搜索结果: 151-165 共查到“知识库 海洋调查与监测”相关记录466条 . 查询时间(4.812 秒)
Brief communication "What do we know about freaque waves in the ocean and lakes and how do we know it?"
Brief communication freaque waves ocean lakes
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2011/1/19
We made an objective examination of our present state of knowledge on freaque waves in the ocean and lakes from three separate perspectives:
Brief communication "What do we know about freaque waves in the ocean and lakes and how do we know it?"
communication freaque waves ocean lakes
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2010/12/29
We made an objective examination of our present state of knowledge on freaque waves in the ocean and lakes from three separate perspectives:
Freak waves of different types in the coastal zone of the Baltic Sea
Freak waves different types the coastal zone the Baltic Sea
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2010/10/21
We present a statistical analysis of freak waves1 measured during the 203 h of observation on sea surface elevation at a location in the coastal zone of the Baltic Sea (2.7 m depth) during June–July 2...
The GITEWS ocean bottom sensor packages
The GITEWS ocean sensor packages
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2010/10/21
The German-Indonesian Tsunami Early Warning System (GITEWS) aims at reducing the risks posed by events such as the 26 December 2004 Indian Ocean tsunami. To minimize the lead time for tsunami alerts, ...
山东沿海海洋监测浮标网的构建
海洋监测 海洋灾害 浮标网
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2012/3/26
针对山东沿海独特的地理位置，构建了浮标监测网，按照远海、近海、近岸三个层次，分布在山东沿海从近岸到60海里的范围内，主要测量气象要素、水文要素以及水质生态等参数。设计的浮标监测网布局合理，能够有效的监测海洋污染、赤潮和水质情况，监视风暴潮和台风的发展和走向趋势。
一维小波的信号处理在海水中总有机碳测量中的应用研究
小波变换 去噪 VC++
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2012/3/26
结合海水中总有机碳测定的信号除噪问题，对基于小波变换的信号除噪基本原理和方法进行了研究。算法由Visual C++编制完成，通过对采集的信号进行分解，去除其中的高频信号，最后再重构回信号，实现了一维小波的信号处理。实验证明，该算法简捷有效，能达到降低干扰的目的。
基于非抽样Contourlet变换的高定位精度认证水印算法
水印 认证 非抽样Contourlet变换 奇异值分解
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2012/3/26
本文提出了一种基于非抽样Contourlet变换的高定位精度图像自适应认证水印算法。对原始图像进行非抽样Contourlet变换，选取低频子图分块后进行奇异值分解，通过自适应量化修改奇异值嵌入经混沌置乱后的二值水印信息。整个分解过程没有任何抽样环节，各尺度下各方向子带均与原始图像具有相同的尺寸，从而提高了篡改定位的精度，增加了水印的嵌入量。水印的提取只需要由混沌初值和量化参数构成的密钥，保证了算法...
基于ARM的海水总有机碳含量现场分析仪的硬件设计
TOC现场分析仪 ARM架构 Windows CE嵌入式操作系统 光电倍增管
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2012/3/26
针对海洋生态调查对海水总有机碳含量(TOC)的要求，研制了一种基于化学发光法检测海水 TOC值的现场分析仪。该仪器硬件基于SOC技术，采用ARM架构S3C2440微处理器，嵌入Windows CE操作系统。经过多次海试测量验证，该分析仪在保证测量精度的前提下，提高了测量速度，具有很好的现场应用性。
樟溪河渔业资源调查及细鳞斜颌人工繁育
资源调查 细鳞斜颌鲴 繁育 放流
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2012/9/27
为恢复和保护樟溪河生态, 对其中的渔业资源进行了调查与分析, 建立了一套保护方案, 并对其中主要的特色鱼类—–细鳞斜颌鲴开展了人工繁育技术研究. 3年来放流鱼苗 350 万尾, 通过放流与保护, 细鳞斜颌鲴恢复了种群优势, 樟溪河生态得到了一定的恢复.
象山港潮间带大型底栖动物次级生产力初探
象山港 大型底栖生物 次级生产力 P /B 值
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2012/9/27
通过2006~2007 年对象山港滩涂潮间带大型底栖动物春、夏、秋、冬的4 次调查, 利用Brey经验公式进行了大型底栖动物栖息丰度、生物量、次级生产力和P / B 值的研究.结果表明:该海域年平均栖息丰度为680.2 ind·m-2;年平均生物量( 以去灰干重计) 为16.82 g·m-2; 年平均次级生产力( 以去灰干重计) 为17.26 g·(m2·a)-1; P /B 值为0.91~...
Hydrologic control of nitrogen removal, storage, and export in a mountainstream
Hydrologic control nitrogen removal storage mountains tream
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2014/4/17
Nutrient cycling and export in streams and rivers should vary with flow regime, yet most studies of stream nutrient transformation do not include hydrologic variability. We used astable isotope tracer...
Mixing and stratification in lakes of varying horizontal length scales: Scaling arguments and energy partitioning
Mixing stratification varying horizontal length scales Scaling arguments energy partitioning
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2014/4/17
This work analyzes the effects that changes in the surface area of stratified lakes have on the partitioning of energy among different pools, and, ultimately, on the strength of thermalstratification....
Turbulent mixing induced by nonlinear internal waves in Mono Lake, California
Turbulent mixing induced nonlinear internal waves Mono Lake California
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2014/4/17
Describing the spatial and temporal occurrence of turbulent mixing and the mechanisms of turbulence production are fundamental problems in physical limnology and oceanography. Here we present results ...
Residual circulation due to internal waves shoaling on a slope
Residual circulation internal waves shoaling a slope
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2014/4/17
We describe the residual circulation induced in a two-layer system when internal waves, with a wave length equal to or longer than the slope length, propagate over a sloping bottom and either reflect ...
Effects of seasonality and resource limitation on organic matter turnover by Chironomidae (Diptera) in southern Appalachian headwater streams
seasonality resource limitation Chironomidae in southern Appalachian headwater streams
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2014/4/17
Despite their high abundance, secondary production, and known reliance on detrital material, the role of chironomids (Diptera) in fine particulate organic matter (FPOM) dynamics has not been well quan...