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題名 | 經由科學營活動做出自己的電吉他=Build Your Own Electric Guitar from Science Camp |
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作者 | 吳明德; Wu, Ming-te; |
期刊 | 物理教育學刊 |
出版日期 | 20121200 |
卷期 | 13:2 2012.12[民101.12] |
頁次 | 頁115-122 |
分類號 | 303.4 |
語文 | chi |
關鍵詞 | 電吉他; 駐波; 磁化; 感應發電; Electric guitar; Standing wave; Magnetization; Electromagnetic induction; |
中文摘要 | 電吉他發聲的機制並不是像木吉他是由琴弦與音箱共鳴,而是由磁化後的 琴弦振動,並經由拾音器線圈所產生微弱訊號,再由放大器增強訊號推動喇叭發 聲。 本文說明由科學營隊活動中學習電吉他。為了完成電吉他,同學們除了要動手琴 身木工與放大器電工之外,還要進行電磁感應與波動等數個物理實驗。此活動除 了準備適當的工具設備以外,還必須針對學生所能理解的方式編寫教學內容與教 學步驟。 彈奏自製的電吉他很可能發生音調不準確問題,學生除了可以透過耳朵聆聽音調 高低之外,本文建議可利用電腦音效軟體進一步分析訊號頻率與波形,以方便學 生將電吉他琴弦作正確調音。 透過製作電吉他活動,不僅能激發學生的學習意願,更能協助學生統整其物理知 識與相關技能,進而體認並追求物理知識的實用性。 |
英文摘要 | Analemmatic sundial is originated in equatorial sundial, that is, 24-hour points and gnomon of equatorial sundial are projected onto a plane by a selected projection angle.The distribution of hour points and length of scale of dates (from gnomon projection) are affected by latitude, the projection angle and the inclination of the dial plane. The gnomon of analemmatic sundial is parallel to the projection direction. There are no hour lines on the dial and the time of day is read by referring to the fixed hour points. The gnomon is not fixed and must change position daily to accurately indicate time of day. Local standard time can be obtained by applying the time corrections to sundial time. The main purpose of this paper was to show how to use my sundial program to demonstrate the principles of analemmatic sundial. By changing parameters such as the latitude, projection angle, inclination of the dial plane and 3D projection parameters, the program will simulate different projections of sundial. The program also simulates the shadow change according to different date/time and longitude. Hopefully, users can use this program to promote their concept of space and time. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。