首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   446篇
  免费   129篇
  国内免费   90篇
测绘学   7篇
大气科学   177篇
地球物理   177篇
地质学   176篇
海洋学   63篇
天文学   9篇
综合类   21篇
自然地理   35篇
  2024年   1篇
  2023年   7篇
  2022年   11篇
  2021年   9篇
  2020年   11篇
  2019年   16篇
  2018年   15篇
  2017年   17篇
  2016年   16篇
  2015年   18篇
  2014年   27篇
  2013年   26篇
  2012年   14篇
  2011年   29篇
  2010年   17篇
  2009年   39篇
  2008年   32篇
  2007年   31篇
  2006年   40篇
  2005年   27篇
  2004年   21篇
  2003年   20篇
  2002年   35篇
  2001年   22篇
  2000年   23篇
  1999年   22篇
  1998年   12篇
  1997年   12篇
  1996年   8篇
  1995年   11篇
  1994年   7篇
  1993年   17篇
  1992年   3篇
  1991年   11篇
  1990年   9篇
  1989年   5篇
  1988年   6篇
  1987年   2篇
  1985年   1篇
  1983年   1篇
  1982年   1篇
  1980年   1篇
  1978年   12篇
排序方式: 共有665条查询结果,搜索用时 15 毫秒
41.
云南地热资源及其开发前景   总被引:1,自引:0,他引:1  
云南地热异常多且显著。滇西高温水热活动区是藏滇水热带的南延,滇东断陷盆地中低温水热活动区的形成得益于独特的地质结构,滇西、滇南花岗岩地热系统则主要吸收地层中K^40同位索放射热而成。开发前景极为广阔。  相似文献   
42.
江西省大地热流与铀矿关系的初步研究   总被引:3,自引:0,他引:3  
本文根据江西省大地构造、铀矿分布和大地热流实测资料,证明大地热流异常和铀矿均受深大断裂和深部构造变异带的控制,铀矿化能在一定程度上引起热流异常,并据此初步探讨了根据大地热流异常寻找铀矿床的可能性。  相似文献   
43.
The low-temperature heat capacity (C p) of Si-wadeite (K2Si4O9) synthesized with a piston cylinder device was measured over the range of 5–303 K using the heat capacity option of a physical properties measurement system. The entropy of Si-wadeite at standard temperature and pressure calculated from the measured heat capacity data is 253.8 ± 0.6 J mol−1 K−1, which is considerably larger than some of the previous estimated values. The calculated phase transition boundaries in the system K2O–Al2O3–SiO2 are generally consistent with previous experimental results. Together with our calculated phase boundaries, seven multi-anvil experiments at 1,400 K and 6.0–7.7 GPa suggest that no equilibrium stability field of kalsilite + coesite intervenes between the stability field of sanidine and that of coesite + kyanite + Si-wadeite, in contrast to previous predictions. First-order approximations were undertaken to calculate the phase diagram in the system K2Si4O9 at lower pressure and temperature. Large discrepancies were shown between the calculated diagram compared with previously published versions, suggesting that further experimental or/and calorimetric work is needed to better constrain the low-pressure phase relations of the K2Si4O9 polymorphs. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.  相似文献   
44.
断裂构造能够引起重力场的异常分布,温泉热源的形成和空间展布主要受深大断裂、基底构造等地质因素控制。基于这一思路,根据该区重力资料,结合地质及其它地球物理资料对深部地质结构做了一些探讨。对重力资料进行了一些处理,挖掘深部地质信息,根据所得信息推断出了一些基底断裂,有一些是本次重力结果新发现的断裂。此外,还证实了前人已圈定的断裂构造,这些构造在控热、导热作用方面起着重要作用,深大断裂、基底构造它们交汇部位附近是寻找温泉热源的有利地区。  相似文献   
45.
A multi-anvil device was used to synthesize 24 mg of pure γ-Fe2SiO4 crystals at 8.5 GPa and 1,273 K. The low-temperature heat capacity (C p) of γ-Fe2SiO4 was measured between 5 and 303 K using the heat capacity option of a physical properties measurement system. The measured heat capacity data show a broad λ-transition at 11.8 K. The difference in the C p between fayalite and γ-Fe2SiO4 is reduced as the temperature increases in the range of 50–300 K. The gap in C p data between 300 and 350 K of γ-Fe2SiO4 is an impediment to calculation of a precise C p equation above 298 K that can be used for phase equilibrium calculations at high temperatures and high pressures. The C p and entropy of γ-Fe2SiO4 at standard temperature and pressure (S°298) are 131.1 ± 0.6 and 140.2 ± 0.4 J mol−1 K−1, respectively. The Gibbs free energy at standard pressure and temperature (Δ f,298) is calculated to be −1,369.3 ± 2.7 J mol−1 based on the new entropy data. The phase boundary for the fayalite–γ-Fe2SiO4 transition at 298 K based on current thermodynamic data is located at 2.4 ± 0.6 GPa with a slope of 25.4 bars/K, consistent with extrapolated results of previous experimental studies.  相似文献   
46.
