Present-Day crustal deformation field in China continent inverted from GPS observations, earthquake moment tensor and quaternary fault slip rates

Based on the bi-cubic Bessel spline function method, we have inverted the present-day crustal horizontal velocity field and deformation field in China continent by combining with 410 GPS observations, 327 seismic moment tensors of earthquakes and fault slip rates in China and its neighboring areas, and considered the geological and geophysical parameters at the same time. The results reveal that the crustal movement mostly takes on compression in SN-NE direction and extension in EW-NW direction in China continent. The continent is rotating southeast and takes on a clockwise rotation image from the west to the east, particularly in the southeast of Tibet and Chuan-dian area. Different blocks have different deformation in China continent. The south China, Ordos and Northeast block have good integrity.The deformation in the western part of China is obviously stronger than that in the eastern part. The strong strains are focused on the Himalaya, east Tibet,west Tian Shan and Chuandian block etc. The deformation at the joint of blocks is stronger than that within the blocks. The China continent deformation not only has the strike-slip faulting and extrusion feature but also has the crustal shortening and thickening feature.     

A Study on Forest Species Diversity and Its Ecological Service Function in the Plateau Area of Western Sichuan

This paper presents a study on species diversity and its ecological service function in the plateau area in western Sichuan. The results show that species diversity in the plantations on the cutover land has a tendency to increase and that its ecological service function is to be improved with stand age growing. The species diversity in forest communities is also gradually increased on different succession stage till reaching a climax level. But the species diversity in the climax community is slightly decreased before it reaches a relatively constant status. Ecological service function of diversity is gradually strengthened with the progress of succession. In addition, species diversity in a stand in a similar site and at a same age differs among forest types. Species diversity index within a coniferous and broad-leaved mixed forest is larger than that within a coniferous forest. Meanwhile, species diversity enriches as the tree density increases.     

一般正态分布的W特征函数和矩

本文得出了一般正态分布的W特征函数和矩;两个独立的二进正态随机变量的二进和的W特征函数和矩;二元正态分布的W特征函数和矩.     

关于致密天体内部的格林函数

利用Jellium模型，根据量子统计理论讨论了致密天体的格林函数，得出的结果对一般致密天体可能是适用的。     

强连续余弦算子函数的不可约性

讨论了强连续余弦算子函数的不可约性及其共轭扰动余弦算子函数的不可约性,建立了以下两个结果:1)设(X,‖·‖)为Banach格,{C(t)}t≥0是正的强连续余弦算子函数,B∈B(X,XΘ)是一个正算子,那么,扰动余弦算子函数{CB(t)}t≥0是不可约的充要条件为:J={0}及J=x是仅有的满足C(t)J J,K(λ)J J的闭理想,这里t≥0,K(λ)=R(λ2,AΘ)B.2)设{C(t)}t≥0是Banach格上的具有生成元为A的正余弦算子函数,则以下论断等价:①{C(t)}是不可约的;② 0>0;③对λ>S(A),R(λ2,A)是强不可约的;④对λ>S(A),R(λ2,A)是不可约的.     

基于灰色聚类的水质评价方法

在论述灰色聚类方法原理的基础上，以东江河源段水质评价为实例，探讨了灰色聚类法在水质评价中的应用．     

消费者行为分析中贴现因子的确定方法研究

在比较固定贴现因子法及参数评估法的基础上，提出了用异质偏好函数法来确定贴现因子，并用实际的数据库验证了异质偏好函数法确定贴现因子在消费者行为模型的适应性方面比前两种方法优越，还讨论了三种方法的使用原则。另外，还提出了在考虑客户偏好异质性时，消费者行为建模所应考虑的主要变量。     

Kemeny社会选择函数的一种改进算法

Kemeny函数是群决策中的一种社会选择函数.当候选人和投票人较多时,Kemeny函数的计算量很大,这为Kemeny函数的研究和应用带来很大的困难.对Kemeny函数的算法作了一些改进,然后利用数学软件Matlab编写了计算Kemeny函数的程序,并用该程序计算了文献[2,3]中列举的一个选举问题的所有Kemeny函数值.提出的改进算法和Matlab程序较好地解决了Kemeny函数计算的问题.     

具有局部搜索能力的自适应变异遗传算法

针对函数优化问题，提出一种自适应变异遗传算法来提高局部搜索的能力，弥补简单遗传算法易于早熟收敛的缺陷。最后以De Jong函数为仿真对象，将此算法与其它三种遗传算法进行比较，仿真结果表明此算法对于函数优化问题非常有效，大大加快了算法的收敛速度，并大幅度提高了搜寻到最优解的概率。     

计算机模拟的认知功能及其可能性

尽管计算机模拟实现了人类认知功能的物化，也为揭示人类认知活动机理开辟了新的途径，但学术界对认知功能的计算机模拟仍存在不同评价。为此，本文从理论层面对认知模拟作了辩证分析，在肯定其具有三项意义的同时，也指出其无法克服的诸多局限。笔者认为，客观评价认知功能的计算机模拟，有助于认知科学家在理论研究中尽早揭示和了解人类认知的规律与机制，在应用研究中能牢牢把握智能模拟的正确方向。