共查询到20条相似文献，搜索用时 78 毫秒
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《海洋预报》1990,(4)
145NI 150h 11.5 一16—0.8 0.6—1.7 卜口.5【32 9 30N 1160匕10.9 0.OI—0.4卜0.9 卜0.2 卜0.3 ZI 155]口3 01 02 一0.6 一0.2 l 33 165 0。gi一口.2 一口.6 一1.3 一0.71—0,2 311 160 06—05 04 02 一12一口‘7 J 34 170’0.71一口.3I一1.口 一1.5 一!.sl—0,2 4: 165.0.2 一07一口.2 0.4 一1.11—0.3工 35 175 0.6I—0.2卜0.4 一二.0]一1.of—0.5 6’170 0‘3g 0.290.gZ—0.15—0.6B—0.18D361 D180 0。20.30.3 0,口【一口.3D一口.4 6 17G 吾 081—02 D 2.0 口7 口.311.12【379 25N D125L 一口.2 卜1.l 卜口.ZJ 0.11.3 gi.0 7… 相似文献
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《海洋预报》1990,(3)
经度(”)￡12345。3 I纬度(”)经度广,Z12345150E15516口16517017518D!45E15口15516016517017518口!4D E14515口155160!6517口175180125E130135140145160 1 2 3 4 5 6 7 8 91口11121314151617181920212223242526272829304,43.64.45.76.37.l6.712.31且.二10\1口.811.712.211.711.616.717.416.917.717.l17.口且.7口16.916.416.621.020.620.120、42口.2 0.2 1.1 2.3 4.l 5.4 6.3 6.5 8.9 9.41口.z1口.3二o.了12.411.611.l16.116.915.815.715.616.215.615.615.115.口20.1二g.919!19.318.7 1.91.7 ?.sl3.8 4.6 4.7 6.OI7.0 6.18.2 9.110.l 8.… 相似文献
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《海洋预报》1993,(3)
站号纬度(”)经度(”)月 份纬Jy站号1 l(”)经度(”) 月 份123451345且2345G 1 2 3 4 5 6 7 8 9101且121314151617181920ZI2223242526272829303145N40N35N30N155【2.5 D 2 O sls/18 9 2.8 D 5.口DIG 54 713 sl3 GI3 4I41 G 0+17014 sl :3.8 4.of 3.gi 5.of 6.3 J17515 sl4.714.SI4.6]5.8 7.sl18O 5 6.0 D 54 D 59 D 5.6 8 7.O D 8.口1145匕D 8.口d 6.8 D 8.O D 8.U D 且口.8 二J.8D155 103 SO fig f 04 ti.4 i 14.2]16t) 111 SS 97 9.8 12.U ]4.U lflG 11 10 门1( ( 100 120 140 1701 1141 10.7 … 相似文献
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《海洋预报》1993,(4)
8 口112 口D 回2 o【丑10 D 8 口D 4 口D 9 吕【!生Ogl屡 s111 了198]甘u【16 2 208 21 19 0 16 2 134 26 7 D 28 4D 28 26 s 124 口IZ且727.02792821266J244 22097 3 gR fil ’y7 QI 97 9’1 91月 份站号纬度(”)经度(”)月 份7891口11127891口1112 一13 一161 04 0 of 07 of 一19 一111—10 06 0.71—0.51 —08——03—03 4I 09—04 一0 ZI 05]0 5 0 of 09—04—021 of 05L 0 ZI 10 卜0.31 一09 t一口sl一02[一0 31 07 02 —07—111一08 一06 06.of一25 02 09 101 111 181一291—06 07 06 07-SI一21[一off 10 03 00—04—… 相似文献
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《海洋预报》1993,(2)
纬度(”)经度(”)月 份hgq纬度(”)经度(“)月 份7891口1112789101145N40N35Nz0N150E155IGOIG517017518P145 E15口15516016517口175180140E145!5口15516口!65170175180125E130135140145!5口二551口.4s12.0D12.O11.4 16.0 14.6114 157 14.口IS.41 17.口D 15刀1901 227 5 21.419.7 22.SI 22.319.6I 22.3I 22.318.7 22.3 ZI.018.8]22.8 20.819.ZI 22.sl 21.319.0 J 22.G ZI.GIR7I 225;21.3Zz.4 D 27.21 状.了24.SI n.01 朋.了24.8 D 26.2 D 2巳724.61 25.31 26.623.9 25.SI 26.623.71 25.8 26.323.口g 25.2 4 26.口22.ZI … 相似文献
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港区陆域形成的填挖方量对工程经济性影响非常大,寻找精确地计算港区陆域工程量使纵向设计最优化的方法是港区工程全寿命周期各个环节的关键。基于传统方法的计算原理与应用现状分析了现有方法在港区土方计算中存在的问题,借鉴建筑信息模型BIM(Building Information Modeling)思想,对Civil 3D的土方计算原理与操作流程进行研究,最后以某港区石化仓储库区场平方案为例,参考传统计算软件HTCAD的计算结果,验证了Civil 3D在港区工程量计算中的便捷性与可靠性。结果显示:Civil 3D的计算精度比HTCAD高7%～20%,计算速度是HTCAD的数十倍,在修改过程中计算速度达数百倍。研究成果为采用Civil 3D进行港区陆域土方计算提供理论和技术依据。 相似文献
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《海洋预报》1986,(1)
