全文获取类型
收费全文 | 16663篇 |
免费 | 3554篇 |
国内免费 | 4907篇 |
专业分类
测绘学 | 2015篇 |
大气科学 | 2736篇 |
地球物理 | 3677篇 |
地质学 | 9991篇 |
海洋学 | 2339篇 |
天文学 | 463篇 |
综合类 | 1730篇 |
自然地理 | 2173篇 |
出版年
2024年 | 182篇 |
2023年 | 486篇 |
2022年 | 1057篇 |
2021年 | 1197篇 |
2020年 | 1016篇 |
2019年 | 1054篇 |
2018年 | 1211篇 |
2017年 | 1029篇 |
2016年 | 1137篇 |
2015年 | 1192篇 |
2014年 | 1247篇 |
2013年 | 1302篇 |
2012年 | 1382篇 |
2011年 | 1395篇 |
2010年 | 1319篇 |
2009年 | 1186篇 |
2008年 | 1059篇 |
2007年 | 944篇 |
2006年 | 801篇 |
2005年 | 664篇 |
2004年 | 486篇 |
2003年 | 433篇 |
2002年 | 426篇 |
2001年 | 398篇 |
2000年 | 355篇 |
1999年 | 384篇 |
1998年 | 258篇 |
1997年 | 261篇 |
1996年 | 211篇 |
1995年 | 166篇 |
1994年 | 191篇 |
1993年 | 132篇 |
1992年 | 122篇 |
1991年 | 91篇 |
1990年 | 64篇 |
1989年 | 56篇 |
1988年 | 50篇 |
1987年 | 35篇 |
1986年 | 23篇 |
1985年 | 24篇 |
1984年 | 5篇 |
1983年 | 13篇 |
1982年 | 13篇 |
1981年 | 8篇 |
1980年 | 11篇 |
1979年 | 18篇 |
1976年 | 3篇 |
1958年 | 11篇 |
1957年 | 7篇 |
1954年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Ecological characteristics of Walleye pollock eggs and larvae in the southeastern Bering Sea during the late 1970s 总被引:1,自引:0,他引:1
Kyung-Mi Jung Sukyung Kang Suam Kim Arthur W. Kendall Jr. 《Journal of Oceanography》2006,62(6):859-871
Walleye pollock (Theragra chalcogramma) is an ecologically and economically important groundfish in the eastern Bering Sea. Its population size fluctuates widely,
driving and being driven by changes in other components of the ecosystem. It is becoming apparent that dramatic shifts in
climate occur on a decadal scale, and these “regime shifts” strongly affect the biota. This paper examines quantitative collections
of planktonic eggs and larvae of pollock from the southeastern Bering Sea during 1976–1979. Mortality, advection, and growth
rates were estimated, and compared among the years encompassing the 1970s’ regime shift. These data indicate that pollock
spawning starts in late February over the basin north of Bogoslof Island. Over the shelf, most spawning occurs north of Unimak
Island near the 100 m isobath in early or mid April. Pollock eggs are advected to the northwest from the main spawning area
at 5–10 cm/sec. Larvae are found over the basin north of Bogoslof Island in April, and over the shelf between Unimak Island
and the Priblof Islands in May. Compared to 1977, the spawning period appeared to be later in 1976 (a cold year) and earlier
in 1978 (a warm year) in the study area. At the lower temperatures in 1976, egg duration would be longer and thus egg mortality
would operate over a longer period than in the other years. Mean larval growth appeared to be lower in 1976 than in 1977 and
1979. Estimated egg mortality rate in 1977 was 0.6 in April and 0.3 in early May. 相似文献
22.
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
23.
Discussion on Coastal Erosion Near Xizhuang, Penglai, China 总被引:1,自引:0,他引:1
Wu Guiqiu Li Wei Professor First Institute of Oceanography State Oceanic Administration Qingdao Associate Researcher 《中国海洋工程》1994,(2)
-In this work, on the basis of the characteristics of coastal erosion near Xizhuang (Penglai, Shandong, China) and the in-situ measured data and theoretical calculation, the causes of coastal erosion there are obtained: (1) natural erosion, (2) beach sand borrowing, and (3) sand borrowing at the Dengzhou shoal near Xizhuang, which results in the loss of the function of the wave force resistance of the shoal. Since the wave energy is increased, the longshore sediment transport rate is increased. Coastal erosions are more and more serious. A scientific basis to reduced the calamity of coastal erosion in local area is presented. Some experiences are accumulated for studying coastal erosion. 相似文献
24.
