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Hong Khanh Dieu Nguyen,Toan Dang Nguyen,Dung Ngoc Hoang,Duc Sy Dao,Thao Tien Nguyen,Limphirat Wanwisa,Lan Linh Hoang 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.2
Hydrotalcite-like compound containing metal cations such as Mg2+, Al3+ and Ni2+ was characterized using Ni K-edge EXAFS and in situ Ni K-edge XANES techniques for clarifying its bonding environment around Ni2+ sites and structure changes during calcination from room temperature to 550 oC, respectively. At the fixed molar ratio of Mg/Ni/Al of 2/1/1, the results obtained from EXAFS analysis showed a slight blue shift before and after the calcination at 550 oC and a reduction in white line peak; the best fits of the two samples revealed tiny change in coordination number about 7 for Ni-O path but considerable difference for Ni-Mg(Al) path from about 4.5 to 9.5, confirming a modification from brucite like to mixed oxide structure. On the other hand, bond distances of the Ni-O and Ni-Mg paths nearly fixed at about 2.06 Å to 3.0 Å reflected stability of the cationic bond order on each plane, but partial collapse and decomposition of the interlayer formed by water molecules and anion CO3 2− after the calcination. Linear combination fit extracted from the in situ Ni K-edge XANES also confirmed the changes along with the calcination such as slow and fast decreases of brucite fraction at 150 oC and 330 oC, respectively, in corresponding to the mixed oxide fraction increases. The achieved bonding structures were also applied to explain acid-base occurrence of the hydrotalcite-like material, especially the acid sites generated by different static charges along with the bonds. The explanation was illustrated by NH3-TPD method.
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Energy Harvesting Protocol for Optimal Throughput in WLAN
Tan-Phuoc Huynh,Dinh-Thuan Do,Hoang-Sy Nguyen,Thanh-Dai Nguyen 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
In this paper, the time power switching based relaying (TPSR) protocol is proposed for energy harvesting (EH) enabled mobile node in WLAN. Specifically, we investigate how the time and power factors in EH protocol at relay mobile node affects on outage probability and throughput performance. Specifically, we develop outage and throughput performance characterizations in term of time and power factors in the proposed scheme. The tightness of our proposed protocol is determined through simulation results. We confirm that the optimal throughput is critically dependent on time switching and power splitting factor of the TPSR protocol.
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A Bibliometrics Analysis of Research on Early Childhood Education in 2022
Thi-Lam Bui,Lien – Kim Thi Tran,Thi-Tham Tran,Dung-Thi My Nguyen,Ben-Phạm,Hung-Sy Ho,Linh-Phuong Hoang,Anh-Duc Hoang The Pacific Early Childhood Education Research Ass 2024 Asia-Pacific journal of research in early childhoo Vol.18 No.2
Introduction Methodology Results Conclusion, Recommendations, and Future Research Directions This research aims to find the research focus and to highlight authors, journals, and documents on early childhood education (ECE) in 2022. This article analyzed a dataset with 1586 Clarivate Web of Science indexed articles on this topic, using descriptive, co-occurrence and thematic analyses. The authors applied the preferred reporting items for systematic reviews and meta-analyses (PRISMA) flow to comply with the dataset. Excel, the R program in the Biblioshiny package, and VOSviewer version 1.7 were used for the descriptive and bibliographic analyses. The findings of this paper demonstrate the remarkable contribution of researchers from the United States and China in terms of research quantity and impact, as well as their collaboration with different researchers. The findings revealed four topics: language and speech; programmes, policies and their impact on children and preschool teachers; behaviour of preschool children; the quality of ECE. In addition, we figured out the top influential authors and journals. This study provided an overview of research in ECE in 2022 and highlighted essential issues that need to be focused on by ECE researchers and practitioners.
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