全文获取类型
收费全文 | 6593篇 |
免费 | 1338篇 |
国内免费 | 1769篇 |
专业分类
测绘学 | 170篇 |
大气科学 | 1863篇 |
地球物理 | 1765篇 |
地质学 | 1885篇 |
海洋学 | 2456篇 |
天文学 | 258篇 |
综合类 | 385篇 |
自然地理 | 918篇 |
出版年
2024年 | 33篇 |
2023年 | 100篇 |
2022年 | 227篇 |
2021年 | 267篇 |
2020年 | 305篇 |
2019年 | 322篇 |
2018年 | 271篇 |
2017年 | 304篇 |
2016年 | 305篇 |
2015年 | 355篇 |
2014年 | 453篇 |
2013年 | 492篇 |
2012年 | 431篇 |
2011年 | 450篇 |
2010年 | 386篇 |
2009年 | 463篇 |
2008年 | 451篇 |
2007年 | 500篇 |
2006年 | 433篇 |
2005年 | 366篇 |
2004年 | 345篇 |
2003年 | 295篇 |
2002年 | 295篇 |
2001年 | 220篇 |
2000年 | 200篇 |
1999年 | 183篇 |
1998年 | 181篇 |
1997年 | 165篇 |
1996年 | 169篇 |
1995年 | 138篇 |
1994年 | 127篇 |
1993年 | 86篇 |
1992年 | 73篇 |
1991年 | 61篇 |
1990年 | 42篇 |
1989年 | 37篇 |
1988年 | 32篇 |
1987年 | 17篇 |
1986年 | 16篇 |
1985年 | 19篇 |
1984年 | 17篇 |
1983年 | 23篇 |
1982年 | 14篇 |
1981年 | 14篇 |
1980年 | 3篇 |
1978年 | 6篇 |
1977年 | 4篇 |
1973年 | 1篇 |
1954年 | 3篇 |
排序方式: 共有9700条查询结果,搜索用时 31 毫秒
71.
青岛海陆风三维结构的数值模拟 总被引:4,自引:1,他引:4
本文采用 1个陡地形影响修正的三维中尺度流体静力的气象学模式 ,对青岛地区海陆风的日变化规律和三维结构进行了较细致的分析。结果显示 ,青岛有多支海陆风存在 ,且每支海陆风出现的时间、强度和向内陆伸展的距离有很大的不同。这其中沿岸山地的机械和热力作用扮演着重要的角色。在观测站 ,模拟结果和实测资料等方面有较好的一致性。 相似文献
72.
Seasonal and annual variations of marine sinking particulate flux during 1993~1996 in the central South China Sea 总被引:1,自引:0,他引:1
CHEN Ronghu WIESNER M G ZHENG Yulong CHENG Xinrong JIN Haiyan ZHAO Qingying ZHENG Lianfu 《海洋学报(英文版)》2007,26(3):33-43
A total of 67 samples from the upper and lower sediment traps in the central South China Sea were analyzed, which were collected during 1993~1996. It is indicated that the distribution of stable isotope values, surface primary productivity, fluxes of total particulate matter, carbonate, biogenic opal, organic carbon, planktonic foraminiferal species and their total amount exhibit obviously seasonal and annual fluctuations. High values of the fluxes occurred in the prevailing periods of the northeastern and southwestern monsoons, and the low values occurred during the periods between the two monsoons. The fluxes of some planktonic foraminiferal species (Globigerinoides sacculifer, G. ruber, Globigerinita glutinata, Neogloboquadrina dutertrei) and their percentages also exhibit two prominent peaks during the prevailing periods of the northeastern and southwestern monsoons respectively, while those of Globigerina bulloides, Globorotalia menardii and Pulleniatina obliquiloculata only exhibit one peak in the prevailing periods of the northeastern monsoon. In addition, fluxes and percentages of Globigerinoides sacculifer and Globorotalia menardii as well as the fluxes of carbonate and total amount of planktonic foraminifera decrease gradually from 1993 to 1996, and those of Globigerina bulloides, Globigerinita glutinata and biogenic opal increase gradually from 1993 to 1996. The fluxes of carbonate and organic carbon in the upper trap are higher than those in the lower one. The study indicates that the seasonal and annual variations of the sediment fluxes and planktonic foraminiferal species are mainly controlled by the changes of surface primary productivity and hydrological conditions related to the East Asian monsoon. The lower carbonate and organic carbon fluxes in the lower trap are related to the dissolution. 相似文献
73.
