全文获取类型
收费全文 | 1011篇 |
免费 | 145篇 |
国内免费 | 262篇 |
专业分类
测绘学 | 84篇 |
大气科学 | 199篇 |
地球物理 | 233篇 |
地质学 | 494篇 |
海洋学 | 184篇 |
天文学 | 22篇 |
综合类 | 105篇 |
自然地理 | 97篇 |
出版年
2024年 | 8篇 |
2023年 | 27篇 |
2022年 | 43篇 |
2021年 | 46篇 |
2020年 | 25篇 |
2019年 | 40篇 |
2018年 | 47篇 |
2017年 | 38篇 |
2016年 | 51篇 |
2015年 | 28篇 |
2014年 | 75篇 |
2013年 | 59篇 |
2012年 | 50篇 |
2011年 | 47篇 |
2010年 | 44篇 |
2009年 | 47篇 |
2008年 | 49篇 |
2007年 | 46篇 |
2006年 | 48篇 |
2005年 | 38篇 |
2004年 | 38篇 |
2003年 | 33篇 |
2002年 | 23篇 |
2001年 | 43篇 |
2000年 | 46篇 |
1999年 | 39篇 |
1998年 | 38篇 |
1997年 | 51篇 |
1996年 | 37篇 |
1995年 | 37篇 |
1994年 | 37篇 |
1993年 | 34篇 |
1992年 | 30篇 |
1991年 | 16篇 |
1990年 | 14篇 |
1989年 | 8篇 |
1988年 | 11篇 |
1987年 | 2篇 |
1986年 | 11篇 |
1985年 | 4篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 1篇 |
排序方式: 共有1418条查询结果,搜索用时 31 毫秒
771.
772.
基于景观生态学和马尔可夫模型的日本北九州土地利用分析 总被引:6,自引:0,他引:6
Based on four phases of TM images acquired in 1990, 1995, 2000 and 2005, this paper took Kitakyushu in Japan as a case study to analyze spatial change of land use landscape and corresponding effects on environmental issues guided by landscape ecology theory in virtue of combining technology of Remote Sensing with GIS. Firstly, land use types were divided into 6 classes (farmland, mountain, forestland, water body, urban land and unused land) according to national classification standard of land use, comprehensible ability of TM image and purpose of this study. Secondly, following the theory of landscape ecology analysis, 11 typical landscape indices were abstracted to evaluate the environmental effects and spatial feature changes of land use. Research results indicated that land use has grown more and more diversified and unbalanced, human activities have disturbed the landscape more seriously. Finally, transfer matrix of Markov was applied to forecast change process of land use in the future different periods, and then potential land use changes were also simulated from 2010 to 2050. Results showed that conversion tendency for all types of land use in Kitakyushu into urban construction land were enhanced. The study was anticipated to help local authorities better understand and address a complex land use system, and develop improved land use management strategies that could better balance urban expansion and ecological conservation. 相似文献
773.
774.
应用锦州地震台井下摆倾斜仪的观测资料,对大华北地区中强地震前的形变异常形态及特征进行了初步分析与探讨。 相似文献
775.
Ajiao?Chen Xinguang?HeEmail authorView authors OrcID profile Huade?Guan Yi?Cai 《Theoretical and Applied Climatology》2018,132(1-2):71-88
In this study, the trends and periodicity in climate extremes are examined in Hunan Province over the period 1960–2013 on the basis of 27 extreme climate indices calculated from daily temperature and precipitation records at 89 meteorological stations. The results show that in the whole province, temperature extremes exhibit a warming trend with more than 50% stations being statistically significant for 7 out of 16 temperature indices, and the nighttime temperature increases faster than the daytime temperature at the annual scale. The changes in most extreme temperature indices show strongly coherent spatial patterns. Moreover, the change rates of almost all temperature indices in north Hunan are greater than those of other regions. However, the statistically significant changes in indices of extreme precipitation are observed at fewer stations than in extreme temperature indices, forming less spatially coherent patterns. Positive trends in indices of extreme precipitation show that the amount and intensity of extreme precipitation events are generally increasing in both annual and seasonal scales, whereas the significant downward trend in consecutive wet days indicates that the precipitation becomes more even over the study period. Analysis of changes in probability distributions of extreme indices for 1960–1986 and 1987–2013 also demonstrates a remarkable shift toward warmer condition and increasing tendency in the amount and intensity of extreme precipitation during the past decades. The variations in extreme climate indices exhibit inconstant frequencies in the wavelet power spectrum. Among the 16 temperature indices, 2 of them show significant 1-year periodic oscillation and 7 of them exhibit significant 4-year cycle during some certain periods. However, significant periodic oscillations can be found in all of the precipitation indices. Wet-day precipitation and three absolute precipitation indices show significant 1-year cycle and other seven provide significant power at the 4-year period, which are mainly found during 1970–1980 and after 1992. 相似文献
776.