西太平洋赤道海域的热量平衡   总被引:1,自引:0,他引:1  
本文利用1986年11月中国科学院实验3号考察船在西太平洋赤道海域(0°~5°N,130°~150°E)考察所获得的29天辐射资料和同期取得的温、压、湿、风和探空等资料,计算了这一海域11月份的热量平衡各量值和整层气柱的加热量。结果表明:该海域是一个强热源区,其上空大气也是一个强热源区。  相似文献   
47.
黄河流域旱涝年地面热量收支变化特征   总被引:1,自引:0,他引:1       下载免费PDF全文
根据北京、郑州3年热量平衡观测资料,建立波文(Bowen)比计算模式。并用此模式及辐射计算式等估计黄河流域8年5-8月地面月辐射收支、蒸发耗热、湍流热交换量和土壤热交换量,并比较分析旱涝年它们的差异以及随旱涝(用降水距平表示)的变化。  相似文献   
48.
A model for the urban canyon is formulated for meteorologicalconditions of weak winds at night time. Thermal radiation, conductivity and convection are simulated by means of the Monte Carlo method. These are the main physical processesof energy transfer that give rise to the characteristic temperaturedistribution in these systems. The model has been satisfactory tested under ideal conditions for which analytical solutions exist.The predictions of the model under morerealistic conditions accurately reproduce the observationalresults. A strong temperature gradient across streets, with the canyon corners up to 4 °C warmer than the canyon centre, is found for the deepest canyons. This theoretical predictionhas been successfully verified with measurementstaken in a number of streets of the city of Granada in Spain.  相似文献   
49.
The responses of sea surface temperature (SST) in the western equatorial Pacific warm pool to the west erly wind bursts (WWBs) play an important role in the relationship between WWB and ENSO. By using da ta collected from eight buoys of TOGA (Tropical Ocean-Global Atmosphere)-COARE (Coupled Ocean-Atmosphere Response Experiment), the heat balances of the upper ocean in the western equatorial Pacific around 0°. 156°E during two WWB events were calculated according to Stevenson and Niiler's (1983) method. In both events, SST increased before and after the WWBs, while decreased within the WWBs. The SST amplitudes approximated to l℃. Although sometimes the horizontal heat advections may become the biggest term in the heat balance, the variation of SST was dominated by the surface heat flux. On the other aspect, some different features of the two events are also revealed. The two cases have different variation of mixed layer depth. The depth of mixed layer is almost double in the first case (35 m to 70 m), which is caused by Ekman convergence, while only 10m increments due to entrainment in the second one. There are also differences in the currents structure. The different variations of thermal and currents struc ture in the mixing layers accounted for the different variation of the heat balance during the two events, es pecially the advection and residue terms. The seasonal variation of SST in this area is also investigated sim ply. The first WWB event happened just during the seasonal transition. So we considered that it is a normal season transition rather than a so-called anomaly. That also suggested that the seasonal distinction of the WWB is worthy of more attention in the researches of its relationship to ENSO.  相似文献   
50.
The transfer processes within and above a simulated urban street canyon were investigated in a generic manner. Computational fluid dynamics (CFD) was used to aid understanding and to produce some simple operational parameterisations. In this study we addressed specifically the commonly met situation where buoyancy effects arising from elevated surface temperatures are not important, i.e. when mechanical forces outweigh buoyancy forces. In a geophysical context this requires that some suitably defined Richardson number is small. From an engineering perspective this is interpreted as the important case when heat transfer within and above urban street canyons is by forced convection. Surprisingly, this particular scenario (for which the heat transfer coefficient between buildings and the flow is largest), has been less well studied than the situation where buoyancy effects are important. The CFD technique was compared against wind-tunnel experiments to provide model evaluation. The height-to-width ratio of the canyon was varied through the range 0.5–5 and the flow was normal to the canyon axis. By setting the canyon’s facets to have the same or different temperatures or to have a partial temperature distribution, simulations were carried out to investigate: (a) the influence of geometry on the flow and mixing within the canyon and (b) the exchange processes within the canyon and across the canyon top interface. Results showed that the vortex-type circulation and turbulence developed within the canyon produced a temperature distribution that was, essentially, spatially uniform (apart from a relatively thin near-wall thermal boundary layer) This allowed the temperatures within the street canyon to be specified by just one value T can , the canyon temperature. The variation of T can with wind speed, surface temperatures and geometry was extensively studied. Finally, the exchange velocity u E across the interface between the canyon and the flow above was calculated based on a heat flux balance within the canyon and between the canyon and the flow above. Results showed that u E was approximately 1% of a characteristic wind velocity above the street canyon. The problem of radiative exchange is not addressed but it can, of course, be introduced analytically, or computationally, when necessary.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号