首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   45篇
  国内免费   1篇
  完全免费   6篇
  海洋学   52篇
  2017年   3篇
  2016年   3篇
  2014年   2篇
  2013年   1篇
  2012年   1篇
  2011年   4篇
  2010年   16篇
  2009年   2篇
  2008年   3篇
  2007年   4篇
  2006年   3篇
  2005年   3篇
  2004年   3篇
  2003年   2篇
  2002年   1篇
  1981年   1篇
排序方式: 共有52条查询结果,搜索用时 31 毫秒
1.
异源精子诱导牙鲆雌核发育二倍体   总被引:10,自引:0,他引:10  
采用紫外线照射处理的石鲽精子和受精后冷休克的方法诱导了牙鲆雌核发育。结果表明:用2只平行的相距15cm的20W紫外灯管,照射距离为10cm,在5~100s时间范围内照射石鲽精子时,受精卵的发育表现了典型的哈特维希效应,照射40s的精子所得胚胎的孵化率达到最高峰(41%),染色体观察结果显示,此照射剂量组的所有胚胎均为单倍体(n=24),表明照射精子遗传失活的有效性和可靠性。如果冷休克处理前受精卵保持在(15.5±0.5)℃,受精卵在一定的休克温度(0~10℃)条件下,用不同休克起始时间(受精后1~10min)及冷休克处理持续时间(15~90min)均能诱导染色体加倍。对冷休克处理条件的优化结果表明,在2~4℃条件下,受精后3min开始、冷休克处理45min时,二倍体诱导率最高,达79.7%。染色体鉴定显示,处理组的正常胚胎均为二倍体(2n=48),未发现单倍体和非整倍体。  相似文献
2.
海洋XML数据集成系统原型的设计与实现   总被引:6,自引:2,他引:4  
针对海洋学科中数据源的异构性,文中采用XML技术进行集成,实现了海洋数据的统一表示。本文以Java,XML和Web为支撑技术,提出并实现了1个多层B/S体系结构的海洋XML数据集成系统原型,其中利用了XML的新兴技术——可伸缩矢量图形(SVG)技术来实现基于XML的海洋数据的交互。作为国内海洋XML数据集成的第1个原型系统,旨在推动我国海洋XML的研究和开发工作。  相似文献
3.
陈国强  陈鹏 《海洋学报》2004,26(4):89-95
以厦门马銮湾为研究区域,在分析景观异质性的基础上,采用地质统计学的理论和方法并结合GIS强大的空间分析和显示功能,通过一定的数学模型和生态效应分布图的表示方法,对快速城市化过程中区域景观异质性变化和由此导致的景观生态效应程度进行了定性和定量相结合的综合评估,结果表明,城市景观的同化过程是区域景观结构和景观异质性变化的主要表现,景观生态效应空间分布图也表明城市化对应的生态学过程的规模效应在整个规划区内有扩大的趋势。  相似文献
4.
江苏条子泥岸滩剖面形态的时空异质性   总被引:2,自引:2,他引:0       下载免费PDF全文
在江苏条子泥岸滩选择3个典型剖面,对其进行了3a定期的观测,将所得剖面数据绘制成剖面形态曲线。通过对岸滩剖面形态的分析,发现3a来岸滩冲淤变化明显,岸滩剖面形态内部及其相互间都有变化,呈现不同的类型。探讨了其变化的机制,包括自然因素和人为因素。主要的研究结果将丰富人们对江苏条子泥近期岸滩及辐射沙洲演变的认识,为条子泥促淤并陆和海岸防护等工程提供科学依据。  相似文献
5.
6.
Eric C. Cruz  Qin Chen   《Ocean Engineering》2007,34(8-9):1303-1321
The transformation of nonlinear water waves over porous beds is studied by applying a numerical model based on Chen's [2006. Fully nonlinear Boussinesq-type equations for waves and currents over porous beds. Journal of Engineering Mechanics, 132:2, 220–230] Boussinesq-type equations for highly nonlinear waves on permeable beds. The numerical model uses a high-order time-marching solution and fourth-order finite-difference schemes for discretization of first-order spatial derivatives to obtain a computational accuracy consistent with the model equations. By forcing the wave celerity and spatial porous-damping rate of the linearized model to match the exact linear theory for horizontal porous bed over a prescribed range of relative depths, the values of the model parameters are optimally determined. Numerical simulations of the damped wave propagation over finite-thickness porous layer demonstrate the accuracy of both the numerical model and governing equations, which have been shown by prior theoretical analyses to be accurate for both nominal and thick porous layers. These simulations also elucidate on the significance of the higher-order porous-damping terms and the influence of the hydraulic parameters. Application of the model to the simulation of the wave field around a laboratory-scale submerged porous mound provides a measure of its capability, as well as useful insight into the scaling of the porous-resistance coefficients. For application to heterogeneous porous beds, the assumption of weak spatial variation of the porous resistance is examined using truncated forms of the governing equations. The results indicate that the complete set of Boussinesq-type equations is applicable to porous beds of nonhomogeneous makeup.  相似文献
7.
In the present study we review datasets available for the Chilean margin to assess the relationship between environmental (or habitat) heterogeneity and benthic diversity. Several factors, such as the presence of different water masses, including the oxygen-deficient Equatorial Sub-surface Waters (ESSW) at the continental shelf and upper slope, and the Antarctic Intermediate Waters (AIW) at mid slope depths appear to control the bathymetric distribution of benthic communities. The presence of methane seeps and an extended oxygen minimum zone (OMZ) add complexity to the benthic distribution patterns observed. All these factors generate environmental heterogeneity, which is predicted to affect the diversity patterns both along and across the Chilean continental margin. The response to these factors differs among different faunal size groups: meio-, macro-, and megafauna. Physiological adaptations to oxygen deficiency and constraints related to body size of each group seem to explain the larger-scale patterns observed, while sediment/habitat heterogeneity ( e.g. at water mass boundaries, hardgrounds, biogeochemical patchiness, sediment organic content, grain size) may influence the local fauna diversity patterns.  相似文献
8.
9.
10.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号