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Chemical Vapor Deposition Growth of Graphene Domains Across the Cu Grain Boundaries
Yang Wang,Yu Cheng,Yunlu Wang,Shuai Zhang,Chen Xu,Xuewei Zhang,Miao Wang,Yang Xia,Qunyang Li,Pei Zhao,Hongtao Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.08
Many aspects in the chemical vapor deposition (CVD) growth of graphene remain unclear such as its behavior near the catalyst grain boundaries. Here we investigate the CVD growth mechanism of graphene across the Cu grain boundaries using unidirectional aligned graphene domains, which simplifies the analysis of both graphene and Cu to a large extent. We found that for a graphene domain grown across the Cu grain boundary, the domain orientation is determined by the Cu grain where the domain nucleation center is located, and the Cu grain boundary will not change the growth behavior for this graphene domain. This growth mechanism is consistent with the Custep-attached nucleation and edge-attachment-limited growth mechanism for H-terminated graphene domains and will provide more guidance for the synthesis of high-quality graphene with less domain boundaries.
Yu-Shuai Wang,Yin-Ping Jin,Wei Gao,Sheng-Yuan Xiao,Yu-Wei Zhang,Pei-He Zheng,Jia Wang,Jun-Xia Liu,Cheng-He Sun,Ying-Ping Wang 고려인삼학회 2016 Journal of Ginseng Research Vol.40 No.3
Background: Ginsenosides are the major effective ingredients responsible for the pharmacological effects of ginseng. Malonyl ginsenosides are natural ginsenosides that contain a malonyl group attached to a glucose unit of the corresponding neutral ginsenosides. Methods: Medium-pressure liquid chromatography and semipreparative high-performance liquid chromatography were used to isolate purified compounds and their structures determined by extensive one-dimensional- and two-dimensional nuclear magnetic resonance (NMR) experiments. Results: A new saponin, namely malonyl-ginsenoside Re, was isolated from the fresh flower buds of Panax ginseng, along with malonyl-ginsenosides Rb1, Rb2, Rc, Rd. Some assignments for previously published ¹H- and <SUP>13</SUP>C-NMR spectra were found to be inaccurate. Conclusion: This study reports the complete NMR assignment of malonyl-ginsenoside Re, Rb₁, Rb₂, Rc, and Rd for the first time.
Remote Sensing Image Fusion Based On IHS and Dual Tree Compactly Supported Shearlet Transform
Chang Duan,Qihong Huang,Xuegang Wang,Shuai Wang,Hong Wang 보안공학연구지원센터 2014 International Journal of Signal Processing, Image Vol.7 No.5
This paper presents a novel remote sensing image fusion algorithm, which implements the intensity-hue-saturation (IHS) transform on panchromatic sharpening of multispectral data and the dual-tree compactly supported shearlet transform (DT CSST) during fusion. Shearlet transforms can provide almost optimal representation of the anisotropic features of an image. The spatial domain discrete implementation, the compactly supported shearlet transform (CSST), which represents the directions by dilation operations, are selected in the proposed fusion method. Since most of the prominent features of images, such as edges and regions, have limited sizes in the spatial domain, CSST is very suitable for image fusion. However, the conventional CSST is shift-variant, which causes distortions in fused images. With the embedded dual-tree (DT) sturcture in the CSST, the shift-variant properties can be effectively reduced. Combining the IHS transform and the DT CSST, an effective panchromatic and multispectral image fusion method is proposed in this paper. The experiments’ results suggest that the proposed method extract more spatial information from panchromatic images with less lost in spectral consistency compared to other fusion methods which are based on discrete wavelet transform (DWT), à trous wavelet transform, à trous shearlet transform, the dual-tree complex wave transform ( DT CWT), or the Curvelet transform.
Non-Fixed Investment in Voluntary Public Goods Games
Shuai Wang,Zhaojin Xu,Lianzhong Zhang 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.9
In this work, we introduce a non-fixed investment ratio to the public goods games in which players can determine whether or not to participate and how much money to invest into the common pool, and with it a new mechanism has been established. We explicitly demonstrate a different rockscissors- paper dynamics which is a consequence of this model. Meanwhile, it is shown how the mechanism of non-fixed investment ratio in uences the players' decision. In addition, we found that the length of memory has an important effect on the average payoff of the population by this introduction.
