Controlling factors of seasonal variation in the nitrogen isotope ratio of nitrate in a eutrophic coastal environment     

Ryo Sugimoto  Akihide Kasai  Toshihiro Miyajima  Kouichi Fujita 《Estuarine, Coastal and Shelf Science》2009,85(2):231-240

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Introduction     

Satoshi Yamamoto 《Mathematical Geology》1993,25(7):757-758

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Earthquake design considerations in reinforced concrete columns     

Toshihiko Hisada  Nobutsugu Ohmori  Satoshi Bessho 《地震工程与结构动力学》1972,1(1):79-91

Damages resulting from the Tokachi-Oki earthquake of 1968 demonstrated that many code-designed reinforced concrete columns do not have adequate earthquake resistance. A review of Japanese research revealed that the axial force ratio, the moment arm ratio, and the type and ratio of transverse reinforcement control the resistance and ductility of concrete columns. A recent experimental study at the Kajima Institute of Construction Technology evaluated the resistance of columns with three types of transverse reinforcement and three reinforcement ratios subjected to repeated alternating loads. Tied and spiral columns proved to be superior to hooped columns.  相似文献   

The influence of multiple diffraction on the space group determination of orthopyroxene,spodumene, low omphacite and pigeonite     

Satoshi Sasaki  Takeo Matsumoto  Chikako Sawada 《Physics and Chemistry of Minerals》1981,7(6):260-267

Forbidden reflections of some pyroxenes described as having a lower symmetry than Pbca or C2/c have been examined, mainly using the detailed ψ-scanning method of the four-circle automated diffractometer. All reflections violating the systematic absences of Pbca orthopyroxene, C2/c spodumene, P2/n omphacite and P2₁/c pigeonite were found to be due to the Umweganregung process of multiple diffraction; the Umweganregung peaks observed for the ψ azimuth were indexed in terms of a four-circle geometry. Thus, the space groups of orthopyroxene, α spodumene, low omphacite and low pigeonite were confirmed to be Pbca, C2/c, P2/n and P2₁/c, respectively.  相似文献   

Construction of GPS MonitoringNetwork,Characteristics of RecentCrustal Movement,and Relationbetween Stress Field andEarthquake Activity in the NingxiaRegion     

Xu Wenjun  Zhao　Weiming  Chai Chizhang  Jin Yanlong  Sun Lixin  Zheng Sihu  Satoshi Miura 《中国地震研究》2001,15(3):252-265

INT正ODU**!0厂Nln以la Is located In the nol’th segmentdthe North－southselsnuc Belt,Whlchls thejuncturedthe Qinghai－Xizang(Dbet)block,Alxa block and Odos block．In that region,the tectonic activity。svery strong;。y strong earthquakes occu。d In history,such as the 1739 ingluo M。8．0 earthqu拙eandl920 Halyuan M。8．5 eafthquake,etc．; Merately strongeaFthquakes are still veryactlve atpresent,onlyln the Wuzhong－un斟m area,there have been7 e血hquakes tvlth M。＞5．0 to occ…  相似文献   

Plasma flow around coronal loops     

Satoshi Hinata 《Solar physics》1982,80(1):173-183

Current dissipation models of coronal loop heating are studied. Turbulent current dissipation is shown to lead to a time dependent process because of an enormous mass motion induced in the current layer. A stationary heating process involves only ohmic heating, which requires a large current layer. To insure MHD stability, the loop must be composed of many elements with the oppositely directed currents. A stationary current dissipation process induces the plasma motion across the magnetic field into the loop and down the loop with the speeds v 10⁴ cm s^–1 and v 10⁴ cm s^–1, respectively. The pressure of the loop is also estimated to be proportional to the current density: p/J=6.3 × 10^-8dyn/statamp.  相似文献   

Understanding Japanese sardine migrations using acoustic and other aids   总被引：3，自引：0，他引：3  

Tameishi  H.; Shinomiya  H.; Aoki  I.; Sugimoto  T. 《ICES Journal of Marine Science》1996,53(2):167-171

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Notes on linear and nonlinear barotropic flows in a polar circular basin     

Satoshi Sakai  Shiro Imawaki 《Journal of Oceanography》1981,37(5):287-293

Barotropic flows in a circular ocean are studied. Flows are driven by an inflow and an outflow through openings at the circumference. A linear, steady state solution is interpreted in terms of dissipating planetary waves. A weakly nonlinear, steady state solution is obtained numerically. It differs remarkably from the linear solution; an intense anticyclonic polar gyre extending over the whole basin is formed. The nonlinear term is essential to the gyre and can not be neglected, although the Rossby number is small.  相似文献   

Direct Current Measurements off Sanriku, East of Japan     

Sachihiko Itoh  Takashige Sugimoto 《Journal of Oceanography》2002,58(6):877-882

One year records of four current meters moored at two sites off Sanriku (39°26′ N, 142°45′ E and 143°E) have been analyzed. Mean currents flowed southward to southwestward with velocity 2.5–7.8 cm s⁻¹. The geostrophic velocity appeared to be surface-intensified, and the flows at 500 m depth have a relationship with the 100 m depth temperature distribution, suggesting the influence of the upper layer flows. At a depth of 1500 m and 2500 m, southward to southwestward flows are thought to be a part of the current flowing southward on the western flank of the Japan Trench. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Warm water intrusion from the Kuroshio into the coastal areas south of Japan   总被引：1，自引：0，他引：1  

Akihide Kasai  Shingo Kimura  Takashige Sugimoto 《Journal of Oceanography》1993,49(6):607-624

Sea surface temperature (SST) has been measured in the south of Japan using a thermometer set up in the ferry boat to investigate the characteristics of the warm water intrudes into the coastal areas from the Kuroshio. Time series analysis was applied to the SST data with satellite images and hydrographic observation data from April 1987 to September 1989. The results indicate that the warm Kuroshio water intruded into the coastal areas on the Enshu-nada and the Kumano-nada Seas intermittently with periods of about 50 and 20 days associated with the fluctuation of the Kuroshio path and the Kuroshio frontal disturbance respectively. The intrusion with a 50-day period was dominant when the Kuroshio took a stationary small meander path (B- and C-types). The warm water spread to the west at 20 cm s^–1, and was estimated to have a depth of 150 m at least and supply enough heat to make up the loss due to the evaporation in the coastal area. During the straight path of the Kuroshio, it was detected that the warm water intruded into coastal areas only with a 20-day period. The warm water that intrudes with a period of 20 days spreads to the west at 25 cm s^–1 in a small scale.  相似文献