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Research of Nano-modified Plain Cement Concrete Mixtures and Cement-Based Concrete
Shilin Yang,Andrii Bieliatynskyi,Viacheslav Trachevskyi,Meiyu Shao,Mingyang Ta 한국콘크리트학회 2023 International Journal of Concrete Structures and M Vol.17 No.6
The use of complex modifiers for plain cement concrete mixtures and concrete is becoming increasingly popular in modern materials science. The article presents studies of the influence of a polymer additive structured by carbon nanomaterials on physical and mechanical characteristics of plain cement concrete mixtures. IR spectroscopy and thermogravimetry have shown that the use of carbon nanomaterials significantly altered the structure of plain cement concrete mixtures. As a result of the fact that the high-strength nanomaterial is the center of crystallization of cement rock newly formed structures, a denser reinforced microstructure is formed, which significantly increases the strength properties of plain cement concrete mixtures. The inclusion of a polymer complex additive in plain cement concrete mixtures leads to higher and longer plasticizing, which plays an important role in the production of monolithic products. It was determined that, in the presence of a complex modifier (polymer additive structured by carbon nanotubes), the crystalline structure of calcium hydrosilicates is compacted, which causes high physical and mechanical characteristics of modified plain cement concrete mixtures. It has been experimentally shown that the additive Ethacryl HF (France) from the class of polycarboxylates, chosen for research, acts as an accelerator for setting and curing cement paste, and also increases its strength characteristics. In general, in this study, there is a water-reducing effect from the application of the additive for all plain cement concrete mixtures. Water requirements are reduced by 5 mas. %, while the strength is increased by 19%. The formulation of plain cement concrete mixtures modified by polymer additives, structured by carbon nanotubes, with high performance were developed.
The Motivation, Characteristics, and Development Prospects of e-Commerce in China
Liuyong Yang,Shilin Yang,Jing Li,Xinyi Xiang 중앙대학교 한국전자무역연구소 2017 전자무역연구 Vol.15 No.1
Purpose: 본 논문의 목적은 중국 전자상거래의 발생, 다양한 발전원인, 특징, 발전 전망에 대해 분석정리하고, Alibaba 사례를 중심으로 중국 전자상거래의 현주소와 미래 발전방향을 제시함에 있다. Composition/Logic: 본 논문의 구성은 다음과 같다. 제1장은 서론이며, 제2장은 중국전자상거래의 다양한 발전원인에 대해 언급한다. 제3장은 중국 전자상거래의 현황과특징에 대해 소개하며, 제 4장은 중국 전자상거래의 발전 전망에 대해 분석한다. 제 5장은 결론이다. Findings: 본 논문은 중국 전자상거래에 대한 발전원인과 현황 및 특징, 마지막으로 발전전망에 대해 언급하였으며 향후 발전방향에 대해 다음과 같은 세 가지로 요약면(1) 빅데이터와 클라우드 컴퓨팅 전략 (2) 농촌 전자상거래 전략 (3) 글로벌 전략이다. 중국의 위와 같은 전략을 통해 한국에 미치는 시사점을 유추해 볼 수 있다. Originality/Value: 본 논문은 중국 전자상거래 발전원인과 특징, 발전전망에 대해 주로 알리바바를 중심으로 분석하였다. 특히 발전방향에 대해 자세하게 제시하여 한국에 미치는 시사점을 유추해 볼 수 있다는 데에 그 의의가 있다. Purpose: This study examines the origin, dynamic motivation, characteristics, and development prospects of e-commerce in China, and focusing on the case of Alibaba, suggests directions for development. Composition/Logic: This paper is structured as follows: The first section provides the introduction. The second section considers the various motivating factors behind the development of e-commerce in China. The third section discusses the current situation and characteristics of China s e-commerce. The fourth section analyzes China s e-commerce development prospects. The final section concludes. Findings: This study suggests three development directions for further progression of the Chinese e-commerce trend: (i) Big data and cloud computing strategy; (ii) rural strategy; and (iii) globalization strategy. The implications for Korea can be inferred from the above strategies. Originality/Value: This study contributes by presenting an analysis on the origin, prospects, and characteristics of e-commerce in China, with a focus on Alibaba. In particular, this study offers detailed directions for development that could have implications on Korea.
