A nozzle position control for the road surface decontaminating System
The Great East Japan Earthquake that occurred on March 11, 2011 resulted in the explosion of the TEPCO Fukushima 1st Nuclear Power Plant and the global dispersion of a large quantity of radioactive substances. A high radiation dose was particularly recorded in Fukushima prefecture several weeks after the accident, although the level is presently sufficiently low. However, considering that the adverse effects of low but extended exposure to radiation are yet to be negated, there is the urgent need for further decontamination. In our study, we focused on the efficient decontamination of radioactive substances in residential areas, for which we propose a high-pressure water jet system for washing road surfaces. The system differs from conventional systems of its type that were initially designed for use in the immediate environment of the nuclear reactors of the TEPCO Fukushima 1st Nuclear Power Plant. The proposed system consists of multiple washing, transporter, and server robots. The washing robots decontaminate the road surface using high-pressure water jets and are transported between washed and unwashed areas by the transporter robots. The server robots supply the water used for washing and absorb the polluted water together with ground dust. In this paper, we describe the concept of the system and present the results of decontamination experiments. Particular attention is given to the washing robot and its mechanism and control method. The results of the integration of the washing robot in an experimental system confirmed the feasibility of the proposed system.
放射性物質除去を目的とした路面洗浄ロボットシステム;放射性物質除去を目的とした路面洗浄ロボットシステム;Road Surface Washing System for Decontaminating Radioactive Substances
The Great East Japan Earthquake that occurred on March 11, 2011 resulted in the explosion of the TEPCO Fukushima 1st Nuclear Power Plant and the global dispersion of a large quantity of radioactive substances. A high radiation dose was particularly recorded in Fukushima prefecture several weeks after the accident, although the level is presently suﬃciently low. However, considering that the adverse eﬀects of low but extended expo-sure to radiation are yet to be negated, there is the urgent need for further decontamination. In our study, we focused on the eﬃcient decontamination of radioactive substances in residential areas, for which we propose a high-pressure water jet system for washing road surfaces. The system diﬀers from conventional systems of its type that were initially designed for use in the immediate environment of the nuclear reactors of the TEPCO Fukushima 1st Nuclear Power Plant. The proposed system consists of multiple washing, transporter, and server robots. The washing robots decontaminate the road surface using high-pressure water jets and are transported between washed and unwashed areas by the transporter robots. The server robots supply the water used for washing and absorb the polluted water together with ground dust. In this paper, we describe the concept of the system and present the results of decontamination experiments. Particular attention is given to the washing robot and its mechanism and control method. The results of the integration of the washing robot in an experimental system conﬁrmed the feasibility of the proposed system.
The Common European Framework of Reference for Languages, the European Language Portfolio, and language learning in higher education
Abstract This article explains the relevance of the Common European Framework of Reference for Languages (CEFR) and the European Language Portfolio (ELP) to language learning in higher education, especially as regards the definition of aims and learning outcomes and the promotion of students' capacity to manage their own learning. After providing some historical background, the article expounds the CEFR's action-oriented approach, explores it conceptualisation of progression in language learning and its implications for language teaching, and suggests how it can be applied to the design, implementation and assessment of language learning programmes in higher education. It then introduces the ELP, explains how it can be used in conjunction with the CEFR to support coherent programme delivery while promoting reflective learning and student autonomy, and concludes by considering the role of self-assessment in the university's assessment framework. The article ends with a cautionary tale.