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S. Y. Anaman,S. Ansah,M. G. Jo(조민구),J. Y. Suh(서진유),H. N. Han(한흥남),M. J. Kang(강민정),J. S. Lee(이종숙),S. T. Hong(홍성태),H. H. Cho(조훈휘) 한국소성가공학회 2021 한국소성가공학회 학술대회 논문집 Vol.2021 No.5
The electrochemical properties of a friction stir processed (FSPed) equiatomic CrMnFeCoNi high-entropy alloy (HEA) is investigated in an aerated 0.5 M Na<sub>2</sub>SO<sub>4</sub> electrolyte solution at room temperature. The microstructural analysis reveals a highly refined stir zone (SZ) with an average grain size that decreases from the top region of the SZ to the bottom region of the SZ (also known as shear processed zone; SPZ). However, the region below the SPZ, (i.e., below the plunge depth) experienced an increase in average grain size and dislocation densities compared to the other regions. There is no secondary phase observed in the FSPed region, however, the microstructural evolution in the FSPed region affects the electrochemical behavior of the HEA. Cr<sub>2</sub>O<sub>3</sub> passive layer is observed to form on the FSPed HEA leading to excellent corrosion properties from the polarization corrosion tests. Grain refinement in the SZ enhances the rapid formation of the passive layer, thus, leading to better corrosion properties in the front surface of the FSPed HEA. The localized corrosion behavior of the FSPed HEA is predicted to be caused by the micro-galvanic nature of the HEA, which leads to an increase in polarization at the anodic sites (pits). A numerical model is established using the corrosion parameters from the experiment to simulate the localized corrosion behavior on the surface of the FSPed HEA in a neutral environment. The predicted initial pitting potential and corresponding current density agree well with the experimental results. The model is also capable of tracking the dissolution of the pits over longer periods.
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Awareness and Use of Digital Reference Services in Academic Libraries in Ghana
Naomi Amofa Serwaa,Perpetua S. Dadzie,Christopher M. Owusu-Ansah 건국대학교 GLOCAL(글로컬)캠퍼스 지식콘텐츠연구소 2022 International Journal of Knowledge Content Develop Vol.12 No.-
The traditional reference service in academic libraries is gradually integrating digital modes of communication culminating in digital reference services (digital reference services). This study seeks to explore the extent to which digital reference services support user needs in academic libraries in Ghana. Specifically, the study was concerned with users’ awareness, preference and motivation for using digital reference services in three selected Academic Libraries in Ghana. Making use of a mixed-method research design, a total of 413 digital reference services users, 3 heads of university libraries, 3 heads of Information Technology (IT) and 7 digital reference services Librarians, from across three Academic Libraries, were selected to participate in the study. The results indicated that despite the utility of both, there was a preference for traditional reference in the three Academic Libraries. However, the use of digital reference services surged during quizzes, mid-semester examinations, interim assessments and end-of-semester examinations. With respect to the popularity of the various digital reference services platforms, users preferred email over other digital platforms. The results also indicated that the respondents used digital reference services when they were off-campus, while mobile phones were the most common digital tool for accessing digital reference services. Ultimately, digital reference services were found to considerably improve the use of library services. Implications of the results are discussed.
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