大气环境中的水分子团簇分布和H＋(H2O)n (n＝4～16)离子的解离

报道了用质谱学方法首次测得的大气中各种水的团簇分布情况. 表明在室内大气环境下, 水主要是以几个至几十个水分子所组成的分子团簇的形式存在, 且团簇的分布与空气湿度, 即水在空气中的分压有关. 实验中, 除观测到空气中也存在前人已报道过的具有笼状结构的H＋(H2O)21外, 还观测到其他几种较稳定结构的水的团簇, 即H＋(H2O)4, H＋(H2O)10和H＋(H2O)15. 实验中所测得的水分子团簇分布结果与使用的离子源以及质量分析器种类无关. 我们还用碰撞诱导解离(CID)的方法研究了H＋(H2O)n (n＝4～16)离子的碰撞解离产物, 结果表明, 对于H＋(H2O)n (n＝4～16)的离子, 其较稳定的离子的碰撞解离产物均为H＋(H2O)n (n＝4～6). 我们还进一步研究了H＋(H2O)10离子的碰撞解离产物与碰撞气体(即Ar气)密度的关系, 得到了碰撞气体密度与碰撞解离产物分布的关系.     

成都金沙遗址古代陶片的PIXE和RBS分析(英文)

成都金沙遗址的年代覆盖了商代晚期至西周时期（公元前1200年—公元前650年）, 一般被认为是三星堆文化的延续。初步建立了质子激发X射线发射（PIXE）和卢瑟福背散射（RBS）实验装置, 并采用PIXE和RBS方法研究了从金沙遗址出土的部分陶片的元素组成。通过因子分析, 观察到来自不同地层的陶片的元素组成存在一定的差异, 这可能意味着制作陶器的陶土在不同时期取自不同的地点。也观察到来自不同发掘坑的陶片的元素组成没有明显的聚类现象, 这可能意味着制作不同使用用途的陶器所用的陶土是没有区别的。Jinsha Ruins Site, Chengdu, China, spanned the age from late Shang Dynasty to Western Zhou Dynasty (B.C.1200—B.C.650), was generally considered as the inheritance of Sanxingdui Culture. This paper focuses on the studies of the pottery unearthed from Jinsha. PIXE and RBS experimental setup was preliminarily established and these techniques were employed to find the elemental composition of those collected shards. From the results of factor analysis, the differences can be seen among pottery shards from different stratums, which may suggest that the clay gathered from different sites was used in different periods. The authors also found that there was no obvious assemblage phenomenon in the factor analysis among the pottery shards from different pits, this may be the evidence for “no special clay for special use”.     

新型外包锚固式节点抗震性能试验研究

上、下部结构的连接节点是保证RC框架-轻钢增层混合结构整体协同工作的关键,本文提出一种用于该类混合结构的新型外包锚固式节点,并对该新型节点与传统植筋节点进行了拟静力试验,对比分析了滞回曲线、骨架曲线、强度退化、刚度退化和耗能能力等抗震性能。结果表明:两榀节点试件均为梁铰破坏,新型外包锚固式节点相对于传统植筋节点有效地限制了混凝土梁的裂缝开展,提高了节点承载力和刚度,减缓了强度和刚度退化,增强了节点塑性铰的转动能力;滞回环呈弓形;耗能能力和等效黏滞阻尼系数提升约2倍。     

Crystal Structure,One-and Two-photon Excited Fluorescence and Bioimaging of a D-π-A Structural Triphenylamine Derivative

An electron donor-π-bridge-electron acceptor(D-π-A) optical functional organic compound comprising a triphenylamine moiety as the electron donor and pyridine moiety as the electron acceptor was synthesized. The structure of the compound was solved by single-crystal X-ray diffraction analysis. It crystallizes in monoclinic, space group P21, with a = 9.753(5), b = 8.815(5), c = 25.554(5) ?, β = 96.315(5)°, V = 2184(2) ?~3, Z = 2, D_c = 1.136 g/m~3, F(000) = 792, Μr = 746.92, μ = 0.069 mm~(-1), the final R = 0.0658 and wR = 0.1730 for 6790 observed reflections with I 2(I). Study of nonlinear optical properties shows that the compound exhibits excellent two-photon excited fluorescence with the two-photon absorption cross-section value of 116 GM. The structure-property relationship was researched in detail through X-ray crystallography and quantum chemical calculation. Result of living cell imaging experiment shows its potential in fluorescence microscopy bioimaging.     

钇掺杂锆酸钡中空微球的发光性能

采用水热法合成了不同钇掺杂量的BaZrO3中空微球,并通过TEM,XRD和SEM等手段对样品进行了表征.结果表明,样品均为中空微球,钇掺杂进入BaZrO3晶格,产物均具有立方钙钛矿型结构.中空微球的粒径随钇掺杂量的增加由180 nm增大到300 nm.钇掺杂量小于3%时,可得到纯相.不同掺杂量的中空微球在410 nm光...     

扭环形控制器的新设计

无自启动能力的时序电路是没有实用价值的,通过对传统设计中利用无关项化简逻辑函数实质的分析,提出了多码状态分配技术,实例设计表明,该技术不但可解决时序电路设计中存在的自启动问题,而且具有综合方法简单,易获得简单的电路。     

红壤利用方式对铝形态和毒性的影响

研究了红壤不同利利用方式对铝的活性和形态的影响。结果表明：四种活性铝的提取剂对土壤中铝的提取力顺序一般为０．５ｍｏｌ／ＬＮａＯＨ＞１ｍｏｌ／ＬＨＣｌ＞１ｍｏｌ／ＬＮＨ４Ａｃ＞１ｍｏｌ／ＬＫＣｌ。土壤中水溶性铝含量对土壤酸度十分敏感。     

Application of DEPBT on the Synthesis of the Protected Dipeptides Containing Histidine with Unprotected Imidazole Group by Solution Method

3- (Diethoxyphosphoryloxy)- 1,2,3-benzotriazln-4 (3H)-one (DE-PBT) was an organophosphorus coupling reagent developed by our group. It was an effective coupling reagent for the synthesis of protected peptides containing Tyr, Ser and Thr with unprotected hydroxy group on their side chain. The further study of the synthesis of a series of protected dipeptides containing hisfidine with unprotected imidazole group using DEPBT is reported. During the synthetic procedure, the imidazole group of histidine did not need to be protected. When the carboxyl components were N-protected aromatic amino acids or basic amino acids, the yields were relatively high (63%--81%). However,when the carboxyl components were N-protected acidic amino acids, the yields were relatively low (47%--48%). The results expanded the application of DEPBT on the synthesis of bioactive peptides containing histidine.     

稀土高分子荧光材料的研究

综述了稀土高分子荧光材料的研究基础,比较了不同方法合成的稀土高分子发光材料的结构与性能,介绍了当前该领域的研究进展。     

深紫外波段苯的差分光学吸收光谱DOAS定量方法研究

取代基通过取代苯环上的H原子形成不同苯系物(苯、甲苯、二甲苯等),其共有结构苯环上的不固定π键电子受到激发,使得苯系物在紫外波段240～280 nm具有明显的特征吸收结构,鉴于此大气中的苯及相关的苯系物可以通过差分光学吸收光谱(DOAS)方法来进行定量,但采用该波段测量需要考虑以下问题:首先是氧气(O2)的吸收干扰问题...