三峡库区边坡稳态3S实时工程分析系统研究

本文介绍了3S分析系统的基本概念,以及在三峡库区边坡稳态分析中的作用。阐述了三峡库区边坡稳态3S实时工程分析系统的基本框架及其研究内容。可以预见,该系统的设计与完善对于监控三峡水库库岸边坡稳定性和新建城镇建设、运行全过程的永久性预测预报,具有重要的社会意义和广阔的应用前景。     

和溪至龙岩高速公路边坡稳定性研究

本文通过对和溪至龙岩高速公路场地的地震边坡效应的稳定性分析,探讨了山区地震滑坡(崩塌)的几个潜在影响因素。     

A multi-level ecological network in the Czech Republic: Implementating the Territorial System of Ecological Stability

In the late 1970s, a concept of an ecological network in former Czechoslovakia, called the Territorial System of Ecological Stability (TSES) was formulated as a response to large-scale natural and semi-natural habitat fragmentation and loss. In the Czech Republic, the TSES concept is a part of the environmental legislation, namely of the act on the conservation of nature and the landscape. The whole system is the network of ecologically significant segments of landscape, efficiently distributed on the basis of functional and spatial criteria, covering biotic, hydrological, soil and relief conditions. It consists of biocentres, corridors and buffer zones. The TSES is established at three hierarchical levels: local, regional and supra-regional (=national). In the article, a methodology for establishing the supra-regional TSES is presented in more detail.     

潮汐汊道A-P关系中参数C和n的控制因素

与沿岸漂砂相联系的潮汐汊道系统达到均衡态时的Ａ－Ｐ关系可表示为Ａ－ＣＰ＾ｎ。根据对Ａ－Ｐ关系的模拟，本文提出在均衡条件下ｎ值必然大于１，潮汐汊道Ａ－Ｐ关系表现出弱分形现象。其原因是对应于一定强度的沿岸漂砂较小汊道以口门宽度减小，流速增大来维持均衡关系。模拟实验还表明，参数Ｃ的大小与沿岸输砂率、淡水径流量和潮汐类型有关，这些因素对参数ｎ稍有影响。前人研究有时遇到ｎ〈１的情况，这可能是由于统计分计的某     

Stability analysis of a slip-debris flow in the Ogbajala Hills of Benue State, Nigeria

A slip-debris flow occurred in the Ogbajala Hills of Benue State on 3 September, 1987 after three days of consecutive rainfall. Field measurements of the landslide showed that the slip originated on the upper one-third of the hill at a depth of 1.37 m and extended uniformly to about 50 m downslope before turning into a flow.Stability analysis of the slip using infinite slope analysis yielded a slip surface depth of 1.4 m with a perched water table that rose seven-tenths (0.7) into the thickness of the slipped soil before failure. These analysis results agree closely with field measurements and give an insight into the water table conditions that led to the failure.     

二根耦合振动弦的边界反馈稳定化问题(Ⅱ)

本文继续讨论二根耦合振动弦的边界反馈的数学模理;讨论了算子A的耗散性、予解式、半群e~(tA)及其指数稳定性。     

Non-linear stability in the generalized restricted three-body problem

The non-linear stability of the triangular equilibrium point L ₄ in the generalized restricted three-body problem has been examined. The problem is generalized in the sense that the infinitesimal body and one of the primaries have been taken as oblate spheroids. It is found that the triangular equilibrium point is stable in the range of linear stability except for three mass ratios.     

THE VERTICAL DEFORMATION BEFORE AND AFTER THE TANGSHAN EARTHQUAKE OF 1976

Based on the data of 18 times of leveling carried out during 1954 to 1985, the relative stability degrees of relevelling nodes in the Tangshan area are calculated. According to these results, the characteristics of crustal vertical deformation before and after the Tangshan Earthquake(28/7/1976,Ms =7.8) are studied. Our study indicates that probably since 1968 significant relative movements between structural blocks in that area had appeared and continued till 1978. The seismic fault wa     

虎门大桥桥塔地基基础类型及锚碇区稳定性分析

在全面阐述虎门大桥区域地质条件及桥址岩土体特征的基础上，着重讨论了悬索桥桥塔地基基础类型和桩基基础垂直载体的计算方法，另对影响威远炮台古迹的大桥东锚碇区的边坡，通过分析边坡岩体工程地质特性，结合室内外试验结果和有关公式反算上关力学参数，选择了典型的易滑剖面，逐层研究计算了边坡的稳定性参数。     

全型涡度方程和经典涡度方程比较

在简要回顾经典涡度方程和全型涡度方程推导的基础上 ,比较了两种涡度方程的异同。集中讨论全型涡度方程新的物理内涵 ,证明了与稳定度和斜压性变化 (锋生、锋消过程 )相联系的内部强迫以及与摩擦耗散和非绝热加热相联系的外部强迫所诱发的涡度发展的机制。最后 ,指出了全型涡度方程的天气和气候应用前景。