赤潮藻类生态营养模型非线性动力研究   总被引：1，自引：1，他引：0  

王洪礼  葛根  李怀宇 《海洋技术学报》2005,24(4):41-43

基于营养盐、赤潮藻类、植食浮游动物之间的食物链关系,考虑到由于海洋内微生物分解动植物遗体对营养盐的补充以及物理因素导致的流失,文中建立了营养盐一赤潮藻类一植食性浮游动物相互作用的耦合生态动力学模型。运用现代非线性动力学理论,对模型解的动力学稳定性进行了分析。结果表明,随着参数的变化,系统稳定性也随之变化,甚至出现HOPF分岔现象。  相似文献   

无粘性土中桩基水平非线性地基反力系数研究          下载免费PDF全文

孙永鑫  朱斌  陈仁朋  杨永垚  熊根 《海洋工程》2014,32(2):38-45

非线性地基反力系数法是分析近海桩基水平大变形性状的有效途径。针对我国近海广泛分布的粉土和砂土地基,建立了无粘性土中桩基非线性地基反力系数与桩基径向土压力之间的关系,据此基于物理模型试验和现场试验结果获得了粉土和砂土地基反力系数与桩径和桩身变位之间的非线性关系,为桩基水平受力大变形分析提供了简单有效的方法,适用于不同直径桩基的计算,得到了桩基物理模型试验和现场试验结果的验证。  相似文献   

基于高光谱大气红外探测器模拟亮温的稳健变分反演研究     

王根  吴玲玲  李南 《气象与环境科学》2014,37(3):21-26

经典变分反演法是基于观测误差服从高斯分布的假定,对偏离均值较大的离群值较敏感。当实际观测数据包含离群值观测误差呈现非高斯分布时,如果采用经典反演法进行变分反演就会产生大的偏差,甚至导致变分反演的失败。使用经典变分反演法首先需要进行质量控制,剔除所谓的离群值,但有相当部分的离群值包含了一些亮点,如天气现象。如果对其“视而不见”,则对很多重要的信息就无法把握。基于此,研究采用稳健变分反演的思想同化这些离群值,主要思想是把M-估计法（L2、Huber、Fair和Cauchy一估计）的权重函数耦合到经典变分反演中,在每次变分反演极小化迭代过程中重新估计观测项对经典变分反演目标泛函的贡献率。采用高光谱大气红外探测器（AtmosphericInfraRedSounder,AIRS）的通道模拟亮温进行理想试验,结果表明：采用Huber一估计进行稳健变分反演对温度和湿度反演具有较好的效果;采用Cauchy-估计得到的效果反而更差,这是由Cauchy等分布函数固有的缺陷所决定的。因此,稳健变分反演观测误差非高斯分布是可行的,但依赖M-估计法权重函数的选取。  相似文献   

重庆市公共租赁住房申请审核管理信息平台设计与实现     

赵根  颜英 《国土资源信息化》2011,(6):47-50

为解决中低收入和新就业人员的住房问题,从2010年开始,重庆市在全国率先大规模进行了公共租赁住房的建设。本文从如何通过公共租赁住房申请审核管理信息系统的建设,支撑公共租赁住房的申请审核、摇号配租工作,并重点就如何利用整合的市级部门信息资源,审核申请人的申请资格,从而确保公共租赁住房能得到公平、公开、公正的分配进行了介绍。  相似文献   

关于国土资源“一张图”建设的思考     

屈晓波  赵根 《国土资源信息化》2013,(4):12-15

国土资源＂一张图＂建设作为国土资源信息＂十二五＂的重要工作,目前正在全国各级国土资源管理部门中如火如荼的开展,但对于国土资源＂一张图＂的定义和建设方法,全国并无统一的界定和设计,本文在对目前全国各地国土资源＂一张图＂建设进行综合分析的基础上,提出了作者自己关于国土资源＂一张图＂建设的思考。  相似文献   

重庆市国土房管行业数据中心建设     

赵根  魏鑫  洪永文 《国土资源信息化》2013,(4):20-23

本文介绍了在大集中管理模式下的重庆市国土资源和房屋管理行业数据中心建设,分别就网络系统、主机系统、数据库系统、存储系统、安全建设和日常运行监控进行了介绍,重点对主机虚拟化、应用虚拟化、数据库镜像同步等技术在重庆市国土房管行业数据中心的应用进行了介绍。  相似文献   

The Çubukludağ graben,south of İzmir: its tectonic significance in the Neogene geological evolution of the western Anatolia     

Can Ş. Genç  Şafak Altunkaynak  Zekiye Karacık  Metin Yazman  Yücel Yılmaz 《Geodinamica Acta》2013,26(1-3):45-55

