出土墓志所见长治地区的清河崔氏

长治地区出土的关于崔氏的墓志与北魏时期清河崔氏有密切的关联,清河崔氏在西晋末年十六国时期移居长治地区,入隋唐以后仍留居此地。     

云南纵向岭谷区生态安全评价及影响因素分析

根据云南纵向岭谷区生态环境特点,按照层次分析法建立了生态安全评价指标体系.在应用综合指数法评价云南纵向岭谷区生态安全的基础上,引进灰色系统理论的灰色关联分析方法对影响纵向岭谷区14个地、州、市的生态安全主导因素进行了分析评价.研究表明:云南纵向岭谷区生态安全总体状况良好,植被覆盖度、人口自然增长率、水量变化、产业结构、人口素质、水土流失率和开发土地比例是影响生态安全的主要因素;纵向岭谷区内各区域和流域之间生态安全状况存在差异,生态安全综合指数较高的区域和流域分别是西部地区和怒江流域.针对各个地区生态安全状况的差异及影响因素的不同,该区域应因地制宜地进行生态环境管理,保障自然、经济、生态环境协调发展.     

An endpoint damage oriented model for life cycle environmental impact assessment of buildings in China

The midpoint impact assessment methodology and several weighting methods that are currently used by most building Life cycle assessment （LCA） researchers in China, still have some shortcomings. In order to make the evaluation results have better temporal and spatial applicability, the endpoint impact assessment methodology was adopted in this paper. Based on the endpoint damage oriented concept, four endpoints of resource exhaustion, energy exhaustion, human health damage and ecosystem damage were selected according to the situation of China and the specialties of the building industry. Subsequently the formula for calculating each endpoint, the background value for normalization and the weighting factors were defined. Following that, an endpoint damage oriented model to evaluate the life cycle environmental impact of buildings in China was established. This model can produce an in- tegrated indicator for environmental impact, and consequently provides references for directing the sustainable building design.     

小扰动稳定域边界的超平面拟合及应用

依据在同一主导振荡模式下稳定域边界保持连续光滑的特性,提出了利用超平面的形式近似表示稳定域边界的建议．算例表明,超平面拟合的误差可以满足工程应用的要求．针对由于主导振荡模式跳跃造成稳定域边界几何形状突变的现象,提出了一种分类拟合策略,提高了稳定域边界对应多个主导振荡模式时超平面拟合的精度．最后,在全国联网系统中验证了所提算法的有效性．     

混凝土破裂过程细观损伤与渗流耦合模拟

假定混凝土是由骨料、砂浆、界面和随机微缺陷组成的四相复合材料,并据此假定建立了混凝土四相复合材料的细观力学模型,导出了混凝土弹塑性损伤-渗流耦合本构方程,同时数值模拟了试样破裂过程,基于细观尺度研究了混凝土弹塑性损伤-渗流耦合问题.结果表明:混凝土渗透系数的变化与混凝土试样弹塑性损伤破裂全过程密切相关;破坏的细观单元成为渗流的主要通道.     

等式约束优化问题的非单调信赖域算法

本文就等式约束优化问题,结合当前比较流行的非单调技术,提出了一种求解等式约束优化的非单调信赖域算法.在没有正则性条件的假设下我们证明了算法是有定义的。     

LA-ICP-MS dating of Zhangjiakou Formation volcanic rocks in the Zhangjiakou region and its geological significance

The geological cross section of the Zhangjiakou Formation is originally established in the Zhangjiakou region. From the dating of four samples from typical cross sections of the Zhangjiakou Formation in the Zhangjiakou region, the age range is found to be mainly from 143.0 ± 3.7 Myr to 136.1 ± 1.4 Myr, which almost equals the sum of the age range of the Zhangjiakou Formation （136-135 Myr） and that of the Tuchengzi Formation （143-136 Myr） in the Luanping region, and the Zhangjiakou and Tuchengzi Formations in Zhang- jiakou-Luanping of North Hebei are found to be conformable. The evidence above indicates that the Zhangjiakou and Tuchengzi Formations, which are distributed in Zhangjiakou-Luanping, were formed under the same geological setting. Volcanic activity was earlier and longer （143-136 Myr） in the western region （Zhangjiakou） than that in the eastern region （Luanping）. The ＂Zhangjiakou Formation＂ in Chengde and Pingquan formed in the period in which the Yixian Formation in West Liaoning formed, so should be renamed the Yixian Formation.     

乡镇图书馆发展模式探讨——以华中地区为例

乡镇图书馆是公共图书馆的一部分,要为全乡镇的政治、经济、文化教育、科研生产服务,华中地区乡镇图书馆发展面临功能定位不清、发展路径模糊以及经费短缺等问题,要克服这些限制和瓶颈,有多种发展模式可供选择。     

损伤定位中应变模态指标的改进研究

由于传统的应变模态差指标峰值大小随损伤程度而变化,在利用应变模态差指标作为神经网络输入来识别损伤位置时,就很可能产生误判,为消除损伤程度对应变模态差指标的影响,对应变模态差指标进行改进,给予理论证明,并通过悬臂梁数值仿真算例进行验证.验证结果表明,所建议的改进方法指标与理论研究一致.     

基于正域的决策树构造方法

决策树是数据挖掘中的一种重要分类方法。在此以粗糙集理论中的正域为启发式函数,设计了一种新的、有效的决策树构造方法。该算法具有较大的灵活性,能从测试属性空间逐次删除已使用过的属性。避免对这些属性进行重复测试,减少测试空间,降低了树的复杂性,从而提高了分类效率。最后,实例验证了算法的可行性与有效性。