在浅层工程折射地震测量中 ,通常采用相遇观测系统采集数据和相应的解释方法进行解释 ;对于单边观测采集方法由于与其相应的解释方法较少而少被采用。本文提出 1种方法简单、精度可靠、可直接利用同一点相邻 2排列 2次观测的初至折射时间并适合于海洋走航式单边连续观测系统的折射初至资料解释方法。其精度基本与同观测段的采用相遇观测的差异时距方法解释的精度十分接近。该方法即适合于人工解释又适合于计算机自动解释。 相似文献
25.
26.
Young-Ok Kim Eun Jin Yang Jung-Hoon Kang Kyoungsoon Shin Man Chang Cheol Soo Myung 《Ocean Science Journal》2007,42(1):9-17
The summer distributions of planktonic microbial communities (heterotrophic and phtosynthetic bacteria, phtosynthetic and
heterotrophic nanoflagellates, ciliate plankton, and microphytoplankton) were compared between inner and outer areas of Lake
Sihwa, divided by an artificial breakwater, located on the western coast of Korea, in September 2003. The semienclosed, inner
area was characterized by hyposaline surface water (<17 psu), and by low concentrations of dissolved oxygen (avg. 0.4 mg L1) and high concentrations of inorganic nutrients (nitrogenous nutrients >36 μM, phosphate <4 μM) in the bottom layer. Higher
densities of heterotrophic bacteria and nanoflagellates also occurred in the inner area than did in the outer area, while
microphytoplankton (mainly diatoms) occurred abundantly in the outer area. A tiny tintinnid ciliate, Tintinnopsis nana, bloomed
into more than 106 cells L1 at the surface layer of the inner area, while its abundance was much lower (103-104 cells L1) in the outer area of the breakwater. Ciliate abundance was highly correlated with heterotrophic bacteria (r = 0.886, p <
0.001) and heterotrophic flagellates (r = 0.962, p < 0.001), indicating that rich food availability may have led to theT. nana bloom. These results suggest that the breakwater causes the eutrophic environment in artificial lakes with limited flushing
of enriched water and develops into abundant bacteria, nanoflagellates, and ciliates. 相似文献
27.
海浪日最大波高序列的一种标度性质 总被引:1,自引:0,他引:1
应用重标度分析方法研究小麦岛海洋观测站1961-1980年二十年海浪日最大波高序列时发现,该序列并不是相互独立的,而是具有记忆性和持久性,详细的论证表明分式布朗运动模型是描述海浪日最大波高序列的一个较好的模型,同时,应用分式布朗运动模型我们找到了存在于海浪日最大波高序列中的一种标度性质-累积离差(t)的统计自仿射性。 相似文献
28.
采集设备采集数据发送到值班PC机,在无人干预的情况下接收处理软件自动对数据进行回放和进一步处理,为用户提供数据产品和服务,并提供一个界面,使用户能够了解系统的运行状况,获得相关数据和状态参数。 相似文献
29.
雪宝顶碱性花岗岩岩石地球化学与成矿控制 总被引:7,自引:0,他引:7
对雪宝顶碱性花岗岩具有高丰度的W、Sn、Be含量和W、Sn矿化花岗岩的微量元素组合特征进行了分析,结果显示:稀土元素具有∑REE含量与LREE/HREE比值偏低和负Eu异常的特点;元素比值K/Rb,U/Th,Nb/Ta的规律性变化以及矿脉产状特征等表明W-(Sn)-Be脉状矿床形成于岩浆演化晚期,与岩浆期后的热液活动有关。 相似文献
30.
桩式离岸堤保滩促淤工程消浪效果试验研究 总被引:9,自引:0,他引:9
在上海奉贤南北港保滩促淤工程中,采用了一种新型结构型式-桩式离岸堤,并通过物理模式试验进行了桩式离岸堤消浪效果研究。针对离岸堤通常建于近岸水区破波带的特点,重点研究水深,堤高以及堤身结构对波浪衰减的影响,同时对桩式离岸堤堤后水域的波浪底流速 分析探讨。研究结果表明,桩式离岸堤不仅具有良好的消浪效果。而且可在较大范围内改变波态,即由引起水体剧烈紊动的破波转变为浅水推进波,从而有效地改善海滩上的动力条件,促进海滩免受侵蚀,是一种具有广泛应用前景和新型保滩促淤结构。 相似文献