KOPPELMAN-LERAY FORMULA ON COMPLEX MANIFOLDS

（钟同德）ＫＯＰＰＥＬＭＡＮ－ＬＥＲＡＹＦＯＲＭＵＬＡＯＮＣＯＭＰＬＥＸＭＡＮＩＦＯＬＤＳ￥ＺｈｏｎｇＴｏｎｇｄｅ（ＩｎｓｔｉｔｕｔｅｏｆＭａｔｈｅｍａｔｉｃｓ，ＸｉａｍｅｎＵｎｉｖｅｒｓｉｔｙ，Ｘｉａｍｅｎ３６１００５，Ｃｈｉｎａ）Ａｂｓｔｒａｃｔ...     

Characterization,solution properties,and morphologies of a hydrophobically associating cationic terpolymer

The acrylamide‐based terpolymers (PADB) with 4‐butylstyrene (BST) as the hydrophobic monomer and dimethyldiallyammonium chloride (DMDAAC) were synthesized by the micellar free radical technique. The polymer was determined by UV, FT‐IR and ¹HNMR, and the hydrophobic microblock structure of PADB was characterized successfully by the conventional DSC measurement. The use of DMDAAC improves the water solubility and intermolecular association of terpolymers. The feed amount of BST affects greatly the apparent viscosity of PADB solution. The polymer exhibits good viscosification property, salt resistance, temperature‐thickening, thixotropy, pseudoplastic behavior and shear‐thickening at low shear rate. The apparent viscosities of PADB solution remarkably increase by the addition of a small amount of surfactant. AFM measurements show that hydrophobic aggregates have been formed in 0.1 g dL^?1 PADB aqueous solution, indicative of strong associations of hydrophobic groups, which are reinforced with increasing PADB concentration. The microstructures of PADB are disrupted by the addition of small amounts of salt, resulting in the decrease in solution viscosity. However, with increasing NaCl concentration, the tree‐like associating structures are formed, leading to the increase in the solution viscosity of PADB. The AFM results reveal that the solution properties of PADB are due to the associating structures in the aqueous solution and brine solution. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 826–839, 2007     

A NEW MODEL FOR ESTIMATION OF DIFFUSION COEFFICIENT OF PHENOL DESORPTION WITHIN POLYMERIC RESIN UNDER ULTRASOUND

4 new model, phase equilibrium-kinetics model (PEKM), for estimation of diffusioncoefficient was proposed in this paper. Kinetic experiments of phenol desorption on NKAII resin inthe presence and the absence of ultrasound were separately conducted, and diffusion coefficients ofphenol within an adsorbent particle were estimated by means of proposed PEKM and classicsimplified model. Results show that the use of ultrasound not only changes the phase equilibriumstate of NKAll resin/phenol/water system which had been equilibrium at normal condition, but alsoenhances diffusion of phenol within the resin. The diffusion coefficient of phenol in the resin in thefield of ultrasound increases in an order of magnitude in comparison with the diffusion coefficientdetermined under no ultrasound Experimental results also indicated that the diffusion coefficientsestimated by PEKM were more accurate than that estimated by the classic simplified model.     

双奇核142Pm高自旋态能级纲图

利用能量为75—95MeV19F束流,通过反应¹²⁸Te(¹⁹F,5nγ)¹⁴²Pm研究了双奇核¹⁴²Pm的高自旋态能级结构.实验中进行了γ射线的激发函数、γ射线单谱和γγ符合测量.建立了激发能达7030.0keV的¹⁴²Pm的能级纲图,其中包括新发现的25条γ射线和13个新能级.基于实验测量的γ跃迁各向异性度,建议了¹⁴²Pm能级的自旋值.     

利用飞秒激光等离子体产生的超热电子进行衍射实验的可行性研究

利用高强度超短脉冲激光与铝靶相互作用可以产生高能超热电子,这些超热电子入射到铝单晶上时将发生衍射.对高强度超短脉冲激光产生的超热电子与晶体的相互作用产生衍射及利用这样的衍射进行晶体结构分析的可行性进行了探讨 关键词： 等离子体 超热电子 衍射 晶体     

Isothermal crystallization behaviors of isotactic polypropylene nucleated with α/β compounding nucleating agents

Sodium 2,2′‐methylene‐bis(4,6‐di‐tert‐butylphenyl) phosphate (NA40) and N,N‐dicyclohexylterephthalamide (NABW) are high effective nucleating agents for inducing the formation of α‐isotactic polypropylene (α‐iPP) and β‐iPP, respectively. The isothermal crystallization kinetics of iPP nucleated with nucleating agents NABW, NA40/NABW (weight ratio of NA40 to NABW is 1:1) and NA40 were investigated by differential scanning calorimetry (DSC) and Avrami equation was adopted to analyze the experimental data. The results show that the addition of NABW, NA40/NABW and NA40 can shorten crystallization half‐time (t_1/2) and increase crystallization rate of iPP greatly. In these three nucleating agents, the α nucleating agent NA40 can shorten t_1/2 of iPP by the largest extent, which indicates that it has the best nucleation effect. While iPP nucleated with NA40/NABW compounding nucleating agents has shorter t_1/2 than iPP nucleated with NABW. The Avrami exponents of iPP and nucleated iPP are close to 3.0, which indicates that the addition of nucleating agents doesn't change the crystallization growth patterns of iPP under isothermal conditions and the crystal growth is heterogeneous three‐dimensional spherulitic growth. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 590–596, 2007     

金属线性热膨胀系数的研究

 从温度T时的压强表达式出发，结合普适状态方程（UEOS）、Debye模型和热力学关系式，给出了计算金属线性热膨胀系数的普遍公式。并对Al、Cu、Pb的这一物理量进行了具体计算。结果表明，理论与实验符合较好。     

湖北绿茶中两种新的没食子酸类衍生物的结构鉴定

用2D NMR技术研究了从绿茶中分离得到的2种新的没食子酸类衍生物,对其¹H和¹³C NMR谱线作了全归属.     

由5-唑烷酮合成α-天冬氨酰肽类的简便方法(英文)

用一锅法制得了２－三溴甲基－３－甲酰基－５－氧－４－口恶唑烷乙酸，它与氨基酸酯反应形成题称化合物Ｎ－甲酰基－α－天冬氨酰肽类。