全文获取类型
收费全文 | 1186篇 |
免费 | 297篇 |
国内免费 | 587篇 |
专业分类
测绘学 | 7篇 |
大气科学 | 954篇 |
地球物理 | 354篇 |
地质学 | 314篇 |
海洋学 | 73篇 |
天文学 | 147篇 |
综合类 | 38篇 |
自然地理 | 183篇 |
出版年
2024年 | 8篇 |
2023年 | 31篇 |
2022年 | 19篇 |
2021年 | 31篇 |
2020年 | 52篇 |
2019年 | 67篇 |
2018年 | 41篇 |
2017年 | 51篇 |
2016年 | 52篇 |
2015年 | 67篇 |
2014年 | 66篇 |
2013年 | 116篇 |
2012年 | 68篇 |
2011年 | 75篇 |
2010年 | 66篇 |
2009年 | 83篇 |
2008年 | 85篇 |
2007年 | 127篇 |
2006年 | 91篇 |
2005年 | 103篇 |
2004年 | 73篇 |
2003年 | 82篇 |
2002年 | 69篇 |
2001年 | 47篇 |
2000年 | 61篇 |
1999年 | 68篇 |
1998年 | 62篇 |
1997年 | 43篇 |
1996年 | 49篇 |
1995年 | 30篇 |
1994年 | 45篇 |
1993年 | 30篇 |
1992年 | 17篇 |
1991年 | 25篇 |
1990年 | 9篇 |
1989年 | 11篇 |
1988年 | 19篇 |
1987年 | 7篇 |
1986年 | 7篇 |
1985年 | 5篇 |
1984年 | 1篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
排序方式: 共有2070条查询结果,搜索用时 31 毫秒
61.
The numerical model of convection in magma sills is developed. The model is based on a full system of equations of fluid dynamics and includes heat transfer, buoyancy effects and diffusion of some minor component (marker). Solidification is treated as a phase transition. The results indicate that there are some qualitative differences between very thin sills with Rayleigh number Ra = 105 and thin sills with Ra = 106. For a basaltic magma the first case corresponds to the thickness of the sills of approximately 30 cm and the second case corresponds to the thickness of 60 cm. In the first case mixing is inefficient and conduction is the dominant form of heat transfer. In the second case mixing is efficient and convection is the dominant form of heat transfer. Some of the results can be scaled for the more viscous magmas in thicker sills. 相似文献
62.
63.
64.
65.
Xiong Xiong* Institute of Geodesy Geophysics Chinese Academy of Sciences Wuhan China Institute of Geology Geophysics Chinese Academy of Sciences Beijing China Wang Jiye Institute of Geodesy Geophysics Chinese Academy of Sciences Wuhan China Graduate School Chinese Academy of Sciences Beijing China Teng Jiwen Institute of Geology Geophysics Chinese Academy of Sciences Beijing China 《中国地质大学学报(英文版)》2005,16(4)
INTRODUCTION Volcanoesaremostlyobservedinoceanicridges,hotspotsandcontinentalriftzones(Hongetal.,2003),andarerarelyobservedincontinentalinteri ors.However,sincethevolcanoeswithintheconti nentinteriorscannotbeattributedtotheplate/block marginprocess,theydr… 相似文献
66.
67.
The June 2013 Alberta catastrophic flooding event – part 2: fine‐scale precipitation and associated features 下载免费PDF全文
B. Kochtubajda R. E. Stewart S. Boodoo J. M. Thériault Y. Li A. Liu C. Mooney R. Goodson K. Szeto 《水文研究》2016,30(26):4917-4933
Data obtained from a variety of sources including the Canadian Lightning Detection Network, weather radars, weather stations and operational numerical weather model analyses were used to address the evolution of precipitation during the June 2013 southern Alberta flood. The event was linked to a mid‐level closed low pressure system to the west of the region and a surface low pressure region initially to its south. This configuration brought warm, moist unstable air into the region that led to dramatic, organized convection with an abundance of lightning and some hail. Such conditions occurred in the southern parts of the region whereas the northern parts were devoid of lightning. Initially, precipitation rates were high (extreme 15‐min rainfall rates up to 102 mm h?1 were measured) but decreased to lower values as the precipitation shifted to long‐lived stratiform conditions. Both the convective and stratiform precipitation components were affected by the topography. Similar flooding events, such as June 2002, have occurred over this region although the 2002 event was colder and precipitation was not associated with substantial convection over southwest Alberta. Copyright © 2016 Her Majesty the Queen in Right of Canada. Hydrological Processes. © John Wiley & Sons, Ltd. 相似文献
68.
In this paper we present a stochastic model for daily average temperature to calculate the temperature indices upon which temperature-based derivatives are written. We propose a seasonal mean and volatility model that describes the daily average temperature behavior using the mean-reverting Ornstein-Uhlenbeck process. We also use higher order continuous-time autoregressive process with lag 3 for modeling the time evolution of the temperatures after removing trend and seasonality. Our model is fitted to 11 years of data recorded, in the period 1 January 2005 to 31 December 2015, Bahir Dar, Ethiopia, obtained from Ethiopia National Meteorological Services Agency. The analytical approximation formulas are used to price heating degree days (HDD) and cooling degree days (CDD) futures. The suggested model is analytically tractable for derivation of explicit prices for CDD and HDD futures and option. The price of the CDD future is calculated, using analytical approximation formulas. Numerical examples are presented to indicate the accuracy of the method. The results show that our model performs better to predict CDD indices. 相似文献
69.
基于秦岭—淮河南北及其周边196个气象站点观测资料,构建实际和动态供暖指数,对中国南北过渡带供暖格局变化进行分析,并探讨冬季北极涛动(AO)异常与供暖效率的响应关系。结果表明:① 固定供暖策略下,1960-2016年秦岭—淮河南北实际供暖能耗偏高,呈现“南多北少,西低东高”的变化特征,且低纬度地区供暖需求下降信号早于高纬度;② 对比区域变暖前后,秦岭—淮河南北冬季供暖能耗1960-1990年和1990-2016年两阶段空间特征,发现“整体南高北低,北部东高西低”的格局并未发生变化,供暖南北波动界线依然维持在秦岭山脉—淮河平原中部;③ AO强弱波动与区域冬季供暖能耗具有明显的时空响应关系,是影响中国南北过渡带供暖格局变化的重要因素。当AO负相位时,除四川盆地和巫山山区之外,秦岭—淮河南北其他区域实际供暖能耗明显下降,特别是淮河平原和长江下游的过渡地带响应尤为明显,未来应该有针对性制定气候适应对策。 相似文献
70.
This paper describes how measurements of the movement of identifiable features at the edge of a turbulent plume can be interpreted to determine the properties of the mean flow and consequently, using plume theory, can be used to make estimates of the fluxes of volume (mass), momentum, and buoyancy in a plume. This means that video recordings of smoke rising from a chimney or buoyant material from a source on the sea bed can be used to make accurate estimates of the source conditions for the plume. At best we can estimate the volume flux and buoyancy flux to within about 5% and 15% of the actual values, respectively. Although this is restricted to the case of a plume rising in a stationary and unstratified environment, we show that the results may be of practical use in other more complex situations. In addition, we demonstrate that large-scale (turbulent) coherent structures at the plume edge form on a scale approximately 40% of the local (mean) plume half-width and travel at almost 60% of the average local (mean) velocity in the plume. 相似文献