An eta(6)-toluene complex of neodymium: [Nd(eta(6)-C6H5CH3)(AlCl4)(3)]

The Nd-III ion in hexa-mu-chloro-1:2 kappa(2)Cl;1:3 kappa(2)Cl;1:4 kappa(2)Cl-hexachloro-2 kappa(2)Cl,3 kappa(2)Cl,4 kappa(2)Cl- [1 (eta(6))- toluene] trialuminiumneodymium has distorted pentagonal bipyramidal coordination geometry. Five Cl atoms form the equatorial plane, and the toluene ring and the sixth Cl atom occupy the apical sites. The average Nd-C(eta(6)) and Nd-Cl distances are 2.926 (5) and 2.857 (1) Angstrom, respectively.

LIFETIMES OF RYDBERG LEVELS IN THE PERTURBED 6SNP P-1,3(1) SERIES OF YBI

Using two methods: (1) three-step excitation and (2) single UV photon excitation in an atomic beam with direct observation of the decay of the fluorescence light, we have measured the lifetimes of the Rydberg levels of YbI belonging to the perturbed series 6snp J = 1 levels. The measured values have been interpreted by the multichannel quantum defect theory (MQDT).

Sm~(3+)在玻璃中的发光以及Sb~(6+)、Ce~(6+)、Gd~(3+)对Sm~(3+)发光性质的影响

本文研究了单掺(Sm~(3+),Ce~(3+)、Gd~(3+).Sb~(3+)、双掺(Sm~(3+)+Ce~(3+)、Sm~(3+)+Gd~(3+),Sm~(3+)+Sb~(3+))和兰掺(Sm~(3+)+Gd~(3+)+Ce~(3+))约四十余种不同玻璃的发射谱和激发谱.探讨了玻璃成份和掺杂离子浓度对Sm~(3+)发光性质的影响以及Ce~(3+),Gd~(3+)、Sb~(3+)、Ce~(3+)+Gd~(3+)对Sm~(3+)的敏化作用。

DOPING EFFECTS ON THE POLYMER-CHAIN STRUCTURE OF POLY(3-METHYLTHIOPHENE)

The C=C stretching Raman shifts and photoluminescence (PL) for poly(3-methylthiophene) (P3MT) are measured at various doping levels by in situ electrochemical Raman and PL spectroscopic techniques. It is found that the doping for P3MT induces the nonlinear excitations (soliton, Polaron, bipolaron), but also affects the polymer-chain structure, including the conjugated length and the interchain distance.

3种绿绒蒿挥发油化学成分的GC-MS分析

目的 分析全缘叶绿绒蒿、五脉绿绒蒿和多刺绿绒蒿挥发油的化学成分.方法 采用水蒸气蒸馏法获得挥发油,经GC-MS技术结合计算机检索对其化学成分进行分离和鉴定,用色谱峰面积归一化法计算各组峰的相对含量.结果 从全缘叶绿绒蒿、五脉绿绒蒿和多刺绿绒蒿的挥发油中分别鉴定了25,42和53个化合物,占其各自总量的80.76%,73.34%和76.10%.结论 3种绿绒蒿挥发油化学成分存在一定程度的差异,但其主要成分都为酯类物质

青藏高原3种植被类型净生态系统CO2交换量的比较

采用涡度相关观测技术系统, 于2003年7月1日～2004年6月30日对青藏高原高寒草甸3种植被类型(矮嵩草草甸、金露梅灌丛草甸和藏嵩草沼泽化草甸)生态系统CO2通量进行观测和分析. 结果表明, 嵩草草甸、灌丛草甸和沼泽化草甸CO2最大吸收率分别为16.78, 10.42和16.57 mmol/m2•s; 最大CO2排放率分别为8.22, 7.73和18.67 mmol/m2•s; 嵩草草甸和灌丛草甸一年从大气中分别吸收CO2 282和53 g/m2, 而沼泽草甸一年向大气排放CO2 478 g/m2. 证明青藏高原嵩草草甸和灌丛草甸比C4草原和一些低海拔草原和森林具有一个较低CO2吸收和排放量潜能, 而沼泽化草甸具有一个较高的排放潜能, 揭示了青藏高原高寒草甸生态系统不同植被类型的碳源/汇的明显差异, 主要是由植物光合能力不同和土壤呼吸差异引起的.

Local warming about 1.3 degrees C in alpine meadow has no effect on root vole (Microtus oeconomus L.) population during winter

The influence of air and soil warming on root vole (Microtus oeconomus L.) population was studied in winter period in top open chambers (OTC) (0.8-1.8 m(2) warmed by conical fiberglass material and situated in alpine meadow (3250 m) at Qinghai-Tibet Plateau, China. The OTCs were distributed on an area of 30 x 30 m of experimental warming site; another site of the same area was a control one. The root vole population was investigated on two pairs of sites in "low-grazing" and "high-grazing" (by sheep) parts of the meadow; mark-recapture method was used. The winter-season averaged air and soil temperature inside of the chambers were 1.3 degrees C higher than the temperature outside the chambers. The warming in the chambers had no statistically significant effect on root vole numbers, on average body mass of individual, and on average body mass of males and females. In conclusion, as small as 1.3 degrees C warming of soil and air introduced locally and on small (several m(2)) scale, in the alpine meadow habitat in winter period, has possibly no effect on root vole numbers and biomass.