18. We discuss the problem of portfolio investment with risk minimization subject to nonnegative investment proportional coefficient.
本文讨论基于最小路径和最小割集的复杂系统可靠性的描述与计算问题。
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19. Based on this result, the spectral decomposition theorems are proved by using permutation canonical forms of nonnegative matrices.
在此基础上，利用非负方阵的置换标准形证明了谱分解定理。
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20. In this paper, we discuss the problem of optimal combination forecasting subject to nonnegative investment proportional coefficient.
研究非负权系数约束下的最优组合预测问题。
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21. One of well-known results is that the greatest eigenvalue of a nonnegative matrix lies between the smallest and the largest row sum.
一个著名的结果是一个非负矩阵的最大特征值在它的最小行和与最大行和之间。
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22. We propose a new trust region algorithm for special linear inequality constrained optimization problems with nonnegative bound constraints.
对一类带有非负边界约束的线性不等式约束优化问题进行了研究，提出了一种新的信赖域算法。
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23. Secondly, we discuss the problem of decomposing a nonnegative matrix into a product of fully indecomposable nonnegative matrices in chapter 2.
其次，在第二章中，我们讨论了将一个非负矩阵分解成有限多个完全不可分非负阵的乘积的问题。
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24. Inspired by the nonnegative matrix factorization algorithm, we put forward an fuzzy text clustering method based on nonnegative factor analysis.
本文借助于非负矩阵分解算法，提出了一种基于非负因子分析的模糊文本聚类方法。
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25. By using a direct analysis technique, the existence of nonnegative solutions was established for singular semi-positone problems with p-Laplacian.
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。
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26. The paper gives a simple version and progress of the open Riemannian manifolds with nonnegative Ricci curvature and large volume growth from 1990.
在本文中，我们主要研究具有非负曲率完备非紧流形的体积增长与闭测地线及距离函数临界点一些关系。
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27. Besides, this paper gives a sufficient and necessary condition of the existence of normal process under the strictly nonnegative definiteness condition.
此外本文还给出了严格非负定条件下实正态过程存在的一个充要条件。
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28. The paper raises and proves an essential condition of volumetric property of nonnegative secondary estimation of deviation and variance in linear model.
文中给出并证明了在椭球约束条件下线性模型中，误差方差的非负二次估计的可容许性问题的一个必要条件。
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29. A parabolic system with nonlinear boundary conditions is considered. T he existence and uniqueness of a nonnegative classical solution are proved to this problem.
考虑了一个具有非线性边界条件的抛物系统，证明了这个问题非负古典解的存在唯一性。
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30. Thus the large time behaviors of partial nonnegative solutions of P(1) are cleared up. As an application, some valuable results in Population Dynamics are obtained.
