基于简译的高分辨率卫星影像信息提取研究

利用简译遥感信息提取软件,以资源三号高分辨率卫星影像为数据源,选取老挝首都万象市为研究区,采用分层信息提取思想,在道路、建筑等地表覆盖要素人工提取结果的基础上,对未分类地物(水田、旱地、林地、工矿用地),利用最小距离算法和深度学习算法进行信息提取研究.研究结果表明,基于最小距离算法的总体分类精度为85.7％,Kappa...     

考虑土-结构相互作用双层柱面网壳在多点输入下的地震反应分析

目前对于网壳结构的地震反应研究大部分仍然采用一致输入,特别是没有考虑土-结构相互作用对网壳结构的影响。本文通过对大型有限元分析软件MSC.Nastran的二次开发,用等效线性化方法考虑土体的非线性,对土体采用三维实体单元建模,并对土体在基岩面上采用地震动的多点输入,计算分析了大跨度双层柱面网壳的动力反应,并且与一致地震动输入下网壳结构的地震反应进行了对比,考察了两者之间的差异,深入分析了考虑土-结构相互作用下,双层柱面网壳结构在多点输入和一致输入下的地震反应规律,并得出了一些重要结论。     

西藏自治区革吉县米多南地区欧利组厘定的古生物证据及其意义

研究区位于羌塘地块与班公湖—怒江结合带交汇处,保存有一套晚侏罗世—早白垩世海相沉积记录,是研究晚侏罗世—早白垩世班公湖—怒江特提斯洋沉积环境演化及其沉积盆地类型的理想地区。通过对岩性组合、沉积环境、古生物化石等方面进行研究,厘定出欧利组,并探讨了欧利组时代归属及沉积盆地类型。根据欧利组中发现的小光星珊瑚、轮形异通珊瑚、米契林柱剑珊瑚、安多准柱剑珊瑚等化石,确定欧利组时代为晚侏罗世。初步分析沉积环境为局限台地-潮坪沉积,局部具潮汐水道沉积,沉积相分析表明研究区晚侏罗世—早白垩世沉积盆地类型为弧后前陆盆地。     

Sliding element simulating the response of slip surfaces and its application for the prediction of earthquake-induced landslide movement using one-dimensional dynamic analyses

Landslides - Earthquake-induced landslides involve excessive movement of slopes, usually along slip surfaces. This seismic movement of slopes may depend crucially on (a) the soil response along the...     

The Ferrara hard X-ray facility for testing/calibrating hard X-ray focusing telescopes

We will report on the current configuration of the X-ray facility of the University of Ferrara recently used to perform reflectivity tests of mosaic crystals and to calibrate the experiment JEM–X aboard Integral. The facility is now located in the technological campus of the University of Ferrara in a new building (named LARIX laboratory= ̳LARge ̳Italian ̳X-ray facility) that includes a tunnel 100 m long with, on the sides, two large experimental rooms. The facility is being improved for determining the optical axis of mosaic crystals in Laue configuration, for calibrating Laue lenses and hard X-ray mirror prototypes.     

自由测站边角交会网在工程中的应用

鉴于自由测站边角交会网具有网形规则、可靠性高、多余观测数多和观测时无需对中等优点,提出将自由测站边角交会网应用于长大隧道洞内平面控制、基坑水平位移监测和有砟轨道CPⅢ平面网建网中。研究结果表明,将自由测站边角交会网应用于上述工程中都能在一定程度上克服传统方法的不足,提高测量效率和精度,值得推广使用。     

Distribution patterns of interstitial polychaetes in sandy beaches of southern Brazil

This study describes the distribution patterns of interstitial polychaetes along morphodynamic gradients on six exposed sandy beaches in Santa Catarina and Paraná (South Brazil). Three random transects were sampled at two points on each beach, one at the swash and another at the surf zone, in winter and summer conditions. Six sediment replicates were collected at each sampling point using a corer of 4.6 cm internal diameter that removed 10 cm into the sediment. Abundance and composition of interstitial polychaete were correlated to wave height, slope, grain size, CaCO₃, chlorophyll a , omega indexes, temperature and relative tide range using a canonical correspondence analysis (CCA). A factorial ANOVA showed that taxa richness, mean density and Shannon's diversity were significantly higher at the reflective beaches, but average values differ significantly between transects and these differences change according to the beach zones on both sampling dates. PERMANOVA showed that polychaete associations differ among transects according to the beach zones. The composition of interstitial polychaete associations was significantly correlated to beach morphodynamics and features (P < 0.01). Polychaete associations of reflective beaches were more diverse than in other morphodynamic states. Intermediate beaches may also sustain diverse associations due to temporal variability of the morphodynamic patterns. Beaches presenting extreme dissipative morphodynamics and compacted sediments appear to be unfavourable for the occurrence of interstitial polychaetes.     

巴里坤盆地晚古生代火山岩年代学及构造演化

与周缘相邻的含油气盆地相比,前人对巴里坤盆地的研究少之又少,对其认识也不够完善;特别是由于缺乏化石及年代学资料,对研究基础的地层划分方案也一直存在争议.本文通过LA-ICP-MS单颗粒锆石U-Pb同位素测年方法对盆内Bal井岩心取样的凝灰岩进行了年代学测定,依据测定结果并结合地震反射同相轴特征对巴里坤盆地的地层重新进行...     

辽宁省海洋经济系统协调发展研究

通过构建海洋经济系统协调发展评价指标体系,采用模糊数学中隶属度函数模型,分析了辽宁省海洋经济系统发展水平及其协调发展度.结果表明:1999-2010年期间,辽宁省海洋经济、社会综合发展水平逐年递增,而资源环境综合发展水平值波动较大;1999-2003年,辽宁省海洋经济系统协调性处于失调状态,2004年之后大体处于协调发展状态,且协调等级逐步提升.     

基于元素Mn、Co、Cd、Mo的海相沉积岩有机质 富集因素判别指标在四川盆地北缘的应用

基于金属元素Mn、Co、Cd、Mo的海洋富有机质沉积岩沉积环境和有机质富集主控因素判别指标Al—Co·Mn和Co·Mn—Cd/Mo,能够有效地区分促进有机碳埋藏的两种海洋端元沉积环境:大陆边缘开放/上升洋流环境和滞留的边缘海盆环境。利用这种方法研究了四川盆地北缘城口县月亮坪剖面五峰组和龙马溪组页岩沉积时期的水体环境和有机质富集的主控因素。研究表明五峰组Mn、Co富集程度低,Mo富集程度自下而上明显增大;龙马溪组Mn整体亏损,Co富集程度低,Mo富集程度自下而上明显减小。Al—Co·Mn方法的使用发现滞留环境主要出现在五峰组早期和龙马溪组晚期,以及观音桥段附近,而五峰组中晚期和龙马溪组早—中期水体主要处于开放/上升洋流区。剖面[w(Co)/(μg/g)]·[w(Mn)/(%)]值均小于平均页岩值1.615;五峰组Cd/Mo值整体大于正常海水值0.006,全部小于平均页岩值0.308,龙马溪组整体小于正常海水值。Co·Mn—Cd/Mo联合图版的使用发现月亮坪剖面五峰组和龙马溪组有机质富集主要受到保存条件控制,与使用U/Th、V/Cr、P/Ti、Ba/Al与TOC相关性分析得出的结论一致。基于金属元素Mn、Co、Cd、Mo的判别指标对于判断古生代大陆边缘地区富有机质页岩沉积环境及有机质富集主控因素有较好的效果。