全文获取类型
收费全文 | 173篇 |
免费 | 3篇 |
国内免费 | 4篇 |
专业分类
测绘学 | 7篇 |
大气科学 | 22篇 |
地球物理 | 22篇 |
地质学 | 82篇 |
海洋学 | 29篇 |
天文学 | 13篇 |
自然地理 | 5篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 2篇 |
2018年 | 7篇 |
2017年 | 5篇 |
2016年 | 10篇 |
2015年 | 2篇 |
2014年 | 7篇 |
2013年 | 15篇 |
2012年 | 5篇 |
2011年 | 7篇 |
2010年 | 14篇 |
2009年 | 12篇 |
2008年 | 12篇 |
2007年 | 3篇 |
2006年 | 5篇 |
2005年 | 6篇 |
2004年 | 8篇 |
2003年 | 1篇 |
2002年 | 3篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 5篇 |
1997年 | 2篇 |
1994年 | 4篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1990年 | 1篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 4篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有180条查询结果,搜索用时 15 毫秒
31.
A sea-breeze event in south-west Western Australia is simulated using the Regional Atmospheric Modelling System (RAMS) version
6.0. The model is evaluated against high resolution soundings as well as station observations and is shown to reproduce the
qualitative features of the sea breeze well. Sensitivity tests are carried out to investigate the effects of historical land-cover
change and changes in soil moisture on the dynamics of the sea breeze. It is found that land-cover change alone, i.e., a change
from wooded grasslands to bare soil, with no change in soil moisture initialisation, does not significantly alter the overall
structure of the sea breeze but results in higher surface winds due to the reduced vegetation roughness length, which leads
to enhanced surface moisture advection inland. On the other hand, land-cover change in conjunction with increased soil moisture
results in a considerably weaker, shallower, and less penetrative sea breeze, and delays its onset and duration. A sea-breeze
scaling analysis highlights the impact of increasing soil moisture on reducing the sea-breeze volume flux scale. 相似文献
32.
G. Muraleedharan N. Unnikrishnan Nair P. G. Kurup 《Journal of Earth System Science》1999,108(3):149-153
It is well accepted that the parent distribution for individual ocean wave heights follows the Weibull model. However this
model does not simulate significant wave height which is the average of the highest one-third of some ‘n’ (n- varies) wave heights in a wave record. It is now proposed to redefine significant wave height as average of the highest one-third
of a constant number (n-constant, say,n = 100) of consecutive individual wave heights. The Weibull model is suggested for simulating redefined significant wave height
distribution by the method of characteristic function. An empirical support of 100.00% is established by Χ2-test at 0.05 level of significance for 3 sets of data at 0900, 1200 and 1500 hrs at Valiathura, Kerala coast. Parametric
relations have been derived for the redefined significant wave height parameters such as mean, maximum one-third average,
extreme wave heights, return periods of an extreme wave height and the probability of realising an extreme wave height in
a time less than the designated return period. 相似文献
33.
G. Muraleedharan Mourani Sinha A. D. Rao N. Unnikrishnan Nair P. G. Kurup 《Natural Hazards》2009,49(2):165-186
We used field and model wave data to investigate that zero crossing and average wave period distribution follow Gamma distribution.
Since Gamma CDF is an infinite power series, further mathematical treatment is difficult. Hence its shape parameter is approximated
to the nearest integer to arrive at Erlang distribution. An expression is derived from Erlang distribution to estimate various
mean wave periods and significant wave period and validated by relative root mean square (RRMS) error criteria. It is shown
by mathematical logic that the significant wave period distribution follows Erlang (or Gamma) distribution and is validated.
The average of one-third and one-tenth highest wave periods (T
s
) estimated from Erlang distribution are in accordance with the values computed from recorded buoy and numerical coastal wave
model wave period data. The predicted T
s
values from coastal wave model wave period data underestimates the values from buoy wave period data. 相似文献
34.