Wei, Guangfei,Yang, Feng,Wei, Fugang,Zhang, Lianjuan,Gao, Ying,Qian, Jun,Chen, Zhongjian,Jia, Zhengwei,Wang, Yong,Su, He,Dong, Linlin,Xu, Jiang,Chen, Shilin The Korean Society of Ginseng 2020 Journal of Ginseng Research Vol.44 No.6
Background: Panax quinquefolius and Panax notoginseng are widely used and well known for their pharmacological effects. As main pharmacological components, saponins have different distribution patterns in the root tissues of Panax plants. Methods: In this study, the representative ginsenosides were detected and quantified by desorption electrospray ionization mass spectrometry and high-performance liquid chromatography analysis to demonstrate saponin distribution in the root tissues of P. quinquefolius and P. notoginseng, and saponin metabolite profiles were analyzed by metabolomes to obtain the biomarkers of different root tissues. Finally, the transcriptome analysis was performed to demonstrate the molecular mechanisms of saponin distribution by gene profiles. Results: There was saponin distribution in the root tissues differed between P. quinquefolius and P. notoginseng. Eight-eight and 24 potential biomarkers were detected by metabolome analysis, and a total of 340 and 122 transcripts involved in saponin synthesis that were positively correlated with the saponin contents (R > 0.6, P < 0.05) in the root tissues of P. quinquefolius and P. notoginseng, respectively. Among them, GDPS1, CYP51, CYP64, and UGT11 were significantly correlated with the contents of Rg1, Re, Rc, Rb2, and Rd in P. quinquefolius. UGT255 was markedly related to the content of R1; CYP74, CYP89, CYP100, CYP103, CYP109, and UGT190 were markedly correlated with the Rd content in P. notoginseng.
Bias process for heteroepitaxial diamond nucleation on Ir substrates
Wang Weihua,Yang Shilin,Liu Benjian,Hao Xiaobin,Han Jiecai,Dai Bing,Zhu Jiaqi 한국탄소학회 2023 Carbon Letters Vol.33 No.2
Heteroepitaxy is a better method of enlarging SCD wafer size than homoepitaxy. In this work, several aspects of the bias process for heteroepitaxial diamond nucleation are studied experimentally. First, with increasing bias time, the diamond-nucleation pathway is found to transform from “isolated-crystal nucleation” to “typical domain-nucleation” and back to “isolated-crystal nucleation.” An interdependent relationship between bias voltage and bias time is proposed: the higher the bias voltage, the shorter the bias time. Second, a correlation exists between the threshold bias voltage and reactor-chamber pressure: a higher reactor chamber pressure usually requires a higher threshold bias voltage to realize “typical domain nucleation.” Third, diamond bias-enhanced nucleation and growth is observed at a high CH4 content, where the dynamic equilibrium between amorphous-carbon-layer deposition and atomic-hydrogen etching is broken. Finally, epitaxial nucleation is obtained on a substrate with ∅30 mm in a home-made MPCVD setup.
GENERALIZED MCKAY QUIVERS, ROOT SYSTEM AND KAC-MOODY ALGEBRAS
Bo Hou,Shilin Yang 대한수학회 2015 대한수학회지 Vol.52 No.2
Let Q be a finite quiver and G ⊆ Aut(kQ) a finite abelian group. Assume that Q^ and T are the generalized Mckay quiver and the valued graph corresponding to (Q,G) respectively. In this paper we dis- cuss the relationship between indecomposable Q^ -representations and the root system of Kac-Moody algebra g(T). Moreover, we may lift G to G ⊆ Aut(g(Q^)) such that g(T) embeds into the fixed point algebra g(Q^)G and g(Q^)G as a g(T)-module is integrable.
WEAK HOPF ALGEBRAS CORRESPONDING TO NON-STANDARD QUANTUM GROUPS
Cheng, Cheng,Yang, Shilin Korean Mathematical Society 2017 대한수학회보 Vol.54 No.2
We construct a weak Hopf algebra $wX_q(A_1)$ corresponding to non-standard quantum group $X_q(A_1)$. The PBW basis of $wX_q(A_1)$ is described and all the highest weight modules of $wX_q(A_1)$ are classified. Finally we give the Clebsch-Gordan decomposition of the tensor product of two highest weight modules of $wX_q(A_1)$.