著者
津金 達郎 牧野 州明 三宅 康幸 高橋 康
出版者
特定非営利活動法人日本火山学会
雑誌
火山 (ISSN:04534360)
巻号頁・発行日
vol.51, no.1, pp.49-61, 2006-02-28
被引用文献数
4

The September 2004 eruptions of Asama volcano, central Japan, ejected essential materials such as pumice with bread crust on September 1st and scoria on September 23rd. The textural and chemical analyses on the materials reveal the crystallization processes in a deep magma chamber and a shallow vent. Two distinct stages of crystallization can be recognized in size distributions and morphology of plagioclase phenocryst and microlite both in the pumice and scoria. First stage (range I ): In a deep magma chamber, pyroxene phenocryst began to crystallize out at 1150℃, and then pyroxene and plagioclase continued to nucleate and grow slowly. Second stage (range II) is divided into two sub-stages for pyroxene or three (range IIa-c) for plagioclase. II a: Magma left the chamber and rose slowly through the vent with ever increasing nucleation rate. II b-c: In a shallow vent beneath the crater, numerous plagioclase microlites like swallow-tailed shape precipitated rapidly under a high undercooling condition induced by decompression. Plagioclase microlite in the pumice and scoria developed a characteristic population density like a bell with a peak at the grain size of 0.003mm, which is interpreted to reflect a decrease in nucleation rate of plagioclase, in response to crystallization and establishment of equilibrium during the time duration when the magma stayed in the vent. Magmatic temperatures estimated from plagioclase-glass equilibrium decreased to 850℃ before the September 1st eruption. The similarity in crystal size distribution of the pumice and scoria implies that they had a common ascent history, although groundmass in the scoria has lower crystallinity than that in the pumice, suggesting that the magma of the Sept. 23rd eruption stood lower in the magma column than the Sept. 1st magma.
著者
李 相済 廣橋 容子 リ サンジェ ヒロハシ ヨウコ Lee Sang-jae Yoko Hirohashi
雑誌
国際研究論叢 : 大阪国際大学紀要 = OIU journal of international studies
巻号頁・発行日
vol.23, no.2, pp.107-118, 2010-01-31

This article considers the definition of discriminatory language and related problems. Aspects considered are the history of discrimination which is reflected in discriminatory language, the intentional use of discriminatory language to oppose discrimination and, how the language points to the existence of discrimination. The limitations of discriminatory language being viewed as a legal problem are clarified, as is the necessity for dialog between the majority and minorities to resolve these issues. It is necessary to radically change the current social structures and social relations that cause discrimination in order to achieve a solution to this problem.
著者
大堀 淳
出版者
Japan Society for Software Science and Technology
雑誌
コンピュータ ソフトウェア (ISSN:02896540)
巻号頁・発行日
vol.31, no.1, pp.1_30-1_42, 2014

コンパイラの構文解析器に広く使用されているLR構文解析の原理を解説する.LR構文解析の基礎をなすアイデアは,「正規言語の解析手法を繰り返し使い,文脈自由文法の幅広いクラスを解析する」という(多くの優れたアイデアがそうであるように)単純なものである.Knuthは,この直感的で単純なアイデアを基礎とし,緻密な理論的な展開と巧みな実用化戦略によって,構文解析におけるブレークスルーを達成した.本解説では,LR構文解析が基礎とするアイデアに即してその原理とアルゴリズムの構造を解説する.これらを理解するならば,一般に複雑で難解なものと受け取られているLR構文解析法の全体像が容易に理解できるはずである.本解説では,オートマトンの基礎知識を持つ一般の読者が,LR構文解析の考え方と原理を理解できることを目指す.
著者
中島 大輔
出版者
鹿児島大学
雑誌
経済学論集 (ISSN:03890104)
巻号頁・発行日
no.58, pp.129-147, 2002-12
著者
市原 季一
出版者
神戸大学
雑誌
國民經濟雜誌 (ISSN:03873129)
巻号頁・発行日
vol.92, no.3, pp.33-50, 1955-09
著者
遅塚 忠躬
出版者
現代史研究会
雑誌
現代史研究 (ISSN:03868869)
巻号頁・発行日
no.42, pp.39-52, 1996
著者
遅塚 忠躬
出版者
岩波書店
雑誌
思想 (ISSN:03862755)
巻号頁・発行日
no.842, pp.p1-3, 1994-08
著者
藤原 孝洋 北川 貴博 橋本 敦弘 村上 隆
出版者
函館工業高等専門学校
雑誌
函館工業高等専門学校紀要 (ISSN:02865491)
巻号頁・発行日
vol.50, pp.27-34, 2016

Several types of systems for disaster communications and networks have been studied to comprehend damage situations immediately in a heavy disaster. We have, however, been confronted with difficult issues to deploy the system actually in society, and it has not been raveled yet. To promote deployment of such a disaster resilience system, we have carried out an experimental study in the project-based learning program (PBL) of National Institute of Technology, Hakodate College (HNCT). Examining wireless mesh-networks called NerveNet, which was developed by the National Institute of Information and Communications Technology (NICT), we set up the wireless networks experimentally in HNCT. Reviewing the requirements of local governments on disaster damage assessment, we propose an impetus model to deploy the disaster system in society by exploiting a regular educational program, PBL. This paper shows a testbed of wireless mesh-networks, which is configured with NerveNet and implementing required functions in web application forms.