Columnar aerosol optical properties at AERONET sites in central eastern Asia and aerosol transport to the tropical mid-Pacific

IEECAS SKLLQG

~(85)Zr的高自旋态和磁转动带研究

<正>质量数80区的过渡性核表现了集体性和单粒子性的能级结构。对质子数Z为37～40、中子数N=45的原子核,如81Kr,87Mo核,在中低自旋时显示了单粒子特性,而在高自旋态时表现出较多的集体性。 近些年来,在过渡区在束γ谱学,如83Rb、83Y等核研究中,观察到了一串建立在较高K态的增强的△I=1的M1跃迁。它被认为是一种新的激发模式,叫做磁转动带。我们对85Zr的研究目的,一是将其能级推到更高自旋,另一个是寻找该核的磁转动带。

Hadron physics programs at HIRFL-CSRm: Plan and status

An internal target experiment at HIRFL-CSRm is planned for hadron physics, which focuses on hadron spectroscopy, polarized strangeness production and medium effect. A conceptual design of Hadron Physics Lanzhou Spectrometer (HPLUS) is discussed. Related computing framework involves event generation, simulation, reconstruction and final analysis. The R&D works on internal target facilities and sub-detectors are presented briefly.

辽西地区水分亏缺与树木生长关系

利用修正的Thornthwaite最大蒸发力公式,计算了辽西地区不同市的水分亏缺量。各市最大潜在蒸发散计算结果是:朝阳1180.6 mm,锦州1146.0 mm,葫芦岛1140.1 mm,阜新1030.3 mm;水分亏缺量计算结果为:朝阳-658.3 mm,锦州-538.4 mill,葫芦岛-544.8 mm,阜新-626.9 mm。利用美国spss数理统计软件计算了油松与蒙古栎的胸径连年生长量和对应的各年1—12月份的月均温、月降雨量、平均相对湿度的回归关系,表明油松生长与温度紧密,蒙古栎生长与水分关系紧密。

黄土高原森林枯枝落叶层保持水土的有效性

采用人工模拟与天然降水相结合的方法 ,定量研究了枯枝落叶层保持水土的有效性。研究结果表明 ,在黄土高原常见坡度 2 5°和暴雨雨强 1～ 2 mm/m in的条件下 ,该地区油松和山杨林枯枝落叶层保持水土的有效厚度为 0 .9～ 1.0 cm,低于这个数量 ,将明显降低其蓄水减沙效益

施用镁、硼及硝基腐植酸对烤烟产量和品质的影响

以辽宁省昌图县横沟子乡先锋村烟田的土壤农化性状指标为参数，设计镁、硼素及硝基腐植酸作为烟草专用肥的添加剂，研究其对提高和改善烤烟产量、品质的影响，１９９１～１９９３年三年的田间试验表明，亩施硫酸镁、硼砂各０．５ｋｇ及硝基腐植酸３．５ｋｇ做基肥，移栽４０天，镁、硼处理区再分别喷施硫酸镁５００克（１％浓度），硼砂１００克（０．２％浓度），这三个处理区不论是烟株苗期生长的叶色、抗病力及成熟期烟叶落黄、烘烤效果，还是上等烤烟比重、化学成分含量等指标均有改善和提高。

土壤抑真菌作用与细菌群落结构的关系

自然清洁土壤所具有的抑真菌作用,是健康土壤的一种自然属性,也是土壤质量的重要指标之一,对控制农作物土传病原真菌的爆发具有积极的生态学意义.本试验以中国科学院沈阳生态实验站近10年未受农药和肥料影响的撂荒地土壤作为自然清洁土壤样品,通过高温(对照、100℃、110℃、121℃)处理得到具有不同抑真菌作用的土壤模型,采用PCR-DGGE(变性梯度凝胶电泳)方法对上述土壤样品的细菌群落结构进行分析.结果表明:土壤抑真菌作用与土壤细菌群落结构紧密相关;对照清洁土壤抑真菌作用最强,处理后土壤细菌群落结构偏离自然清洁土壤愈远,土壤抑真菌能力愈差;DGGE特异性条带切胶测序结果表明,Sphingomonas asaccharolytica、Nitrospira sp.、Hyphomicrobiaceae sp.、Bacillus megaterium和Micro-coccus sp.可能与土壤抑真菌作用密切相关.

