http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hydrogen gaseous effects on fracture resistance of API-X70 estimated by XFEM
DONG-HYUNKIM,심재민,Yoon-Suk Chang,백운봉 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.9
Hydrogen embrittlement has been recognized as one of major degradation mechanisms causing the decrease of ductility and fracture toughness of several kinds of materials. In accordance with the demand for hydrogen fuels, it becomes more important to ensure safety of relevant facilities like pressure vessels, storage tanks and so on. The objective of this study is to examine fracture resistance of American Petroleum Institute (API)-X70 steel under highly pressurized hydrogen gaseous condition. The extended finite element method (XFEM) was adopted to predict J-R curves via a crack growth simulation approach. At first, preliminary analyses for SM490A carbon steel were carried out to demonstrate applicability of the XFEM, of which result was comparable to test data within 14 %. Subsequently, iterative numerical analyses were conducted to calibrate appropriate damage parameters for the APIX70 steel by using notched round bar specimens. Finally, crack growth simulations of 1Tcompact tension (CT) specimens were performed adopting the calibrated parameters. J ICvalues determined from predicted J-R curves were compared with 1/2T-CT CTOD test data and relevant constraint effect was discussed.
Characterization of Cell Wall Proteins from the soo1-1/ret1-1 Mutant of Saccharomyces cerevisiae
Dong-WonLee,Ki-HyunKim,Se-ChulChun,Hee-MoonPark 한국미생물학회 2002 The journal of microbiology Vol.40 No.3
In order to investigate the function of Soo1p/α-COP during post-translational modification and intracellular transport of cell wall proteins in Saccharomyces cerevisiae, cell wall proteins from the soo1-1/ ret1-1 mutant cells were analyzed. SDS-PAGE analysis of biotin labeled cell wall proteins suggested that the soo1-1 mutation impairs post-translational modification of cell wall proteins, such as N- and/ or O-glycosylation. Analysis of cell wall proteins with antibodies against β-1,3-glucan and β-1,6-glucan revealed alteration of the linkage between cell wall proteins and β-glucans in the soo1-1 mutant cells. Compositional sugar analysis of the cell wall proteins also suggested that the soo1-1 mutation impairs glycosylation of cell wall protein in the ER, which is crucial for the maintenance of cell wall integrity.
Effects of Heterostructure Electrodes on the Reliability of Ferroelectric PZT Thin Films
Seung-HyunKim,Hyun-JungWoo,구창영,양정승,Su-MinHa,박동연,Dong-SuLee,하조웅 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.4
The effect of the Pt electrode and the Pt-IrO2 hybrid electrode on the performance of ferroelectric device was investigated. The modified Pt thin films with non-columnar structure significantly reduced the oxidation of TiN diffusion barrier layer, which rendered it possible to incorporate the simple stacked structure of Pt/TiN/poly-Si plug. When a Pt-IrO2 hybrid electrode is applied, PZT thin film properties are influenced by the thickness and the partial coverage of the electrode layers. The optimized Pt-IrO2 hybrid electrode significantly enhanced the fatigue properties with minimal leakage current.