全文获取类型
收费全文 | 39篇 |
免费 | 7篇 |
国内免费 | 12篇 |
专业分类
测绘学 | 4篇 |
大气科学 | 5篇 |
地球物理 | 21篇 |
地质学 | 12篇 |
海洋学 | 8篇 |
综合类 | 7篇 |
自然地理 | 1篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 5篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 5篇 |
2012年 | 1篇 |
2011年 | 1篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2007年 | 3篇 |
2002年 | 1篇 |
2000年 | 4篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有58条查询结果,搜索用时 62 毫秒
41.
基于WOA18(World Ocean Atlas)温盐数据集,分析印度洋等密度面的气候态分布,而后选取1985—1994年、1995—2004年和2005—2017年3个时段,分析等密度面的年代际变化。研究给出了11个等密度面深度的气候态分布,其中σ0=26.00 kg/m3的等密度面(参考压强为0 dbar)在 40°S附近露头,随着位势密度的增大,等密度面露头区逐渐南移直至消失;位势密度大于σ0=26.95kg/m3且小于等于σ2=37.00kg/m3的等密度面最深处均位于马达加斯加南侧,在北印度洋的深度变化不大。重点分析了σ0=26.00 kg/m3,σ1=31.87 kg/m3(参考压强为1 000 dbar),σ2=36.805 kg/m3(参考压强为2 000 dbar)3个等密度面深度和盐度的年代际变化,研究表明两者均存在显著的年代际变化。对于σ0=26.00kg/m3等密度面,深度先变浅后加深,年代际变化主要位于30°S—40°S(等密度面深度快速变化区);等密度面盐度在1995—2004年和1985—1994年的差异与2005—2017年和1995—2004年的差异中基本呈现相反的变化。 σ1=31.87kg/m3和σ2=36.805kg/m3的等密度面深度年代际变化都集中于40°S—50°S海域;总体上盐度的年代际变化前者表现为减小,后者表现为增加。 相似文献
42.
43.
1993年若羌6.6级主震-余震型地震使艾西煤矿等地边坡裂缝、山体塌陷、山石崩塌,破坏各类建筑物169016m2,地震总经济损失为277万元.这次地震是阿尔金活动断裂带最新活动的表现。 相似文献
44.
45.
46.
倾倒区容量主要受海水动力过程(潮流输沙、风暴潮和风浪掀沙等)、倾倒区面积和水深地形等因素影响。本文基于FVCOM(Finite Volume Coast and Ocean Model)三维数值模型和随机动态统计分析模型, 利用倾倒区地形演变和倾倒量资料, 探讨海水动力过程(潮流输沙、风暴潮和风浪掀沙等)和倾废活动对海底地形变化的影响, 构建海洋倾倒区容量长期演变评估模型。利用FVCOM水动力和泥沙模型计算自然状态下潮流输沙引起的地形变化, 同时结合倾倒区多年实测水深和倾倒量资料, 分析倾倒量、潮流输沙和地形变化的统计关系, 通过实际资料拟合修订系数, 作为该倾倒区海浪和风暴潮等因素输沙所造成地形变化的参考值, 以此评估倾倒区容量长期演变。在设定实际地形变化阈值的前提下, 计算倾倒区容量。以长江口1#倾倒区为例, 1#倾倒区地形抬升0.5m/a,倾倒区容量约为670万方/a,模型结果和实际批复结果吻合。同时在甬江口2#倾倒区、罗源湾倾倒区、嵊泗上川山、东碇倾倒区和温州港倾倒区等验证, 模拟结果同实际观测结果相近。 相似文献
47.
A global mass balance (Greenland and Antarctica ice sheet mass loss, terrestrial water storage) and differ- ent sea-level components (observed sea-level from satellite altimetry, steric sea-level from Ishii data, and ocean mass from gravity recovery and climate experiment, GRACE) are estimated, in terms of seasonal and interannual variabilities from 2003 to 2010. The results show that a detailed analysis of the GRACE time series over the time period 2003-2010 unambiguously reveals an increase in mass loss from the Greenland ice sheet and Antarctica ice sheet. The mass loss of both ice sheets accelerated at a rate of (392.8±70.0) Gt/a during 2003-2010, which contributed (1.09±0.19) mm/a to the global mean sea-level during this time. The net terrestrial water storage (TWS) trend was negative over the 8 a time span, which gave a small positive contribution of (0.25±0.12) mm/a. The interannual variability of the global mean sea-level was at least part- ly caused by year-to-year variability of land water storage. Estimating GRACE-based ice sheet mass balance and terrestrial water storage by using published estimates for melting glaciers, the results further show that the ocean mass increase since 2003 has resulted half from an enhanced contribution of the polar ice sheets, and half from the combined ice sheet and terrestrial water storage loss. Taking also into account the melt- ing of mountain glaciers (0.41 mm/a) and the small GRACE-based contribution from continental waters (0.25 mm/a), a total ocean mass contribution of (1.75±0.57) mm/a from 2003 to 2010 is found. Such a value represented 75% of the altimetry-based rate of sea-level rise over that period. The contributions to steric sea-level (i.e., ocean thermal expansion plus salinity effects) are estimated from: (1) the difference between altimetry-based sea-level and ocean mass change and (2) the latest Ishii data. The inferred steric sea-level rate from (1) (1.41 mm/a from 2003 to 2010) did not agree well with the Ishii-based value also estimated here (0.44 mm/a from 2003 to 2010), but phase. The cause for such a discrepancy is not yet known but may be related to inadequate sampling of in situ ocean temperature and salinity measurements. 相似文献
48.
Pseudotachylytes from the Koktokay-Ertai fault zone, Xinjiang, China, and their seismogeologic implications 总被引:1,自引:0,他引:1
Multi-period of pseudotachylytes of variable occurrences and shapes are widely outcropped in Haizikou and Mukurasen sections
of the Koktokay-Ertai fault zone. They consist of clasts and matrix. The clasts comprise fine fragments of the host rock (mylonite)
and quartz grains, while the matrix consists of cryptocrystalline and glassy materials which contain fibrous and radial microlites.
The chemical compositions of the pseudotachylytes resemble those of the host rocks. Their features indicate that the pseudotachylytes
were formed from local melting of the mylonites during the rapid movement of the fault, and that the formation depth was 10—12
km. The geologic event that produced pseudotachylytes is believed to be paleoearthquake.
Project supported by the Joint Earthquake Science Foundation. 相似文献
49.
中国东部大陆浅成热液矿床的H、O同位素地球化学 总被引:1,自引:0,他引:1
浅成热液矿床属于古地热系统。中国东部大陆边缘29个浅成热液矿床的H、O同位素组成特征证实,成矿流体源自当地大气降水。水-岩相互作用同位素交换模拟计算结果表明,浅成热液矿床形成期间水/岩比通常是高的。 相似文献
50.