全文获取类型
收费全文 | 3441篇 |
免费 | 741篇 |
国内免费 | 1058篇 |
专业分类
测绘学 | 112篇 |
大气科学 | 828篇 |
地球物理 | 1945篇 |
地质学 | 1354篇 |
海洋学 | 421篇 |
天文学 | 23篇 |
综合类 | 149篇 |
自然地理 | 408篇 |
出版年
2024年 | 17篇 |
2023年 | 68篇 |
2022年 | 128篇 |
2021年 | 150篇 |
2020年 | 182篇 |
2019年 | 207篇 |
2018年 | 208篇 |
2017年 | 154篇 |
2016年 | 193篇 |
2015年 | 211篇 |
2014年 | 246篇 |
2013年 | 257篇 |
2012年 | 225篇 |
2011年 | 254篇 |
2010年 | 207篇 |
2009年 | 261篇 |
2008年 | 219篇 |
2007年 | 246篇 |
2006年 | 227篇 |
2005年 | 191篇 |
2004年 | 169篇 |
2003年 | 169篇 |
2002年 | 137篇 |
2001年 | 106篇 |
2000年 | 119篇 |
1999年 | 76篇 |
1998年 | 92篇 |
1997年 | 101篇 |
1996年 | 91篇 |
1995年 | 76篇 |
1994年 | 71篇 |
1993年 | 45篇 |
1992年 | 39篇 |
1991年 | 28篇 |
1990年 | 23篇 |
1989年 | 19篇 |
1988年 | 7篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 5篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1978年 | 2篇 |
排序方式: 共有5240条查询结果,搜索用时 15 毫秒
31.
光照强度对海洋微藻脂肪含量及脂肪酸组成影响的研究 总被引:1,自引:0,他引:1
近年来,海洋微藻脂肪酸组成的研究及其应用越来越受到国内外科学家的重视。高度不饱和脂肪酸(PUFA),特别是长链的n-3 PUFA,如二十碳五烯酸(EPA)和二十二碳六烯酸(DHA)对海洋动物和人类都具有营养学和医学上的价值。在海洋微藻的培养过程中,光照强度是海洋微藻生长的条件之一,光线的明与暗,光度的强与弱,不仅对微藻的生长速率、产量有影响,而且对其脂肪含量和脂肪酸的组成也有影响(Teshima et al.,1983;Thompson et al.,1990; Renaud et al., 1991)。
作者在以往研究的基础上,选择了3种有代表性的海洋微藻:(1)小球藻Chlorella sp-2(李荷芳等,1999),此藻脂肪酸中EPA含量高、且不含DHA;(2)球等鞭金藻(Isochrysis galbana),该藻DHA含量较高,但几乎不含EPA;(3)前沟藻(Amphidinium sp.)的EPA、DHA含量均高。将以上3种微藻作为原料,在不同的光照强度下进行培养,测定并分析藻体中的脂肪含量和脂肪酸组成的变化,从而了解光强对海洋微藻脂肪含量及其脂肪酸组成的影响。 相似文献
32.
33.
提出将基于动态特性的检测方法与局部物理检测手段相结合的探伤思路。利用动力学方法进行实时监测及损伤区域的粗略定位,再由物理探测方法实现损伤程度和位置的精确判断,从而降低对动态检测方法的精度要求。此外,文中尝试直接由结构的动力响应信号构建能量指标识别结构损伤的方法,不需要进行模态参数识别,算法简单,有望应用于海洋平台、高层建筑等可简化为串联多自由度体系的结构的实时监测和损伤初步定位。 相似文献
34.
Ulla Botelho Machado 《Applied Ocean Research》2002,24(6):321-330
In this article a method to estimate the mean upcrossing intensity, μ(u), of a stochastic process is proposed. It is assumed that the stochastic process is a sum of a Gaussian process and a second-order correction term. The method is based on the two-dimensional Saddlepoint approximation. The accuracy of the method is tested on processes having analytical solutions for μ(u). Numerical examples are given where the stochastic process represents (i) the horizontal response of a floating offshore structure in a Gaussian sea, and (ii) the response of a structure subjected to a Gaussian wind velocity process. In addition, the estimates are compared to empirical upcrossing intensities of simulated responses. For case (ii), the obtained μ(u) estimates are compared to estimates obtained by numerical integration. 相似文献
35.