1期.@.芒3@, — — 口D—D二bIJJJJJJJ二卜HIJJ三卜ZS/1二2二卜D二Z/1二]/【二1/【二卜1二]/DJ +l—— 1——[.——————一 I &【【_*L*D_.**卜_D上.]_【_入I._DD_D 卜、【ID_g D_【L*卜【D_D 鸿0 卜 卜叫二D二口1二【二1二卜卜1二卜【1】二口cb【了博亡1】二r【g了c卜1】士卜D二I 长D 门【了厂]了卜卜1了门厂g了D丁*门厂厂门1叫一1一r厂]一I丫【丫rr1一厂厂厂厂D 峪 l——I、lW——l 彤D *DI_D_/D【卜【Dg_DD_卜D_DDDDg【DDg【1 回D【1【0 迎D—117\卜卜卜r博卜11H1】】丁】1、门rrr门]Y1卜K… 相似文献
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Studying complex pore structures is the key to understanding the mechanism of shale gas accumulation. FIB-SEM (focused ion beam-scanning electron microscope) is the mainstream and effective instrument for imaging nanopores in gas shales. Based on this technology, 2D and 3D characteristics of shale samples from Lower Silurian Longmaxi formation in southern Sichuan Basin were investigated. 2D experimental results show that the pores in shale are nanometer-sized, and the structure of those nanopores can be classified into three types: organic pores, inorganic pores and micro fractures. Among the three types, organic pores are dominantly developed in the OM (organic matter) with three patterns such as continuous distributed OM, OM between clay minerals and OM between pyrite particles, and the size of organic pores range from 5 nm to 200 nm.Inveresly, inorganic pores and micro fractures are less developed in the Longmaxi shales. 3D digital rocks were reconstructed and segmented by 600 continuous images by FIB cutting and SEM imaging simultaneously. The pore size distribution and porosity can be calculated by this 3D digital core, showing that its average value is 32 nm and porosity is 3.62%.The 3D digital porosity is higher than its helium porosity, which can be regarded as one important parameter for evaluation of shale gas reserves. The 2D and 3D characterized results suggest that the nanometer-sized pores in organic matter take up the fundamental storage space for the Longmaxi shale. These characteristics have contributed to the preservation of shale gas in this complex tectonic area. 相似文献
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通常情况下 Wire- frame(线框图 )不能唯一描述 3D object。本文给出 1种基于 Wire- frame的 3D object重构求解算法。该算法获得唯一解时 ,则表明 Wire- frame对应唯一的 3D object;多个解时 ,则给出所有的可行解 相似文献
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Jonathan M. Bull Martin Gutowski Justin K. Dix Timothy J. Henstock Peter Hogarth Timothy G. Leighton Paul R. White 《Marine Geophysical Researches》2005,26(2-4):157-169
Chirp sub-bottom profilers are marine acoustic devices that use a known and repeatable source signature (1–24 kHz) to produce
decimetre vertical resolution cross-sections of the sub-seabed. Here the design and development of the first true 3D Chirp
system is described. When developing the design, critical factors that had to be considered included spatial aliasing, and
precise positioning of sources and receivers. Full 3D numerical modelling of the combined source and receiver directivity
was completed to determine optimal source and receiver geometries. The design incorporates four source transducers (1.5–13 kHz)
that can be arranged into different configurations, including Maltese Cross, a square and two separated pairs. The receive
array comprises 240 hydrophones in 60 groups whose group-centres are separated by 25 cm in both horizontal directions, with
each hydrophone group containing four individual elements and a pre-amplifier.
