non negative semidefinite matrix是什么意思

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A new kind algorithm of Kriging based on the Linear Programming (LP)is proposed to take the constrains of nonnegative weights into consideration,and this new method not only makes the use of LP's properties of easy and fast caculation,but also avoids the heavy caculation and subjective affection that existed in the other methods with nonnegative weights.

基于线性规划方法提出了一种考虑权值非负约束的克立格算法，该算法既利用了线性规划求解简便、快捷的优点，又克服了其它正克立格法计算工作量大以及受主观因素影响的缺点。

The existence and uniqueness of nonnegative solution for a class of age-structured SEIR epidemic model;

年龄结构的SEIR流行病模型非负解的存在唯一性

By using pure analysis method,are proved the monotone stability,existence and uniqeness of a dynamic state nonnegative solution of a repairable syatem with some singleness components.

用纯分析的方法给出了一类单部件可修系统动态非负解的存在唯一性和单调稳定性证明。

This paper deals with the existence of nonnegative solutions to boundary value problems 1p(t)(p(t)y′(t))′+a(t)f(t,y(t))=0, lim t→0+ p(t)y′(t)=0=y(1) where p∈C 1 (0,1) with p>0 on (0,1),f≥0,f(t,y) is nonincreasing with respect to t for each fixed y and nondecreasing with respect to y for each fixed t, and a∈C(0,1) may change sign.

利用Schauder不动点定理和上下解方法 ,对边值问题 1p(t) (p(t) y′(t) ) +a(t) f(t,y(t) ) =0 ,limt→ 0 +p(t) y′(t) =0 =y(1)讨论非负解的存在性 。

Combinatorial structures on nonnegative matrix with zero trace;

迹为零非负矩阵的组合结构

Estimation of new bounds on the spectral radius of nonnegative matrix;

非负矩阵谱半径的一个新界值估计

The installation of "new bound" for spectral radius of nonnegative matrixs;

非负矩阵谱半径的“新界”设置

Combined the characteristics of three forecast methods,a forecast model with non-negative weights is proposed.

本文根据1998年~2005年江苏省入境旅游客源数据特征,采用BP神经网络模型、GM(1,1)模型以及指数曲线模型分别进行预测,然后结合这三种预测方法的特点,提出非负权重组合预测模型,通过实例运算的对比分析,证明组合预测模型具有很高的准确性。

Taking Cauchy convergence theorem as the basis,puts forward a new discriminance to decide convergence or divergence of two kinds of generalized integral of nonnegative function f(x),demonstrates the accuracy and effectiveness of this discriminance by proving.

以柯西收敛定理为基础,提出了非负函数f(x)的两类广义积分敛散性的一种新的判别方法,通过证明论证了该方法的正确性和有效性。

New methods for discriminating convergence of nonnegative function s infinite integral are given.

本文建立了非负函数无穷积分敛散性的几个新判别法，讨论了这些判别法所对应的比较对象，说明了它们的精细程度。