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97 results on '"Tsuzuki, Nobuyuki"'

2. Factors Affecting Activeness and Sustainability on Forestry in the Family Forests in Japan—From the Comparison between Aso in Japan and Styria in Austria.

Author

Kuboyama, Hirofumi, Tsuzuki, Nobuyuki, and Eda, Seira

Subjects
FOREST landowners, FORESTS & forestry, DISTRIBUTION costs, INCOME, SOCIAL history
Abstract

Forestry in Japan and Austria share many similarities in their natural and social conditions. However, the Family Forest Owners (FFOs) in Japan seem not to be active and sustainable. To understand the factors affecting activeness and sustainability in family-owned forests in Japan, in 2021 and 2022, questionnaire surveys were done with members of Forest Owners' Cooperatives (FOCs) in Aso, Japan, and Styria, Austria. Survey responses were comparatively analyzed via correlation analysis and binary logistic regression. Timber production was found to be more active in FOC Styria than in FOC Aso. One reason for this was the high-income dependence on forestry in Styria. Higher income was realized by self-harvest and the larger size of forest holdings and forest stands. The younger age of the members in FOC Styria, strongly affected by the pension system, leads to a higher self-harvest ratio. The culture of a sole child inheriting the family forest maintains the general size and scale of owned forests and stands in Styria. High distribution costs in FOC Aso reduced forestry income. As a result, sustainability was reduced in Aso because the availability of successors was low, and elderly forest owners who were once motivated by forestry tended to quit forestry. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Morphological and Compositional Changes of Human Dentin after Er:YAG Laser Irradiation.

Author

Matsumoto, Koukich, Hossain, Mozammal, Tsuzuki, Nobuyuki, and Yamada, Yoshishige

Subjects
DENTIN, MICROSCOPY, SCANNING electron microscopy, TRANSMISSION electron microscopy, X-ray spectroscopy, LASERS in dentistry
Abstract

Purpose: The present study was performed to examine the morphological and compositional changes of human dentin after Er:YAG laser irradiation by light microscopy (LM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive x-ray spectroscopy (SEM-EDX). Materials and Methods: Twenty-five dentin specimens were prepared and subjected to Er:YAG laser irradiation at 200 mJ (25.5 J/cm²) energy density; 20 were irradiated under continuous water cooling (spray, 1 mL/min) and 5 were irradiated without water spray. Five samples with water mist and 5 without were observed with SEM. Five samples with water mist were observed with TEM and the remaining 10 samples were examined by SEM-EDX. Results: SEM examination revealed a scaly or irregular surface after Er:YAG laser irradiation with water mist and an absence of a smear layer; the orifices of dentinal tubules were exposed. Irradiation without water mist produced molten amorphous structures; severe melting or cracking of the dentin was observed. TEM observation of cross sections of lased dentin presented three different zones: one of complete ablation, an ablation zone of mineral components, and an unaffected zone. The results of x-ray spectroscopy showed that the quantities of Ca (Ca weight %) and P (P weight %) were significantly greater in the lased surface. However, no significant differences were found between the Ca:P ratio of irradiated and nonirradiated areas. Conclusions: Some favorable morphological changes of the dentin were achieved by Er:YAG laser irradiation. [ABSTRACT FROM AUTHOR]

Published
2003

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