A5033383658- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Groundwater and Isotope Geochemistry
- Geological and Geochemical Analysis
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Metal Forming Simulation Techniques
- Hydrocarbon exploration and reservoir analysis
- High-Velocity Impact and Material Behavior
- Radioactive contamination and transfer
- Microstructure and mechanical properties
- Fatigue and fracture mechanics
- Seismology and Earthquake Studies
- Metallurgy and Material Forming
- Geochemistry and Geologic Mapping
- Groundwater flow and contamination studies
- Microbial Community Ecology and Physiology
- Cultural Heritage Materials Analysis
- Water Treatment and Disinfection
- Atmospheric chemistry and aerosols
- Archaeology and ancient environmental studies
- Mineralogy and Gemology Studies
- Karst Systems and Hydrogeology
- Synthesis and properties of polymers
National Institute of Advanced Industrial Science and Technology
2011-2024
Geological Survey of Japan
2014-2024
Fujita Health University Hospital
2024
Gemological Institute of America
2016-2023
Iwate Prefectural Central Hospital
2014-2023
Tokushima University
2021
Kasugai Municipal Hospital
2020
Niigata University
2015-2018
Kanagawa Institute of Technology
2018
Toho University
2017
Hot dry rock geothermal energy extraction experiments in artificial reservoirs created by hydraulic stimulation naturally fractured crystalline rocks have been undertaken several countries over the last 20 years. The had mixed results terms of fluid recovery, system impedance, and heat extraction. Numerical models not yet delivered a generally agreed understanding processes sensitivities involved reservoir creation circulation. In this paper two‐dimensional fracture network model is...
Gas hydrates deposited in subseafloor sediments are considered to primarily consist of biogenic methane. However, little evidence for the occurrence living methanogens has been provided. This study investigated viable methanogen diversity, population, physiology and potential activity hydrate-bearing (1-307 m below seafloor) from eastern Nankai Trough. Radiotracer experiments, quantification coenzyme F430 molecular sequencing analysis indicated methanogenic predominance hydrogenotrophic...
Abstract Hydrated halloysite clays altered from glassy tuff during weathering were examined in detail by x-ray, thermal, and electron micrographic methods. The micrographs show fibrous crystals of hydrated associated with many rounded grains, the former frequently jutting out latter. X-ray powder diffraction data thermal curves clearly presence halloysite, on closer examination dehydrated a small amount montmorillonite can be detected. allophane as an accessory mineral is suggested certain...
Microbial methane oxidation has a significant impact on the flux from marine gas hydrate areas. However, environmental fate of remains poorly constrained. We quantified relative contributions aerobic and anaerobic methanotrophs to consumption in sediments hydrate-bearing Sakata Knoll, Japan, by situ geochemical microbiological analyses coupled with 13C-tracer incubation experiments. The ANME-1 ANME-2 species contributed 33.2 1.4% fluxes at 0–10 10–22 cm below seafloor (bsf), respectively....
Using a fine, rigid endoscope (Olympus, SES-1711K), we examined the middle ear, including tympanic orifice of eustachian tube, children with otitis media effusion (OME) in its active stage (26 ears), convalescent (13 and during treatment ventilation tubes for 10 days to 6 months (five ears) through myringotomy patients under general anesthesia. Several color photographs representative ears are shown. In OME, edema (73.1%) hyperemia (23.1%) were characteristic features ear mucosa, normal...
Summary Anaerobic methane‐oxidizing archaea (ANME) are known to play an important role in methane flux, especially marine sediments. The 16S rRNA genes of ANME have been detected terrestrial freshwater subsurfaces. However, it is unclear whether actively involved oxidation these environments. To address this issue, Holocene sediments the subsurface Kanto Plain Japan were collected for biogeochemical and molecular analysis. potential activity anaerobic (AOM) (0.38–3.54 nmol cm −3 day −1 ) was...
Little is known about the microbial distribution patterns in subseafloor sediments. This study examines diversity and activities sediments of Nankai Trough, where biogenic gas hydrates are deposited. Illumina sequencing 16S rRNA genes revealed that prokaryotic community structure correlated with hydrate occurrence depth but not sedimentary facies. The bacterial phyla 'Atribacteria' lineage JS1 Chloroflexi dominated all samples, whereas lower taxonomic units accounted for variation related to...
Diurnal variation in the atmospheric CO2 concentration and carbon isotopic composition (Δ14C δ13C) was measured a forest an urban area on 9 February 1999. The isotope approach used present study differentiated between quantitative contributions from anthropogenic biogenic sources atmosphere. (fossil fuel) (soil respiration) estimated, they ranged 1 to 16% 2 8% of total CO2. diurnal major cause variation, while remained relatively constant throughout day. Estimating contribution soil respired...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetection of carbon-13-nitrogen-15 coupled units in adenine derived from doubly labeled hydrogen cyanide or formamideHiroshi Yamada, Masaaki Hirobe, Kimio Higashiyama, Hiroshi Takahashi, and Kazuo T. SuzukiCite this: J. Am. Chem. Soc. 1978, 100, 14, 4617–4618Publication Date (Print):July 1, 1978Publication History Published online1 May 2002Published inissue 1 July...
Abstract Unique photodegradable polyamides have been prepared by solution polymerization of diphenyl α‐truxillate or δ‐truxinate with hexamethylene nonamethylenediamine, followed melt polymerization. Photochemical properties resulted were studied spectroscopically and are discussed in terms photoreversibility monomeric derivatives for comparison. Solution viscosity the polymer was decreased irradiation a high‐pressure mercury lamp. The polymers from α‐truxillic acid depolymerize action...
Research Article| February 01, 2016 Gas pathways and remotely triggered earthquakes beneath Mount Fuji, Japan Koki Aizawa; Aizawa * 1Earthquake Institute, University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-0032, Japan2Institute Seismology Volcanology, Faculty Sciences, Kyushu University, 2-5643-29 Shin'yama, Shimabara, Nagasaki 855-0843, *E-mails: aizawa@sevo.kyushu-u.ac.jp; uyeshima@eri.u-tokyo.ac.jp; y.yamaya@aist.go.jp; hase@gerd.co.jp; h.a.takahashi@aist.go.jp;...