东海秋季典型站位沉降颗粒物通量 总被引:6,自引:0,他引:6
2002年9月在东海的长江口、中陆架区和浙江近岸上升流区三个站位放置沉积物捕获器采集沉降颗粒物。在对颗粒有机碳(POC)、颗粒有机氮(PON)和总颗粒碳(PC)元素分析基础上,采用颗粒物通量模型对沉降通量进行了研究。镜检发现细小无机颗粒物和大颗粒聚合体是三个站位沉降颗粒物的主要形式。大颗粒聚合体有住囊类、粪球聚合体、硅藻聚合体和混杂聚合体四种类型。研究结果显示,东海中陆架区和浙江近岸上升流区沉降颗粒物中POC、PON和PC的百分含量均呈现随水深增加明显降低的趋势,但在长江口,这些成分的含量低且上下均匀。长江口观测到的是大风后的一个实例,存在强烈的再悬浮,各水层颗粒物沉降通量平均(±SE)高达(319.02±65.33)g/(m2.d),尽管如此,沉降颗粒物有机态C/N值却很高(18.0±0.9),明显受陆源颗粒物的影响。POC净沉降通量在浙江近岸上升流区为961mg/(m2.d)(水深55m),在东海中陆架区为123mg/(m2.d)(水深88m),可见浙江近岸上升流区是POC向海底转移的重要区域之一,其垂直转移能力明显高于东海中陆架区。在上升流区域和中陆架区,POC的输出比率大约分别为48%—77%和15%—21%。浙江近岸上升流区和东海中陆架区底层颗粒物再悬浮比率分别为66.50%和88.52%。研究显示,浙江近岸上升流区的水体底层颗粒物受底部平流的影响比东海中陆架区相对较强。 相似文献
74.
天然感潮河道水流紊动特性分析 总被引:5,自引:0,他引:5
采用多谱勒三相流速仪,在长江口徐六泾水文观测断面分别进行了涨潮、落潮时中泓与近岸垂线的流速观测,根据这些观测资料,对天然感潮河段潮流紊动的周期、频率、概率密度函数等进行了定量的数学描述,并对时均流速、紊动强度、雷诺应力等沿垂线分布进行了分析计算。 相似文献
75.
76.
1 Indroduction The coastal zone and continental shelf area is an important region in the global biogeochemical cycle of nutrients in the ocean. This portion of the global ocean interacts closely with the continents, atmosphere and the open ocean in a comp… 相似文献
77.
A study of sea surface wave propagation and its energy deformation was carried out using field observations and numerical experiments over a region spanning the midshelf of the South Atlantic Bight (SAB) to the Altamaha River Estuary, GA. Wave heights on the shelf region correlate with the wind observations and directional observations show that most of the wave energy is incident from the easterly direction. Comparing midshelf and inner shelf wave heights during a time when there was no wind and hence no wave development led to an estimation of wave energy dissipation due to bottom friction with corresponding wave dissipation factor of 0.07 for the gently sloping continental shelf of the SAB. After interacting with the shoaling region of the Altamaha River, the wave energy within the estuary becomes periodic in time showing wave energy during flood to high water phase of the tide and very little wave energy during ebb to low water. This periodic modulation inside the estuary is a direct result of enhanced depth and current-induced wave breaking that occurs at the ebb shoaling region surrounding the Altamaha River mouth at longitude 81.23°W. Modelling results with STWAVE showed that depth-induced wave breaking is more important during the low water phase of the tide than current-induced wave breaking during the ebb phase of the tide. During the flood to high water phase of the tide, wave energy propagates into the estuary. Measurements of the significant wave height within the estuary showed a maximum wave height difference of 0.4 m between the slack high water (SHW) and slack low water (SLW). In this shallow environment these wave–current interactions lead to an apparent bottom roughness that is increased from typical hydraulic roughness values, leading to an enhanced bottom friction coefficient. 相似文献
78.
根据Taylor的湍流扩散理论和Hay、Pasquill提出的拉格朗日流和欧拉流的相关函数的相似性,用黄河三角洲埕北海域的实测资料,按四种不同方案计算出该海域的水平扩散系数和谱密度分布。指出:该海区潮流扩散系数主要受潮流的影响,其分布特征与潮流的分布基本一致,所求的水平扩散系数主要是由周期性的潮运动给予潮流扰动所致。方案4是通过富氏变换滤波消去了周期性潮流扰动,本方案计算的水平扩散系数是由周期为6h以下的小尺度涡提供能量。 相似文献
79.