Is the Chandler period variable?   总被引：2，自引：0，他引：2  

Shuhei Okubo 《Geophysical Journal International》1982,71(3):629-646

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Time series analysis of natural remanent magnetization in deep-sea sediments     

Shuhei Okubo  Hitoshi Takeuchi 《Geophysical Journal International》1979,56(2):309-318

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Evaluations of subsurface flow for reconstructions of climate change using borehole temperature and isotope data in Kamchatka     

Akinobu Miyakoshi  Makoto Taniguchi  Yasukuni Okubo  Takeshi Uemura 《Physics of the Earth and Planetary Interiors》2005,152(4):335-342

Subsurface temperature is affected by heat advection due to groundwater flow and surface temperature changes. To evaluate their effects, it was implemented the measurements of temperature-depth profile (T-D profile) and the continuous monitoring of soil temperature in the southern part of Kamchatka which has not affected by human activity. Additionally, stable isotopic compositions of surface water and groundwater were analyzed. T-D profile and stable isotopic compositions show groundwater flow system is differ from the shallow aquifer to the deep aquifer. In the shallow aquifer, T-D profile suggests the existence of upward groundwater flux. On the other hand, the annual variation of soil temperature is divided into the large variation period (VP) and the stable period (SP) by the magnitude of daily and seasonal variation. VP and SP correspond to the summer and the winter season, respectively, and it considers that the difference between VP and SP is caused by the effect of snow cover. Therefore, the T-D profile is affected by not only upward groundwater flux but also the surface warming particularly in the summer season (VP).  相似文献   

An Analytical Investigation of a Variable-Compliance-type Constitutive Equation     

S. Okubo  K. Fukui 《Rock Mechanics and Rock Engineering》2006,39(3):233-253

Summary. A constitutive equation is proposed in which the compliance is assumed to monotonically increase as a load is applied. The primary feature of the constitutive equation is that the equation can be applied to various loading conditions such as constant stress rate, constant strain rate, creep, or relaxation. The second feature is that the equation has exact solutions under many loading conditions. The present paper shows the exact solutions for the constitutive equation and investigates the mutual relationships between the exact solutions for the different loading conditions. The third feature is that it is comparatively easy to find the constants in the constitutive equation. The present paper shows how to solve the constitutive equation for the constants, and the constants for some native Japanese rocks. The constitutive equation used in the present paper is extremely simple. Therefore, the equation can be easily implemented in almost any FEM code. It is likely that additional terms of the constitutive equation will prove necessary for practical usage. However, additional terms can be found very easily by finding higher-order approximations of experimental data.  相似文献   

Erratum to “Argon isotopic composition of some Hawaiian historical lavas” [Chemical Geology 226/1-2 (2006) 66-72]     

Ayako Ozawa  Takahiro Tagami 《Chemical Geology》2006,231(4):364-365

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