搜索结果: 121-135 共查到“知识库 物理海洋学”相关记录186条 . 查询时间(1.328 秒)
南海渔业资源声学调查与评估
南海 渔业资源 声学调查
2008/10/15
成果采用先进的科学调查船，利用渔业资源研究的声学调查高技术手段，并辅以生物学底拖网和变水层拖网取样方法，取得了南海北部陆架区、中部和南海海域的渔业资源声学影像和声学积分数据以及生物学拖网资料，评估了多种重要经济种类和在生态上具有重要功能的种类的资源存量及其分布，同时对多种传统经济种类资源的历史变动进行了全面、详细的分析研究。指导思想和既定目标明确，工作流程合理，技术方法先进，结论科学性和实用性...
该成果运用摄动法、重正法和远近场匹配法相结合的非线性声传播的研究方法，并与弹性壳体振动理论相耦合，进行球壳和无限长柱壳振动响应与非线性辐射声波的计算分析。通过研究，验证了声波非线性传播的规律，揭示了壳体振动辐射二阶声波的方向特性和频率特性，研究结论与已有的理论和实验结果相吻合。该项成果为新型声发射器的研制和潜艇与水中兵器的噪声分析提供了理论基础与计算方法和程序。
广西近海的物理海洋模型研究
广西 物理海洋模型 近海海洋模型
2008/10/6
该项目采用先进的Casulli半隐式美分格式，建立了一个适用的三维物理海洋模型。模型可对上层海洋流速的垂向分布保持高的分辨率，较好地拟合海底地形，全面反应气候因子的影响。利用所建立的模型，分析了广西沿海的潮流运动规律、环流的变化特征，以及北部湾冷水团存在与广西近海海水输送的关系。其成果达到国内先进水平，可直接应用于海洋环境保护、海岸工程、海洋开发、渔情测报、海洋防灾减灾等，已在多家单位推广使用，并...
A new data acquisition and processing system for profiling sonar
profiling sonar IP network data acquisition parallel processing DSP
2011/9/14
A multi-beam chirp sonar based on IP connections and DSP processing nodes was proposed and designed to provide an expandable system with high-speed processing and mass-storage of real-time signals for...
Direct tension and fracture resistance curves of ultra high performance marine composite materials
ultra high performance cementitious composites fracture resistance curve direct tension
2011/9/14
Fracture behavior is one of the most important, yet still little understood properties of ultra-high performance cementitious composites (UHPCC), a new marine structural engineering material.Research ...
2005年9月南海北部开放航次科学调查物理海洋数据报告
2005年 “实验3号”船 南海北部 物理海洋
2008/9/9
2005年9月“实验3号”船执行南海北部开放航次科学调查物理海洋数据报告。
Comparison of robust H∞ filter and Kalman filter for initial alignment of inertial navigation system
H∞ filter Kalman filter initial alignment integrated navigation system SINS
2011/9/14
There are many filtering methods that can be used for the initial alignment of an integrated inertial navigation system.This paper discussed the use of GPS,but focused on two kinds of filters for the ...
Fatigue crack growth rates of rotor steel at elevated temperatures
rotor steels (30CrlMolV) fatigue crack propagation rate temperature
2011/9/14
Low fatigue samples were obtained from the outer edges of rotor steel (30CrlMolV) which had operated under different temperatures conditions.Based on this data,the effects of temperature on fatigue cr...
Settling larvae of a small coral-reef fish discriminate reef features at large, but not small, spatial scales
a small coral-reef fish discriminate reef spatial scales
2014/4/21
Larval settlement of a small coral-reef fish, the bridled goby (Coryphopterus glaucofraenum), to five entire reefs
over 4 yr decreased with increasing cover of hard substrate (rock and coral). Experi...
Tidal marshes as a source of optically and chemically distinctive colored dissolved organic matter in the Chesapeake Bay
Tidal marshes optically chemically distinctive colored dissolved organic matter the Chesapeake Bay
2014/4/21
The role of tidal marshes as a source of dissolved organic carbon (DOC) and colored dissolved organic matter (CDOM) for adjacent estuarine waters was studied in the Rhode River subestuary of the Chesa...
Seasonal variability of the dynamics of dimethylated sulfur compounds in a coastal northwest Mediterranean site
the dynamics dimethylated sulfur compounds northwest Mediterranean site
2014/4/21
We studied the seasonal variation of biotic and abiotic processes and the physico-chemical forcing factors involved in the production and consumption of dimethylsulfide (DMS) and its precursor dimethy...
Internal wave effects on photosynthesis: Experiments, theory, and modeling
wave effects photosynthesis Experiments theory modeling
2014/4/21
Using field experiments and mathematical models, we tested whether internal waves enhance photosynthesis as they move phytoplankton through a nonlinear light field in situations where photosynthesis i...
Wind-shear-generated high-frequency internal waves as precursors to mixing in a stratified lake
Wind-shear-generated high-frequency internal waves precursors mixing a stratified lake
2014/4/21
Field data were used to estimate the wavelength, phase speed, direction of propagation, frequency, and the vertical structure of high-frequency internal waves observed on the crests of basin-scale wav...
Could stratospheric ozone depletion lead to enhanced aquatic primary production in the polar regions?
stratospheric ozone depletion enhanced aquatic primary production the polar regions
2014/4/21
We study the effects of ozone depletion on primary production in ice-covered and open polar waters using a spectral radiative transfer model combined with a parameterization of the inhibition of marin...
Acclimation to elevated carbon dioxide and ultraviolet radiation in the diatom Thalassiosira pseudonana: Effects on growth, photosynthesis, and spectral sensitivity of photoinhibition
Acclimation to elevated carbon dioxide ultraviolet radiation the diatom Thalassiosira pseudonana on growth photosynthesis spectral sensitivity photoinhibition
2014/4/21
We studied the effects of elevated CO2 concentrations (0.03%vs. 0.1%) on light absorption, membrane permeability, growth, and carbon fixation under photosynthetically active radiation (PAR) and ultrav...