Abstract

Field studies on the Neogene successions in south of ?zmir reveal that subsequent Neogene continental basins were developed in the region. Initially a vast lake basin was formed during the early-Middle Miocene period. The lacustrine sediments underwent an approximately N-S shortening deformation to the end of Middle Miocene. A small portion of the basin fill was later trapped within the N-S-trending, fault-bounded graben basin, the Çubukluda? graben, opened during the Late Miocene. Oblique-slip normal faults with minor sinistral displacement are formed possibly under N–S extensional regime, and controlled the sediment deposition. Following this the region suffered a phase of denudation which produced a regionwide erosional surface suggesting that the extension interrupted to the end of Late Miocene–Early Pliocene period. After this event the E–W-trending major grabens and horsts of western Anatolia began to form. The graben bounding faults cut across the Upper Miocene–Pliocene lacustrine sediments and fragmented the erosional surface. The Çubukluda? graben began to work as a cross garden between the E–W grabens, since that period. © 2001 Éditions scientifiques et médicales Elsevier SAS  相似文献   

安徽巢湖凤凰山石炭系黄龙组红色灰岩矿物地球化学特征          下载免费PDF全文

李根  刘鑫  赵梦琦 《高校地质学报》2014,20(4):528

安徽巢湖凤凰山晚石炭世黄龙组的地层主体为肉红色生物屑微晶灰岩,顶部为夹灰岩条带的泥岩。矿物学分析显 示,肉红色生物屑微晶灰岩的矿物主要为方解石,含少量针铁矿和赤铁矿。漫反射光谱分析表明,常用的古气候指标“红 度”与灰岩中铁氧化物、氢氧化物的光谱强度具显著的正相关性,而与岩石的全铁含量相关性较低,据此推测铁的氧化物 和氢氧化物是灰岩呈肉红色的重要原因。元素地球化学分析结果显示,黄龙组灰岩相对富Fe,Mn,而贫Co,Ni,在 Al-Fe-Mn,Fe-Mn-(Cu+Co+Ni)以及Cu-Pb-Zn三角判别图上,均靠近或落入热液成因区。综合地球化学特征与前人研究成 果,该文认为巢湖凤凰山黄龙组肉红色灰岩的形成很可能受到海底热液活动的影响。  相似文献   

Evidence for strengthening of the tropical Pacific Ocean surface wind speed during 1979–2001     

Gen Li  Baohua Ren 《Theoretical and Applied Climatology》2012,107(1-2):59-72

Using multiple surface wind speed (SWS) data sets and trend empirical orthogonal function analysis, we have explored the trend in SWS associated with the large-scale tropical Pacific atmospheric circulation for the period 1979–2001. The present research provides a robust evidence of strengthening of the tropical Pacific Ocean SWS during this period and the magnitude is generally in line with the finding of Wentz et al. The strengthening in SWS is closely associated with the so-called La Ni?a-like sea surface temperature (SST) trend pattern rather than the changes in the ENSO, ENSO Modoki, or PDO. The present results, together with those from some recent climate model simulations, suggest that global warming forcing may have caused an intensification of SWS in the tropical Pacific Ocean by inducing the La Ni?a-like SST trend pattern due to ocean dynamics. Meanwhile, the strengthening in the tropical Pacific Ocean surface trade winds may also feedback to enhance the La Ni?a-like SST trend pattern under the positive wind-upwelling dynamic feedback mechanism.  相似文献   

Imaging-Based Characterization of Perthite in the Upper Triassic Yanchang Formation Tight Sandstone of the Ordos Basin,China     

DU Shuheng  SHI Guoxin  YUE Xinjian  KOU Gen  ZHOU Bo  SHI Yongmin 《《地质学报》英文版》2019,93(2):373-385

This work investigated the element distribution of perthite from the Upper Triassic Yanchang Formation tight sandstone in the Ordos Basin of northern China by field emission scanning electron microscopy(FE-SEM) and energy dispersive spectrometer(EDS). FE-SEM results indicate significant differences in the morphology of Na-rich feldspar when K-rich feldspar is the main component of the perthite. EDS results show that different types of perthite have clearly defined differences on different element indexes. Additionally, indexes such as average-weight-K(K-rich)/Na(Na-rich), maximumweight-K(Na-rich)/Na(Na-rich) and average-atomic-K(K-rich)/Na(Na-rich) might be the most effective ones to identify perthite types. Perthite is divided into six main types, i.e., perthite with thick parallel stripe distribution, with thin parallel stripe distribution, with lumpy stripe distribution, with dendritic stripe distribution, with encircling stripe distribution, and with mixed stripe distribution.  相似文献