Search Results - "TOKUYAMA, Akira"

Chemical characteristics of precipitation in Okinawa Island, Japan by Sakihama, Hideaki, Ishiki, Maki, Tokuyama, Akira

“…This study examined the chemical composition and characteristics of precipitation collected from March 2003 to February 2005 in the central part of Okinawa…”
Get full text

Trend of trace metals in precipitation around Okinawa Island, Japan by SAID ALI HAMAD VUAI, TOKUYAMA, Akira

“…Okinawa Island is located between mainland Japan to the northeast, Taiwan to the southwest and China to the west. In recent years, precipitation with…”
Get full text

Chemistry of the Urauchi River Water in Iriomote Island National Park, Okinawa, Japan by Ishiki, Maki, Sakihama, Hideaki, Agata, Seizen, Tokuyama, Akira

“…The chemical characteristics of the Urauchi River water in Iriomote Island National park, Okinawa, Japan have been studied. Concentrations of PO 4 3− , NO 2 −…”
Get full text

Geochemical characteristics of runoff from acid sulfate soils in the northern area of Okinawa Island, Japan by Vuai, Said Ali, Nakamura, Kazuyo, Tokuyama, Akira

“…The oxidation of pyrite in acid sulfate soils (ASS) produces high concentration of strong acid (H2SO4) in the soil. The acid reacts with soil minerals and…”
Get full text

Dissolved aluminum and silica release on the interaction of Okinawan subtropical red soil and seawater at different salinities: Experimental and field observations by MKADAM, KOMBO MOHAMED, YONAHA, TETSUYA, ALI, VUAI SAID, TOKUYAMA, AKIRA

“…The experiment was conducted to investigate the dissolution of Al and silica when two red soils interact with seawater at different salinities. Different soil…”
Get full text

Acidification of freshwaters by red soil in a subtropical silicate rock area, Okinawa, Japan by Vuai, Said Ali, Ishiki, Maki, Tokuyama, Akira

“…Two samples of red soil, one from Gushikawa Recreation Center (GRC) and one from Okinawa Royal Golf Club (ORGC), were examined for particle size distribution,…”
Get full text

Distribution of polychlorinated biphenyls (PCBs), lead, and cadmium in Manko Tidal Flat, Okinawa by Tashiro, Yutaka, Takahira, Kaneshi, Osada, Hidemi, Fujii, Haruhiko, Tokuyama, Akira

“…Concentrations of polychlorinated biphenyls (PCBs), Pb, and Cd in sediment samples from the Manko Tidal Flat, an important area for migratory birds in Okinawa,…”
Get full text

Geologist Views of the Predicted Tokai Earthquake by Tokuyama, Akira

“…1. The hypothesis of the Tokai earthquake is based on assumption of elastic and robust slab of crust (wider than 9,000 km 2 and 15 km thick) for the overriding…”
Get full text

Solute generation and CO2 consumption during silicate weathering under subtropical, humid climate, northern Okinawa Island, Japan by Vuai, Said Ali Hamad, Tokuyama, Akira

Get full text

Solute generation and CO 2 consumption during silicate weathering under subtropical, humid climate, northern Okinawa Island, Japan by Vuai, Said Ali Hamad, Tokuyama, Akira

“…The chemical characteristics of freshwaters draining the silicate rocks in the northern part of Okinawa Island were studied to understand solute generation…”
Get full text

Effect of typhoon on chemical composition of rainwater in Okinawa Island, Japan by Sakihama, Hideaki, Tokuyama, Akira

“…We have studied the effects of typhoons on the behavior of chemical components of rainwater. Samples were collected at Yona in the northern part of Okinawa…”
Get full text

A comparison of bulk precipitation chemistry during normal and typhoon events on subtropical Okinawa Island (Japan) by Mkadam, Kombo M., Ali, Sheikh M., Tokuyama, Akira

“…Atmospheric acidic deposition and typhoons are prevalent environmental problems on subtropical Okinawa Island. This study was conducted to examine the chemical…”
Get full text

Magnesian calcite synthesis from calcium bicarbonate solution containing magnesium and barium ions by Kitano, Yasushi, Tokuyama, Akira, Arakaki, Takeshi

“…The present authors have studied the influence of barium and magnesium ions, which are contained together in a calcium bicarbonate parent solution, on the…”
Get full text

Effects of Organic Matter on Solubilities and Crystal Form of Carbonates by Yasushi Kitano, Nobuko Kanamori, Tokuyama, Akira

“…The results of a study of the role of organic compounds in the formation of carbonate crystals in marine biological systems are reported. In an increasing…”
Get full text

Geochemical behavior of chemical species in the processes of limestone formation. Part I. Chemical composition of corals and limestones in the Ryukyu Islands by Tokuyama, Akira, Kitano, Yasushi, Kaneshima, Kiyoshi

“…As one of the steps that lead to understanding limestone formation, the geochemical behavior of chemical species during limestone formation from corals was…”
Get full text

Influence of Salinity on pH and Aluminum Concentration on the Interaction of Acidic Red Soil with Seawater by Kombo, Mohamed M, Vuai, Said A, Ishiki, Maki, Tokuyama, Akira

“…Contamination of acidic red soil in the coastal areas of Okinawa Islands is a serious environmental problem. This study was conducted to examine the effects of…”
Get full text

The Role of the University in the Inservice Education of Teachers by Tokuyama, Akira

“…Universities and prefectual and local boards of education share responsibility for Japanese inservice teacher education. Results from teacher surveys and…”
Get full text