一条断裂的活动性鉴定及其工程意义

拟建的某水利工程场地存在一规模较大的北北东向断裂,定名为F1断裂.通过对F1断裂的地质雷达探测、工程地质资料分析、地震地质调查、断裂断错和上覆第四纪地层年代测试等工作,鉴定了此断裂的活动性,评价了断裂对工程的影响,提出了工程选址和设计建议,为断裂活动性鉴定在工程选址和设计中的实际应用提供了一个范例.     

场地类型对反应谱平台值的影响

文中在总结一些学者研究基础上,利用土层地震反应分析的一维等效线性化波动方法,以建筑抗震设计规范规定的反应谱为目标谱,合成不同加速度峰值和特征周期加速度时程曲线共28条,将其作为土层地震反应分析的输入地震动,选取和构造了四种场地类型的225个土层剖面,计算了不同土层剖面在不同地震动输入下的设计反应谱的平台值.基于统计分析...     

地磁DI仪基线值分析处理软件

现用前兆地磁处理软件的基线值计算功能不完善,导致观测结果滞后,从而制约了台站接收数据的及时性,影响了观测员补测时间的安排.该软件从根本上解决的接收数据的滞后性,能够及时了解观测结果,提高DI仪观测精度,减少观测次数,从而提高观测资料的内在质量.     

汉阴县生态系统服务价值变化研究

在分析1997-2007年土地利用的数量、结构和程度变化特点的基础上,参考Costanza、谢高地等人的研究成果,结合汉阴的实际情况,估算出研究区各年度生态系统服务价值并分析变化特点及其原因,结果可以看出汉阴县生态系统服务价值与经济的发展呈正相关.     

Quota concentration in the New Zealand fishery: Annual catch entitlement and the small fisher

New Zealand's quota management system (QMS) was introduced in 1986 to enhance the sustainability of New Zealand's fishery. This paper examines trends in quota and catch share concentration across a range of important fish stocks. It demonstrates that continuing concentration is occurring in the ownership of quota for deepwater species. At the same time there has been an increase in participation by small scale fishers in the inshore fishery. This appears to be driven by the introduction of the Annual Catch Entitlement (ACE) regime, allowing annual catch shares to be accessed at reduced transaction cost.     

古村落游客忠诚模型研究——基于游客感知价值及其维度视角

古村落旅游发展离不开游客的感知评价,探讨在古村落情境下的游客感知规律对古村落旅游可持续发展具有现实意义.基于游客感知价值及其维度视角,本文构建了古村落游客忠诚概念模型,并以湖南岳阳县张谷英村为例进行实证;通过探索性因子分析以及结构方程模型检验和修正,得到了古村落游客忠诚修正模型.修正模型表明,古村落游客感知价值作为单维...     

鸭绿江下游江心洲资源与鸟类保护

鸭绿江下游有江心洲53个,其中中方有13个。江心洲是鸟类南北迁徙的脚踏石,是许多动物繁殖的斑块,是城市重要的景观资源,同时也是中朝两国间的重要战略资源。中方许多大型岛屿都已被开发成工业园区、住宅、高尔夫球场或旅游度假村,旅游开发使岛上原有高耸、茂密的植被遭到破坏,相关珍稀鸟类消失,公众利益变成私有财产,暂时的经济税收取代了长久的生态价值。建议加强江心洲及相关各类资源的保护,实施森林岛屿的生态重建和修复,注重存在价值及非消耗性利用,树立保护即利用的辩证唯物主义资源价值观,使江心洲成为镶嵌在鸭绿江上的绿色宝石。     

碳酸氢钠对高温下珍珠鸡生产性能及血液pH值的影响

用１８０只５６日龄肉用仔珍珠鸡,测定了高温环境（２５～３４℃）条件下,在日粮中添加不同量的ＮａＨＣＯ３ （质量分数分别为０％ ,０．５％ ,１．０％ ,１．５％ ,２．０％ ,２．５％ ）对珍珠鸡肥育期（５６～８４日龄）生产性能及血液ｐＨ 值的影响,基础日粮含 ＭＥ １３．３７ ＭＪ／ｋｇ,ＣＰ１８％ 。结果表明：体增重、采食量、屠宰率、血液ｐＨ 值不受日粮中ＮａＨＣＯ３的显著影响（Ｐ＞ ０．０５）,但体增重、采食量、饲料利用率受性别的显著影响（Ｐ＜ ０．０５）,母鸡比公鸡的体增重大１８．８％ ,采食量高８．０２％ ,饲料利用率高９．７０％ ,公母鸡间的这种差异在１．５％ ＮａＨＣＯ３ 添加组表现最明显     

Growth and Interactions of Multi-Source Perturbations in Convection-Allowing Ensemble Forecasts

This study investigated the growth of forecast errors stemming from initial conditions (ICs), lateral boundary conditions (LBCs), and model (MO) perturbations, as well as their interactions, by conducting seven 36 h convection- allowing ensemble forecast (CAEF) experiments. Two cases, one with strong-forcing (SF) and the other with weak-forcing (WF), occurred over the Yangtze-Huai River basin (YHRB) in East China, were selected to examine the sources of uncertainties associated with perturbation growth under varying forcing backgrounds and the influence of these back- grounds on growth. The perturbations exhibited distinct characteristics in terms of temporal evolution, spatial propagation, and vertical distribution under different forcing backgrounds, indicating a dependence between perturbation growth and forcing background. A comparison of the perturbation growth in different precipitation areas revealed that IC and LBC perturbations were significantly influenced by the location of precipitation in the SF case, while MO perturbations were more responsive to convection triggering and dominated in the WF case. The vertical distribution of perturbations showed that the sources of uncertainties and the performance of perturbations varied between SF and WF cases, with LBC perturbations displaying notable case dependence. Furthermore, the interactions between perturbations were considered by exploring the added values of different source perturbations. For the SF case, the added values of IC, LBC, and MO perturbations were reflected in different forecast periods and different source uncertainties, suggesting that the combination of multi-source perturbations can yield positive interactions. In the WF case, MO perturbations provided a more accurate estimation of uncertainties downstream of the Dabie Mountain and need to be prioritized in the research on perturbation development.     

中国东部大陆岩石层壳──幔结构比值R与动力学特征

根据前人和作者最新深部地球物理探测研究成果,完成了中国东部大陆（１０５°Ｅ以东）１°×１°壳－幔结构比值Ｒ（Ｒ＝Ｃ／Ｌ,Ｃ为地壳厚度,Ｌ为岩石层厚度）分布图的编绘．研究了Ｒ值分布与东部大陆岩石层分块、大地构造形态特征;Ｒ值分布与东部大陆地震活动的非均匀性特征;Ｒ值分布的动力学内涵．结果表明：１．Ｒ值等值线特征反映了岩石层块体划分、大地构造形态,Ｒ值特征与岩石层块体划分、大地构造形态有其深部成因上的联系;２．高Ｒ值区对应地震高活动区,因而Ｒ值可作为地震区划、地震危险性评定的定量指标,Ｒ值是地震活动的动力因子．