回潮率对织物红外反射性能的影响研究

介绍了含水织物受红外辐照时 ,其回潮率对其表面反射红外辐出度的影响 ,并探讨了不同红外辐射主波长与反射辐出度的关系     

青岛沿海岛屿生物多样性研究(Ⅱ)山茶(Camellia japonica)种群分布格局

应用泊松分布、负二项分布和奈曼分布三种理论分布模型，对取自长门岩岛的山茶种群的样方资料进行了分布格局的研究．结果表明，该种群的实际频数符合负二项分布，因此判定种群的分布格局为聚集分布．通过对种群的聚集强度指数的计算，求得各参数分别为二项参数（Ｋ）０．６２９１，扩散系数（Ｃ）１７．７３７２，丛生指标（Ｉ）１６．７３７２，Ｃａｓｉｅ指标（１／Ｋ）１．５８９６，聚块性指标为（ｍ／ｍ）２．５８９６，均表明为强聚集分布．     

稻粉虱Aleurooybotus indicus种群系统动态的模糊聚类分析

本文应用模糊聚类分析方法对稻粉虱Aleurooybotus indicus David of Subramanias种群系统动态进行模糊聚类分析,模糊聚类分析结果表明,在置信水平0.9640≤λi<0.9880的情况下,该种群系统分为6个亚系统:SS1、SS2、SS3、SS4、SS5和SS6。文中对各个亚系统的动态规律进行特征描述,以期为稻粉虱的综合防治提供理论依据。     

15-17世纪中国商品大潮中的户口流失

１５—１７世纪户口流失是中国历史上一个奇特的现象。造成这种现象的主要原因是商品经济的发展减弱了农民对土地的依赖程度，导致大批农民弃农经商。直接后果是造成户口流失地区出现女多男少的现象；非农业生产人口的大量增加；商业城镇的兴起及城镇居民的大量增加。商品经济越发展，户口流失越严重，两者在地区分布上具有一致性。     

纺织品白色试样的色度评价——均匀白度公式

运用颜色理论,以Canz的研究结果为基础,提出了均匀白度公式。研究结果表明它在视觉相关性、均匀性及适用性等方面明显优于CIE推荐的白度公式。     

中立型对数种群模型的周期正解

本文研究中立型对数种群模型　　　　　用重合度理论，获得了至少存在一个周期正解的充分条件．     

CHAOS IN AN INDIVIDUAL-LEVEL PREDATOR-PREY MODEL

A deterministic predator-prey model describing populations as collections of autonomous individuals was used to investigate population dynamics as an emergent property of individual behaviors and actions in a simulated environment. The model's behavior was clearly chaotic for both the two species interaction and for the prey population alone. Furthermore, estimated parameters from a simple difference equation model fitted to the single-species simulation were nowhere near the chaotic region for the equation. Findings indicate that chaos may very well be characteristic of biological populations despite the findings of several empirical studies in the past, and that chaotic models can be constructed from direct observation of, and experimentation with, biological populations by focusing on individuals and their behaviors, rather than on population parameters.     

广义α_1对角占优矩阵的判定准则

广义α1对角占优矩阵在数学、系统理论、弹性力学等诸多领域有着广泛的应用,但若是想判定一个矩阵是否是广义α1对角占优矩阵却是比较困难.利用构造的方法,通过对矩阵行标做划分,给出了判定广义α1对角占优矩阵的简洁方法.     

两类两种群动力学方程的稳定性分析

本文研究两种群动力学方程平衡点的稳定性.讨论两个捕食者-食饵-领地模型,模型用1微分方程描述,模型2用积分微分方程描述.得出平衡点稳定的条件.所得结果指出可实现总体的种群稳定而不管局部的绝灭.     

Determination of atomic valence indices from population analyses at correlated level

This work carries out a study of atomic valences within molecular systems based on Mulliken and topological population analyses at correlated level. The use of the unpaired electron densities leads to suitable relationships between valences, free valence indices, and bond indices, which turn out to be quite useful for computational purposes. The results arising from both methods at correlated and uncorrelated levels are compared in a large series of chemical compounds. Several interesting conclusions are drawn out and analyzed in detail.