After careful consideration, it was concluded that the only way to determine with sufficient accuracy the source–receiver
geometry, was to fix the sources and receivers within a rigid array. Positional information for the array is given by a Real
Time Kinematic GPS and attitude system incorporating four antennas to give position, heading, pitch and roll. It is shown
that this system offers vertical positioning accuracy with a root-mean-square (rms) error less than 2.6 cm, while the horizontal
positioning rms error was less than 2.0 cm. The system is configured so that the Chirp source signature can be chosen by software
aboard the acquisition vessel.
The complete system is described and initial navigational and seismic data results are presented. These data demonstrate that
the approach of using fixed source-receiver geometry combined with RTK navigation can provide complete 3D imaging of the sub-surface. 相似文献
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Tine Missiaen 《Marine Geophysical Researches》2005,26(2-4):145-155
The design of very high resolution (VHR) 3D marine surveys not only depends on the theoretical considerations of seismic imaging,
but is also dictated by the field conditions and the available budget. The main geophysical controlling factors include the
depth and dip of the target, and horizontal and vertical resolution. Working in shallow water environments and at high frequencies
will imply constraints on sampling, array directivity and positioning accuracy. In this paper we describe the main requirements
and constraints involved in VHR 3D acquisition. The second part of the paper focuses on the flexible acquisition system “Opus3D”
recently developed for shallow water investigations. The system provides improvements in imaging resolution in a relatively
simple and cost-effective way. Acquisition and positioning constraints limit the system to nearshore studies. The experience
gained from various surveys with this new acquisition system allow us to formulate a number of practical specifications and
guidelines for 3D survey design in shallow water. 相似文献
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维生素D(VD)是一类具有抗佝偻病作用的类固醇激素,其中维生素D3(VD3)是VD在动物体内的主要存在形式。作为生命活动必不可少的一类物质,VD发挥着广泛且重要的生理学作用。VD在动物体内的代谢过程及相关的代谢酶具有较高的进化保守性,同时也受到多种因素的调控影响。由于鱼类在生活环境方面与陆生脊椎动物存在显著差异,VD在鱼类中的合成代谢及生理功能与高等动物也存在一定的区别。本文主要概述了鱼类VD3的主要来源以及需求量的研究,总结了近年来鱼类维生素D受体(VDR)、VD3代谢调控及其生理功能的研究进展,比较了鱼类和陆生高等动物在VD来源、代谢以及VDR等方面的差异,并对水生动物VD的未来研究方向进行了展望。 相似文献
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Quasi-3D Numerical Simulation of Tidal Hydrodynamic Field 总被引：2，自引：0，他引：2
SONG Zhiyao XUE Hongchao YAN Yixin MAO Lihua XU Fumin
Doctor Senior Engineer College of Harbor Waterway Coastal Engineering Hohai University 《中国海洋工程》1999,(3)
Based on the 2D horizontal plane numerical model,a quasi-3D numerical model is establishedfor coastal regions of shallow water.The characteristics of this model are that the velocity profiles can be ob-tained at the same time when the equations of the value of difference between the horizontal current velocityand its depth-averaged velocity in the vertical direction are solved and the results obtained are consistent withthe results of the 2D model.The circulating flow in the rectangular area induced by wind is simulated and ap-plied to the tidal flow field of the radial sandbanks in the South Yellow Sea.The computational results fromthis quasi-3D model are in good agreement with analytical results and observed data.The solution of the finitedifference equations has been found to be stable,and the model is simple,effective and practical. 相似文献