Theoretical Investigation of Muon and Muonium Trapping and Hyperfine Interactions in the Chemical Ferromagnet p-NPNN (β-phase)

The trapping sites for muon and muonium in β-phase ferromagnetic p-NPNN have been determined by the first-principles Unrestricted Hartree–Fock procedure. Four trapping sites are found for the muon near the two nitrogen and two oxygen atoms of the two NO groups. For the singlet state of trapped muonium, two trapping sites are found near the two oxygens of two NO groups and for the triplet state two trapping sites are found near the two oxygens of the NO₂ group. The observed μSR signal at zero field with frequency 2.1 MHz is assigned to the singlet muonium sites near the two oxygens of the two NO groups and the high frequency signal ascribed to an isotropic hyperfine constant of 400 MHz is assigned to the two trapped muon sites near the two nitrogen atoms of the two NO groups. This revised version was published online in September 2006 with corrections to the Cover Date.     

吸湿/快干功能性织物对织物结构的要求

阐述了吸湿/快干功能性织物对纤维原料和织物结构的基本要求,提出了一些对有关织物设计的指导性意见.     

储层岩石矿物成分对酸蚀裂缝导流能力的影响

储层岩石矿物成分是酸压改造效果影响因素之一。研究认为,在储层岩石矿物成分中易溶物的含量及分布方式决定了酸蚀裂缝导流能力大小,易溶蚀物的含量越多,岩石溶蚀速率越快。室内测试了不同溶蚀速率下的灰岩和白云岩的酸蚀裂缝导流能力,研究了岩石溶蚀速率、易溶蚀物含量对酸蚀裂缝导流能力的影响,对酸压工艺设计方案提出了指导性建议。研究结果表明,储层岩石溶蚀速率与酸蚀裂缝导流能力增加倍比存在抛物线关系,易溶蚀物占30%40% 时酸蚀裂缝导流能力保持较好。     

易挥发多组分溶液粘度的测定

易挥发多组分溶液体系的粘度数据,在国内外有关物理化学手册中基本没有报道,其主要原因在于现行测定所用粘度计为敞开型.它无法阻止易挥发多组分溶液由于选择性挥发造成的浓度改变.故不能用于上述体系粘度与浓度关系的精确测量.笔者制作一     

应用简易模糊推理的多级判别与预测

将模糊数学与多元统计相结合,提出一种模糊推理的简易方法,可避免计算多维模糊关系矩阵的困难。所述方法能更多地利用相关因子（线性的多线性的）信息,具有处理模糊信息的能力,不受样本数据概率分布的限制,因而提高了多级判别与预报的效果,它可用作趋势及定值预报,能更广泛地应用于实际问题。     

Dynamic Microwave-assisted Extraction Online Coupled with QuEChERS for the Determination of Organophosphorus Pesticides in Cereals by Gas Chromatography

A rapid analytical method was first developed to detect organophosphorus pesticides(OPPs) in cereals, which used dynamic microwave assisted extraction(DMAE) coupled online with a modified quick, easy, cheap, effective, rugged, and safe(QuEChERS) method. Cereals samples were mixed with a certain amount of quartz, C₁₈ and the primary second amine(PSA), and extracted successively with the acetonitrile-water solution(80%, V/V) under microwave irradiation. The obtained eluate was directly introduced into a collection tube containing NaCl and MgSO₄. Finally, the supernate was evaporated and reconstructed, and determined by gas chromatographic spectrometry. Some factors affecting the experimental results were studied and optimized. The extraction and purification processes were carried out coinstantaneously and 12 samples could be treated in one step in 4 min. Low limits of detection(0.43-1.31 μg/kg) for OPPs were obtained in cereals. The relative standard deviations(RSDs) were 2.1%-9.3%. The recoveries of OPPs ranged from 76.1% to 100.2%. By combining the advantages of DMAE with QuEChERS, the sample pretreatment process was simple to operate, with little amount of organic solvent. The whole extraction process was completed in a closed environment, therefore it was very appropriate for daily analysis of OPPs in cereals.     

Reinigen mit Licht und Regen

After the discovery of the lotus‐effect in the 1970s the attention concerning the field of self‐cleaning surfaces increased rapidly. Besides hydrophobic surfaces which are designed following the example of the lotus flower, superhydrophilic and photocatalytic active coatings play an important role. These coatings are using sunlight to oxidize pollutants and remove residues by rinsing with water. Coatings based on the lotus‐effect suffer from their weak mechanical durability, but are able to work without light. On the other hand, photocatalytic layers are mechanically stable, but they need to be illuminated to become self‐cleaning.     

面向服务机器人的简易编程环境设计

开发了一套面向服务机器人的简易编程环境.利用此环境可以绘制机器人作业环境的地图,使用图标进行可视化的编程,并对机器人的运行进行二维和三维动画仿真.编程环境模块间采用CORBA标准通信,功能独立的各模块可以分布在网络中不同的计算机上,也易于移植到其他编程平台.在双臂移动式服务机器人SmartPal上的演示实验表明,此编程环境是有效的.     

基于逐步宽容约束法的广州花都区土地利用优化配置研究

 以逐步宽容约束(GECM)方法为基础,构建多目标线性规划模型,以社会、经济和生态效益为系统约束,设置涉及土地面积、土地利用结构、宏观计划、资源及技术约束等8个方面的GECM约束条件,对广州市花都区土地利用结构进行优化配置研究,研究表明花都区2008年的用地水平接近2020年合理用地的规模,研究结果可为花都研究区土地资源合理利用提供建议。