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Causal analysis of natural gas station pipelines vibration and reduction measures
Wenwu Yang,Xin Li,Yuhan Tao,Kang Cen,Yunqiao Wen 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.9
The existing studies on the strong vibration problem of the outbound process pipeline of a natural gas transfer station focus on the pipeline process with a compressor. This work proposes a structural innovation to eliminate the pipeline vibration without compressor by experiment and numerical simulation. A simulation model was established based on the physical dimensions. Hammer test and finite element method validated the proposed model for natural gas stations pipelines. It was found that in branch 1 and 2 occur the first two coupled modes. In addition, three kinds of vibration reduction schemes, such as increasing sleeve and increasing pipe diameter, are proposed to increase the pipe rigidity and reduce the excitation force to control the vibration. It is revealed that adding sleeves to the branch pipes 1 and 2 can better suppress pipe vibration by referring to related evaluation standards. This case shows that performing variable-condition vibration testing and spectrum characteristics analysis of pipelines can easily reveal the main vibration sources and provide solutions for pipeline vibration reduction treatment.
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Deep Learning-Based Modulation Detection for NOMA Systems
( Wenwu Xie ),( Jian Xiao ),( Jinxia Yang ),( Ji Wang ),( Xin Peng ),( Chao Yu ),( Peng Zhu ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.2
Since the signal with strong power need be demodulated first for successive interference cancellation (SIC) receiver in non-orthogonal multiple access (NOMA) systems, the base station (BS) need inform the near user terminal (UT), which has allocated higher power, of the far UT’s modulation mode. To avoid unnecessary signaling overhead of control channel, a blind detection algorithm of NOMA signal modulation mode is designed in this paper. Taking the joint constellation density diagrams of NOMA signal as the detection features, the deep residual network is built for classification, so as to detect the modulation mode of NOMA signal. In view of the fact that the joint constellation diagrams are easily polluted by high intensity noise and lose their real distribution pattern, the wavelet denoising method is adopted to improve the quality of constellations. The simulation results represent that the proposed algorithm can achieve satisfactory detection accuracy in NOMA systems. In addition, the factors affecting the recognition performance are also verified and analyzed.
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Thin-film electronics based on all-2D van der Waals heterostructures
Liu Xinling,Yang Xiaomin,Sang Weihui,Huang Hai,Li Wenwu,Lin Yen-Fu,Chu Junhao 한국정보디스플레이학회 2021 Journal of information display Vol.22 No.4
Two-dimensional (2D) layered materials including metal, semiconductor, and insulator have received extensive attention in recent years. The weak van-der-Waals (vdW) interactions between 2D materials layers enable them to isolate monolayers and restack into artificial 2D vdW heterostructures in the desired sequence. These assembled all-2D vdW heterostructures are promising platforms for fabricating next-generation electronics as well as optoelectronics. In particular, the all-2D vdW heterostructure devices composed entirely of 2D layered material have received extensive attention due to their natural thickness, atomically sharp heterointerfaces, and excellent mechanical flexibility. Herein, we firstly introduce 2D vdW heterostructures and their preparation methods. Secondly, the recent progress of field-effect transistors (FETs) and photodetectors based on all-2D vdW heterostructures are summarized. Finally, we discuss some challenges of all-2D vdW heterostructure-based devices for practical applications and offer personal perspectives toward the future development of thin-film electronics.
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Aziguli Yigaimu,Turghun Muhammad,Wenwu Yang,Imran Muhammad,Muyasier Wubulikasimu,Sergey A. Piletsky 한국고분자학회 2019 Macromolecular Research Vol.27 No.11
In this work, magnetic molecularly imprinted polymers (MMIPs) were prepared by the method of co-precipitation polymerization on the surface of vinylmodified silica magnetic particles. Here, 4-nitrophenol (4-NP) was used as a template and vinylimidazole as a functional monomer. The structural features and morphology of MMIPs were characterized by SEM, FT-IR, TEM and XRD techniques. The results showed that the structures of MMIPs have a layer of silica and MIPs on the surface of the Fe3O4 particles, and they could be rapidly separated from the solution using a magnet. MMIPs possess higher adsorption capacity and excellent selectivity towards template (4-NP) than other structural analogues. And it is found to have good imprinting effect. MMIPs were used as micro-solid phase extraction sorbent for selective separation of 4-NP in lake water sample with high recoveries (90.63-95.63%) and low relative standard deviation values (RSD ≤ 3.2%, n = 3).
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Synthesis of Carbon Dots from PEG6000 and Papain for Fluorescent and Doxycycline Sensing
Yuanjiao Feng,Lihong Tan,Qian Tang,Wenwu Zhong,Xiaoming Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.09
Herein, a simple-green road for preparing carbon dots (CDs) from the mixture of PEG6000 and papain with approving fluorescence has been successfully developed for the first time. Meanwhile, the current CDs were characterized by analytical means such as fluorescence, UV visible spectrophotometer, HR-TEM, XPS and FTIR and so on. Afterwards, this kind of CDs were employed for analyzing doxycycline (DC) relying on the mechanism that the functional group of DC had interactions with CDs, hence, leading to the fluorescence quenching. Also, this DC analytical method mentioned here permitted in a linear range of 5.0 x 10 -8 mol/L - 5.0 x 10 -4 mol/L as well as a detection limit of 18nM at a signal-to-noise ratio (S/N) of 3. More importantly, the CDs prepared here were still explored for milk real samples, indicating their potential for broadening avenues towards other various applications.
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