青皇岛市青龙县城工程场地地震危险性分析

本文以秦皇岛市青龙县城工程场地为例，采用Ａ·Ｄｅｒ·Ｋｉｕｒｅｇｈｉａｎ和Ａ·Ｈ－ＳＡｎｇ断层－破裂模型，通过潜在震源识别及震源区划分、地震动参数确定、地震动衰减公式计算模型建立及不确定性校正、场地地震危险性评定等思路和方法，对该场地进行了地震危险性分析和评定。结果认为，该场地建筑物按５０年使用期，地震烈度为６．７２度，其地面峰值加速度为０．１０３ｇ；一般建筑物按Ⅵ度烈度设防，重要建筑则按Ⅶ度烈度设防；可能产生的Ⅷ度烈度主要来自西南方向的唐山地震区。     

地脉动在泉州市区地基土层场地评价中的应用

根据实际观测资料研究了泉州市区的地脉动特征以及脉动频谱特性与场地有关参数之间的关系。结果表明,地面脉动卓越周期的变化与场地土层构造有关,与场地工程地质条件的变化相对应。测试结果反映了地基土刚度(剪切波速)的变化与场地覆盖层厚度的大小有关。认为覆盖层厚度是影响地脉动卓越周期的重要原因。     

Prioritizing conservation potential of arid-land montane natural springs and associated riparian areas

Using inventory data and input from natural resource professionals, we developed a classification system that categorizes conservation potential for montane natural springs. This system contains 18 classes based on the presence of a riparian patch, wetland species, surface water, and evidence of human activity. We measured physical and biological components of 276 montane springs in the Oscura Mountains above 1450 m and the San Andres Mountains above 1300 m in southern New Mexico. Two of the 18 classes were not represented during the inventory, indicating the system applies to conditions beyond the montane springs in our study area. The class type observed most often (73 springs) had a riparian patch, perennial surface water, and human evidence. We assessed our system in relation to 13 other wetland and riparian classification systems regarding approach, area of applicability, intended users, validation, ease of use, and examination of system response. Our classification can be used to rapidly assess priority of conservation potential for isolated riparian sites, especially springs, in arid landscapes. We recommend (1) including this classification in conservation planning, (2) removing deleterious structures from high-priority sites, and (3) assessing efficiency and use of this classification scheme elsewhere.     

Stability analysis of left bank at Tengzigou Hydropower Station

The stability analysis is one of the chief problems at hydropower stations. The Tengzigou Hydropower Station is a significant project in Southwest China. The authors analyzed the engineering geological features and evaluated the stability of rock mass on left bank. For determining the parameters of rock mass stability on left bank, we adopted the method of numerical value calculation according to the theory of rigidity limited equilibrium, which will provide the theoretical evidences for this project.     

县市级义务教育学校区位配置优化设计与实验

 合理规划学校布局是实现义务教育均衡发展和落实就近入学政策的一个重要途径。为满足县市级中小学校空间布局规划需求,本文以区位配置优化方法解决学校区位选址问题。以平均入学距离为目标,以学校总数、学校学额为约束条件,分别构建P中值指派规划和整型规划数学模型。根据学校与居民地之间的空间分布特征进行模型简化,使模型计算效率大幅度提升。因指派规划模型约束矩阵每列非零元素不超过2个,分枝切割算法能获得近似最优解(与最优目标之差小于0.01%);整型规划模型约束矩阵近似于完全单位模矩阵,分枝切割算法通常能获得最优解。在ArcGIS 10 Geoprocessing框架中,整合ArcGIS网络分析、Coin-or Python线性规划建模工具PuLP 1.4.7和线性规划软件Cplex 12,实现模型建模、模型解算和优化结果可视化。在配置Intel 酷睿2双核2.44GHz CPU和2GB内存的计算机环境中,对于有1276个居民点和50所学校的县域进行网络分析、模型建模、模型结算和结果输出。优化结果表明:学校布局调整后学生平均入学距离明显降低,本文构建的优化模型在县市级较大规模的学校选址规划中具有实用价值。     

High-altitude wind velocity at Oukaimeden observatory

This paper aims at studying the wind at 200 mbar over the Moroccan observatory Oukaimeden, as high-altitude winds have been adopted as a useful parameter for site characterization in terms of the suitability of a site for the development of some adaptive optics techniques. The data used come from the National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data base, which is widely acknowledged as being reliable. Statistical analyses of 200-mbar wind speed since 1983 are performed. Comparison with some of the main observatory sites worldwide qualifies Oukaimeden as one of the best observatory sites in terms of 200-mbar wind statistics. Our analysis of a record of seeing measurements during the years 2003 and 2004 concludes that while 200-mbar wind speed can be used as a parameter for ranking astronomical sites in term of their suitability for adaptive optics, it cannot be used for the whole atmospheric seeing prediction. A comparison of monthly values of the seeing parameter at Oukaimeden, La Silla and Paranal demonstrates the high seeing quality of Oukaimeden, as the seeing values measured were lower than those of La Silla and Paranal for most of the time during the comparison period. Furthermore, a statistical analysis of atmospheric stratified seeing, wavefront coherence time and isoplanatic angle measured with a Multi-Aperture Scintillation Sensor instrument over Paranal from 2004 to 2007 have been performed. We found good correlations between 200-mbar wind velocity and levels 4, 5 and 6 seeing, wavefront coherence time and isoplanatic angle, with corresponding correlation coefficients of 0.74, 0.79, 0.70, 0.97 and 0.78.     

Site effects in Mexico City urban zone. A complementary study

Site effects are a major factor affecting seismic risk at Mexico City conurbation and have been carefully studied. However, most of the studies and instrumentation concentrate in Mexico City. We present an evaluation of site effects in the counties of Estado de Mexico, to the North of Mexico City, that have been incorporated into Mexico City conurbation. We measured microtremors at 67 points and operated a temporal digital seismograph network. Our results allow us to extend the dominant period map of Mexico City to the heavily populated and industrialized counties of Estado de Mexico. Additionally, we propose a map of maximum relative amplification. Both maps are consistent with local geology, and could be useful for microzonation of this region.     

云南的圣境及其在环境和生物多样性保护中的意义

圣境是由于传统的信仰文化的原因而建立和被保护的一类特殊自然－人文景观单元，对圣境的起源、分类在云南的分布和数目、生态价值和其它特征进行了描述和举例分析，提出了传统信仰文化和将乡土保护体系运用于农村生态恢复和生态多样性管理的潜在价值。以及将其纳入现代保护和开发项目的必要性。