一种提取山脊线和山谷线的新方法

提出了一种提取山脊线和山谷线的新方法。基于矢量等高线,以Mean Shift思路为全局步骤,以多因素流水模型为局部追踪依据,在提取特征点的同时完成山脊线、山谷线追踪。首先建立等高线间的拓扑关系,确立追踪起点;然后分割等高线弯曲,并依此建立虚拟扇形区域;最后,建立多因素流水模型,根据"流向最大概率"原则,追踪山脊、山谷线。实验结果表明,该方法能更加准确地提取地形特征点,增强抗噪性,并在特征点提取的同时完成山脊、山谷线的连接,大大减少运算量。     

Gas hydrate associated with mud diapirs in southern Okinawa Trough

Many mud diapirs have been recognized in southern Okinawa Trough by a multi-channel seismic surveying on R/V KEXUE I in 2001. Gas hydrates have been identified, by the seismic reflection characteristics, the velocity analysis and the impedance inversion. Geothermal heat flow around the central of the mud diapir has been determined theoretically by the Bottom Simulating Reflectors (BSRs). Comparing the BSR derived and the measured heat flow values, we infer that the BSR immediately at the top of the mud diapirs indicate the base of the saturated gas hydrate formation zone (BSGHFZ), but not, as we ordinarily know, the base of the gas hydrate stability zone (BGHSZ), which could be explained by the abnormal regional background heat flow and free gas flux associated with mud diapirs. As a result, it helps us to better understand the generation mechanism of the gas hydrates associated with mud diapirs and to predict the gas hydrate potential in the southern Okinawa Trough.     

延安城市地下空间探测技术方法及应用研究

该文选取延安市作为黄土丘陵沟壑区的典型代表,总结出侧向山体地面探测适宜采用航空摄影测量、三维基础地质调查填图等方法,垂向地下空间探测可采用工程地质钻探、随钻监测、钻孔多参数地球物理测井等技术方法,其中工程地质钻探、多参数地球物理测井对于探测黄土丘陵沟壑区地下空间效果较好.探测结果显示,延安市中心城区地下岩土体可划分为8...     

基于网络药理学和分子对接探讨麻黄附子细辛汤合肾四味汤治疗变应性鼻炎的作用机制

目的:运用网络药理学和分子对接技术探讨麻黄附子细辛汤合肾四味汤治疗变应性鼻炎(AR)的作用机制。方法：利用TCMSP数据库,获取并筛选麻黄附子细辛汤合肾四味汤的活性成分和潜在靶点;通过多个数据库挖掘AR的相关靶点,并与麻黄附子细辛汤合肾四味汤的潜在靶点取交集,获得麻黄附子细辛汤合肾四味汤治疗AR的核心靶点,同时进行蛋白质-蛋白质相互作用（PPI）网络构建,利用R语言对核心靶点进行基因本体（GO）功能和京都基因与基因组百科全书（KEGG）通路富集分析;采用分子对接技术将主要活性成分与核心靶点进行分子对接。结果：麻黄附子细辛汤合肾四味汤中的67个有效成分可以通过白细胞介素-17受体通路、Toll样受体通路、低氧诱导因子受体通路（HIF-1 Signaling Pathway）等多种受体通路治疗AR。分子对接结果显示槲皮素与基质金属蛋白酶9（MMP9）、木犀草素与白细胞介素-6大分子蛋白有良好的结合性。结论：麻黄附子细辛汤合肾四味汤可以从多靶点、多通路治疗AR,为后续研究提供了新的方向。     

2004年9月15日天津沿海潮位二次超过警戒水位的成因分析

2004年9月15日天津沿海高潮位两次超过4.70m的警戒水位,形成风暴潮灾害。着重分析了在第一次高潮位超过警戒水位后,特别是天津沿海已处于离岸风的作用下,高潮位再度超过警戒水位的原因,并对类似这种一次风暴潮过程而高潮位多次超过警戒水位的情况,针对不同的天气背景,进行历史资料的统计分析。结果表明:用超浅海开尔文波的传播理论能解释这种现象并得到了实况的验证。而且统计分析表明,台风和气旋造成的风暴潮灾害中高潮位多次超过警戒水位的现象所占的比例较高。     

对伸展域变换构造研究的两点思考

在变换构造研究现状的基础上，从概念和分类两方面提出了研究中存在的两个问题：传递带和调节带的分类不清以及变换构造带的识别问题，并对这两个问题做出了探讨。针对传递带和调节带的分类不明确、两者具体范围和边界混淆的问题，对传递带和调节带的关系作了研究；对变换构造带的识别问题，从应力机制、运动学特征和几何形态三方面论述了变换构造带和走滑断裂带的异同：     

CM4模型数据与台站实测数据的对比研究

本文利用第四代地磁场综合模型(Comprehensive Model 4,CM4),计算了1982—2002年隆尧地磁台站的磁层源磁场及其感应场、电离层源磁场及其感应场的地磁北向分量X、东向分量Y、垂直分量Z,分析了各场源磁场随时间的变化特征。磁层源磁场及其感应场呈现出11年和27天的周期性变化,有些年的27天周期性变化显著,有些年则不太显著;电离层源磁场及其感应场具有明显的季节变化,不同年相同季节的变化形态一致但幅度不同;日变化分析显示,磁静日和磁扰日期间的模型数据与台站实测数据变化一致性较好,相关性较高。     

Bibliometric Analysis of Sustainable Livelihoods Research in China

The Sustainable Livelihoods (SLs) is a significant subject and concept within the sustainable development research and it also has the potential to deal with the fundamental challenge in terms of inequalities between inter-generation and intra-generation, now and in the future. This paper adopted bibliometrics to conduct the quantitative analysis of the development, hot topics, and collaboration network in terms of SLs researches. Moreover, the analyzed parameters included publication output, distribution of publications by authors and organizations, subject classification of publication, etc. Some 809 papers were analyzed on various aspects of publication, and the results show that publication output has increased promptly over the past two decades; however, the cooperation network among different organizations and authors on the topic of SLs has not been closely linked. The hot topics of SLs involve three categories, which are ①theoretical research in terms of sustainable livelihoods; ②the research on livelihood strategy (problem-orientated); ③the research of ecological vulnerability. It is important for Chinese scholars to continue the future SLs researches in accordance with the strategy of target poverty alleviation and rural revitalization. Additionally, it is also vital to broaden the theoretical horizons by transitioning from the research on agricultural economy to the exploration of relationship of SLs-ecological environment, SLs-biodiversity, SLs-climate change and adaptation, SLs-human capital development, etc.; to strengthen the academic cooperation and exchanges; to innovate research approach; to improve both quantity and quality of research output for the purpose of providing long-term and scientific decision for the decision makers.