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大田市周邊河川 잔骨材의 체分析 및 有機 不純物의 影響에 關한 硏究
宋基範 大田工業專門大學 1983 論文集 Vol.32 No.-
With rapid increase of the structures in Dae jeon City, the demand of natural aggregate is now on the increase. At this juncture, it is necessary to find out if the aggregate of the rivers around Dae jeon City can be used as an excellent concrete. In this paper, by trying the fineness analysis and the test for organic impurities of the fine aggregate in the selected rivers, comparison and analysis of the effect are made : (1) It is proved that working SE economical efficiency and durability are not good in view of distribution and fineness modulus. (2) It is hard 短 hope for good concrete by using fine aggregate below midstream because of pollution in consideration of the chromaticity according to the content like organic compound.
沈正輔 大田工業專門大學 1983 論文集 Vol.32 No.-
After the transfer of the capital to woongjin , Daejeon and its vicinity became one of the leading places, since it lay in a border area of Silla and Baekjae and also in the way between the two countries. With a view prevention and observation, about forty fortifications were built near Daejeon. This paper. is to clarify the locations of Ongsansung ( 甕山城 ), Jinhyunsung ( 眞峴城 ) and Jirasung ( 支羅城 ) by field investigation besides by literature. The main contents are as follows. (1) The three castles were located in the way from silla to Baekjae , and at the time of Baekjae revival movement, the army occupied the castles to intercept the way from Silla to woongjinsung ( 熊津械 ). (2) Iti the likeliest that Ongsanslug ( 甕山城 ), re]ated inseparably to woosoolsung ( 雨述城 ) , is now Kejocksansungs( 鷄足山城 ). (3) As Jinhyunsung ( 眞峴城 ) is an important, riverside castle, that high and steep, it is appropriate that Jinhyunsung ( 眞峴城 ) is the place for Heuksuckrisansung ( 黑石里 山城 ), with steep gradient, surrounded by Kap-River on all sides but one. (4) Though the location of Jirasung ( 支羅城 ) is now under controversy, it certainly hes to the east of Keum- River, and it seems to be Jilhyunsung ( 迭峴城 ) in view of the relation with Sajeongsung (沙井城 ).
濕式燐酸中의 金屬 ion의 分離 : 重金屬 回收의 燐酸精製
辛奉文 大田工業專門大學 1979 論文集 Vol.25 No.-
Florida 産 燐鑛石을 黃酸 分解하여 얻어지는 濕式燐酸 中의 金屬 ion을 分離해 내는方法의 하나로 溶媒抽出法을 試圖해 보았다. 本 實驗의 目的은 濕式燐酸 中에 含有된 우라늄등 主要한 金屬을 分離해 내는 것 외에도 金屬表面 處理 등에 多量 使用하는 工業用 燐酸을 濕式燐酸의 精製에 의하여 얻을 수 있는가의 가능성을 模索하는데 있었다. 實驗 結果 우라늄의 分離 및 精製 燐酸의 製造가 적당한 溶媒를 使用함으로써 가능 하였음이 判明되었고 經濟的인 工程 開發을 通해서 産業化가 이루어 질 수 있음을 알았다. 또한 濕式燐酸 뿐만 아니라 Au, U 등 重金屬을 含有한 海水와 重金屬으로 汚染펄 폐수에도 重金屬 分離를 위하여 溶媒抽出法이 效果的인 方法이 될수 있을 것으로 推測된다.