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저급 벤토나이트를 이용하여 합성한 4A형 제올라이트의 응용
노재성,홍성수 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.2
Amorphous silica produced from low grade bentonite B₁by acid treatment was used for zeolite synthesis. The zeolite 4A was used for detergent-use. The results are summerized as follows. (1) When the condition of water hardness was 40℉h, water temperature was 30℃ and the stirring rate of water was 200rpm. the cation(Ca) exchange capacity of synthetic zeolite was observed as 307㎎ CaCO₃/ g zeolite for fifteen minutes. The amount of Ca ion exchanged by zeolite was more than 95 percent within three minutes. (2) The brightness of the synthetic zeolite was between 91 and 93. The median particle size of the synthetic zeolite was 3.0㎛. (3) In differential thermal analysis, the dehydration of the synthetic zeolite was detected between 35℃ and 500℃, lattice transformation take place at about 800℃. In thermal gravimetric analysis, the weight loss of the snythetic zeolite was 20.94 percent by dehydration between 33℃ and 511℃.
시멘트의 수화응결에 대한 Sodium Naphthalene Sulfonate Formaldehyde 축합물의 영향에 관한 연구
노재성,김종웅 충남대학교 공업교육연구소 1987 論文集 Vol.10 No.1
This paper has been studied on the effect of Sodium Naphthalene Sulfonate Formaldehyde condensate(SNSF) to Cement, C₃A, C₃S and C₄AF by Zeta potential. The major results are as follows; (1) The Zeta potential of cement and C₃S are increased according to SNSF concentration, at this time, the initial hydration rate of these are retarded. On the other hand, the zeta potential of C₃A and C₄AF are decreased and initial hydration rate are accelerated. (2) Adsorption quantity of SNSF on the surface of cement and C₃S particles are increased with hydration time. But in the case of C₃A, adsorption quantity is decreased. (3) The initial hydration rate of cement is accelerated according to increasing of Na₂SO₄quantity in SNSF. But the side of this the initial hydration rate of cement is retarded.
TEOS와 Condensed Ethyl Silicate(CES)로부터 제조된 고순도 SiO₂분말의 특성
노재성,조헌영,최정봉 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.2
SiO₂powders were manufactured from TEOS, CES(condensed ethyl silicates) and PHT(partially hydrated TEOS) by sol-gel method. Then the chemical and the physical properties of the SiO₂powders are measured by IR, GC, TGA-DTA, XRD, SEM and particle size analyser. The chemical properties in IR spectra and GC analysis of CES are similar to those of PHT. Also the physical properties of SiO₂powders made from PHT are very analogous with the one manufactured from CES. The results suggest that the PHT in manufacturing of mullite and cordierite ceramics can be replaced with the CES.
성낙운,노재정,전진영 경성대학교 공학기술연구소 1998 공학기술연구지 Vol.5 No.-
The purpose of this study is to develop a system for the inspection of the outfitting arrangement design of for a ship design, which will increase the reliability and the efficiency of the inspection process. The system is composed of four major modules; material inspection module at the pipe piece level, material inspection module at the service level, tank-penetrating pipe piece inspection module, and the basic information management module. This system is integrated with a ORACLE database, for transferring and storing 3D CAD data into the inspection system, and a dVISE virtual reality system, for displaying the inspection results.
피부 원발성 CD30 (Ki-1) 양성 림프구증식 질환 : 중간형 1예 보고 Report of a Borderline Case
노낙경,윤성재,박형석,김원석,이일수 대한피부과학회 2003 대한피부과학회지 Vol.41 No.6
Primary cutaneous CD3O positive large cell Iymphoma is a cutaneous T-cell Iymphoma with a favorable prognosis, which is characterized by solitary or localized skin lesions with a tendency of spontaneous regression and frequent relapses. On the basis of the morphologic and immunophenotypic similarities between the large atypical cells in Iymphomatoid papulosis and the neoplastic cells in primary cutaneous CD30 positive large cell Iymphoma as well as their favorable prognosis, these two diseases are now regarded to be in a spectrum of primary cutaneous CD3O positive Iymphoproliferative disorder. We present a borderline case of primary cutaneous CD3O positive Iymphoproliferative disorder which recurred on the anatomic site different to the primary lesions despite multiple-agent chemotherapy. (Korean J Dermatol 2003;41(6) : 826~829)