http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
임펠러 Ti6Al4V 미세조직에 따른 초고주기 피로거동 평가
김종민(JongMin Kim),강정우(JeongWoo Kang),조인식(InSik Cho) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
As the industry develops, there is a need for research on durability and reliability in addition to the high efficiency of the core parts of the machine, and the limit also requires a very long time. For example, turbo-type fluid machines, such as aircraft fans / compressors and space rocket propellant turbo pumps, demand a prediction of material properties life over ultra-high cycle cycles. As an Accelerated Fatigue Testing technology, the Time Saving Method of several tens of kHz, which can drastically reduce the application period of new processes and new materials, is attracting attention as an alternative. Therefore, in this study, we tried to compare mechanical properties and ultrasound fatigue test according to Ti6Al4V microstructure of the main material of 100 horsepower impeller parts.
채현영(HyunYoung Chae),정옥미(Ok-Mi Jeong),허문(Moon Her),강정우(JeongWoo Kang) 한국예방수의학회 2021 예방수의학회지 Vol.45 No.4
The objective of this study was to develop a simultaneous method for 8 amino acids including alanine, arginine, glutathione, lysine, ornithine, methionine, threonine and tryptophan in veterinary products using LC-MS/MS. To optimize MS analytical condition of 8 amino acids, each parameter was established by multiple reaction monitoring in positive mode. The chromatogram separation was achieved on a C18 column with mobile phase of 0.1% formic acid in D.W. and 0.1% formic acid in acetonitrile for green technology at a flow rate of 0.4mL/min for 5 min with gradient elution. The developed method was validated for mass accuracy, precision, linearity in veterinary products. Calibration curves were linear over the calibration ranges (0.5 - 10 mg/L) for all the analytes r2>0.99. Average recoveries were 92.96 - 105.61% and relative standard deviations (RSD) were 0.27 - 3.5%. The limit of detection (LOD) and the limit of quantification (LOQ) were 0.04 - 0.83 mg/L and 0.12 - 2.52 mg/L, respectively. All values were corresponded with the criteria ranges requested by CD 2002/657/EC. The application of this method will be helpful in quality control analysis of amino acids in veterinary products.