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644 results on '"Xi, Lixia"'

1. Magnetron Sputtered Non-Toxic and Precious Element-Free Ti-Zr-Ge Metallic Glass Nanofilms with Enhanced Biocorrosion Resistance

Author

Sarac, Baran, Micusik, Matej, Putz, Barbara, Wurster, Stefan, Sharifikolouei, Elham, Xi, Lixia, Omastova, Maria, Spieckermann, Florian, Mitterer, Christian, and Eckert, Jürgen

Subjects
Condensed Matter - Materials Science
Abstract

The chemical composition and structural state of advanced alloys are the decisive factors in optimum biomedical performance. This contribution presents unique Ti-Zr-Ge metallic glass thin-film compositions fabricated by magnetron sputter deposition targeted for nanocoatings for biofouling prevention. The amorphous nanofilms with nanoscale roughness exhibit a large relaxation and supercooled liquid regions as revealed by flash differential scanning calorimetry. Ti\textsubscript{68}Zr\textsubscript{8}Ge\textsubscript{24} shows the lowest corrosion (0.17 \textmu A cm\textsuperscript{\textminus2}) and passivation (1.22 \textmu A cm\textsuperscript{\textminus2}) current densities, with the lowest corrosion potential of \textminus0.648 V and long-range stability against pitting, corroborating its excellent performance in phosphate buffer solution at 37 {\textdegree}C. The oxide layer is comprised of TiO\textsubscript{2}, TiO\textsubscript{\emph{x}} and ZrO\textsubscript{\emph{x}}, as determined using X-ray photoelectron spectroscopy by short-term ion-etching of the surface layer. The two orders of magnitude increase in the oxide and interface resistance (from 14 to 1257 {\textOmega} cm\textsuperscript{2}) along with an order of magnitude decrease in the capacitance parameter of the oxide interface (from 1.402 x 10\textsuperscript{\textminus5} to 1.677 x 10\textsuperscript{\textminus6} S s\textsuperscript{n} cm\textsuperscript{\textminus2}) of the same composition is linked to the formation of carbonyl groups and reduction of the native oxide layer during linear sweep voltammetry., Comment: 34 Pages, 5 Figures, 4 Tables, 13 Supplementary Figures

Published
2022
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5. Identifying modulation formats using integrated clustering algorithm

Author

Zhang, Wenbo, Ye, Jinmei, Yue, Zixian, Wang, Yuxiang, Zhang, Xulun, Zhang, Xiaoguang, and Xi, Lixia

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

Modulation format identification (MFI) is crucial in next-generation optical networks such as cognitive optical networks. An integrated-clustering-algorithm-based MFI scheme in a coherent optical communication system is proposed herein. Numerical simulations are performed to test the performance of the scheme on the platform of a polarization domain multiplexing system at a symbol rate of 28 Gbaud. Simulations show that the MFI scheme can achieve an accuracy of 100% for five modulation formats considered in this study when the optical signal-to-noise ratio values are lower than the 7% forward error correction threshold. Tolerances to residual chromatic dispersion (CD) are discussed, and the results show that the proposed scheme can perform well as the residual CD changes over a wide range of values. Moreover, by selecting a number of key blocks, the proposed scheme is less complex than other clustering-based MFI schemes.

Published
2021

6. Features, Limitations, Applications

Author

Gu, Dongdong, Xi, Lixia, Wang, Ruiqi, Liu, He, Merkle, Dieter, Managing Editor, Pei, Eujin, editor, Bernard, Alain, editor, Gu, Dongdong, editor, Klahn, Christoph, editor, Monzón, Mario, editor, Petersen, Maren, editor, and Sun, Tao, editor

Published
2023
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7. Role of angular velocity on Marangoni convection shifting, heat accumulation, and microstructure evolution using laser directed energy deposition.

Author

Dai, Donghua, Li, Yanze, Gu, Dongdong, Zhao, Wentai, Long, Yuhang, Shi, Xinyu, Zhang, Han, Lin, Kaijie, and Xi, Lixia

Subjects
MARANGONI effect, ANGULAR velocity, RAYLEIGH number, TANGENTIAL force, PECLET number, HEAT transfer
Abstract

In this study, laser Directed Energy Deposition technology is employed to fabricate internal structures within the hollow interiors of rotating parts such as tubes and cylinders. A three-dimensional transient multiphysics model for C276 material was developed, which anticipated the impact of angular velocity from tube rotation on various aspects. This model, validated by experiments, focused on the melt pool morphology, Marangoni convection, oriented crystal microevolution, and deposited material microhardness. It was found that at 150 ms deposition, the dimensions of the melt pool stabilized. With an increase in the Peclet number, heat transfer within the melt pool transitioned from conduction to convection. A rise in angular velocity reduced the melt pool deposition height, limited by the volume of the deposited material. Additionally, this angular velocity generated tangential forces, leading to an asymmetric melt distribution in the longitudinal section of the melt pool and a movement of the melt toward the melting front. At the bottom of the melt pool, the growth of C276 columnar crystals was notably inclined toward the center of Marangoni convection. The microhardness of the deposited material showed a stable distribution along the inclined crystal direction, whereas significant fluctuations were observed perpendicular to the cylinder substrate. These findings highlighted the considerable effect of Marangoni convection on microstructural evolution. [ABSTRACT FROM AUTHOR]

Published
2024
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8. A Effective Carrier Phase Recovery Method in Tigth Time-Packing Fast than Nyquist Optical Communication System

Author

Sun, Peng, Zhang, Xiaoguang, Pan, Dongwei, Xi, Lixia, Zhang, Wenbo, and Tang, Xianfeng

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

We propose a new scheme that combines polybinary transformaton and corrected-BPS to compensate noise for PDM-FTN-QPSK when its accelerated factor is 0.5,which has 3.3 dB OSNR gain when phase noise is 800 kHz., Comment: 2 pages,6 figures,CLEO PR 2020(Conference)

Published
2020

9. Faster-than-Nyquist Nonlinear Frequency Division Multiplexing System

Author

Zhang, Xulun, Xi, Lixia, Sun, Peng, Zheng, Zibo, Wei, Jiacheng, Wu, Yue, Du, Shucheng, and Zhang, Xiaoguang

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

The faster-than-Nyquist nonlinear frequency division multiplexing system was first proposed, which provided 12.5% and 25% increase in spectral efficiency for the compression factor of 0.89 and 0.8 respectively., Comment: submitted to Optical Networking and Communication Conference & Exhibition (OFC) 2020

Published
2019

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