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- 저자 : Saisai Yu (검색결과 2 건)
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Saisai Duan,Wei Wang,Chenglei Yu,Mengjie Liu,Longyu Yu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.5
A practical sensor based on a glassy carbon electrode (GCE) modified with exfoliated graphene (GR) and poly (3,4-ethylenedioxythiophene): poly (styrene sulfonate) (PEDOT:PSS) was prepared to determine L-tryptophan (L-Trp) via differential pulse voltammetry (DPV). Optical microscopy was utilized to characterize the surface morphology of the composite electrode. Electrochemical behaviors of the composite electrodes were carried out via cyclic voltammetry (CV). According to DPV results, there are linear relationships between the peak currents and the concentrations in the ranges of 0.1–100 μmol L -1 and 100–1000 μmol L -1 for L-Trp, with the detection limit of 0.015 μmol L -1 for L-Trp. Moreover, the modified electrode can eliminate the interference effects of Ca2+, Mg2+, K+, Na+, L-tyrosine and ascorbic acid, which exhibit excellent stability and reproducibility.
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Mechanical Properties of Steel Strands Cooled by Different Methods After High-Temperature Treatment
Long Liu,Lifeng Wang,Saisai Yu,Min Li 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.1
To study the mechanical properties of steel strands cooled by water at diff erent temperatures after high-temperature treatment, a two-stage experiment was conducted. First, tensile tests of 1860-grade steel wire specimens were conducted after heating to diff erent peak temperatures using 15 °C water and air for cooling. After that, tensile tests of steel strand specimens with the same heating temperature and diff erent cooling temperatures of water were conducted. The results showed that the ultimate strength of the steel wire fi rst decreased and then increased with increasing heating temperature under the air cooling method but decreased continuously under the water cooling method, which is in agreement with previous research results. The ultimate strength of the steel strands increased as a polynomial function of increasing cooling water temperature until the heating temperature reached 1000 °C. When the temperature of the cooling water increased from 10 to 80 °C, the stress increased from 19.61 to 139.88 MPa, while the stress increased sharply from 39.56 to 106.57 MPa as the temperature increased from 50 to 60 °C. The stress–strain relationship of steel strands cooled by water at diff erent temperatures was also studied. This study may provide a basis for the damage assessment of steel strands after fi re-related accidents.
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