基于EPAS技术的日照市大气单颗粒物理化学特性及来源研究     

姚维杰  谢付莹  王大玮  田雨  刘航  刘晓咏  张宇婷  雷山东  孙业乐  吴林  潘小乐  王自发 《气候与环境研究》2021,26(6):608-620

城市地区大气气溶胶颗粒的物理化学特性复杂,理清单颗粒精细的化学成分和混合状态对于大气污染溯源和精细治理具有重要意义。本研究利用被动式气溶胶采样器分别在山东省日照市城区和钢铁园区两个区域进行了定点采样,并利用智能扫描电镜环境颗粒物分析系统（IntelliSEM EPAS）对采集的大气单颗粒物样品进行分析。结果表明,日照市大气颗粒物主要由不规则碳质颗粒（C-rich）、含硫颗粒（Ca-S、Na-S-Ca）与矿物颗粒组成。其中,城区样品中C-rich颗粒数量贡献为53.5%,是钢铁园区样品的2.5倍,大于1 μm的颗粒物数量为9.0%,是钢铁园区样品的1.7倍,城区居民活动和工业过程是城市中大气颗粒物特别是二次细颗粒的主要来源。钢铁园区样品中含硫颗粒物数量贡献为72.9%,含硫颗粒物质量贡献为30.9%,富铁颗粒物质量贡献为5.3%,分别是城区样品的1.8倍、3.6倍和2.9倍,表明钢铁园区大气颗粒物的主要来源包括钢铁企业排放的一次污染物及其转化生成的二次细颗粒物。  相似文献   

基于多密度聚类算法的路网提取     

朱鸿博  王山东  李贺  方琪  征程 《地理信息世界》2017,24(3)

随着GPS等定位系统的迅速发展,使得路网提取有了新的发展方向,然而目前利用浮动车GPS轨迹数据提取路网的方法层出不穷,但是提取效果却并不能尽如人意。本文将基于网格密度因子的多密度聚类算法引入路网提取,通过该方法对疑似特征点进行聚类来提取道路特征点,来构建道路几何网络,并通过对比分析取得了不错的实验结果。  相似文献   

地震与核爆识别的小波包分量比方法   总被引：25，自引：5，他引：20       下载免费PDF全文

杨选辉  沈萍  刘希强  郑治真 《地球物理学报》2005,48(1):148-156

频谱分析法在核爆与地震识别中具有广泛的应用．但是频谱分析方法是稳态方法,即使采用Gabor变换,也因时-频窗口形状不变而分辨串较低．为提高时-频分辨率,本文将小波变换理论用于乌鲁木齐台记录的地震与核爆事件的分析,并提出了识别核爆和天然地震的小波包分量比判据．通过对加拿大黄刀地震台记录的印度地下核爆的分析,进一步验证了小波包分量比判据对核爆和地震的识别具有较高的识别效率．结果表明：对于地震信号,其小波包分量比U03/U1一般都大于1.0,而对于核爆信号,比值U03／U13一般都小于1.0.  相似文献   

大同—阳高Ms6.1地震前兆综合加权信息熵的变化     

张昭栋  刘章增  赵会蓬 《大地测量与地球动力学》2002,22(1):51-55

利用“地震预报计算机专家系统”的思想对大同 -阳高 Ms6 .1地震前每一前兆异常事件进行综合评估 ,以每一异常的最可能发震时间来计算发震概率 ,利用地震前兆综合加权信息熵研究了系统熵值与地震的关系。对华北地区的地震前兆综合加权信息熵研究表明 ,在大同 -阳高 Ms6 .1地震前 ,信息熵出现了明显的减熵有序变化  相似文献   

Comparative Analysis of Seismic Response Characteristics of Pile-Soil-Stnicture Interaction System     

KONG Desen  LUAN Maotian  and WANG Weiming School of Civil Engineering  Harbin Institute of Technology  Harbin  P.R.China School of Civil  Architectural Engineering  Shandong University of Science  Technology  Qingdao  P.R.China Institute of Geotechnical Engineering  Dalian University of Technology  Dalian  P.R.China 《中国海洋大学学报(英文版)》2006,(1)

The study on the earthquake-resistant performance of a pile-soil-structure interaction system is a relatively complicated and primarily important issue in civil engineering practice. In this paper, a computational model and computation procedures for pile-supported structures, which can duly consider the pile-soil interaction effect, are established by the finite element method. Numerical implementation is made in the time domain. A simplified approximation for the seismic response analysis of pile-soil-structure systems is briefly presented. Then a comparative study is performed for an engineering example with numerical results computed respectively by the finite element method and the simplified method. Through comparative analysis, it is shown that the results obtained by the simplified method well agree with those achieved by the finite element method. The numerical results and findings will offer instructive guidelines for earthquake-resistant analysis and design of pile-supported structures.  相似文献   

