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排序方式: 共有386条查询结果,搜索用时 15 毫秒
381.
He-Ping Sun Gerhard Jentzsch Jian-Qiao Xu Hou-Ze Hsu Xiao-Dong Chen Jiang-Cun Zhou 《Journal of Geodynamics》2004,38(3-5):451
The long series tidal gravity observations from 1997 to 2002 recorded with C032 superconducting gravimeter (SG) at station Wuhan/China are used in order to study the Earth's geodynamics. The tidal gravity parameters are determined precisely using Eterna software package after careful data pre-processing. The Earth's free core nutation (FCN) resonant parameters (eigenperiods, quality factors and resonant strengths) are determined accurately. The results show the determined eigenperiod to be 431.0 sidereal days with an accuracy of ±1.81%, the quality factor is a negative one as of −7002, and the resonance strength can be explained by the elastic property of the Earth's mantle. The discrepancy of the eigenperiods when using various ocean models can amount to ±1.8%. The 30 sidereal days difference between the determined eigenperiod in this paper and the one in theoretical computation given by Wahr and Bergen can be explained by the real dynamic ellipticity of the Earth's liquid core, i.e., it is about 5% larger than the one under the hydrostatic equilibrium assumption. 相似文献
382.
A three-point method for estimating wave reflection is proposed to account for monochromatic oblique incident waves propagating over a sloping beach. The amplitudes of reflected wave and incident wave are separated using wave amplitudes measured at three fixed wave gauges with a distance. The applicability of the theory is verified by comparing the simulated results with the available theoretical, numerical and experimental results for the estimation of wave reflection. The sensitivity is also tested to provide a more accurate prediction of the reflection coefficient. 相似文献
383.
Jean-Claude Sibuet Shu-Kun Hsu Xavier Le Pichon Jean-Pierre Le Formal Donald Reed Greg Moore Char-Shine Liu 《Tectonophysics》2002,344(1-2)
15 Ma ago, a major plate reorganization occurred in East Asia. Seafloor spreading ceased in the South China Sea, Japan Sea, Taiwan Sea, Sulu Sea, and Shikoku and Parece Vela basins. Simultaneously, shear motions also ceased along the Taiwan–Sinzi zone, the Gagua ridge and the Luzon–Ryukyu transform plate boundary. The complex system of thirteen plates suddenly evolved in a simple three-plate system (EU, PH and PA). Beneath the Manila accretionary prism and in the Huatung basin, we have determined magnetic lineation patterns as well as spreading rates deduced from the identification of magnetic lineations. These two patterns are rotated by 15°. They were formed by seafloor spreading before 15 Ma and belonged to the same ocean named the Taiwan Sea. Half-spreading rate in the Taiwan Sea was 2 cm/year from chron 23 to 20 (51 to 43 Ma) and 1 cm/year from chron 20 (43 Ma) to 5b (15 Ma). Five-plate kinematic reconstructions spanning from 15 Ma to Present show implications concerning the geodynamic evolution of East Asia. Amongst them, the 1000-km-long linear Gagua ridge was a major plate boundary which accommodated the northwestward shear motion of the PH Sea plate; the formation of Taiwan was driven by two simple lithospheric motions: (i) the subduction of the PH Sea plate beneath Eurasia with a relative westward motion of the western end (A) of the Ryukyu subduction zone; (ii) the subduction of Eurasia beneath the Philippine Sea plate with a relative southwestward motion of the northern end (B) of the Manila subduction zone. The Luzon arc only formed south of B. The collision of the Luzon arc with Eurasia occurred between A and B. East of A, the Luzon arc probably accreted against the Ryukyu forearc. 相似文献
384.
Since the 1980s, the increase of Asian migrants in large cities has contributed significantly to the cultural landscape of
Australia, especially in the city suburbs. Based on the Census and in-depth interviews of 103 Taiwanese migrants, this research
examines the location decisions and residential preferences of Taiwanese migrants in Sydney, Brisbane and Melbourne. The reasons
for choosing the state, the particular city, and specific area of residence are probed into. The survey shows that migrants
moved to Australia mainly for children’s education, lifestyle and political instability reasons. The main reasons for choosing
to settle in Sydney were favourable business opportunities, and the northern part of Sydney was preferred. Those who chose
Brisbane are attracted by the good climate there, and the residents preferred the Sunnybank area. Melbourne was chosen for
the good education it offers, and areas on transportation lines near good schools are selected. Choice of residence was based
mainly on their needs and their resources which may change over time. In general, they always choose to locate in close proximity
to their family, friends and Taiwanese communities. Their locational choice depends on income and housing budget, proximity
to good schools and shopping centers, and information from friends or earlier migrants. Based on such factors, this study
clearly demonstrates that the Taiwanese immigrants are fundamentally different from early Chinese settlers who once aimed
to settle at Chinatown locations. 相似文献
385.
386.
Yung-Chia Hsu Yeou-Koung Tung Jan-Tai Kuo 《Stochastic Environmental Research and Risk Assessment (SERRA)》2011,25(1):35-49
This study develops a probability-based methodology to evaluate dam overtopping probability that accounts for the uncertainties
arising from wind speed and peak flood. A wind speed frequency model and flood frequency analysis, including various distribution
types and uncertainties in their parameters, are presented. Furthermore, dam overtopping probabilities based on monthly maximum
(MMax) series models are compared with those of the annual maximum (AMax) series models. An efficient sampling scheme, which
is a combination of importance sampling (IS) and Latin Hypercube sampling (LHS) methods, is proposed to generate samples of
peak flow rate and wind speed especially for rare events. Reservoir routing, which incorporates operation rules, wind setup,
and run-up, is used to evaluate dam overtopping probability. 相似文献