700 for Fraction 2 and around 8000 for Fraction 3. Although there are significant differences between the organic matter elution patterns in individual gel permeation experiments, presumably due to differences in column packing, these are much smaller than the differences between metal ions. The uranium that is naturally present in these humic substances is largely bound in the late-eluting fraction. Spikes of the early actinides, including Np and Pu in controlled valency states, have been added to the humic substances, and gel permeation of the spiked humic substances shows that the three humic fractions vary greatly in their effectiveness and selectivity as ligands for early actinides.     

河南省小麦白粉病流行原因和减灾对策

本文阐述了河南省小麦白粉病流行成灾的特点、原因和发展趋势,指出今后数年内小麦白粉病的发生仍将严重,并提出了短期和长期减灾对策建议.     

基于TMS320F240 DSP的电网谐波抑制全数字化控制的研究

为治理电力系统谐波污染 ,提高电力系统运行的安全稳定性 ,笔者对混合式并联有源电力滤波系统的结构和工作原理进行了分析和研究。该系统由无源滤波器和小容量有源滤波器串联构成 ,与被补偿的谐波负载并联连接。基于TMS32 0F2 4 0DSP开发套件 ,设计数字控制器主程序和中断服务子程序。实验结果表明 ,采用TMS32 0F2 4 0DSP编程方便并直观 ,运算精度高 ,控制器参数调整方便 ,易于实现各种控制策略。研究成果对DSP在有源电力滤波系统中的应用有重要参考价值。