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排序方式: 共有271条查询结果,搜索用时 15 毫秒
81.
Takahito Kataoka Tomoki Tozuka Swadhin Behera Toshio Yamagata 《Climate Dynamics》2014,43(5-6):1463-1482
Using both observational and reanalysis data, evolution processes of a regional climate phenomenon off Western Australia named recently “Ningaloo Niño (Niña)” are studied in detail. It is also shown that the Ningaloo Niño (Niña) has significant impacts on the precipitation over Australia. The Ningaloo Niño (Niña), which is associated with positive (negative) sea surface temperature (SST) anomalies and atmospheric anomalies off the western coast of Australia, peaks during austral summer and is classified into two types based on the difference in the evolution process. The first type called a locally amplified mode develops through an intrinsic unstable air–sea interaction off the western coast of Australia; an anomalous cyclone (anticyclone) generated by positive (negative) SST anomalies forces northerly (southerly) alongshore wind anomalies, which induce coastal downwelling (upwelling) anomalies, and enhance the positive (negative) SST anomalies further. The second type called a non-locally amplified mode is associated with coastally trapped waves originating in either the western tropical Pacific, mostly related to El Niño/Southern Oscillation, or the northern coast of Australia. Positive (negative) SST anomalies in both modes are associated with an anomalous low (high) off the western coast of Australia. The sea level pressure (SLP) anomalies in the locally amplified mode are regionally confined with a cell-like pattern and produce a sharp offshore pressure gradient along the western coast of Australia, whereas those in the non-locally amplified mode tend to show a zonally elongated pattern. The difference is found to be related to conditions of the continental SLP modulated by the Australian summer monsoon and/or the Southern Annular Mode. 相似文献
82.
Hengyi Weng Guoxiong Wu Yimin Liu Swadhin K. Behera Toshio Yamagata 《Climate Dynamics》2011,36(3-4):769-782
Possible influences of three coupled ocean–atmosphere phenomena in the Indo-Pacific Oceans, El Niño, El Niño Modoki and the Indian Ocean Dipole (IOD), on summer climate in China are studied based on data analysis for the summers of 1951–2007. Partial correlation/regression analysis is used to find the influence paths through the related anomalous mid- and low-level tropospheric circulations over the oceanic region and East Eurasia, including the western North Pacific summer monsoon (WNPSM). Among the three phenomena, El Niño Modoki has the strongest relationship with the WNPSM. When two or three phenomena coexist with either positive or negative phase, the influences exerted by one phenomenon on summer climate in different regions of China may be enhanced or weakened by other phenomena. In 1994 when both El Niño Modoki and IOD are prominent without El Niño, a strong WNPSM is associated with severe flooding in southern China and severe drought in the Yangtze River Valley (YRV). The 500 hPa high systems over China are responsible for heat waves in most parts of China. In 1983 when a strong negative phase of El Niño Modoki is accompanied by moderate El Niño and IOD, a weak WNPSM is associated with severe flooding in the YRV and severe drought in southern China. The 500 hPa low systems over China are responsible for the cold summer in the YRV and northeastern China. For rainfall, the influence path seems largely through the low-level tropospheric circulations including the WNPSM. For temperature, the influence path seems largely through the mid-level tropospheric circulations over East Eurasia/western North Pacific Ocean. 相似文献
83.
Toshio Tsuchiya 《Astrophysics and Space Science》2003,284(2):515-518
Dynamical evolution of galactic disks driven by interaction with satellite galaxies, particularly the problem of the disk
warping and thickening is studied numerically. One of the main purpose of the study is to resolve the long standing problem
of the origin of the disk warping. A possible cause of the warp is interaction with a satellite galaxy. In the case of the
Milky Way, the LMC has been considered as the candidate. Some linear analysis have already given a positive result, but one
had to wait for a fully self-consistent simulation as a proof. I have accomplished the numerical simulations with a million
particles, by introducing a hybrid algorithm, SCF-TREE. Those simulations give us quantitative estimates for the Milky Way
system. We have found an example in which large warp amplitudes are developed. We also found that the warp amplitudes depend
on the halo distribution. Among our three models, the most massive and spherical halo is preferable for the observable warp
excitation.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
84.
The horizontal electric field has been measured with balloons over the Pacific Ocean near the Sanriku Coast in Japan. By comparing the electric-field data obtained during magnetically disturbed periods, 16–17 October 1973, 6–7 October 1975 and 3–4 October 1977, with IMF Bz, auroral zone AU and AL, equatorial Dst and , mid-latitude magnetic fields (H, D, Z at Kakioka), and the ionospheric electron density (?0F2 at Kokubunji), it is found that the observed electric fields of about 9 mVm?1 made the clockwise rotation during the growth and recovery stages of the magnetospheric substorms. Relations between high and middle latitude ionospheres and between the magnetosphere and the ionosphere are discussed in relation to the origin and propagation of these electric fields. 相似文献
85.
86.
Toshio Ogawa 《Planetary and Space Science》1976,24(8):801-802
A method is proposed for making measurements near the ground of a large scale electric field mapped from ionospheric and magnetospheric sources. 相似文献
87.
88.
Shinya Shimokawa Tomokazu Murakami Satoshi Iizuka Jun Yoshino Takashi Yasuda 《Natural Hazards》2014,74(3):2037-2052
We developed the new typhoon bogussing scheme to obtain the possible maximum typhoon approaching any region under any climatic conditions by using a potential vorticity inversion method. Numerical simulations with the new typhoon bogussing scheme are conducted for assessment of storm surges by possible maximum typhoons under the present-day and global warming climatic conditions in Ise and Tokyo Bays in Japan. The results suggest that the storm tide higher than the maximum storm tide in recorded history can occur in Ise and Tokyo Bays even for the present-day climate and the storm tide higher than the design sea level can cause severe damage to Nagoya and Tokyo megacities, in particular, airport facilities in Ise Bay for the global warming climate. These results suggest that the new typhoon bogussing scheme we developed is useful for assessment of impacts of storm surge by the possible maximum typhoons. 相似文献
89.
90.
Brian Luzum Nicole Capitaine Agn??s Fienga William Folkner Toshio Fukushima James Hilton Catherine Hohenkerk George Krasinsky G??rard Petit Elena Pitjeva Michael Soffel Patrick Wallace 《Celestial Mechanics and Dynamical Astronomy》2011,110(4):293-304
In the 2006?C2009 triennium, the International Astronomical Union (IAU) Working Group on Numerical Standards for Fundamental Astronomy determined a list of Current Best Estimates (CBEs). The IAU 2009 Resolution B2 adopted these CBEs as the IAU (2009) System of Astronomical Constants. Additional work continues to define the process of updating the CBEs and creating a standard electronic document. 相似文献