Enhanced resonance light scattering based on biocatalytic growth of gold nanoparticles for biosensors design

The biocatalytic growth of gold nanoparticles (Au-NPs) has been employed in the design of new optical biosensors based on the enhanced resonance light scattering (RLS) signals. Both absorption spectroscopy and transmission electron microscopy (TEM) analysis revealed Au-NP seeds could be effectively enlarged upon the reaction with H2O2, an important metabolite that could be generated by many biocatalytic reactions.

Functionalization of single-walled carbon nanotubes with Prussian blue

Chemical functionalization of single-walled carbon nanotubes (SWNTs) has constructed plenty of new structures with ample new properties into them. But the modification was often confined to organic molecules, either by covalence or non-covalence. In this report, SWNTs were successfully functionalized with one kind of electroactive inorganic compounds: Prussian blue (PB). And the molecular interactions between them were firstly investigated. Interestedly, pi-pi stacking interaction coupled with ionic interaction was found between SWNTs and PB. The electrochemical properties of SWNTs-PB were also investigated. It would pave a new pathway to manipulate molecular entities of SWNTs by cooperation with functional inorganic electroactive compounds.

Chemiluminescent determination of luminol and hydrogen peroxide using hematin immobilized in the bulk of a carbon paste electrode

A new method for immobilization of a chemiluminescent reagent is presented. It is based on immobilizing hematin, a catalyst for luminol reaction, in the bulk of a carbon paste electrode. Bulk-immobilization allows renewal of the surface by simple polishing or cutting to expose anew and fully active surface in the case of fouling or deactivation by other means. By using a hematin-modified carbon paste electrode, the applied potential shifted negatively compared with that of unmodified carbon paste electrode or a glassy carbon electrode. The shift in potential changed the reaction processes and effectively stabilized the chemiluminescent signal during successive measurements. Under this condition, the signal was stable during 3 hours of continuous operation. The log-log plots of the emitted light intensity vs. luminol concentration and hydrogen peroxide concentration were linear over the region 10(-8)-10(-3) mol L-1 with a correlation coefficient of 0.999 and 3.9 x 10(-6)-10(-3) mol L-1 with a correlation coefficient of 0.994, respectively. Application of this method for other chemiluminescent and bioluminescent systems is suggested.

拉曼光谱法在膜模拟体系结构研究中的应用

表面活性剂单分子层和双分子层以及磷脂泡囊是最广泛应用的膜模拟体系,本文总结了二十年来以拉曼光谱方法为手段在该研究领域内的研究结果,并着重评述了近十年来的研究进展。

INTERACTIONS OF THIAMINE WITH ANIONS - STRUCTURE OF THIAMINE DITHIOCYANATE

The crystal structure analysis of {3-[(4-amino-2-methyl-5-pyrimidinyl)methyl]-5-(2-hydroxyethyl)-4-methylthiazol}ium dithiocyanate reveals that there are two types of anion bridges between the two aromatic rings of the same thiamine which adopts the usual F conformation, one of which involves a contact between H(C2) on the thiazolium ring and the hydroxy O atom from a neighbouring molecule. The crystal packing shows a novel triple helical structure formed by strongly hydrogen-bonded thiamine-SCN- molecular chains.

中性载体ETH157推动Cu~(2+)离子在水/硝基苯界面上的转移

本文用循环伏安法研究了中性载体ETH157推动Cu~(2+)离子在水/硝基苯界面上的转移过程,结果发现在水/硝基苯界面上,Cu~(2+)离子与ETH157形成了逐级配合物,并伴有吸附现象产生,考察了有关过程的转移机制并讨论了相应的实验现象。