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   3933篇
  免费   1194篇
  国内免费   873篇
测绘学   198篇
大气科学   968篇
地球物理   2044篇
地质学   1274篇
海洋学   685篇
天文学   207篇
综合类   291篇
自然地理   333篇
  2024年   7篇
  2023年   41篇
  2022年   109篇
  2021年   129篇
  2020年   148篇
  2019年   210篇
  2018年   176篇
  2017年   166篇
  2016年   184篇
  2015年   216篇
  2014年   253篇
  2013年   237篇
  2012年   249篇
  2011年   261篇
  2010年   240篇
  2009年   342篇
  2008年   293篇
  2007年   355篇
  2006年   319篇
  2005年   248篇
  2004年   270篇
  2003年   219篇
  2002年   186篇
  2001年   130篇
  2000年   139篇
  1999年   121篇
  1998年   104篇
  1997年   109篇
  1996年   87篇
  1995年   67篇
  1994年   63篇
  1993年   72篇
  1992年   47篇
  1991年   46篇
  1990年   39篇
  1989年   20篇
  1988年   20篇
  1987年   19篇
  1986年   10篇
  1985年   7篇
  1983年   7篇
  1982年   8篇
  1981年   4篇
  1980年   4篇
  1979年   4篇
  1978年   7篇
  1977年   4篇
  1954年   4篇
排序方式: 共有6000条查询结果,搜索用时 328 毫秒
31.
A Computational Model for Velocity Separation in Shallow Sea   总被引:1,自引:0,他引:1  
SONG  Zhiyao 《中国海洋工程》2002,16(3):407-413
Based on the hydrodynamical feature and the theoretical velocity profiles of tidal flow and vvind-induced flow in shal-low sea, a computational model is established for the first time, which can separate observed velocity into tidal velocity and wind-induced velocity by use of the least square method. With the model, not only the surface velocities of tidal flow and vvind-induced flow are obtained, but also the bed roughness height is determined and the wind velocity above the wa-ter surface is estimated. For verification of the model, the observed velocity in the Yellow River Estuary and the laborato-ry test is separated, then it is applied to the Yangtze River Estuary. All the results are satisfactory. The research results show that the model is simple in method, feasible in process and reasonable in result. The model is a valid approach to analysis and computation of field dala, and can be applied to separate the observed velocity in shallow sea; at the same time, reasonable boundary conditions of th  相似文献   
32.
采用TOGA/COARE国际合作考察期间(1992年10月─1993年2月)获得的267次定点(2°S,155°E)定时高空大气探测资料,进行计算分析,发现1992年12月─1993年2月低空存在一支西风急流,有两次分别持续半月之久,而1992年11月的两次赤道西风急流,因无赤道高空急流配合,仅持续2d便消失。本文还指出:(1)赤道低空西风急流是各种海-气指数产生ENSO异常的重要信息;(2)赤道高空急流有滞后赤道低空急流2d左右的响应关系;(3)赤道低空急流是纬向水汽输送的狭窄通道。  相似文献   
33.
In this paper,the characteristics of density current under the action of waves are describedwith the help of flume experiment and theoretical analysis.The study shows that turbid water under the ac-tion of the waves can present three types of motion,i.e.significant stratification,fragile stratification andstrong mixing.The motion of turbid water presents significant stratification when(H/D)/△ρ/ρ~(1/2)≤4.5,generally this state is known as density current.The formulas of motionvelocity,thickness,and discharge of density current moving on horizontal bottom are derived by use of ba-sic equations such as momemtum equation,equation of energy conservation and continuity equation offluid.The time-average velocity and the thickness of density current under the action of waves have a rela-tionship with such parameters as relative density(△ρ/ρ),wave height(H),and water depth(D).Whenthese parameters are determined,the time-average thickness and motion velocity of density current are al-so determined.The relat  相似文献   
34.
