超越整函数Julia集的外延

设厂是超越整函数．并且F(f)≠￠．本文中我们证明如下结果；如F(f)不含DiophantineSiegel盘．则对几乎所有α∈EF(f)，有 J(f)=--∞∪n=0f-n(α) 其次我们考虑周期点属于F(f)的条件。     

效用函数模型在动态三角模糊多属性决策中的应用

针对权重信息已知的动态三角模糊多属性决策问题,根据三角模糊数自身的特点,构建三角模糊属性值的均值水平.以各时段属性值及对应均值水平的离差为研究对象,构建效用函数模型.该模型具有良好的"奖优罚劣"特性,能从全局细致考虑各时段的数据信息.利用模型将离差值转化为精确效用函数值,对各时段各方案的效用值进行加权集结,确定方案排序,为动态三角模糊多属性决策提供一种新的决策思路,并用实例说明该决策方法的有效性和优越性.     

Dynamics of stochastic single-species models

A type of stochastic single-species model is proposed and studied. The sufficient conditions of the existence of a unique solution, the existence of its stationary distribution, and stochastic permanence are obtained. Besides, the threshold conditions for its strong stochastic persistence and extinction are found. Finally, some examples and numerical simulations are introduced to support our main results.     

MBDLM中卡尔曼滤波算法的改进研究

根据多变量Ｂａｙｅｓｉａｎ动态线性模型（简记为ＭＢＤＬＭ）在递推过程中出现的方差阵不正定、精底低以及滤波发散等情况进行分析，对原有卡尔曼滤波算法加以改进，给出了比较适用的递推算法。     

Synthesis of web-like-structured ZnO cluster with strong photoluminescence intensity

A web-like-structured ZnO cluster (WLSZC) has been prepared by applying ultrasonic treatment for 70 min during the co-precipitation process. These samples were subsequently characterized by high-resolution transmission electron microscopy (TEM) and photoluminescence (PL) spectroscopy. In WLSZC, we observed homogeneous polygons, which consist of one single-crystal particle at each side. The PL intensity of the WLSZC is 8-14 times greater than that of nano-particle samples, most likely due to the resonant effect of the polygonal pores (about 100 nm wide). In addition, four blue peaks appeared in the prepared samples indicates that variable defects may be produced during the ultrasonic treatment.     

Fluctuation regime in the viscoelastic properties of block copolymer solutions

We report measurements of the dynamic shear moduli for solutions of three symmetric styrene isoprene diblock copolymers in the neutral solvent di-octyl phthalate. For each sample the concentration range was selected to extend from the disordered regime to the (lamellar) ordered state, with the emphasis placed on the intermediate regime, where large amplitude composition fluctuations are clearly evident. Temperatures from 0° to nearly 100°C were employed. The fluctuations were most clearly revealed when the data were plotted as phase angle versus reduced frequency, where the frequency axis was scaled by the longest relaxation time in the absence of fluctuations. The dynamic shear moduli and the apparent longest relaxation times, all normalized to their respective values in the absence of fluctuations, increased markedly as the order-disorder transition was approached. The rate of increase was consistent with recent theoretical predictions of Fredrickson, Larson, and Helfand, but the magnitude of the effect is larger than anticipated by theory. The onset of visible fluctuation effects depends on molecular weight in a manner that suggests that entanglements play an important role in determining the coupling of the fluctuations to the viscoelastic properties. This is consistent with previous measurements of translational diffusion, which demonstrated that entanglements severely diminish the mobility of lamellar-forming block copolymers along the interfaces between microdomains.Dedicated to Prof. John D. Ferry on the occasion of his 85th birthday.     

短穗柽柳幼苗形态解剖结构观察

柽柳（ＴａｍａｒｉｘＳｐｐ．）在荒漠的非河岸区自然侵移现象已被发现，本文试图通过对短穗柽柳（ＴａｍａｒｉｘＬａｘａ）幼苗在生长发育过程中形态解剖结构变化规律的研究，探讨柽柳在沙漠非河岸区自然侵移定居成功的内部形态的适应特征，幼苗自５月萌发至９月，叶面积由２．９１ｍｍ＾２减小到０．８０ｍｍ＾２，栅栏组织细胞排列由疏松到紧密，栅栏组织厚度由５４．５μｍ，增至８６．０μｍ，维管束／茎半径的比值由２５．３     

可靠性网络中费用最小化问题的一种新的分枝定界算法

本文对可靠性网络中串-并系统的费用最小化问题提出一种新的分枝定界算法.我们根据这类网络的特殊结构和性质,建立了新的最优性必要条件,在分枝搜索过程中增加新的剪枝准则,从而加速了算法的收敛速度.有效的数值试验表明,该算法可求解大规模可靠性网络的费用最小化问题.     

正链烷烃的表面张力与碳原子数之间的定量关系

不同温度下，正链烷烃的表面张力与碳原子数间定量关系可表示为：由该式计算的结果与文献值吻合，并分析讨论了式中各系数的物理意义．     

Propagation of a flattened Gaussian beam through multi-apertured optical ABCD systems

By expanding the hard-aperture function into a finite sum of complex Gaussian functions, the recurrence propagation formula of a flattened Gaussian beam through multi-apertured optical ABCD systems is derived, and the propagation of a Gaussian beam is regarded as a special case in our theoretical model. The extension to the three-dimensional case is described. Numerical examples of the beam propagation through a multiple aperture-lens system and an aperture-spatial filter are given and compared with those by the straightforward numerical integration of the Collins formula. It is shown that our analytical results give a good trade-off between the computational time and accuracy, and provide a useful tool for simulating the beam propagation through complicated optical systems including multiple apertures and spatial filters. Finally, a comparison with the previous work is made and the main results obtained in this paper are summarized.