φ混合序列的若干收敛性质

讨论φ^～混合序列的收敛性质,得到3个完全收敛定理,将φ^～混合序列独立情形下的收敛性质较好地推广到相依情形．     

φ混合序列的几乎处处收敛性

讨论φ^～混合序列级数的收敛性,得到φ^～混合序列的几个几乎处处收敛定理,把文献[2]中ρ^～混合序列的相关收敛性质推广到φ^～混合序列．     

关于不同分布φ混合序列的加权和的强稳定性

在文献[3]的基础上讨论一类较为广泛的混合序列的一般加权和的强稳定性,推广了独立情形的Jamsion定理及相关定理.     

γ射线吸收浓度计研究

介绍γ射线吸收浓度计的工作原理，设计思想与技术要求，并给出了部分实测结果。     

ρ混合序列的不变原理

给出一类较广泛的p混合序列，证明在一定矩条件下，p混合序列的不变原理成立．所得的结果改进了已经报道的相关结果．     

Observation and dydrodynamic analysis of fast-start of yellow catfish (pelteobagrus fulvidraco)

The kinematics and hydrodynamics of the escape response of yellow catfish ( Pelteobagrus fulvidraco ) is investigated.It is observed from digital high-speed camera that all the escape response of yellow catfish is a C-type fast-start, which is characterized by the C-shape of the fish body at the end of the first contraction of the lateral musculature. Based on the analysis of the mass center movement and the performance of the caudal fin, the fast-start process can be divided into two stages: in stage one the fish body rotates rapidly around its mass center and in stage two the fish begins moving straightly. Theoretically, the Weihs' model is employed to obtain the forces, moments and turning angular accelerations acting on the fish during the escape response. The results are in good agreement with the experimental observation. Furthermore, muscle strain at different locations along the body is calculated. At last, the dynamical performance of the escape response is explained.     

λ阶短哈密顿回路的匹配法

无向权图G(n,m)的任始结点哈密顿回路可分成两条匹配半路径,根据给定λ值,用最小权路径延长法,对所有相关半路径进行匹配,便可完全确定从最短到λ阶短哈密顿回路的匹配法和相应的匹配算法.λ阶短哈密顿回路的匹配法可用于判别权图G(n,m)是否为哈密顿图.     

Synthesis of biodiesel from rapeseed oil using K2O/ γ -Al2O3 as nano-solid-base catalyst

Nano-solid-base catalyst K₂O/γ-Al₂O₃ was prepared and adopted for the synthesis of biodiesel by transesterification of rapeseed oil with methanol. The particle diameter of the catalyst was about 50 nm, which was measured by transmission electron microscopy (TEM). The variables affecting the yield of biodiesel during transesterification, such as mass ratio of KNO₃ to γ-Al₂O₃, calcination temperature, calcination time, and catalyst content, molar ratio of methanol to oil, reaction temperature and reaction time were investigated. The catalyst obtained by calcining a mixture of KNO₃ and γ-Al₂O₃ at 600 °C for 3 h, was found to be the optimum one, which gave the highest catalytic activity in reaction. With 3% (m _catalyst/m _oil) catalyst, when the transesterification carried out at a molar ratio of methanol to oil 12:1, a reaction temperature of 70 °C, and a reaction time of 3 h, yield of 94% was achieved. Foundation item: Supported by the National High-Technology Research and Development Program of China (863 Program) (2007AA100703)     

λ阶短哈密顿回路的最小权法

提出短哈密顿回路的概念，分析由延长而形成最短哈密顿回路的特点，得出求权图G(n，m)λ阶短哈密顿回路的最小权法，该最小权法不但可精确求得最短和其它阶的短哈密顿回路，而且可用于权图G(n，m)的判别，得出求λ阶短路径的最小权法。     

ρ混合阵列行加权和的L2收敛性

讨论(～ρ)混合阵列行加权和在Cesàro一致可积条件下,或者在更为广泛条件下的L2收敛性,改进并推广了鞅差阵列行加权和的相应结果.     

不同分布ρ混合序列部分和的强收敛性

讨论不同分布(ρ~)混合序列部分和的强收敛性,所得结果推广和改进了文献[2]的结论,将同分布推广到不同分布.     

1 < α < 2阶非线性分数阶微分方程解的渐近稳定性

主要讨论了一类阶数为1＜α＜2的非线性分数阶微分方程解的渐近稳定性.这类方程首先被转化为带有分数次积分扰动的常微分方程,进而运用Banach压缩映照原理,建立了一些保证这类方程的解渐近稳定的充分条件,围绕非线性分数阶微分方程的稳定性分析进行了新的尝试.最后通过举例说明该方法的有效性.     

差分方程xn+1=(α+βxn+γxn-1)/(A+Bxn+Cxn-1)两个猜想的证明

证明差分方程xn 1=α βxn γxn-1A B xn Cxn-1,n=0,1,…当C∈(0, ∞)时每个非负解是有界的.     

网络中λ阶短路径的构造原则及算法

分析由延长而产生的前导和后继路径阶的生成关系,获得λ阶短路径的构造原则,然后根据构造原则,修改最短路径D(Dijkstre)算法,提出λ阶短路径D算法,并用算例验证算法的可行性.     

Lp(［0,1］)-characterizations of multi-knot piecewise linear spectral sequences

There exists a class of new orthonormal basis for L²(［0,1］), whose exponential parts are multi-knot piecewise linear functions called spectral sequences. In this paper, we show that these bases constitute bases, but not unconditional bases, for L^p(［0,1］) with 1＜p＜∞, p≠2. In addition, we give the corresponding convergence theorem in L^p, Carleson-Hunt theorem on almost everywhere convergence, Littlewood-Paley theorem and Poisson summation formula related to these bases.     

Lp(［0,1］)-characterizations of multi-knot piecewise linear spectral sequences

There exists a class of new orthonormal basis for L²(［0,1］), whose exponential parts are multi-knot piecewise linear functions called spectral sequences. In this paper, we show that these bases constitute bases, but not unconditional bases, for L^p(［0,1］) with 1＜p＜∞, p≠2. In addition, we give the corresponding convergence theorem in L^p, Carleson-Hunt theorem on almost everywhere convergence, Littlewood-Paley theorem and Poisson summation formula related to these bases.     

收缩临界κ连通图中阶较小端片的基数

设G是收缩临界κ连通图,κ=4q r(0≤r≤2,q≥2),证明如果G的原子A的阶为q-1,则G中存在另一个与A不相交的端片B,使得B≤q.     

集值优化问题ε－强有效解的最优性条件

引入集值映射ε-强有效次梯度和ε-强有效次微分的概念.在一定条件下得到该次微分的存在性定理,讨论该次微分的一些性质.作为应用,对于一类特殊的参数扰动优化问题,研究其在ε-强有效意义下的稳定性.