Distribution Patterns of Pentacyclic TriterpenoidHydrocarbons in Low-Mature Source Rocksfrom Eastern China     

HOU Dujie  ZHANG Linye  WANG Tieguan Research Centre for Organic Geochemistry  Jianghan Petroleum Institute  Jingzhou  Hubei Applied Geochemistry Section  Dept. ofGeosciences  China University of Petroleum  Changping  Beijing Geochemistry Research Section  Shengli Petroleum Geological Sciences Institute  Shengli Petroleum Administration Bureau  Dongying  Shandong 《《地质学报》英文版》1998,72(4):399-408

Four typical distribution patterns of pentacyclic triterpenoid hydrocarbons (types A-D) are distinguished in the low-mature source rocks from eastern China. Type A has a relatively high content of pentacyclic triterpenes. It exists in immature sediments and the distribution and abundance of triterpenes vary with the maturity of the sediments. An unknown C30 triterpene (UCT2) has also been detected in very shallow sediments. This compound is very unstable and disappears rapidly with the increase of depth. Type B is characterized by a relatively high amount of 17α(H), 21β(H)-30-homohopane. This kind of distribution pattern is common in coals and terrestrial sediments of low maturity. Type C has a relatively high content of diahopane and neohopane series. The analysis shows that this distribution pattern may have an indirect relationship with the input of higher plants despite its microbial source. There are C30-unconfirmed triterpane (UCT2) and a relatively high content of C35 hopane in type D. The dist  相似文献   

Mechanism and Modes of Microbial Minerogenesis of Polymetallic Nodules on the Ocean Floor   总被引：2，自引：0，他引：2  

YAN Baorui ZHANG Xigen  LIANG Dehu  XU Dongyu  LIU Yifen  ZHANG Wei Institute of Hydro geology  Engineering Geology  MGMR  Shigang Street  Shijiazhuang  Hebei Guangzhou Marine Geological Survey  MGMR  Guangzhou Institute of Marine Geology  MGMR  P. O. Box  Qingdao  Shandong 《《地质学报》英文版》1998,72(3):282-290

This paper presents a quantitative analysis of the relations of the occurrence of polymetallic nodules with the geochemical actions of microbes in the seawater, pore water and sediments at the bottom of the eastern Pacific Ocean basin. Emphasis is laid on the relations of the activity intensity and biochemical transformation rate of aerobic bacteria (iron bacteria, Thiobacillus thioparus, halobacteria and manganese-oxidizing bacteria) and anaerobic bacteria (sulphate-reducing bacteria, denitrifying bacteria, Thiobacillus denitrificans) with mineralization. The experimental research on the migration and accumulation of ore-forming elements caused by microbial and chemical actions shows that the microbes have changed the conditions of oxidation and reduction in the system, and their effect on the element precipitation is much stronger than the chemical actions and accelerates the enrichment of Fe and Mn. It demonstrates that the microbes can change the environment to promote the accumulation of ore-formin  相似文献   

沂沭断裂带垂直形变与断层活动特征分析   总被引：8，自引：8，他引：0  

李杰  韩海华  闫德桥  刘敏 《大地测量与地球动力学》2002,22(2):106-111

利用跨断层短水准资料分析了沂沭断裂带断层活动特征，结果表明：NNE向的沂沭断裂带与NW向断裂活动性质有所不同，沂沭断裂带主要为压性逆断活动，北西向断裂带为张性正断活动，与地质考察结果基本一致。此外，沂沭断裂带及北西向断裂带都具有分段活动的特点。  相似文献   

THE ULTRASTRUCTURE OF SEPARATED AND CULTURED CELL OF PORPHYRA YEZOENSIS     

梅俊学  费修绠 《中国海洋湖沼学报》2001,19(1):35-39

There are many reports that cells (protoplasts) separated from the thallus of Porphyra by enzyme can develop to normal leafy thalli in the same way as monopores. But there are few investigations on the subcellular structure of the isolated vegetative cell for ccmparison with the subcellular structure of monospores. To clarify whether the separated and cultured cells undergo the same or similar ultrastructure changes during culture and germination as monospores undergo in their formation and germination, we observed their ultrastructure, ccxnpared them with those of the monospore and found that the ultrastructure of separated and cultured cells did not have the characteristic feature as that of monospore formarion, such as production of small and large fibrous vesicles, but was acccxnpanied by vacuolation andstarch mobilization like that in monospore germination. The paper also discusses the relations between monospores and separated and cultured cells.  相似文献   

一次渤海气旋发生的初步分析     

山东省气象局气象台 《大气科学》1976,(2):70-72

一九七五年五月四日晨开始,在河北省东部、渤海海面、辽东半岛、山东半岛、黄海北部海面先后出现9—10级西北大风。掖县、羊角沟、招远、海阳、蓬莱等地区阵风达12级,并伴有阵性降雨过程。由于风的来势很猛,使沿海部分地区的人民生命财产受到了一定程度的损失。  相似文献