稠油中饱和烃复杂混合物成分解析及其意义

利用两根极性不同的毛细柱,在全二维气相色谱上分析辽河油田遭受严重生物降解形成的稠油饱和烃组分,可以将传统色谱分析时形成的“基线鼓包”即不可分辨的复杂混合物（Unresolved Complex Mixtures）分开．根据饱和烃全二维气相色谱谱图的族分离特点和瓦片效应,结合飞行时间质谱提供的质谱信息初步解析不可分辨的复杂混合物主要成分．发现常规色谱分析时形成的所谓“基线鼓包”是由成千上万、含量相对较低的不同取代基的环状化合物组成,这些化合物在一维色谱上以分子量递增的顺序排列,在二维色谱上以极性的差异或者环的多少排列．C24之前的第一组不可分辨的复杂混合物主要由环己烷为基本单元的单环、双环和三环烷烃类化合物组成,信噪比在100以上的化合物数量约为饱和烃总数量的75％,质量分数是饱和烃总量的80％以上,是饱和烃的主要组成部分．C24之后出现的第二组不可分辨的复杂混合物主要由四个环或者五个环为基本单元的化合物组成,信噪比在100以上的化合物数量约为饱和烃总数量的17％,质量分数是饱和烃总量的0．5％．对稠油中这些不可分辨的复杂混合物的解析有助于对其成因机理的认识和高效开采方案的制定．     

离子印迹传感器选择性检测甲基汞离子

以甲基汞离子为模板,8-巯基喹啉为荧光单体,4-乙烯基吡啶为功能单体,乙二醇二甲基丙烯酸酯为交联剂,偶氮二异丁腈为引发剂,在二甲基亚砜溶剂中,以聚偏氟乙烯(PVDF)膜为支撑介质,65℃热引发聚合得到甲基汞离子荧光印迹膜。该荧光印迹膜对甲基汞离子表现出良好的选择性,最佳吸附pH值为7.0,检出限为3.5×10-7mol/L。将其作为吸附材料,应用于河水中甲基汞离子的分离和富集,结果表明,该传感器对甲基汞离子具有良好的选择性和特异性吸附,回收率达93%～104%。     

负载苯基荧光酮纤维富集-GFAAS法测定痕量锗

苯基荧光酮;负载纤维;富集;石墨炉原子吸收;锗     

季铵化聚4-乙烯吡啶衍生物与葫芦脲[6]的超分子自组装及性质研究

通过葫芦[6]脲(CB[6])与季铵化聚4-乙烯吡啶衍生物2在水溶液中于室温下进行超分子组装, 得到一种新型的超分子聚合物3, 并通过¹H NMR, IR, 元素分析, X射线粉末衍射分析(XRD)对其结构进行了表征, 证实CB[6]位于2的侧基脂肪链上, 通过非共价键与2结合; 通过热重分析(TGA)、紫外-可见吸收(UV-vis)对其性质进行了研究, 证实了超分子聚合物3比相应的聚合物2有更高的热稳定性, 以及更强的UV-vis吸收.     

图的无符号拉普拉斯和距离无符号拉普拉斯特征值

Let G be a simple graph. We first show that ■, where δiand di denote the i-th signless Laplacian eigenvalue and the i-th degree of vertex in G, respectively.Suppose G is a simple and connected graph, then some inequalities on the distance signless Laplacian eigenvalues are obtained by deleting some vertices and some edges from G. In addition, for the distance signless Laplacian spectral radius ρQ(G), we determine the extremal graphs with the minimum ρQ(G) among the trees with given diameter, the unicyclic and bicyclic graphs with given girth, respectively.     

核壳结构三元含氟丙烯酸酯乳液的制备及表征

以甲基丙烯酸三氟乙酯(Actyflon-G03)、丙烯酸丁酯(BA)、甲基丙烯酸甲酯(MMA)为原料,采用质量比为 1/1 的 OP-10/SDS 复合乳化荆,利用种子乳液聚合法,合成了核壳结构共聚物乳液.研究了温度对聚合反应、氟单体含量对聚合物膜吸水性及硬度的影响,采用 DSC、SEM-EDX、TEM 表征了共聚物膜的性能及乳胶粒子特征.结果表明:当 Actyflon-G03 含量为 23.28%时,核壳型结构粒子呈球形分布,粒径约为 80～110 nm,膜吸水率最低,硬度最高,并有 75.85%的最大转化率和 0.58%的最低凝胶率.SEM-EDX 分析显示,氟原子在成膜过程中向膜表面迁移,降低了膜的表面能.     

一种变象管分幅/扫描的高时间分辨光谱测量方法

本文详细介绍了西安光机所正在研制中的一种变象管瞬时光谱测量系统,它由WDG30型光栅光谱头与JTG 305型变象管分幅/扫描摄影机组成。文中给出了系统的总体设计考虑、变象管及其控制和主要性能参数。     

压力下CeSb晶体的导电特性研究

在4.2—273K 温区内,0—14 Kbar 压强下,测量了 CeSb 单晶的电阻率.计及 P-f 互作用随温度的变化,我们在理论上计算了与压强有关的 CeSb 磁性电阻率,并将计算结果与实验值比较.     

A Novel Synthesis of Alkaline Earth Silicate Phosphor Sr3MgSi2O8： Eu^2＋, Dy^3＋

A novel method for synthesizing long afterglow silicate phosphor Sr3MgSi2O8：Eu^2＋,Dy^3＋using TEOS and inorganic powders as reactants was reported. Acetic acid as a catalyzer controlled the hydrolysis of TEOS by adjusting pH value of the system. The morphologies of precursor were characterized by transmission electron microscope （TEM）. The structure and optical properties of the phosphor powders were systematically investigated by means of X-ray diffraction and spectrofluorometry. TEM images have reflected the core-shell structure and quasi-spherical morphology of the precursor particles. It was found that the single-phase Sr3MgSi2O8 crystalline structures were obtained at 1050 and 1250 ℃ for the samples prepared with the nano-coating method and the solid state reaction, respectively. The emission intensities of the phosphors prepared by the present method were higher than those by the conventional process. Also, the afterglow characteristic was better than that prepared by solid-state reaction in the comparable condition.     

亚微米级Ag2S空心球的乳液法合成

Hollow Ag₂S spheres have been prepared via hydrolyze reaction of Ag₂S₂O₃， which formed from the reaction of AgNO₃ with Na₂S₂O₃， in cyclohexane/water/polyglycol emulsion system. It was found that the component of the reaction system has a significant influence on the formation of hollow Ag₂S spheres. The possible formation mech-anism of the hollow Ag₂S spheres in the emusion system was also discussed.