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招高壓噴射 注入工法(R.J.P)에 依한 地盤改良效果에 關한 硏究
김무일,김문섭 서울産業大學校 2000 논문집 Vol.51 No.2
The Grouting methods have been used for cut off ground water flow and for ground improvement. The methods are classified by injection pressure and grouting agents. High-pressure jet grouting method has been executed for the purpose of reinforcement of foundation. Drilling equipments when used for NX sampling of replaced mass by R.J.P(Rodin Jet Pile) and pile test were carried out. The strength of improved ground by jet grouting method R.J.P(Rodin Jet Pile) is increasing grain-size of soil in-site.
Kim, Moon-Sub,Oh, Young-Woo 경남대학교 신소재연구소 1992 論文集 Vol.2 No.-
고밀도 자기기록 매체인 Iron carbonitride는 precursor인 Iron oxalate를 암모니아 수소 혼합분위기 상태에서 질화함으로써 제조되었다. 또한 carbonitride 결정의 형태는 precursor의 제조조건에 의존하며, precursor의 제조시 Fe일부에 대한 Sn의 치환은 입자성장을 억제하고, 침상성을 증가시키는 효과가 있었다. SEM 관찰결과, 질화철 입자는 많은 미세한 단위입자들의 입체망목적으로 연결되어 있었으며, 이 단위입자는 단자구 정도의 크기로 관찰되었다. 이때 보자력과 포화자화는 각각 500 Oe, 120emu/g이었다. The morphology of the carbonitride crystallites depends on the elaboration conditions of the precursor. Magnetic recording pigment of iron nitride was prepared by nitrogenizing acicular metal iron and iron oxalate powder in an atmosphere of ammonia-hydrogen. The Sn substitution for iron leads to a strong reduction of the particle size. The Curie temperature of Fe₄(N,C) was about 490-500 C. Magnetic characteristics of Fe₄-_{x}Sn_{x}(N,C) were Hc = 500 Oe, σ_{s}= 120 emu/g. From the results of scanning electron microscopy, it is clear that the iron nitride particle consists of fine unit particles which link together to form a stereo -network structure, and that the unit particle is observed to be a single domain.