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��ΰ  ������  ��ǿ 《大地测量与地球动力学》2014,34(5):134-138

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王学滨  顾路  马冰  吕家庆 《大地测量与地球动力学》2014,34(2):45-50

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王学滨  马冰  吕家庆  顾路 《大地测量与地球动力学》2014,34(1):63-67

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田英国  郝金明  刘伟平  于合理  王鸿  杨剑伟 《大地测量与地球动力学》2014,34(1):157-160

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GPU accelerated marine data visualization method   总被引：1，自引：0，他引：1  

Bo Li  Ge Chen  Fenglin Tian  Baomin Shao  Pengbo Ji 《中国海洋大学学报(英文版)》2014,13(6):964-970

The study of marine data visualization is of great value. Marine data, due to its large scale, random variation and multiresolution in nature, are hard to be visualized and analyzed. Nowadays, constructing an ocean model and visualizing model results have become some of the most important research topics of ‘Digital Ocean'. In this paper, a spherical ray casting method is developed to improve the traditional ray-casting algorithm and to make efficient use of GPUs. Aiming at the ocean current data, a 3D view-dependent line integral convolution method is used, in which the spatial frequency is adapted according to the distance from a camera. The study is based on a 3D virtual reality and visualization engine, namely the VV-Ocean. Some interactive operations are also provided to highlight the interesting structures and the characteristics of volumetric data. Finally, the marine data gathered in the East China Sea are displayed and analyzed. The results show that the method meets the requirements of real-time and interactive rendering.  相似文献   

Phylogenetic analysis of epibacterial communities on the surfaces of four red macroalgae   总被引：1，自引：0，他引：1  

Hongqing Wu  Min Liu  Wuchang Zhang  Tian Xiao 《中国海洋大学学报(英文版)》2014,13(6):1025-1032

Macroalgal surfaces are prone to being attached by bacteria. Epibacterial community structures on marine macroalgae are host-specific but temporally and spatially variable. In this study, we investigated the structure of epibacterial communities on the surfaces of four red macroalgae, Gracilaria lemaneiformis, Gloiopeltis furcata, Mazzaella sp. and Porphyra yezoensis, by analyzing the sequences of 16 S r RNA gene libraries. Healthy individuals of all macroalgae species were collected in winter from a farm at Dalian, China. The results showed that the epibacterial communities were mainly dominated by α-Proteobacteria, γ-Proteobacteria and Bacteroidetes. Deinococcus-Thermus, Spirochaetes and ε-Proteobacteria were also found. The majority of cloned sequences shared the greatest similarity to those of culturable organisms. A large portion of sequences from the α-Proteobacteria homed in Roseobacter clade, i.e., genera Ahrensia, Roseovarius, Litoreibacter, Octadecabacter, Thaiassobacter and Sulfitobacter, while members of Bacteroidetes mainly belonged to family Flavobacteriaceae. The cloned sequences could be separated into 66 OTUs at 0.01 distance value, and rare common OTUs were found among libraries. At genus level, Pseudoalteromonas dominated Gr. lemaneiformis and Gl. furcata libraries, accounting for 72.2% and 47.3%, respectively. Sulfitobacter dominated P. yezoensis library, accounting for 35.4%. A previously undefined cluster within Deinococcus-Thermus dominated Mazzaella sp. library, accounting for 24.6% of the all. These results indicated that a broad range of bacteria inhabited the surfaces of these macroalgae.  相似文献   

基于空间综合分析的长株潭城市群结构评价与优化策略     

潘悦  韩瑞  庞添  冯婷 《地理信息世界》2022,29(1):17-22

长株潭城市群空间特征及优化策略可作为我国多中心城市群空间优化的典型样本之一.本文运用多维度空间分析方法,对长株潭城市群空间展开现状测度与评价,尊重城市群阶段特征,选取针对性指标对比反映空间内在特征.在采用核密度法分析2013年和2017年湖南省152个区县第二产业与就业指标的空间变化后,得出长株潭城市群已初步形成空间—...  相似文献   

百色双套自动气象站雷击故障维修的方法     

黄健征  田小芳 《气象研究与应用》2014,(1):97-98

通过对百色双套自动气象站遇到历史罕见的强雷暴袭击出现故障维修,摸索出了检修双套新型自动站的通信、电源供应、主机HY3000、接口RS232、分采仪器等模块的方法,供同行借鉴.  相似文献   

EMD方法在广西夏季降水量预测中的应用     

马军  陆甲  赵金彪 《气象研究与应用》2014,35(3):31-35

对广西夏季降水量进行EMD分解后,利用均生函数相关法,比较不同IMF分量组合建模的预测,不同组合试验预测显示,用前二个IMF分量组合建模预测是最佳的组合方案。经对2001—2010年共10年广西夏季降水量实际预测检验表明,趋势预测准确率达70%以上,对夏季降水量预测较有参考价值。为基层台站的气候预测及服务提供一个客观预测方法。  相似文献   

海山区浮游生态学研究   总被引：10，自引：7，他引：3  

张武昌  于莹  李超伦  李学刚  肖天 《海洋与湖沼》2014,45(5):973-978

本文综述了海山浮游生态学研究的现状。海山是大洋中常见的地形单元,在有的海山附近鱼类和底栖生物的生物量比周围大洋中要多,针对这些鱼类和底栖生物的饵料来源提出了三种假说,第一种假说认为海山区特殊的物理环境导致初级生产力较高(经典假说),第二种假说认为海山区的饵料不是本地生产的,地形和流场使得外来的浮游生物在海山区富集或通量加大(外来营养补充假说),第三种假说认为海山上部的颗粒有机物营养较高,是鱼类和底栖生物的营养来源之一(颗粒有机物补充假说)。对海山浮游生态学的研究基本围绕这几个假说进行。目前只在9座海山进行了浮游生态学研究,这些研究表明单个假说并不能解释海山附近鱼类生物量较大的现象,海山鱼类和底栖生物的营养来源可能有很多,这些假说阐述的机制并不互相矛盾,海山生物之间的营养关系也比原来想象的复杂得多。已有研究都是针对其中某个假说进行验证研究,建议我国即将进行的海山浮游生态学研究针对三种假说进行海上调查,以提供完备的数据支持。  相似文献