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Concerning the Diffusion Kinetics of combustion of Anthracite Coal
Hwang Bo,H,Lee,Won Kook,Kim,Sang Yul 한국화학공학회 1966 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.4 No.2
A rate equation for the combustion of anthracite coal is derived, assuming that the diffusion entirely governs the kinetics of the process. Coal powder are pressed in a form of equidimensional cylinder at constant pressure. The rate is measured by means of thermal balance. The effects of combustion temperature and molding pressure on the rate constant are investigated.
Gui-Yue Huang,Heng Bo Jiang,Jung-Yul Cha,Kwang-Mahn Kim,Chung-Ju Hwang 대한치과교정학회 2017 대한치과교정학회지 Vol.47 No.5
Objective: The purpose of this study was to examine the effect of commercially available fluoride-containing oral rinses on the corrosion behavior of titanium alloys, which are the main components of orthodontic miniscrews. Methods: Four commercially available oral rinses (solution A, pH 4.46/260 ppm fluoride; solution B, pH 4.41/178 ppm fluoride; solution C, pH 6.30/117 ppm fluoride; and solution D, pH 4.17/3.92 ppm fluoride) were tested on titanium alloy (Ti- 6Al-4V) circular plates, and saline was used as the control. The open-circuit potential and potentiodynamic polarization of these materials were measured. Thereafter, all samples were evaluated under a field-emission scanning electron microscope. Results: Among the tested oral rinses, except solution D, the more the fluoride content was, the greater was the corrosion potential downtrend; the corrosion resistance of the titanium alloy sample was also lowered significantly (p < 0.05). Field-emission scanning electron microscopic analysis of the surface morphology of the titanium alloy samples revealed that all samples had some defects, crevices, or pitting after exposure to the oral rinses than before treatment. In particular, the samples in solution A showed the most changes. Conclusions: Commercially available oral rinses having a high fluoride concentration and a low pH may reduce the corrosion resistance of titanium alloys used in dental appliances such as orthodontic titanium miniscrews and brackets.
아토피피부염 환자에서 소아와 성인의 MAST CLA 검사에 의한 혈청 총 IgE 검사와 알레르겐 특이항체 검사 성적의 평가
김형동 ( Hyung Dong Kim ),조문균 ( Moon Kyun Cho ),이성열 ( Sung Yul Lee ),이종석 ( Jong Suk Lee ),박영립 ( Young Lip Park ),황규왕 ( Kyu Uang Whang ),황보영 ( Bo Young Hwang ) 대한피부과학회 2007 대한피부과학회지 Vol.45 No.5
Background: The multiple allergosorbent test chemiluminescent assay (MAST-CLA) system is a simple method for measuring total and allergen-specific IgE antibodies in the serum of patients with atopic dermatitis. Total IgE, however, is much frequently higher, even if no allergen-specific IgE antibodies can be detected in serum. Objective: The purpose of this study was to evaluate total IgE class, the allergen frequencies and their correlations in MAST-CLA in child and adult atopic dermatitis patients respectively. Methods: A total of fifty two adult patients and ninety child patients with atopic dermatitis were evaluated by MAST-CLA between march 2002 and march 2005 at Soonchunhyang hospital. Positive rates of specific IgE and the total serum IgE level of the MAST-CLA allergy system were compared between child and adult patients. Results: Among the subjects, 84.5% (80.0% for child patients and 92.3% for adult patients) of patients showed an elevated serum total IgE (more than class level 2) and 54.9% (45.6% for child patients, 71.2% for adult patients) revealed at least more than one allergen-specific IgE by MAST-CLA. The average 3.76 (3.39 for child patients, 4.16 for adult patients) different allergens was simultaneously detected in a single positive serum. Commonly-positive allergen rates, in descending order, were D. farinae 44.4%, D. pteronyssynos 38.7% and house dust 26.8%. Furthermore, the higher total serum IgE level in adult patients, the more probability of allergen-specific IgE positive results being disclosed (p<0.05). The number of allergen-specific IgE positive results was increased in a higher serum total IgE level (p<0.05). But total IgE positive rates which had allergen-specific antibody negative patients was 37.5% (45.8% for child patients, 25.0% for adult patients). Good correlation was obtained between total IgE levels and number of positive allergen-specific IgE in MAST-CLA, with 0.551 correlation coefficiency (p<0.05). Conclusion: Our study suggested that the MAST-CLA allergy system is a useful screening test to detect allergenspecific IgE and to evaluate patients with atopic dermatitis. But other allergen screening tests should be used for detecting allergens, when MAST-CLA total IgE class is increased over class 2 with no detectable specific IgE. (Korean J Dermatol 2007;45(5):413~421)