S. Suresh Babu V. Sreekanth Vijayakumar S Nair S.K. Satheesh K. Krishna Moorthy 《Journal of Atmospheric and Solar》2010,72(11-12):876-882
Altitude profile of aerosol Single Scattering Albedo (SSA), derived from simultaneous in-situ airborne measurements of the coefficients of aerosol absorption and scattering off the west coast of India over the Arabian Sea (AS), during January 2009 is presented. While both the absorption and scattering coefficients decreased with altitude, their vertical structure differed significantly. Consequently, the derived SSA, with a surface value of 0.94, decreased with altitude, illustrating increasing relative dominance of aerosol absorption at higher altitudes. Altitude profile of SSA, when examined in conjunction with that of hemispheric backscatter fraction, revealed that the continental influence on the aerosol properties was higher at higher altitude, rather than the effect of marine environment. During an east–west transect across the peninsular India at an altitude of ~2500 m (free troposphere), it was found that the aerosol scattering coefficients remained nearly the same over both east and west coasts. 相似文献
35.
The south-west of Western Australia has experienced significant land-cover change as well as a decline in rainfall. Given
that most precipitation in the region results from frontal passages, the impact of land-cover change on the dynamics of cold
fronts is explored using the Regional Atmospheric Modeling System version 6.0. Frontal simulations are evaluated against high
resolution atmospheric soundings, station observations, and gridded rainfall analyses and shown to reproduce the qualitative
features of cold fronts. Land-cover change results in a decrease in total frontal precipitation through a decrease in boundary-layer
turbulent kinetic energy and vertically integrated moisture convergence, and an increase in wind speed within the lower boundary
layer. Such processes contribute to reduced convective rainfall under current vegetation cover. 相似文献
36.
C. M. Sykes I. W. A. Browne N. J. Jackson D. R. Marlow S. Nair P. N. Wilkinson R. D. Blandford J. Cohen C. D. Fassnacht D. Hogg T. J. Pearson A. C. S. Readhead D. S. Womble S. T. Myers A. G. de Bruyn M. Bremer G. K. Miley & R. T. Schilizzi 《Monthly notices of the Royal Astronomical Society》1998,301(2):310-314
We report the discovery of the most complex arcsec-scale radio gravitational lens system yet known. B1933+503 was found during the course of the CLASS survey and MERLIN and VLA radio maps reveal up to 10 components. Four of these are compact and have flat spectra; the rest are more extended and have steep spectra. The background lensed object appears to consist of a flat-spectrum core (quadruply imaged) and two compact 'lobes' symmetrically disposed relative to the core. One of the lobes is quadruply imaged while the other is doubly imaged. An HST observation of the system with the WFPC2 shows a galaxy with an axial ratio of 0.5, but none of the images of the background object is detected. A redshift of 0.755 has been measured for the lens galaxy. 相似文献
37.
R. Jyothibabu N.V. Madhu P.A. Maheswaran K.V. Jayalakshmy K.K.C. Nair C.T. Achuthankutty 《Continental Shelf Research》2008
Stratification (throughout the year) and low solar radiation (during monsoon periods) have caused low chlorophyll a and primary production (seasonal average 13–18 mg m−2 and 242–265 mg C m−2 d−1, respectively) in the western Bay of Bengal (BoB). The microzooplankton (MZP) community of BoB was numerically dominated by heterotrophic dinoflagellates (HDS) followed by ciliates (CTS). The highest MZP abundance (average 665±226×104 m−2), biomass (average 260±145 mg C m−2) and species diversity (Shannon weaver index 2.8±0.42 for CTS and 2.6±0.35 for HDS) have occurred during the spring intermonsoon (SIM). This might be due to high abundance of smaller phytoplankton in the western BoB during SIM as a consequence of intense stratification and nitrate limitation (nitracline at 60 m depth). The strong stratification during SIM was biologically evidenced by intense blooms of Trichodesmium erythraeum and frequent Synechococcus–HDS associations. The high abundance of smaller phytoplankton favors microbial food webs where photosynthetic carbon is channeled to higher trophic levels through MZP. This causes less efficient transfer of primary organic carbon to higher trophic levels than through the traditional food web. The microbial food web dominant in the western BoB during SIM might be responsible for the lowest mesozooplankton biomass observed (average 223 mg C m−2). The long residence time of the organic carbon in the surface waters due to the active herbivorous pathways of the microbial food web could be a causative factor for the low vertical flux of biogenic carbon during SIM. 相似文献
38.