针对WRF模式中各非绝热物理过程,选用不同的参数化方案,对2009年6月29—30日一次梅雨锋暴雨过程做24 h降水预报的敏感性试验,并组成18个成员做物理集合预报,分析了实况与模拟的24 h降水量及其TS评分和离散度。结果表明,WRF模式的物理集合预报可成功模拟出3个暴雨中心的位置及强度;选用Lin et al微物理方案、MRF行星边界层方案和Betts-Miller-Janjic积云对流方案对湖北省西南部地区暴雨中心的位置及强度的模拟最好;3个暴雨中心均对应于离散度的大值中心,在降水较强时段其离散度也较大;不同集合成员在某时段预报的降水量可较好体现该时段的降水概率,而由物理集合预报得到的逐时降水量则可为定时降水预报提供依据。 相似文献
777.
Yuanhong Guan Bohua Huang Jieshun Zhu Zeng-Zhen Hu James L. Kinter III 《Climate Dynamics》2014,43(3-4):1141-1157
The mechanism of the South Pacific Ocean Dipole (SPOD) mode is examined, using a 50-year simulation of the Climate Forecast System, version 2 (CFSv2) and 50-year observation-based ocean–atmosphere analyses (1961–2010). It is shown that the SPOD, a sea surface temperatures (SST) seesaw between the subtropics and extratropics, is the dominant mode of the interannual variability in the South Pacific in both observations and CFSv2 simulation. CFSv2 also reproduces the seasonal phase-locking of the observed SPOD, with the anomaly pattern developing in austral spring, peaking in summer, and decaying in autumn. Composite analyses based on both observational and model data suggest that in the warm phase of SPOD, positive SST anomaly (SSTA) is initiated by weakened westerly winds over the central South Pacific in austral spring, which suppress the surface evaporative heat loss and reduce the oceanic mixed layer depth, both contributing to the SST warming. The wind-SST-mixed layer anomalies then evolve coherently over the next two seasons while the cold SSTA develops to the north. The wind perturbations are in turn a response to El Niño-Southern Oscillation (ENSO), which forces an atmospheric planetary wave train, the Pacific-South American pattern, emanating from an anomalous heat source in the tropical western Pacific. Moreover, SPOD is significantly correlated with the southern annular mode (SAM) while the latter is also significantly correlated with the ENSO index. This suggests that ENSO’s influence on the SPOD may be partially conveyed through SAM. 相似文献
778.
亚洲夏季风结构和变动与大气运动流场的斜压和正压特征:正压模分析 总被引:8,自引:0,他引:8
使用ECMWF1980—1986年7a格点资料对大气运动的正压模进行了分析。指出:对流层中大气正压运动流场显示的副热带高压带仅能反映出行星风带的季节性移动;与亚洲夏季风有关且反映季风局地性的则是副热带高压带南侧的东风带上的波状扰动;东风带上的经向风分量存在着纬向传播且传播方向和扰动幅度与印度、东亚季风子系统有关;随着北半球夏季的到来,亚洲季风区大气运动的斜压模有较大的增长且斜压运动动能占气柱内整层平均总动能的绝大部分,而在赤道附近的其他经度上则是正压运动动能的成分明显增长。 相似文献
779.
780.
根据福建地震台网的地震目录,利用各个地震事件前4台的P波到时对Tnow定位方法和4台连续定位方法进行检验,结果表明,两种方法的定位结果相差不大,大部分地震事件的定位偏差也都较小;随震中距的增大,两种方法对网外地震的定位偏差可能增大,这可能和台站集中在震中的一侧、参与定位的台站与地震之间的张角较小有关。波速结构对4台连续定位方法的定位结果存在一定的影响,选择合适的速度模型将有助于改善地震预警定位结果。采用Tnow定位方法不能定位的地震事件相对于4台连续定位方法要多,这可能是由于Tnow定位方法应用了未触发台站的信息,而部分P波到时信息因台站断记或震相记录不清晰等原因而未在地震目录中体现导致的;综合考虑两种定位方法的局限性有助于提高地震预警系统的稳定性和可靠性。 相似文献