Lawrence W. Harding Jr Blanche W. Meeson Thomas R. Fisher Jr 《Estuarine, Coastal and Shelf Science》1986,23(6)
Chesapeake Bay is a large and productive estuary that has received close scrutiny in recent years because of indications that its water quality and biota have been damaged by man's activities. Data on primary production for the estuary as a whole, however, are surprisingly sparse. We describe here the distribution of photosynthetic carbon assimilation by phytoplankton in Chesapeake Bay, and relate productivity patterns to hydrographic characteristics of the estuary. Between March 1982 and April 1983, a series of four cruises was conducted on Chesapeake Bay, and two cruises on the urbanized Delaware Bay for comparison. The upper Chesapeake and Delaware were highly turbid with high concentrations of suspended particulate matter and dissolved inorganic nutrients. Low chlorophyll concentrations were usually found in these areas of high turbidity, despite the abundance of nutrients, suggesting light limitation. Application of Wofsy's (1983) model of phytoplanton growth confirmed this suggestion. Chlorophyll and productivity maxima usually occurred seaward of the turbidity maxima where light penetration increased and suffient nutrients were present to support active phytoplankton growth. Further seaward of the chlorophyll maxima in the Chesapeake, the photic zone depth increased, concentrations of nutrients decreased, and phytoplankton biomass decreased, suggesting that nutrient availability, rather than light, controlled phytoplankton growth in the lower portion of the estuary. In contrast to the Chesapeake, Delaware Bay was more turbid, had generally higher nutrient concentrations, and was lower in phytoplankton productivity. The chlorophyll maxima and region of rapid phytoplankton growth occurred further toward the lower estuary and shelf regions in Delaware Bay because the high turbidity extended further seaward. Nutrients were never depleted at the shelf end of the estuary sufficiently to retard phytoplankton growth. Photosynthesis-irradiance (P-I) curves from simulated in situ and constant intensity incubations showed a strong correlation of the light-limited slope (aB) with the light-saturated rate (
) on each cruise. Spatial variations in
corresponded to patterns of phytoplankton abundance, as did integral production (PP) and carbon-based growth rates (μC, μm), and photosynthetic parameters varied significantly with temperature. 相似文献
36.
1 .IntroductionInthe whole service period of the platforms ,some damage is unavoidable due to the corrosion,impact ,fatigue and so on.The damage whould cause the structures’ultimate capacity and safety de-crease .Presently,it is generally acceptedthat the detection of damage involes considerable statisticaluncertainties,thus lot of efforts is made for the damage probalility model ,for example Song and Lu(1996) usedthefuzzy-settheoryto estimatethe humanerrorsthroughthe definitionof inspection… 相似文献
37.
礁膜配子放散条件的研究 总被引:2,自引:0,他引:2
本文报道了礁膜配子的放散与温度、光照、比重的关系。结果表明,自然海区的礁膜在白天大量放散配子。配子放散的适宜温度为19-21℃;光照为2000-5000lx时能促进配子大量放散出来;配子放散的适宜比重为1.05-1.025;这些研究结果将为礁膜人工育苗提供一些科学依据。 相似文献
38.
哀牢山-红河断裂带中段应变分析 总被引:1,自引:0,他引:1
对哀牢山—红河断裂带中段和平—水塘剖面、墨江—元江剖面和其它地段的岩石应变及磁组构进行了分析,表明应变强度的校正磁各向异性度PJ从断裂带向西至三叠系明显降低,变形强度向西迅速减弱。磁化率椭球体主轴展布反映出剪切带内、外变形方式的改变。剪切带内,以水平走滑运动为主;向西则以水平缩短为主。在应变分析中,对断裂带内的S—C组构两组面理夹角、杏仁体和石榴石应变标志体进行了测量,结果显示,剪切带内的磁组构和岩石组构间关系较差。此外,还对这两条剖面中的三叠系进行了应变和磁组构分析,找出了它们与磁化率椭球体对应轴率间的相关性。 相似文献
39.
Risk Assessment for Tuzla Naval Base Breakwater 总被引:5,自引:0,他引:5
Can Elmar BALAS 《中国海洋工程》2003,17(3)
1 .IntroductionTurkeywasstruckbytwomajorearthquakeeventsonAugust 1 7thandNovember 1 2th ,1 999,namedIzmit (Mw=7.4 )andD櫣zce (Mw=7.2 )earthquakes,respectively .ThestationsoperatedbytheGeneralDirectorateofDisasterAffairs,theKandilliObservatoryandEarthquakeResearchInstituteofIstanbulTechnicalUniversitymeasuredatleast 2 7stronggroundmotionsfortheIzmitearthquakewithin 2 0 0kmofthefault.AsignificantsegmentofthefaultrupturedintheareabetweenthewestofGolcukandtheeastofLakeSapanca .Inthesou… 相似文献
40.