English summary of the 2 number of volume 46 publishing paper

Original Paper

Title: Teaching materials using loudspeaker for assignment study of technical high school
Auther: Kin'ya MATSUMOTO，Hisato YAMAMOTO，Manabu TACHI，Akinobu INAHAMA

題目：オーディオスピーカの設計・製作・評価を題材にした工業科課題研究
著者：松本金矢，山本尚登，舘学，稲濱章誠

A teaching material for subject research practiced in technical high school is proposed. In this research, a synthetic system is developed to design and produce an audio loudspeaker system. In the design stage, the CAE technique is introduced for prediction of acoustic characteristics of the loudspeaker. In the measuring system, an FFT analyzer by using a personal computer with an AD converter card and simple anechoic room for the sound pressure measurement are proposed, which can be realized in technical high school. A pair of back loaded horn type loudspeaker are designed and produced to compare the measurement result with the analytical result. As a result of verifying the system by the comparison of analytical and measurement result of the acoustic characteristic, the effectiveness of the developed system in this study was confirmed.

Key words: teaching material, research ability, audio loudspeaker, CAE

Title: A Historical Study on Provincial Fisheries Training Institute under the Ministry of Agriculture and Commerce in Chiba Prefecture
Auther: Takafumi SASAKI

題目：千葉県における農商務省管轄府県水産講習所の歴史的役割
著者：佐々木貴文

We examine the Chiba Prefecture Fisheries Training Institute, analyzing its courses, curricula and thereby its educational history, in order to clarify the historical role of post-primary fishery education under the jurisdiction of the Ministry of Agriculture and Commerce, which controlled pre-war policy and influenced the development of the fishing industry.? The following observations are made;
　(1) From its establishment until February, 1909, the Chiba Prefecture Fisheries Training Institute focused mainly on promoting fisheries in the local area, but from March of that year, in response to incentives to promote pelagic fishing from the Ministry of Agriculture and Commerce, it established a pelagic fisheries course and began training workers for the pelagic fishing industry.
　(2) This course then influenced other educational institutions in Chiba Prefecture, and training workers for the pelagic fishing industries became a special characteristic of fishery education throughout Chiba Prefecture.

Key words: fishery education, Provincial Fisheries Training Institute, Ministry of Agriculture and Commerce, pelagic fisheries, Chiba Prefecture

Title: A Study on the Characteristics of the Resistance due to the Blunt Aft End of a Body
−Development of a Method to Estimate the Resistance due to the Aft End−
Auther: Yoshikazu KUSUNOKI，Tadao YAMANO，Fumiyasu KURATANI，Takenori OGAWA

題目：ブラントな後端を持つ物体の後端による抵抗の特性に関する研究
―後端による抵抗の推定計算法の開発―
著者：楠芳一，山野惟夫，鞍谷文保，小川武範

　It is not easy to treat analytically the flow behind the blunt aft end of a body, because the flow accompanies complicated phenomena. The flow behind a ship with the transom stern, which we take up as a body with the blunt aft end, is far more complicated, because the free surface is added as a boundary. The purpose of the present study is to develop a method to estimate the resistance due to the transom stern. Development of a method to estimate the resistance due to remaining following waves, one of two main components of stern waves, is tried in this paper. Aiming to develop an analytical method convenient to use for transom stern form design, trochoidal wave which can treat non-linear wave also is used to describe the above mentioned complicated flow. As a result, a practical method to estimate the resistance due to the transom stern has been developed.

Key words: Blunt aft end, Transom stern, Resistance, Estimation method of resistance, stern wave, Remaining following wave, Forword-oriented wave breaking

Practical Paper

Title: Production of Engine Cars/Ships Using TiNi Shape Memory Alloy Wire
Auther: Yasuhiro MATSUNAGA，Yasuhiro MIZUNO

題目：TiNi形状記憶合金ワイヤーを用いたエンジンカー／エンジンシップの製作
著者：松永泰弘，水野靖弘

　In a university classroom, we practiced building an engine made with shape memory alloy wire (a functional material), to test such a project's suitability as a tool for teaching energy conversion in "technology and object-making" in technology and home economic courses. At first, we demonstrated for the university students the properties of the shape memory alloy, and then the basic structure of the engines using two pulleys and the TiNi shape memory alloy wire. After that, the students constructed the engine cars/ships. Through experiments?and trial and error?they measured the temperature at which the wire recovers its form and ascertained optimal conditions for producing power.

Key words: TiNi, Shape Memory Alloy, Engine, Functional Material, Teaching Materials

Case Study Paper

Title: Making Bronze Mirrors: A Friendship Project
Auther: Satoshi EMA

題目：フレンドシップ事業での銅鏡製作について
著者：江馬諭

　This study reports on a project, beginning in fiscal 2001 and continuing for three years, to produce bronze mirrors in an object-making class.? All eighty-six students who participated in the program were able to complete a mirror.? A survey of participants revealed that they felt tremendous interest during the casting stage and upon completion of their mirrors-and also that they found the tedious grinding operation difficult.? However, the majority of participants expressed overall satisfaction with the project.? From the above, it seems that bronze-mirror production may be a suitable project for an object-making class.? In reflective essays, the university students who supported the participants pointed out the importance of understanding children's behavior and feelings and of spending time together.? Thus, those who played supervisory roles seem able to develop practical leadership skills through activities such as this one.

Key words: object-making, Friendship Project, bronze mirror, practical leadership skills

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