Wang Shuai,Zheng Xiaolei,Wang Jin,Yang Jianzhi 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.6
The radioactive pollutant could migrate to the downstream urban area under the action of atmospheric dispersion due to the turbulent mixing under actual pollution accidents. A scenario in which radioactive contaminants from the upstream (for example, a nearshore nuclear power plant accident) migrates to the downstream urban blocks have been considered in this study. Numerical simulations using computational fluid dynamics (CFD) are then conducted to investigate the effects of the urban morphology (building packing density and layout) on the atmospheric dispersion of radioactive pollutants in this scenario. The building packing density and structure can significantly affect urban areas’ mean flow pattern and the turbulent kinetic energy (TKE). The flow pattern and the TKE distribution influence the radioactive pollution dispersion. It is found that the radioactive pollution at the urban canyons is significantly affected by the vertical transport at the canyon. A comparison of the distributions of radioactive and traditional non-radioactive pollutants is also provided
Shuai Gao,Min Wang,Jian‑long Guo,Hao Wang,Jian‑guo Zhi,Yan‑ping Bao 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
The TiN–MnS complex inclusions in Al-killed titanium alloyed interstitial free steel were extracted from the slabs using anelectrolytic aqueous solution method. Scanning electron microscopy with energy spectroscopy analysis and an automaticscanning electron microscope were employed to analyze the size and distribution of TiN–MnS inclusions in the thicknessdirection of the slab. It was found that TiN–MnS complex inclusions were primarily concentrated in the 1/4 thickness directionfrom the inner and outer surfaces, and the size of the complex inclusions in the slab center was approximately 8 μm.TiN began to precipitate when the solidification rate reached 0.646–0.680 in the δ phase, and MnS would appear in the γphase when the solidification rate exceeded 0.450 through thermodynamic analysis. Also, the formation mechanism of thecomplex TiN–MnS was investigated under a crystal structure during solidification.
( Shuai Zhang ),( Xiao Ren ),( Yanzhang Wang ),( Yongdi Wang ) 아시아스포츠융합과학회 2022 Asia Pacific Journal of Applied Sport Sciences Vol.3 No.1
PURPOSE This study used a sporting goods goal-oriented behavior model (SG-MGB) to predict and test consumers' behavioral intentions for purchasing sporting goods online. Based on the original MGB, the study added three constructs related to online consumption, and examined the factors that influence the online consumer's consumption decision-making process. METHOD A conceptual model containing 13 hypotheses was empirically tested using data from 271 Shanghai residents who have purchased sports goods online in the past 12 months. RESULT The results showed that consumers' positive anticipated emotion, negative anticipated emotion, past behavior frequency, and brand image all positively affected desire. Desire had the most significant positive effect on behavioral intention. Desire played a positive mediating role. CONCLUSION The study found that brand image is an important variable that affects consumers' willingness to buy sports goods online. The SG-MGB is a strong predictive model for online consumers' behavioral intentions.
Shuai Liu,Jie Bai,Qian Wang,Wei Wang 한국항공우주학회 2019 International Journal of Aeronautical and Space Sc Vol.20 No.3
A multi-power reaching law of sliding mode control is applied to aero-engine control, for which the tracking controller is designed based on sliding mode control. An improved multi-power reaching law of sliding mode control is proposed in this paper, which aims at reducing high-frequency oscillation phenomenon appeared in multi-power tracking control process of aero-engine. The proposed reaching law is used in a simulation of an aero-engine control system, whose results show that the proposed reaching law is applicable for tracking control of aero-engine. Not only does the proposed reaching law has these advantages that are fast response speed and strong robustness but also it can inhibit high-frequency oscillation phenomenon. The proposed reaching law is also used in aero-engine controller experiment. The improved multiple reaching law of sliding mode is suitable for tracking control for aero-engine.