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Evaluation of a delayed resorbable membrane in rat guided bone regeneration
Full text link日本大学博士（歯学）doctoral thesi
Treatment Effects on Mandibular Advancement Device for Patients with Obstructive Sleep Apnea in Rugby Athletes
Full text link日本大学博士（歯学）doctoral thesi
Reversibility of Rocuronium-Induced Deep Neuromuscular Block with Sugammadex in Infants and Children - A Randomized Study
Full text link日本大学博士（医学）doctoral thesi
Journal of business, Nihon University_Vol.95_No.2(Cover, Index, Colophon)
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Layering of Administrative Paradigms in Local Administrative Reform: A Case Study in Tochigi Prefecture
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A Post-Westphalian Critical Perspective on the EU Microregions
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Water Resources and their Use in Ao-ga-shima Island, Izu ArchipelagoArchipelago: A Tentative Assumption on Regional Hydrology of Solitary Islands
Full text linkHydrological investigations were conducted in Ao-ga-shima Island, located in about 360 km south of Tokyo as a part
of Izu Archipelago, in August 2024 with a particular reference to the occurrence and use of inland water under the
restricted scarce conditions of solitary island. A field survey carried out includes measurement, observation, gathering of
verbally expressed information and collection of statistical data. This introductory monograph is designated a connection
with regional hydrology that reveals synthetically a relationship between water and human being. Ao-ga-shima Island is a
volcanic island and is covered with the latest highly permeable volcanic products, such as scoria and lava flow, that pre
vent the formation of surface water bodies. The purpose of the present paper is to make clear physical and chemical fea
tures of inland water and to analyze the effect of meteorological and social factors on the rate of reserves for water-supply
system. The main groundwater system of the island is thought to exist as a wedge of Ghyben-Herzberg’s model, being
concordant well with the fact that seawater intrusion into phreatic groundwater is caused by pumping up for irrigation at a
well 100 meters deep. Before the eruption during 1780-1785, two crater lakes were in existence, and the level of lake sur
face is assumed to be congruent with a part of main groundwater table as mentioned above. Chemical composition of a
spring water at caldera outer-rim, except for which there is almost no spring in Ao-ga-shima Island, can be quantitatively
explained by two processes; one is a weathering of basaltic minerals, pyroxene and plagioclase, and the other is a contri
bution from the dissolved constituents of seawater which might be splayed out at the time of the previous eruption and be
trapped in crater layers on the island. On the other hand, from the aspect of shortage of available water resources, acquisi
tion and management for domestic water use have become the center of attention. All of the source for water-supply sys
tem relies on rainwater, collected in the slope laying with concrete and waterproof coating. According to the result of mul
tiple regression analysis, it is concluded that the rate of water reserves is mainly explained by monthly precipitation and
evapotranspiration. These facts revealed by this study vividly demonstrate hydrological characteristics of volcanic island
with a special emphasis on the interrelationship between water and mankind from the standpoint of regional hydrology.departmental bulletin pape
