盐湖相低熟油脂肪酸的组成与分布特征   总被引：7，自引：4，他引：3  

张松林  崔明中  李振西  王有孝  范璞 《沉积学报》1999,17(1):130-155

对泌阳凹陷碱性盐湖相、舞阳凹陷盐湖相、襄城凹陷膏盐湖相、南阳凹陷淡水湖相低熟油脂肪酸组成和分布特征进行了分析与研究。结果表明这些不同盐湖相的低熟原油的脂肪酸为丰度不同的饱和正构酸、不饱和正构酸、少量异构酸、类异戊二烯酸及脂肪酸乙酯系列化合物。脂肪酸的组成和分布反映了原始有机质的来源。  相似文献   

遗传算法在非线性地下水经济管理模型中的应用     

邵景力  魏加华  崔亚莉  文唐章 《吉林大学学报(地球科学版)》1999,29(3):259-262

通常采用基于梯度的数学规划方法求解地下水管理模型,如线性规划和非线性规划。但对于高度非线性、非凸的优化问题,尤其是涉及到经济或环境的地下水管理模型,传统方法难以有效地寻找全局最优解。本文介绍了一种求解非线性地下水资源管理模型的遗传算法,并以山东羊庄盆地分布参数地下水系统非线性管理模型为例,给出了用遗传算法在求解这类问题的一般步骤。结果表明该方法能快速有效地找到全局最优解。  相似文献   

“数字地球”科学工程   总被引：10，自引：0，他引：10  

崔伟宏  李小娟 《地球信息科学学报》1999,1(1):36-41

“数字地球”是集科学、技术和工程于一体的一项宏伟的科学体系。“数字地球”由基础研究、技术支撑和科学工程三部分组成,其中科学工程是“数字地球”的核心和目标。文章在我国“数字地球”科学工程现状分析的基础上,结合国情,对我国“数字地球”科学工程的发展提出了建议。  相似文献   

地震信息融媒体公共服务研究     

崔满丰  翟颖  李卫东 《震灾防御技术》2020,15(3):609-617

地震信息传播已进入实时、全面、多维的公共服务时代，单一媒体地震信息服务已无法满足政府、社会公众和地震行业需求，地震信息向融媒体公共服务模式发展。本文对地震信息内容服务需求及特点、地震媒体平台功能特色、融合式媒体信息服务模式等进行分析，对地震信息融媒体公共服务进行研究，旨在提高地震信息服务效率与用户满意度，促进地震信息化建设科学、健康发展。  相似文献   

GIS-based hazard mapping and zonation of debris flows in Xiaojiang Basin,southwestern China   总被引：11，自引：0，他引：11  

Y.?P.?HeEmail author  H.?Xie  P.?Cui  F.?Q.?Wei  D.?L.?Zhong  J.?S.?Gardner 《Environmental Geology》2003,45(2):286-293

Debris flow sites were identified at 140 locations in the Xiaojiang Basin in Yunnan province, southwestern China. Their spatial distribution and catchment characteristics are described in detail on the basis of previous research, air photo interpretation, field investigation and mapping using Geographical Information Systems (GIS). Using a statistical approach, a quantitative model of hazards assessment and zonation was developed through synthesis analysis of basin areas, gradients, and the relative reliefs of these debris flow sites. In terms of debris flow hazard assessment, areas within the Xiaojiang Basin can be classified as severe, heavy and light hazard regions.  相似文献   

On the Disappearance of Kilohertz Quasi-periodic Oscillations at a High Mass Accretion Rate in Low-Mass X-Ray Binaries     

Cui W 《The Astrophysical journal》2000,536(1):L31-L34

We here investigate the possibility that the ultra-high-energy cosmic-ray (UHECR) events observed above the Greisen-Zatsepin-Kuzmin (GZK) limit are mostly protons accelerated in reconnection sites just above the magnetosphere of newborn millisecond pulsars that are originated by accretion-induced collapse (AIC). We formulate the requirements for the acceleration mechanism and show that AIC pulsars with surface magnetic fields 1012 G/=10(20) eV. Because the expected rate of AIC sources in our Galaxy is very small ( approximately 10(-5) yr(-1)), the corresponding contribution to the flux of UHECRs is negligible and the total flux is given by the integrated contribution from AIC sources produced by the distribution of galaxies located within the distance that is unaffected by the GZK cutoff ( approximately 50 Mpc). We find that reconnection should convert a fraction xi greater, similar0.1 of magnetic energy into UHECRs in order to reproduce the observed flux.  相似文献