研究發展處

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Author: search.filters.author.李培華

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    由稻殼製糠醛之研究
    (國立臺灣師範大學研究發展處, 1980-06-??) 呂美芳; 李培華
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    由玉蜀黍穗軸製糠醛之研究
    (國立臺灣師範大學研究發展處, 1982-06-??) 周治羣; 李培華
    以本省所產玉蜀黍穗軸為原料，用鹽酸、硫酸及磷酸為催化劑，使之加水分解產生糠醛(Furfural)。在常壓下，用不同濃度的酸，分別加熱相當時間，並將玉蜀黍穗軸切分為頭、中、尾三段，以比較其糠醛產率的高低。結果發現玉蜀黍穗軸之尾部用5N之鹽酸加熱2小時，所得之糠醛產率最高，約為15.6%。
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    簡易點滴法辨識普通化合物之溶解度大小與顏色
    (國立臺灣師範大學研究發展處, 1982-06-??) 周治羣; 李培華
    利用點滴法(Spot test) ，將實驗中常見之13種試劑滴在白紙上，藉其彼此間之反應形成有顏色的沉澱，而來辨別化合物之顏色及化合物在水中溶解度的大小。本實驗之設計，除了針對目前高中化學課本第十章有關溶解度定性討論之部分無良好適當之實驗外，另一特色則為本實驗所使用之器材簡單(白紙與滴瓶)，操作容易（不須在特定實驗室中進行），節省時間（約10分鐘可完成），節省藥品（只需數滴），同時教師亦可在課堂上示範操作或將結果利用投影機投射在牆壁或銀幕上，以利教學。
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    國中學生化學認知能力之研究
    (國立臺灣師範大學研究發展處, 1984-06-??) 董有蘭; 李培華
    There has seldom been a study of Chemical education of Taiwan junior high school students. I hope this study will help us understand the students' process of learning chemistry and hence will help to develop better teaching materials and teaching methods. A.Purpose 1.To determine Students' cognitive ability in chemistry according to sex. 2.Comparison of the 8th grade with the 7th grade in test results. 3.Comparison of test results in the four geographical areas of Taiwan: North, South, central and East (including offshore islands). B.Methods: written multiple choice test (one right answer of four). Test of 40 questions to be completed in 40 minutes. C.Sampling: Stratified random Sampling of 31 public junior high schools from a total of 456 throughout Taiwan, including offshore islands Kinmen and Matsu. In each of these schools two 7th grade classes and two 8th grade classes were tested with average of 45 students in each. Of the 5,735 completed forms 3,078 were boys and 2,657 were girls. D.Data Handling: By computer. E.Results: 1.The girls are a little bit better than the boys. 2.The 8th grade students are better than the 7th grade students. 3.The north and the south are about on the same level. The central and the east (including offshare islands) are about on the same lavel, but the former is somewhat better than the latter.