浮床栽培柳树在富营养化水体中的生长特性及水质净化效果研究

以浮床水培柳树（Salix babylonica Linn）为对象,研究其在富营养化水体中2a积累的生物量、株高与生物量关系以及植物体对N、P的吸收情况．结果显示,柳树从种子到幼苗的过程中所积累的生物量鲜重平均为789g／株．2a内,在种植密度为12．5株／m^2的浮床上,每平方米柳树浮床能将34．2m^3的水从V类水净化为Ⅲ类水质（以TP计）．柳树对富营养化水体的修复进程相对缓慢,但易于管理,适宜于水体的长期净化．     

滞留塘系统在山区面源污染控制中的效果研究

非点源污染的本质是农村生态系统严重失调,为控制和削减进入受纳水体径流的污染负荷,各种治理技术措施得到相应发展,滞留塘便是其中之一,通过对都拉乡河道滞留塘技术的研究与分析,发现处理前总氮（TN）、氨氮（NH3-N）、总磷（TP）和悬浮颗粒物平均浓度分别为8.75mg.L-1,2.97mg.L-1,0.54mg.L-1,24.0mg.L-1;处理后总氮（TN）、氨氮（NH3-N）、总磷（TP）和悬浮颗粒物平均浓度分别为6.04mg.L-1,1.66mg.L-1,0.18mg.L-1,12.0mg.L-1。各项污染物平均去除率分别为31.0%,44.1%,66.7%,51.9%,滞留塘系统对氮、磷及悬浮颗粒物的截留效果较好。     

Total synthesis of violaceimides A–E and consideration of the reported stereochemistry

Here we report the first total synthesis of violaceimides A–E, a family of sulfur-containing metabolites from Aspergillus violaceus, a sponge-associated fungus. A concise, convergent and enantioselective synthesis was developed for all five family members, from a common advanced intermediate. However, while the NMR spectral data matched that of the reported natural products, the optical rotations were of opposite sign. This result prompted the enantioselective synthesis of all four diastereomeric pairs of violaceimide E, and suggests that the stereochemistry might have been misassigned.     

Introducing efficient palladium catalyzed cross coupling reaction of tertiary alcohols and aroyl chlorides for the synthesis of highly substituted esters

Esters are chemical compounds with many practical uses. The common type of esterification is called the Fischer esterification. Another one is by the action of acid chlorides on alcohols but not with tertiary alcohols. The stable carbenium ions formed from tertiary alcohols favor elimination and the byproduct, hydrogen chloride prevents ester formation. In this new report, palladium inserted ArCOPdCl species reacts with tertiary alcohols and cross-coupling under microwave heating, minimizes the formation of probable carbenium ion, and promotes successful production of highly substituted esters in good to high yields.     

基于优选波长的复合肥总氮含量可见/近红外光谱分析

利用可见/近红外光谱分析仪得到复合肥的原始光谱,经过MSC和一阶导数预处理后,建立了复合肥中总氮含量的PLS模型,实现了复合肥中总氮含量的快速准确无损测量。通过选取不同范围波长建模,取得了预测决定系数（R²）、预测标准差（S_RMSEP）、相对分析误差（K_RPD）最好的基础波段。在基础波段的基础上,采用优选波长算法,获得了加入波长后的模型的预测决定系数和预测标准差图。通过分析,最终确定加入42个优选波长。实验结果表明,加入优选波长后的模型的预测决定系数由不加优选波长模型的0.760 4提高到了0.991 1,S_RMSEP降低为原来的1/5,K_RPD提高到原来的5倍。     

多孔混凝土水质净化性能

设计制作了多孔混凝土水质净化试验装置,对5种不同粗骨料粒径和空隙率的多孔混凝土进行了水质净化性能试验.附着在多孔混凝土表面的生物体的数量可间接地通过溶解氧(DO)的消耗量来检测.多孔混凝土的水质净化性能可通过总磷(TP)和总氮(TN)的去除量进行评价.试验结果表明:多孔混凝土在水中具有富集营养物质,使生物膜附着生长其上的效应;采用10～20mm粒径的集料所制备的空隙率为25%的多孔混凝土其水质净化效果最佳.     

TN_（12）M_（10）合金在真空SHS处理中气体的析出及其对密度的影响

在高真空条件下，进行了ＴＮ１２Ｍ１０合金的高温自蔓延合成（ＳＨＳ）试验研究。发现在真空条件下的ＳＨＳ过程，自始至终都有气体放出，特别在ＳＨＳ反应期间放出的气体更多；该条件下的ＳＨＳ产品比在Ａｒ气保护下的ＳＨＳ产品具有较高的密度。     

Magnetic properties of iron-intercalated titanium diselenide

Powder samples of Fe_xTiSe₂ (0.00 ≤ x ≤ 0.50) have been prepared by direct reaction of high purity elements. Crystal parameters were determined by the Debye-Scherrer powder diffraction technique. Magnetic susceptibility measurements were made by the Faraday method in the temperature range 1.5–300 K and indicated magnetic odering for compositions with x > 0.03. The magnetic ordering temperature, T_m, was observed to move to higher temperature with increasing iron concentration. These results have been interpreted in terms of a spin-glass model for low iron concentrations (x < 0.2) and antiferromagnetism for high concentrations (x > 0.2).     

TN—C系统中的接地和接零分析

本文分析了TN—C系统中的“接地”、“接零”方式,并对其作了较为全面地探讨