波浪作用下异重流运动特性研究   总被引:3,自引:0,他引:3  
本文通过水槽试验和理论分析手段对波浪作用下异重流运动特性进行了研究,应用流体运动基本方程推导了异重流在水平底面运动时的运动速度、厚度和流量表达式。结果表明,计算结果与水槽试验较一致  相似文献   
35.
- This paper, after briefly reviewing the experimental research on sediment transport on muddy beach since the 1950s, improves and perfects the method for forecasting siltation in navigation channels and harbour basins which was first put forward in China by the authors. In consideration of silty sediment and sand, some factors in forecasting methods have been changed and modified. Consequently, the modified methods can be used either to compute siltation in navigation channels and harbour basins on muddy beach or to compute siltation and scouring in navigation channels and harbour basins on both silty beach and sandy beach. The verification of field data from eleven large, medium and small natural harbours shows a good agreement between the forecasting by the modified method and the natural conditions. Finally, the paper deals with the rational utilization of water area after the construction of the West Dyke in Lianyungang, the maintenance of water depth of the navigation channel at the entrance, siltation distribution, siltation in the navigation channel and harbour basin for ships of 100 thousand tonnnage. Results once again prove that the prospect of constructing Lianyungang Harbour into a deepwater harbour is bright.  相似文献   
36.
李赶先  卢博 《台湾海峡》2001,20(3):308-313
本文在南沙群岛永署礁南永1井珊瑚礁岩心声速测量的基础上,研究了珊瑚礁岩心声速的垂向跃变特征和相应地层沉积相变及地层侵蚀间断面的关系,分析了珊瑚礁岩心相变造成其声速跃变的原因,阐明了海平面升降形式珊瑚礁地层侵蚀间断面和产生相变的具体过程, 明了珊瑚礁岩心声速垂向跃变与相应地层古气候和海平面变化的关系,该项研究在岛礁工程建设和礁灰岩区石油勘探声学测井以及西太平洋边缘海古海洋学研究学方面具有重要的实用价值和理论意义。  相似文献   
37.
An instrument which measures the velocity and direction of benthic water currents at depths of up to 80 m is described. Characteristics of this meter include: (i) readings are not affected by water flow during sinking or retrieval; (ii) it is portable; (iii) it operates unattended; (iv) it is inexpensive; and (v) it requires only simple maintenance. A timing circuit which operates two time periods in succession is used to activate and de-activate a revolution counter and a fluidfilled compass which are mounted on a special frame and vane system. In the field, the instrument accurately measured average current velocities of up to 6 m s−1. Data are presented which illustrate the usefulness of this instrument in describing the velocity and direction of benthic currents along the east coast of Australia and demonstrate a positive correlation between benthic current velocity and catch rates of the commercially-exploited spanner crab Ranina ranina.  相似文献   
38.
To solve problems concerning wave elements and wave propagation, an effective way is the wave energy balance equation, which is widely applied in oceanography and ocean dynamics for its simple computation. The present papaer advances wave energy balance equations considering lateral energy transmission and energy loss as the governing equation for the study of wave refraction-diffraction. For the mathematical model, numerical simulation is made by means of difference method, and the result is verified with two examples.  相似文献   
39.
口服免疫药物后中国对虾某些血淋巴因子的测定及方法研究   总被引:53,自引:0,他引:53  
于1991年4-9月,以海捕中国对虾亲虾及养殖中国对虾为材料,运用单向免疫扩散(SRID)方法测定对虾血淋巴免疫因子,并采用经改进后的Horowitz等人的方法测定对虾体内的酚氧化酶(PO)活性,目的在于运用该两种方法对口服不同免疫药物的养殖对虾的血淋巴免疫因子及PO活力进行测定。对亲虾和养殖对虾口服不同免疫药物前后的测定结果表明,几种情况下的对虾血淋巴中均存在类似IgM的因子,血细胞中存在酚氧化  相似文献   
40.
1 .Introduction Wave breaking and associated whitecapping have long beeninteresting due totheir close relationto many fields of ocean study,including air-sea interaction,remote sensing,ocean engineering,aswell as wave dynamics .The breaking probabilityBan…  相似文献   
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