海浪数值模式研究回顾与进展   总被引：1，自引：1，他引：1  

闻斌  刘俊 《海洋预报》2006,23(4):76-81

本文简单介绍了海浪的生成、发展理论,以及海浪数值模式的分类;回顾总结了国内外在海浪数值模式研究方面取得的成果。  相似文献   

PLS-ANN分析血浆自体荧光光谱的二阶导数光谱识别胃癌   总被引：1，自引：0，他引：1  

马君  朱玉平  毛伟征  李颖  史晓凤  郑荣儿  孟继武 《中国海洋大学学报(自然科学版)》2006,36(3):505-508

探讨偏最小二乘法结合神经网络法(简称PLS-ANN)分析血浆自体荧光光谱的二阶导数光谱识别胃癌的优势,对20例胃癌病人和23例健康人血浆进行以405nm为激发光的自体荧光光谱检测,采用PLS-ANN法分别对血浆自体荧光光谱和二阶导数光谱进行判别分析。PLS-ANN分析血浆的自体荧光光谱法诊断胃癌的灵敏度为75%,特异度为83%,准确率为79%,PLS-ANN分析血浆的二阶导数光谱法诊断胃癌的灵敏度为90%,特异度为96%,准确率为93%。结果表明PLS-ANN分析血浆的二阶导数光谱法识别胃癌,优于PLS-ANN分析血浆的自体荧光光谱法,有望成为快速识别胃癌的较理想方法。  相似文献   

MATHEMATICAL MODEL FOR WAVE DIFFRACTION OF GAP BREAKWATER     

龚崇准  戴功虎 《海洋学报(英文版)》1985,4(2):320-331

By combining the singularity distributions method in mathematical-physical equation with the phenomenon of water surface oscillation, two kinds of wave diffraction model of gap breakwater are recommended for preliminary port planning and designing.  相似文献   

银川盆地中更新世以来的孢粉记录及古气候研究   总被引：8，自引：1，他引：8  

杨振京  刘志明  张俊牌  童国榜  阳小兰 《海洋地质与第四纪地质》2001,21(3):43-49

银川盆地中更新世以来的孢粉记录及据此所重建的古气候参数，揭示了该区中更新世以来的古气候演变特征，其演变经过了温湿→凉湿→温和→冷湿→温干→凉较湿→冷湿→温干→凉润→温较干→温干的变化，并与新疆地区，黄土高原以及深海δ^18O曲线进行了对比，结果表明，各地的古环境变化大致同步，该区由于位置靠西，邻近沙漠，最近地质历史时期的区域性干旱特色明显。  相似文献   

黄海海域陆相中生界油气远景   总被引：8，自引：1，他引：8  

李刚  陈建文  肖国林  温珍河  戴春山  龚建明  闫桂京 《海洋地质前沿》2003,19(8):7-11

黄海海域油气勘探已40余载，尚未实现油气突破，其找油前景引起石油地质学家的极大关注。根据前人的认识和最新研究成果，结合邻区油气地化资料，探讨了黄海海域中生界地层生、储、盖特征，特别是白垩系，它分布广，厚度大，烃源岩达到较好生油岩标准，并且生、储、盖组合理想，中生界是该区下部油气勘探首选目标。  相似文献   

Identification of Epinephelus malabaricus and Epinephelus coioides using DNA markers     

WANG Shifeng  DU Jiaying  WANG Jun  DING Shaoxiong 《海洋学报(英文版)》2007,26(1):122-129

1 IntroductionBothEpinephelus malabaricusandE. coioidesbelong to the genusEpinephelus(Perciformes: Ser-ranidae: Epinephelinae).They are warm water reeffishes that have similar distribution ranges as well assimilar morphological characteristics, which have…  相似文献   

山溪性可冲性强潮河口曹娥江高水位初步研究     

潘存鸿  蔡军 《海洋学研究》2001,19(1):11-18

应用多年的实测资料 ,分析了曹娥江河口高水位成因 ,结果表明 ,曹娥江河口洪水位具有山溪性和可冲性的特点 ,人类活动对高水位有较大影响。应用统计分析法和成因分析法推求 1 %设计高水位 ,讨论了成因分析法中上、下边界条件的选取 ,其选取原则对其他潮汐河口确定设计高水位具有借鉴意义  相似文献   

On dynamic coupling effects between a spar and its mooring lines     

Xiaohong Chen  Jun Zhang  Wei Ma 《Ocean Engineering》2001,28(7):79

The responses of a spar constrained by slack mooring lines to steep ocean waves and tensions in the mooring lines are simulated using two different numerical schemes: a quasi-static approach (SMACOS) and a coupled dynamic approach (COUPLE). The two approaches are the same in computing wave loads on the structure. Their difference is in modeling dynamic forces of mooring lines; that is the dynamic forces are included in the computation of COUPLE but neglected in SMACOS. The numerical simulation is examined against the laboratory measurements of the JIP Spar in a water depth of 318 m. The dynamic coupling effects between the JIP Spar and its mooring lines in different water depths (318, 618 and 1018 m) are investigated by the comparison of numerical simulations obtained using the quasi-static and coupled dynamic approaches. It is found that the damping of mooring lines reduces the slow-drift surge and pitch of the Spar, especially in deep water. The reduction in the amplitude of slow-drift surge can reach about 10% in a water depth of 1018 m. The tension in mooring lines may greatly increase in the wave frequency range when dynamic forces in mooring lines are considered. The mooring-line tension in the wave frequency range predicted by the coupled dynamic approach can be eight times as great as the corresponding prediction by the quasi-static approach in a water depth of 1018 m. This finding may have important implications for the estimation of the fatigue strength and life span of the mooring lines deployed in deep water oceans.  相似文献   

白洋淀重新蓄水后的轮虫     

阎书民  张军 《海洋湖沼通报》1991,(1):46-53

1989年对白洋淀重新蓄水后的轮虫作了采样调查,共采到轮虫123种,隶属于46属12科,并对鉴定到种的轮虫作了初步分析。  相似文献   

A Moored Underwater Energy Conservation System for Profiling Measurement   总被引：3，自引：0，他引：3  

龚德俊陈永华  李思忍徐永平 姜静波 《中国海洋工程》2007,21(3):541-548

There is a need to obtain the hydrologic data including ocean current,wave,temperature and so on in the South China Sea.A new profiling instrument which does not suffer from the damage due to nature forces or incidents caused by passing ships,is under development to acquire data from this area.This device is based on a taut single point mid-water mooring system.It incorporates a small,instrumented vertically profiling float attached via an electromechanical cable to a winch integral with the main subsurface flotation.On a pre-set schedule,the instrument float with sensors is winched up to the surface if there is no ship passing by,which is defined by an on-board miniature sonar.And it can be immediately winched down to a certain depth if the sonar sensor finds something is coming.Since,because of logistics,the area can only be visited once for a long time and a minimum of 10 times per day profiles are desired,energy demands are severe.To respond to these concerns,the system has been designed to conserve a substantial portion of the potential energy lost during the ascent phase of each profile and subsequently use this energy to pull the instrument down.Compared with the previous single-point layered measuring mode,it is advanced and economica1.At last the paper introduces the test in the South China Sea.  相似文献