全文获取类型
收费全文 | 137篇 |
免费 | 6篇 |
国内免费 | 2篇 |
专业分类
大气科学 | 4篇 |
地球物理 | 42篇 |
地质学 | 33篇 |
海洋学 | 24篇 |
天文学 | 29篇 |
综合类 | 2篇 |
自然地理 | 11篇 |
出版年
2021年 | 1篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 8篇 |
2015年 | 2篇 |
2014年 | 5篇 |
2013年 | 4篇 |
2012年 | 1篇 |
2011年 | 7篇 |
2010年 | 3篇 |
2009年 | 3篇 |
2008年 | 10篇 |
2007年 | 5篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2004年 | 3篇 |
2003年 | 5篇 |
2002年 | 9篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1992年 | 1篇 |
1991年 | 3篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1983年 | 7篇 |
1982年 | 3篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有145条查询结果,搜索用时 31 毫秒
101.
Indialite (hexagonal cordierite) has been found in a cordierite vein of polymetamorphosed pelitic rock, a member of the Unazuki
schists in Hida terrane, central Japan. Most of the indialite grains show intergrowth textures with cordierite of orthorhombic
symmetry. This is the second identification of indialite since the first one from a fused sediment in India.
The intergrowth texture was formed by a nucleation-growth process accompanied with the first order transition from the hexagonal
to the orthorhombic form. Characteristic pseudo-twin relation exists among the orthorhombic phases. Chemical compositions
of both hexagonal and orthorhombic forms in the intergrowth have been deter-mined by analytical electron microscopy. The difference
in Fe/(Mg+Fe) at the interfaces between the two forms indicates the existence of a transition loop in the (Mg, Fe)-cordierite.
The transition of the present specimens is estimated to have initiated at about 700° C. A possible phase diagram of (Mg, Fe)-cordierite
has been proposed, based on the result of this investigation. 相似文献
102.
Yoshinobu Tsuji Hideo Matsutomi Fumihiko Imamura Minoru Takeo Yoshiaki Kawata Masafumi Matsuyama Tomoyuki Takahashi Sunarjo Prih Harjadi 《Pure and Applied Geophysics》1995,144(3-4):481-524
A field survey of the 1992 Flores Island earthquake tsunami was conducted during December 29, 1992 to January 5, 1993 along the north coast of the eastern part of Flores Island. We visited over 40 villages, measured tsunami heights, and interviewed the inhabitants. It was clarified that the first wave attacked the coast within five minutes at most of the surveyed villages. The crust was uplifted west of the Cape of Batumanuk, and subsided east of it. In the residential area of Wuring, which is located on a sand spit with ground height of 2 meters, most wooden houses built on stilts collapsed and 87 people were killed even though the tsunami height reached only 3.2 meters. In the two villages on Babi Island, the tsunami swept away all wooden houses and killed 263 of 1,093 inhabitants. Tsunami height at Riang-Kroko village on the northeastern end of Flores Island reached 26.2 meters and 137 of the 406 inhabitants were killed by the tsumani. Evidence of landslides was detected at a few points on the coast of Hading Bay, and the huge tsunami was probably formed by earthquake-induced landslides. The relationship between tsunami height and mortality was checked for seven villages. The efficiencies of trees arranged in front of coastal villages, and coral reefs in dissipating the tsunami energy are discussed. 相似文献
103.
Masahide Wakita Makio C. Honda Kazuhiko Matsumoto Tetsuichi Fujiki Hajime Kawakami Sayaka Yasunaka Yoshikazu Sasai Chiho Sukigara Mario Uchimiya Minoru Kitamura Toru Kobari Yoshihisa Mino Akira Nagano Shuichi Watanabe Toshiro Saino 《Journal of Oceanography》2016,72(5):665-685
The annual flux of biologically produced organic carbon from surface waters is equivalent to annual net community production (NCP) at a steady state and equals the export of particulate and dissolved organic carbon (POC and DOC, respectively) to the ocean interior. NCP was estimated from carbon budgets of salinity-normalized dissolved inorganic carbon (nDIC) inventories at two time-series stations in the western subarctic (K2) and subtropical (S1) North Pacific Ocean. By using quasi-monthly biogeochemical observations from 2004 to 2013, monthly mean nDIC inventories were integrated from the surface to the annual maximum mixed layer depth and corrected for changes due to net air–sea CO2 exchange, net CaCO3 production, vertical diffusion from the upper thermocline, and horizontal advection. The annual organic carbon flux at K2 (1.49 ± 0.42 mol m?2 year?1) was lower than S1 (2.81 ± 0.53 mol m?2 year?1) (p < 0.001 based on t test). These fluxes consist of three components: vertically exported POC fluxes (K2: 1.43 mol m?2 year?1; S1: 2.49 mol m?2 year?1), vertical diffusive DOC fluxes (K2: 0.03 mol m?2 year?1; S1: 0.25 mol m?2 year?1), and suspended POC fluxes (K2: 0.03 mol m?2 year?1; S1: 0.07 mol m?2 year?1). The estimated POC export flux at K2 was comparable to the sum of the POC flux observed with drifting sediment traps and active carbon flux exported by migrating zooplankton. The export fluxes at both stations were higher than those reported at other time-series sites (ALOHA, the Bermuda Atlantic Time-series Study, and Ocean Station Papa). 相似文献
104.
105.
106.
