208Hg β－ 衰变γ纲图

以¹⁸O重离子束轰击厚天然铅靶,通过多核子转移反应生成²⁰⁸Hg核.辐照铅片放入离线熔化铅靶气相热色谱装置中处理,分离并收集汞元素产物.完成了4πΔE_βγ-γ,γX(γ)关联事件谱及γ射线时序单谱测量.建议了21条γ射线,以及能量为1365,1727keV的两条²⁰⁸Tl新能级的²⁰⁸Hg β^－ 衰变部分γ纲图.     

丰中子奇A核145,147Ce的集体带结构

通过对²⁵²Cf自发裂变产生的瞬发γ谱的测量,对丰中子奇A核^145,147Ce的高自旋态进行了研究,首次识别了¹⁴⁵Ce的集体带结构,扩展了¹⁴⁷Ce的集体带结构,扩展了¹⁴⁷Ce的能级,并新识别了3个边带,粒子–转子模型的计算指出,^145,147Ce的晕带可能来自于νi_13/2轨道的耦合,¹⁴⁵Ce基态起源于(νh_9/2νf_7/2)组态混合,而¹⁴⁷Ce基态则起源于νh_9/2轨道.在这两个核中未观测到明显的八极形变带,然而,在¹⁴⁷Ce中观测到的一个边带,可能显露出八极关联的迹象.     

时序建模方法在滑油光谱分析中的应用

本文讨论了时序建模方法在机械设备滑油光谱分析中的应用。通过运用ＡＲ模型对采集的航空发动机滑油光谱数据进行时序建模和预测分析,获得了满意的效果。这一成果,为机械设备的状态监控和故障预报提供了一种实用方法。     

超痕量H2O2对MnSO4-KBrO3-乙酰丙酮化学振荡体系的扰动

化学振荡波和生物体内的生物振荡及生物形态现象的相似性促使人们认识到生命现象和非生命现象之间遵循着某些相同的规律, 因而化学振荡反应非线性动力学一直是物理化学研究的热点[1, 2]. 近年来它在分析化学中的应用使其研究扩展到了一个新的领域, 但仍停留在10-7 mol/L的水平上[3]. 显然, 以这个量去研究包含众多基元反应和反应中间体的振荡反应, 得到的是数目庞大的反应物种群体行为, 而这种行为并不足以说明生命现象的猝发病变、代谢功能衰竭及运动寿命终止的原因.     

碳气凝胶的制备研究

气凝胶是由纳米量级超细粒子或高聚物分子聚结构成的多孔性轻质固态材料 ,它在声学、光学、电学、动力学和低温热学等方面具有独特性质 ,因此受到多方面研究者的重视 [1～ 4 ] .碳气凝胶最先是由 Pekala等 [5] 在 80年代末研制成功的 ,其突出特点是网络连续 ,电导率高 ,孔洞微小且相互贯通 ,比表面大 ,密度变化范围大 ,是制造高性能电容器和电池的新一代理想材料[6 ,7] .这种材料的低温电导率随温度连续单调变化 ,在一定温区范围内 ( <1 0 0 K)其电阻温度敏感度远大于传统的掺碳玻璃、锗以及其它金属电阻温度计材料 ,可望成为一种理想的低…     

Electrochemical Reduction Characterizations of Aromatic Nitro-Compounds

In this paper, the electrochemical reduction characterizations of the aromatic nitro-compounds including nitrobenzene, α-nitronaphtahlene and l,5-dinitroanthraquinone in the sulfuric acid solution were investigated and the reaction mechanism was proposed as well. The electrochemical measurements such as cyclic voltammetry, quasi-steady-state polarization, fast linear potential sweep and chronoamperometry were carried out by using EG&G 273A electrochemical measurement system. The results showed that three compounds could be reduced electrochemically to the corresponding aminophenol confounds under the suitable reaction conditions on Cu-Hg cathode. The reduction peak potential was all in the range of -0.4 to -0.6 V (vs. SCE) for the above confounds. The corresponding specific surface activity energy tested was 21.5, 16.4 and 21.2 kJ/mol respectively, means the better electrochemical reduction activity on Cu-Hg electrode. Further investigation on the reaction mechanism disclosed that α-nitronaphtahiene and 1,5-dinitroanthraquinone have the similar reaction mechanism to that of nitrobenzene to para-aminophenol, i.e.,Bamberger rearrangement courses. With the increasing of the number of benzene number, the temperature and the concentration of needed for the electrochemical reduction increased correspondingly, i.e.,90℃ for nitrobenzene, 110℃ for α-nitronaphtahlene and 140℃ for l,5-dinitroanthraquinone respectively. The reaction rates are proportional to the concentration of the reactants the corresponding conditions.     

Imaging Cholesterol Vesicles Aggregation in Bile Models

Investigation of aggregation of cholesterol vesicles is essential for the understanding of gallstones prior to the appearance of cholesterol monohydrate crystals. In this article, according to existing data based on various microscopic techniques and present data on various microstructural pathways leading to cholesterol crystal formation in bile models, we considered the bile models composed of cholesterol, bile salts and lecithin and distilled water and employed light polarization microscopy and microelectrophoresis apparatus. Concentrated isotropic solutions of bile models were diluted to induce cholesterol supersaturation and start an evolution of microstructures, leading to cholesterol crystallization.     

偶氮金属螯合物的合成及其光学和热学性质

偶氮金属螯合物的合成及其光学和热学性质;噻唑基偶氮金属螯合物;光学性质     

强荧光铽配合物LB膜光学微腔

在光学微腔中,最典型的结构是Ｆａｂｒｙ－Ｐｅｒｏｔ平面谐振腔,它由两个互相平行的反射镜组成,两镜之间放置工作物质．常用的反射镜有两类：介质镜和金属镜［１］．介质镜由具有不同介电常数的一系列物质相互层叠制成,这种“镜”对某一特定波段的电磁波具有优良的反...     

DL－苹果酸－丙酮－BrO~3^-－Mn^2^+－H~2SO~4化学振荡 反应诱导期的新特征 及其动力学研究

在前文研究工作的基础上,较详细地研究了DL-苹果酸(以下简称DL-MA)、丙酮(以下简称Act)参与下的新型化学振荡反应及各种影响因素,对各主要参与反应物质在诱导期中的作用、起振原因、诱导期的新特征和可能反应机理进行了较为深入的研究,分别获得DL-MA,KBrO~3,MnSO~4的浓度对诱导期影响的拟合方程。以及诱导期的表观活化参数为E~I~N=68.50kJ·mol^-^1。