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K-Ar Age Detwermination of a Lava Stalagmite in Manjang Cave Jeju Island Korea
Okada, Toshinori,Itaya, Tetsumaru,Sawa, Isao,Hong, Shi-Hwan The Speleological Society 1995 Journal of the speleological society of korea Vol.42 No.2
THE K-AR METHOD of age determination is commonly used to date rocks from Pleistocene volcanoes in Japan (e.g. Kaneoka et al. 1980, Itaya et al. 1984, Shimizu et al. 1988, Itaya et al. 1989). However. there are still many problems with K-Ar dating of the young volcanic rocks, as reviewed by Itaya and Nagao (1988).(omitted)
Nakata Chisa,Itaya Akemi 대한공간정보학회 2021 Spatial Information Research Vol.29 No.4
The rapid increase of woody biomass power plants has given rise to concerns about the balance of supply and demand. The purpose of this study was to explore forests vulnerable to over-logging and show them visually in Mie Prefecture, central Japan when supplying woody biomass to power plants based on transportation distance and the time using a non-commercial road network. The destinations were the three biomass power plants and the origins were artificial forests divided by watersheds. Transportation distances and time between destinations and origins were estimated using the routesearch function in Google Maps. Forests vulnerable to over-logging were explored based on two thresholds: a one-way distance of 50 km and a travel time of 2.5 h. Our results show that many of the artificial forests in Mie Prefecture might be subject to high harvesting competition. In all, 55.07% of the forest plantations in Mie Prefecture were within 50 km of two or three biomass power plants and 87.11% were within 2.5 h one-way. It might be necessary to supply woody biomass from southern Mie Prefecture. The stakeholder should share logging plans and monitor over-logging while planning for the efficient use of woody biomass in the southern part of Mie Prefecture.
Development of Centralized Voltage Control System for Distribution Systems
Ohno, Tetsufumi,Takano, Tomihiro,Itaya, Nobuhiko 대한전기학회 2013 The Journal of International Council on Electrical Vol.3 No.4
This paper proposes a centralized voltage control system for distribution system to meet the impact of PV growth. The system consists of a server machine at control center and many field devices like voltage regulators, line switches with sensor to measure power flow and voltage, and Information and Communication Technologies (ICT) network under Smart Grid paradigm. The system gathers measurement values from switches through the ICT network and chooses the best voltage profile and voltage regulators condition to achieve the profile with use of our advanced Optimal Power Flow. The test results at our Smart Grid facilities with 4MW photovoltaic generators are also given to prove the effectiveness of the developed system.
Thanh, N.X.,Rajesh, V.J.,Itaya, T.,Windley, B.,Kwon, S.,Park, C.S. Universitetsforlaget ; Elsevier Science Ltd 2012 Lithos Vol.155 No.-
The northwestern Himalaya in India contains critical evidence of the convergent margin and collision tectonics between the Ladakh arc and the Karakoram block. Here we present new petrochemical and geochronological data from a forearc ophiolite at the Shyok@?Nubra river confluence. Whole-rock geochemical data show relatively high large-ion lithophile elements (LILE), light rare earth elements (LREE), and Ba, U and Pb anomalies, and depletions in La, Ce and Zr, particularly, the high-field strength elements (e.g. Nb, Ta); these geochemical characteristics are similar to those in modern ophiolites that formed in arc-related environments. Meta-volcanic greenschists that contain spinel layers have high MgO, Ni, Co, and Cr contents. In contrast, they have low contents of TiO<SUB>2</SUB>, very low Nb and Zr that are diagnostic of high@?Ca boninitic magmas in modern forearc settings, as in Izu-Bonin-Mariana (IBM) and Tonga. The spinels have high Cr# [Cr/(Cr+Al)] and Mg#[Mg/(Mg+Fe<SUP>2+</SUP>)], which are characteristic of spinels in forearc boninite@?type of melts. The spinel-free meta-volcanic samples have incompatible trace element abundance patterns similar to those of MORB. However, their enrichments in Cs, Rb, Pb, U and depletion in HFSE may reflect an input of subduction fluids that are different from MORB; these MORB-like basalts are suggestive of a forearc complex that erupted prior to the formation of boninitic rocks. Our data from the Shyok ophiolite indicate the existence of supra-subduction rocks on the southern Karakoram margin. Albite porphyroblasts in greenschists yield a K-Ar age of 104.4+/-5.6Ma that represents the time of early exhumation of the greenschists. The boninite@?type melts formed prior to 104Ma, thereby indicating that the time of initiation of subduction on the southern margin of the Karakoram block was before 104Ma. These geochemical signatures together with the spatial and temporal distribution of the arc rocks on the southern margin of Karakoram block suggest northward subduction of NeoTethys in the Early Cretaceous. The subsequent collision between the Ladakh arc and the Karakoram block thrusted/obducted the forearc ophiolite onto the southern edge of the Karakoram block probably between 74Ma and 97Ma.