WATER STATES IN SBR BASED WATER SWELLING RUBBER

Water swelling rubber (WSR) was prepared by reaction blending SBR andsodium polyacrylate (PAANa). The existing states of water in the WSR was studied bymeans of DSC and TG. It was found that water exists in three states: nonfreezing water,bound freezable water and free water. The relationships between water states and structureof PAANa were investigated. The results showed that the amount of non-freezing waterwas related to total water content, and the ratio of non-freezing water versus -COONagroups on PAANa (mol/mol) was about 4. However, total water content slightly affectedthe content of bound freezable water and remarkably affected the amount of free waer.     

Simultaneous Determination of Aromatic Amines by Liquid Chromatography Coupled with Carbon Nanotubes/Poly (3-methylthiophene) Modified Dual-Electrode

Liquid chromatography with amperometric detection (LC-AD) is developed and applied to simultaneously determine five aromatic amines. In the LC-AD, a new carbon nanotubes/poly(3-methylthiophene) modified dual-electrode is fabricated and then used as the working electrode. It is found that this chemically modified electrode (CME) exhibits efficiently electrocatalytic oxidation for aromatic amines with relatively high sensitivity, stability and long-life. Thus, lower detection in LC-AD can be achieved, which are 4.0 × 10^–8 mol L^–1 for aniline, 1.6 ×10^–7 mol L^–1 for 4-nitroaniline, 1.0 × 10^–7 mol L^–1 for 4-chloroaniline, 1.5 × 10^–7 mol L^–1 for 1-naphthylamine, 1.7 × 10^–7 mol L^–1 for 2-bromoaniline. The recoveries of the five analytes are also determined, which range between 0.95 and 1.05 for drinking water, 0.86 and 1.10 for the LiWa River water.     

An efficient procedure for protection of carbonyls in Brønsted acidic ionic liquid [Hmim]BF4

Protection of carbonyls as acetals or ketals using Brønsted acidic ionic liquid [Hmim]BF₄ as catalyst as well as solvent was investigated. Satisfactory results were obtained for the protection of carbonyls as cycloacetals or ketals with diols. The product can be separated conveniently from the reaction system, and the ionic liquid can be reused after removal of water.     

Studies on Natural CXN Zeolite： Modification, Framework De-alumination and Ion-exchange

A natural CXN zeolite (stilbite, type code-STI) discovered in China was modified with NH4^ exchange by using ammonium salt and calcinations (procedure Ⅰ), or with NH4 exchange followed by treatment with acid (procedure Ⅱ). The coordination state of Si and A1 atoms in the framework, the property of ion exchange, and the adsorption of the H-STI zeolite samples prepared by different modification procedure were investigated with XRD,EDX,^29Si and ^27Al MAS NMR, Ag^ ion exchange and Ne adsorption. The results of the investigations indicate that different procedure of the modification made variety on the distribution of the framework Si atoms and A1 atoms,the content of non-framework aluminum, and the blocking channels and the shielding effect to the positions of the exchangeable cations. The H-STI zeolite prepared by the procedure Ⅱ possesses high ion exchange capacity, open and perfect pore system, and high thermal stability.     

高效液相色谱法测定蛹虫草中腺苷和虫草素

在蛹虫草中腺苷和虫草素含量的反相高效液相色谱分析中,所用色谱柱为WatersNOVA-PAK C18(3.9 mm×300 mm,4μm),流动相为0.01 mol.L-1KH2PO4-K2HPO4缓冲溶液(pH 6.86)+1%(体积分数)四氢呋喃,流速为1.0 mL.min-1。紫外检测的波长为260 nm,峰面积与腺苷浓度和虫草素浓度之间的线性范围依次为1.27~50.5 mg.L-1和3.23~129.0 mg.L-1,其检出限依次为0.18 ng和0.25 ng。在腺苷及虫草素的浓度水平依次为5.05 mg.L-1和12.9 mg.L-1时测试方法的精密度,求算得RSD(n=7)值依次为0.094%和0.792%。用标准加入法试验方法的回收率,求得两者的平均回收率依次为103.2%和98.5%。     

WRSN的最短路径规划和最优电池容量研究

针对单个移动充电器自身耗能最短路径规划问题,采用基于改良圈修正初解的遗传算法进行求解,同时利用LKH算法进行检验得到一致的结果,最终得出的路径最小值为11483.24m.在此基础上,对于最小电池容量的问题,创新性地提出了条件大规模传感器电池容量和中小型传感器电池下的时变模型,并给出其中下满足不同周期的最小电池容量方案.     

负P表示非经典光场的Wehrl熵和Shannon熵

研究了负P表示非经典光场的Wehrl熵和Shannon熵与场参数m和平均光子数(-n)的关系,结果显示,负P表示的非经典光场的Wehrl熵随着场参数m和平均光子数的增大而减小,当(-n)增大到一定程度时Wehrl熵趋向于一个不变的常数.用数值计算的方法研究了负P表示光场的Shannon熵与平均光子数(-n)的关系,结果表明,Shannon熵随着场参数m和平均光子数(-n)的增大而增大.同时发现,Wehrl熵随光场总噪声的增大而减小,Shannon熵随力学量起伏的减小而减小.     

两纠缠原子之一与腔场相互作用过程的纠缠研究

使一对纠缠的二能级原子之一与单模真空腔场发生共振相互作用,通过选择不同的演化时间,对这个三体系统的其中之一做选择性测量,可调节另外两体的纠缠状态。在不做测量时,研究了在不同的初始状态下,三体纠缠及三体中两两纠缠的演化特性。结果表明,该体系纠缠都呈现周期性的振荡,特别是,通过选择合适的初始状态和演化时间可生成强壮纠缠态———W纠缠态;在特定演化时刻,可使两纠缠原子的纠缠信息完全转化到腔外原子和腔场中去。     

大挠度弯曲直梁混合变量最小势能原理的应用

应用大挠度弯曲直梁混合变量最小势能原理,求解均载两端固定大挠度柱面弯曲板条的轴向挠度分布和轴向弯矩分布．实例计算表明:该方法简单实用、精度高,是一种计算大挠度柱面弯曲板条变形的有效方法．     

基于CARR模型的交易量与股价波动性动态关系的研究

股市交易量与股价变化的关系就一直是学术界与实务界所共同关心的主题。基于Chou(2005)提出的CARR模型对两者的动态关系问题进行了研究。首先分析了作为量价关系理论基础的混合分布假说理论在CARR模型中的适川性,进而基于混合分布假说理论对我国上证综合指数、深证成份指数以及随机抽取的十只个股进行了量价关系的实证检验。研究发现:混合分布假说理论同样适用于CARR模型,这证实了股价波动性的CARR效应的存在。实证的结果也证实了CARR模型无论是对于股票指数还是单只股票交易量都具有了良好的解释作用。因此,CARR模型与GARCH模型相比,在交易量与股价波动关系动态关系的研究领域可以得到更为稳健的结果。