Rajani Nair Asha A. Juwarkar Tushar Wanjari S. K. Singh T. Chakrabarti 《Climatic change》2011,106(4):609-619
The micrometeorological technique of eddy covariance is a powerful tool for characterizing the carbon (C) budget of terrestrial
ecosystems. Eddy covariance method was used for estimating Net Ecosystem Exchange (NEE) of carbon dioxide between atmosphere
and revegetated manganese mine spoil dump at Gumgaon, India. In this paper, we analyzed the diel CO2 flux pattern and its response to various physical environmental conditions. The carbon balance of terrestrial ecosystems
is particularly sensitive to climatic changes. Study of diel pattern of CO2 flux showed that carbon uptake was dependent on sunlight. Effect of temperature and latent heat on the CO2 flux showed that rate of CO2 uptake increased proportionally, but later declined due to various factors like stomatal response, high evaporative demand,
circadian rhythm and/or a combination of all three. Net ecosystem production of revegetated land was found to be 28.196 KgC/ha/day
whereas average net carbon release by the ecosystem, through respiration was observed to be 5.433 KgC/ha/day. Thus, quantifying
net carbon (C) storage in degraded land is a necessary step in the validation of carbon sequestration estimates and in assessing
the possible role of these ecosystems in offsetting adverse impacts of fossil fuel emissions. 相似文献
39.
The abundance of baroduric bacteria from nine sediment cores (0–10 cm below sea floor) was examined for their response to simulated benthic disturbance in the Central Indian basin (CIB). While the total counts of bacteria decreased from 109 to 106 g?1 dry wt sediment, the average retrievable counts (CFU-colony forming units) improved by two orders of magnitude, i.e., from 102 104 g?1 dry wt sediment. The baroduric retrievable forms were dominated by Acinetobacter and Moraxella sp before the disturbance. After the disturbance the generic diversity was represented by Staphylococcus sp, Enterobacter sp, Micrococcus sp, Coryneforms sp, and Pseudomonas sp in addition to Acinetobacter. These observations were corroborated by changes in enzymatic activities of the retrievable bacteria, which could lead to changes in the biochemical characteristics of the sediment. Thus the simulated disturbance brought about an increase in culturable abundance, taxonomic and functional diversity of deep-sea sediment of the CIB. 相似文献
40.
Mass loading and chemical composition of atmospheric aerosols over the Arabian Sea during the pre-monsoon months of April and May have been studied as a part of the Integrated Campaign for Aerosols, gases and Radiation Budget (ICARB). These investigations show large spatial variabilities in total aerosol mass loading as well as that of individual chemical species. The mass loading is found to vary between 3.5 and 69.2 μg m?3, with higher loadings near the eastern and northern parts of Arabian Sea, which decreases steadily to reach its minimum value in the mid Arabian Sea. The decrease in mass loading from the coast of India towards west is estimated to have a linear gradient of 1.53 μg m?3/° longitude and an e?1 scale distance of ~2300 km. SO 4 2? , Cl? and Na+ are found to be the major ionic species present. Apart from these, other dominating watersoluble components of aerosols are NO 3 ? (17%) and Ca2+ (6%). Over the marine environment of Arabian Sea, the non-sea-salt component dominates accounting to ~76% of the total aerosol mass. The spatial variations of the various ions are examined in the light of prevailing meteorological conditions and airmass back trajectories. 相似文献