沉降监测多项式回归分析与神经网络预测     

田丰  文鸿雁  张静 《海洋测绘》2007,27(4):23-27

使用多项式和切比雪夫(Tchebyshev)多项式分别对沉降监测数据进行回归分析以预测未来沉降值,其中切比雪夫多项式的外推效果较好;应用前向BP神经网络对两种不同的单因子输入模式进行非线性函数逼近,并进行了不同采样步长的比较,实例表明将时间点作为网络的输入对沉降进行预测效果较好。  相似文献   

基于EMD与神经网络的机械故障诊断技术   总被引：2，自引：0，他引：2  

赵犁丰  周晨赓  仲京臣 《中国海洋大学学报(自然科学版)》2004,34(2):297-302

经验模式分解 (EMD)是分析非线性、非平稳信号的有力工具 ,它将信号分解为突出了原信号的不同时间尺度的局部特征信息的内在模函数 (IMF)分量。本文通过将各 IMF分量输入到 BP网络中进行训练学习和故障诊断 ,比直接输入原信号可以提高 BP网络对故障诊断的准确率 ,而且减少了训练时间。  相似文献   

CHIMEHERB人工皮使用的体会     

任永安  陈长安  刘英娥  陶谏 《中国海洋大学学报(自然科学版)》1989,(Z3)

从1989年4月～1990年10月,我科在69例病人中使用CHIMEHERB人工皮,覆盖治疗了供皮区,Ⅱ°烧伤创面、脱痂创面的残余肉芽创面.临床应用表明:CHIMEHERB人工皮能加快创面的愈合,是目前较好的一种创面覆盖物,用人工皮覆盖创面2～3天后,人工皮干燥,不需再换药,可减轻病人的痛苦.  相似文献   

Comparing the Benguela and Humboldt marine upwelling ecosystems with indicators derived from inter-calibrated models   总被引：10，自引：0，他引：10  

Moloney  Coleen L.; Jarre  Astrid; Arancibia  Hugo; Bozec  Yves-Marie; Neira  Sergio; Roux  Jean-Paul; Shannon  Lynne J. 《ICES Journal of Marine Science》2005,62(3):493-502

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Response-based method for determining the extreme behaviour of floating offshore platforms     

Said Mazaheri  Martine J. Downie 《Ocean Engineering》2005,32(3-4):363-393

The accurate prediction of extreme excursion and mooring force of floating offshore structures due to multi-variete environmental conditions which requires the joint probability analysis of environmental conditions for the worst case situation is still impractical as the processing of large amount of met-ocean data is required. On the other hand, the simplified multiple design criteria (e.g. the N-year wave with associated winds and currents) recommended by API known as traditional method does lead neither to the N-year platform response nor to the N-year mooring force. Therefore, in order to reduce the level of conservatism as well as uncertainties involved in the traditional method the response-based method can be used as a reliable alternative approach. In this paper this method is described. In order to perform the calculations faster using large databases of sea states, Artificial Neural Networks (ANN) is designed and employed. In the paper the response-based method is applied to a 200,000 tdw FPSO and the results are discussed.  相似文献   

Contribution of artificial reefs to the diet of the white sea bream (Diplodus sargus)   总被引：1，自引：0，他引：1  

Leitao  Francisco; Santos  Miguel N.; Monteiro  Carlos C. 《ICES Journal of Marine Science》2007,64(3):473-478

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人工神经网络方法反演东中国海悬移质浓度     

李伟 《海洋湖沼通报》2007,(4):55-58

海中悬移质是决定海洋光学性质、海洋水质,河口海岸带演变动力过程的重要环境参数。本文利用模拟遥感反射比数据集建立人工神经网络反演悬移质浓度,并利用东中国海现场同步数据对该算法进行验证。  相似文献   

On the Polyps of the Common Jellyfish Aurelia aurita in Kagoshima Bay   总被引：1，自引：0，他引：1  

Hiroshi Miyake  Makoto Terazaki  Yoshiko Kakinuma 《Journal of Oceanography》2002,58(3):451-459

There is the natural habitat of polyps of the common jellyfish Aurelia aurita in the Taniyama area, Kagoshima Bay. We examined the attachment substrata, density, colony structure and strobilation of the polyps. The polyps were observed only on the horizontal undersurface of floating piers. They attached specifically to Mytilus shells, solitary ascidians, calcareous polychaete tubes, muddy amphipod tubes and the gap space that fouling animals peeled off the substrata. The polyp colonies were distributed in patches. Spatial distribution patterns of the polyps within their colonies were uniform. Strobilation occurred during late December to March, when water temperatures were 16–17°C, and a large number of ephyrae were released. An increase in man-made structures such as floating piers in coastal areas may lead to bloomings of Aurelia aurita medusae. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

虾夷扇贝人工诱导雌核发育精子遗传失活及紫外线照射对精子形态结构影响的研究   总被引：4，自引：1，他引：4  

潘英  李琪  于瑞海  王如才  郑志芳 《中国海洋大学学报(自然科学版)》2004,34(6):949-954

在1698μWcm-2s^-1的紫外线照射强度下，虾夷扇贝雌核单倍体的最佳诱导时间为60s。从早期胚胎存活率可以观察到Hertwig效应的存在。随着照射时间增加，受精率明显下降，而受精卵在到达D形幼虫期之前便停止发育。扫描电镜显示，随着紫外线照射强度的增加。精子顶体和鞭毛结构趋向于受到更大程度的破坏，直到完全失去顶体和鞭毛。并指出这可能是造成受精率降低的主要原因。  相似文献   

油田高含水期基于微观渗流机理的宏观岩心水驱油数值模拟研究     

谷建伟  翟世奎  李怀明  薛发玉 《中国海洋大学学报(自然科学版)》2006,36(4):540-544

建立地层孔隙网络模型描述微观孔喉特征,利用逾渗方法计算基于微观渗流机理的相对渗透率曲线,并将之应用到数值模拟计算中,给出考虑微观渗流特征的方程,并进行数值求解,得到地层中流体分布特征。实例分析表明该方法可以得到基于微观特征的剩余油分布数量和形式,为调剖堵水、化学驱提供技术参数,实现微观渗流机理与宏观计算的结合。  相似文献