全文获取类型
| 收费全文 | 90篇 |
| 免费 | 2篇 |
专业分类
| 测绘学 | 1篇 |
| 大气科学 | 7篇 |
| 地球物理 | 14篇 |
| 地质学 | 18篇 |
| 海洋学 | 34篇 |
| 天文学 | 13篇 |
| 综合类 | 2篇 |
| 自然地理 | 3篇 |
出版年
| 2018年 | 1篇 |
| 2017年 | 1篇 |
| 2016年 | 2篇 |
| 2013年 | 3篇 |
| 2012年 | 1篇 |
| 2011年 | 2篇 |
| 2010年 | 3篇 |
| 2009年 | 3篇 |
| 2008年 | 4篇 |
| 2007年 | 4篇 |
| 2006年 | 3篇 |
| 2005年 | 4篇 |
| 2004年 | 5篇 |
| 2003年 | 2篇 |
| 2002年 | 2篇 |
| 2001年 | 2篇 |
| 2000年 | 1篇 |
| 1999年 | 3篇 |
| 1998年 | 1篇 |
| 1997年 | 1篇 |
| 1996年 | 6篇 |
| 1995年 | 2篇 |
| 1994年 | 1篇 |
| 1993年 | 5篇 |
| 1992年 | 3篇 |
| 1990年 | 2篇 |
| 1988年 | 2篇 |
| 1985年 | 2篇 |
| 1984年 | 2篇 |
| 1983年 | 3篇 |
| 1982年 | 2篇 |
| 1981年 | 2篇 |
| 1980年 | 1篇 |
| 1979年 | 2篇 |
| 1977年 | 4篇 |
| 1974年 | 3篇 |
| 1971年 | 1篇 |
| 1969年 | 1篇 |
排序方式： 共有92条查询结果，搜索用时 247 毫秒
71.
Yoshimasa Toyota Shiro Okabe Satoru Kanamori Yasushi Kitano 《Journal of Oceanography》1983,38(6):357-361
A simple and rapid coprecipitation method for the determination of several trace metals in seawater is presented. These metals are coprecipitated with lanthanum hydroxide, the precipitate is dissolved, and then the metals are determined by atomic absorption spectrometry. Lanthanum hydroxide was chosen as a coprecipitant for the following reasons, (a) lanthanum hydroxide has a sufficiently low solubility and forms an easily filterable flocculate at about 80C, and (b) lanthanum has an absorption wavelength that is sufficiently separated from those of the other elements to be analysed, i.e., Mn, Fe, Ni, Cu and Zn. Experimental results show that these metals are coprecipitated by the present method with excellent recoveries. 相似文献
72.
The behavior of transition metals (Co, Ni, Cu and Zn) on precipitation of manganese oxides from seawater pumped up from a
well at the site of the Marine Science Museum, Tokai University, and collected from several tanks along the water supply system
to an aquarium was investigated. The distribution coefficients of cobalt and nickel between manganese oxides and seawater
were different at different sampling points along the water supply system. At sampling points with high rates of manganese
oxide precipitation, the distribution coefficients were about one order of magnitude smaller than those at the points with
low precipitation rates, while there were no remarkable differences in the distribution coefficients of copper and zinc among
the sampling points. The distribution coefficients of minor transition metals, with the exception of copper, observed at the
points with low precipitation rates were comparable to those measured experimentally using manganese dioxides. 相似文献
73.
74.
Eddy activities of the surface layer in the western North Pacific detected by satellite altimeter and radiometer 总被引：5，自引：0，他引：5
Geosat radar altimeter data during the first year (from November 1986 to November 1987) of its Exact Repeat Mission are analyzed to estimate the eddy kinetic energy and propagation characteristics of anomalies of sea surface dynamic topography (SSDT) for the western North Pacific. SSDT anomalies are compared with anomalies of sea surface temperature (SST) derived from NOAA satellite radiometer data. The eddy kinetic energy (K
e
) is large in the Kuroshio stationary meander region and Kuroshio Extension region. In the downstream region of the Kuroshio Extension,K
e
is especially large on the upstream and downstream sides of prominent bathymetric features. In the interior region of the subtropical gyre is found a zonal tongue of largeK
e
at around 20–20°N. Westward propagation is dominant in the SSDT and SST anomaly field at mid-latitudes. Longitude-time lag correlation diagrams reveal the coincidence of SSDT and SST anomalies statistically, which fact suggests the baroclinic nature of the anomalies. Zonal phase speeds of SSDT anomalies are approximately equal to the theoretical speeds of baroclinic first-mode long Rossby waves, but the meridional variation of observed phase speeds does not follow the simple theoretical variation of decreasing speeds monotonously with increasing latitudes. 相似文献
75.
The interaction of chromium (III) with humic substances obtained from pond sediment was experimentally studied using electrophoresis combined with ultrafiltration. The results show that within the neutral pH range chromium (III) in the presence of humic substances and some organic acids forms uncharged and/or negatively charged organic complexes of various molecular weights. A part of the chromium(III)-humic or -fulvic acid complexes having a negative charge was of lower molecular weight. Chromium (III) spiked in fresh water exists as various soluble anionic and/or uncharged species, and the molecular weights of these anionic complexes correspond to those of chromium(III)-humic and -fulvic complexes. These complexes may remain as stable dissolved forms for 10 days. The significance of the occurrence of chromium(III)-organic complexes in natural water in the geochemical cycle of chromium in the hydrosphere is discussed. 相似文献
76.
The critical accretion flow of gas onto compact stars with mass of 0.6M
is investigated by numerical integrations of the time-dependent hydrodynamic equations in the sphericallysymmetric and optically thick case. For the compact stars surrounded by such a dense cloud of gas, the radiation pressure force decelerates the infall gas significantly and free fall regime of the gas is not at all attained. This results in incident low velocities at the standing shock front close to the stellar surface, low temperatures of the gas around the compact stars, and no X-ray in white dwarfs but soft X-rays in neutron stars, respectively. Some applications of the results to the X-ray sources are discussed. 相似文献
77.
Similarity solution for the interaction of stellar wind with surrounding interstellar medium is obtained on the base of momentum conservation. The conversion efficiency of kinetic energy of stellar wind into the kinetic energy of expanding shell is derived. The results are compared with the observations on the ring nebulae associated with the Wolf-Rayet star and it is shown that the observed values of energy conversion are in good agreement with the momentum conserving model. 相似文献
78.
A set of simultaneous long-term, deep current measurements was taken using a moored array in the mid-ocean of the western North Pacific near 30°N, 146°E. Five current meters at three stations provided good quality records over 84 days. Low-frequency current fluctuations with meridional dominance are clearly seen in the deep layer records. They are consistent with signals of a mesoscale current fluctuation which has a period of about 100 days, an east-west wave length of about 200 km, and a westward phase propagation with a speed of about 2 cm sec–1. Bottom intensification of the east component of low-frequency current fluctuations is also observed. 相似文献
79.
Surface velocities determined from trajectory of a drifting buoy from March through November 1987 are compared with surface geostrophic velocities determined from sea surface dynamic topography (SSDT) obtained from altimetry data with the aid of long-term hydrographic observation data. In general, these velocities show similar temporal variations in both zonal and meridional components, except in a period when obvious error is found in the altimetric SSDT field. When the buoy was trapped by several mid-ocean meso-scale eddies, the comparison is especially good. Systematic discrepancy is found, however, when the buoy was in the Kuroshio region, because of using both temporally and spatially smoothed mean SSDT estimated from hydrographic data; instead, surface geostrophic velocities determined from the altimetric SSDT referred to the improved geoid model result in better comparison. 相似文献
80.
