莫阿光纤光栅的光谱特性及其在光分插复用器中的应用

从耦合模理论出发，结合莫阿光纤光栅的结构特性，运用分段均匀和传输矩阵法对幕阿光纤光栅的光谱特性进行了理论分析和数值计算；详细研究了线性啁啾莫阿光纤光栅的滤波特性，在此基础上，提出了一种新型的基于线性啁啾莫阿光纤光栅的光分插复用器的结构设计方案。     

PREPARATION OF ELECTRICAL CONDHCTIVE MOLYBDENUM OXIDE BY THERMAL DECOMPOSITION OE HYDRAZINE-CONTAINING MOLYBDENUM SALT

A new method of preparing electrical conductive molybdenumoxide by thermal decomposition from hydrazine-containing molybdenum saltwas described.The process of the thermal decomposition of hydrazine-containing molybdemum salt was investigated by thermal analysis(TG and DTA)and the thermally decomposed product was studied by S.E.M.and chemicalanalysis.The result indicated that the molybdenum oxide obtained in thisway was electrical conductive.     

Influence of capillary pressure on the evaporation of thin liquid films

A model is presented that considers the influence of capillary pressure on the evaporation of a liquid film on a vertical that plate. The governing equations are derived and numerically integrated with a step-variable Runge-Kutta method. The numerical results are compared with the analytical solution from Nusselt's film condensation theory. The deviation from the Nusselt film theory become very prominent when the liquid film becomes thin enough. This can be attributed to the fact that the Nusselt film theory does not consider the influence of capillary pressure on the shape of the liquid film.Es wird ein Modell vorgestellt, das den Einfluß des Kapillardrucks auf die Verdampfung eines dünnen Flüssigkeitsfilms berücksichtigt, der entlang einer senkrechten Platte herabrieselt. Die maßgebenden Gleichungen werden abgeleitet und numerisch mit einem Runge-Kutta-Verfahren veränderlicher Schrittweite integriert. Die numerischen Ergebnisse werden mit denen der Nusseltschen Filmtheorie verglichen. Dabei ergeben sich beträchtliche Abweichungen von dieser in den Bereichen, in denen der Flüssigkeitsfilm sehr dünn wird. Dies ist darauf zurückzuführen, daß die Nusseltsche Filmtheorie den Einfluß des Kapillardrucks auf die Filmkontur nicht berücksichtigt.     

一种新的数字式多媒体图像采集系统

本文以多媒体概念为指导思想，论述了一种新的数字式多媒体图像采集系统。它采用多制式数字解码器、视频窗口控制器等超大规模集成电路芯片构成，较之以往的模拟式图像采集系统有本质区别     

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.