Yoshinobu Wakata 《Journal of Oceanography》2007,63(3):483-490
The sea surface height anomaly in the Pacific equatorial area was separated into equatorial modes using satellite altimeter
data. The power-spectral density (PSD) was obtained for the east-west wavenumber and frequency for each separated mode. The
PSD distribution was compared with the theoretical dispersion curve for the equatorial modes derived by Matsuno (1966). The
first Rossby modes have a high-density distribution that is slightly lower than the theoretical dispersion curve, but the
Kelvin mode and the higher Rossby modes have high-density distribution that almost matches each dispersion curve. Results
of analyses of satellite observational data show that wave motion near the equator mainly shows characteristics of equatorial
waves, especially for a intraseasonal time scale. 相似文献
107.
Mansour Ioualalen Yoshinobu Wakata Yoshikazu Kawahara Yves Gouriou David Varillon 《Journal of Oceanography》2003,59(1):105-111
The sea surface salinity (SSS) derived from a network developed at Institut de Recherche pour le Développement (IRD/Nouméa)
has been analyzed during the period 1995–1998 in the tropical western Pacific. The measurements were made with thermosalinographs
installed on merchant ships selected for their regularity and routes. The western tropical Pacific was sampled mainly along
three regular routes across the equator leading to an average of a one month frequency. We analyze here how such a network
can be efficient in monitoring the SSS at time scales longer than one month. For this purpose we have used results derived
from the Princeton Ocean Model (POM) which is forced by the surface flux of National Centers for Environmental Prediction
(NCEP) reanalysis data. The interannual variability of the simulated SSS exhibits very similar features to (sub-sampled) observations
despite its being weakly damped to a climatology in order to avoid biases. Even smaller time scale phenomena can be simulated,
like the erosion/reconstruction of the region composed of low density waters lying within the Pacific warm pool. The agreement
between the observational data and the simulations indicate that the network sampling is sufficient to monitor the SSS variability
of the western tropical Pacific from three-month to interannual time scales.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
108.
Yoshinobu Wakata 《Journal of Oceanography》2001,57(6):693-707
The Kelvin wave excited by an intraseasonal wind forcing with a 40-day period over the western Pacific Ocean was simulated
using an ocean general circulation model, and was investigated by the use of spectral analysis. The amplitude of the temperature
has two peaks north and south of the equator at the depth of the thermocline, and the amplitude of zonal velocity also has
two peaks on the equator above and below the thermocline. The phase shows the upward propagation of the wave. It was queried
why this wave, which appears to be transient rather than modelike, is formed quickly and always propagates with a phase velocity
of about 3 m/s. The vertical one-dimensional forcing problem was studied, where the external forcing of up and down motions
moving eastward is imposed at the surface. The growth time is estimated from the resonant solution. The first mode can resonate
quickly, but the second cannot. The response in the infinitely deep ocean was also studied to focus on the transiency, where
the reflection from the bottom is inhibited. The wave response to the forcing with a speed of about 3 m/s has a large amplitude,
i.e. quasi-resonance occurs. In this case, the thermocline plays the role of a reflector, and the upper ocean between the
sea surface and the thermocline behaves as a duct. Here, the small resonant cavity explains why the wave is formed so quickly,
and the special value of the wave velocity is interpreted as a resonance condition in the duct. The wave corresponding to
the second baroclinic mode could not be excited easily by the short-lived forcing at the surface, since this mode is mainly
structured under the thermocline. It was found that the wave damps in consequence of leaking energy downward, and the damping
rate depends on the period of the wave.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
109.
Whether the origins of the tsunami of 3 February 1605 were separated ones or a joined one, is one of the most important problems for Japanese society. When the marine knowledge has not been popularized, it has been considered that the damage pattern on Hachijo Island (including Kojima) was an important key to solving this question.It resembles the situation that the reports concerning the tsunami of 1 April 1946 were introduced to Japanese society under an internal disturbance just after the war, and we overlooked the most important consideration on the combination of tsunami and storm waves caused by the trade wind, and received this tsunami as an extraordinarily huge one.We studied the statistics of recent wind directions around Hachijo Island in January and February 1973, 1974, 1977, 1983, 1984, 1985, 1986 and 1987. And we believed that the probability was high that we could explain well that the damage pattern on Hachijo Island in 1605 was due to the combination of tsunami and storm waves caused by the monsoon.We need not, therefore, look back the damage pattern on Hachijo Island when we consider the fact that the necrologies of many temples in Shizuoka Prefecture record no death on 3 February 1605, proves to be the key to infer that the origins were separated ones. 相似文献
110.
Does heavy oil pollution induce bacterial diseases in Japanese flounder Paralichthys olivaceus? 总被引:1,自引:1,他引:0
Jun-Young Song Kei Nakayama Yasunori Murakami Sung-Ju Jung Myung-Joo Oh Satoru Matsuoka Hidemasa Kawakami Shin-Ichi Kitamura 《Marine pollution bulletin》2008,57(6-12):889
As basic research for the effect of heavy oil on the fish immune system, in this study, the number of leukocyte was counted in Japanese flounder Paralichthys olivaceus, after exposure to heavy oil at a concentration of 30 g/8 L for 3 days. To compare the numbers of bacteria in the skin mucus between oil-exposed and control fish, viable bacteria were enumerated by counting colony forming unit (CFU). Compared with 5.79 ± 1.88 × 107 leukocytes/mL in the controls, the exposed fish demonstrated higher counts, averaging 1.45 ± 0.45 × 108 cells/mL. The bacterial numbers of control fish were 4.27 ± 3.68 × 104 CFU/g, whereas they were 4.58 ± 1.63 × 105 CFU/g in the exposed fish. The results suggest that immune suppression of the fish occurred due to heavy oil stressor, and bacteria could invade in the mucus, resulting in the increasing leukocyte number to prevent infectious disease. 相似文献