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839 results on '"Chen, Wei‐Feng"'

26. Comparative Simulation for Nonlinear Effect of Hybrid Optical Fiber-Links in High-Speed WDM Systems

Author

Dai, Zhan-Heng, Chen, Wei-Feng, Li, Li-Min, Ma, Ruo-Fei, Li, Bo, Liu, Gongliang, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Wang, Wei, editor, Liu, Xin, editor, Na, Zhenyu, editor, Jia, Min, editor, and Zhang, Baoju, editor

Published
2020
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30. Sr2[B5O8(OH)]2 ⋅ [B(OH)3] ⋅ H2O: A Strontium Borate That Shows Deep‐Ultraviolet‐Transparent Nonlinear Optical Properties.

Author

Chen, Wei‐Feng, Lu, Jing‐Yi, Li, Jing‐Jing, Lan, You‐Zhao, Cheng, Jian‐Wen, and Yang, Guo‐Yu

Subjects
*STRONTIUM, *OPTICAL properties, *BORATES, *DENSITY functional theory, *NONLINEAR optical spectroscopy
Abstract

A new noncentrosymmetric strontium borate, P1‐Sr2[B5O8(OH)]2 ⋅ [B(OH)3] ⋅ H2O (1), has been synthesized under the hydrothermal condition. The P1‐Sr2[B5O8(OH)]2 ⋅ [B(OH)3] ⋅ H2O shows a layered B−O network with 9‐ring windows in the ab plane. Sr2+ cations, H3BO3, and H2O molecules are located in the voids of layers and interlayers, respectively. The P1‐Sr2[B5O8(OH)]2 ⋅ [B(OH)3] ⋅ H2O is the first synthetic phase of veatchite, while the other three polymorphs are found in different natural minerals. This strontium borate is a potential deep‐ultraviolet‐transparent nonlinear‐optical (NLO) crystal whose second‐harmonic‐generation (SHG) intensity is 1.7 times that of KH2PO4 (KDP) and is phase‐matchable. The short wavelength cutoff edge of compound 1 is below 190 nm. Density functional theory (DFT) calculations show that the B−O units are responsible for the nonlinear optical property. [ABSTRACT FROM AUTHOR]

Published
2024
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40. M6[Cd2(CO3)2(B12O18)(OH)6] (M = K, Rb): Borate–Carbonates with Two CdCO3Embedded in a Cyclic Oxoboron Anion

Author

Chen, Wei-Feng, Zou, Mei-Jun, Li, Jing-Jing, Zhang, Yi-Nan, Lan, You-Zhao, Cheng, Jian-Wen, and Yang, Guo-Yu

Abstract

Two metal borate–carbonates, M6[Cd2(CO3)2(B12O18)(OH)6] [M = K (1), Rb (2)], were obtained under surfactant-thermal conditions. In 1and 2, each cyclic [(B12O18)(OH)6]6–anion captures two CdCO3in two sides of the rings and finally forms the unusual (CdCO3)2@[(B12O18)(OH)6] cluster. Both 1and 2show moderate birefringence. Density functional theory calculations indicate that carbonate groups have a major contribution to electron-related optical transition.

Published
2024
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41. Feasibility and safety of endoscopic resection for the jejunoileal lesions.

Author

Wang, Li, Liu, Zu‐Qiang, Zhang, Ji‐Yuan, Li, Quan‐Lin, Chen, Shi‐Yao, Zhong, Yun‐Shi, Zhang, Yi‐Qun, Chen, Wei‐Feng, Qin, Wen‐Zheng, Hu, Jian‐Wei, Cai, Ming‐Yan, Yao, Li‐Qing, Ma, Li‐Li, and Zhou, Ping‐Hong

Subjects
ENDOSCOPIC surgery, JEJUNUM, ILEUM, COLONOSCOPY, ENTEROSCOPY
Abstract

Background: Endoscopic resection (ER) for jejunoileal lesions (JILs) has been technically challenging. We aimed to characterize the clinicopathologic characteristics, feasibility, and safety of ER for JILs. Method: We retrospectively investigated 52 patients with JILs who underwent ER from January 2012 to February 2022. We collected and analyzed clinicopathological characteristics, procedure‐related parameters, outcomes, and follow‐up data. Results: The mean age was 49.4 years. Of the 52 JILs, 33 ileal tumors within 20 cm from the ileocecal valve were resected with colonoscopy, while 19 tumors in the jejunum or the ileum over 20 cm from the ileocecal valve received enteroscopy resection. The mean procedure duration was 49.0 min. The en bloc resection and en bloc with R0 resection rates were 86.5% and 84.6%, respectively. Adverse events (AEs) included one (1.9%) major AE (delayed bleeding) and five (9.6%) minor AEs. During a median follow‐up of 36.5 months, two patients had local recurrence (3.8%), while none had metastases. The 5‐year recurrence‐free survival (RFS) and disease‐specific survival (DSS) were 92.9% and 94.1%, respectively. Compared with the enteroscopy group, overall AEs were significantly lower in the colonoscopy group (P < 0.05), but no statistical differences were observed in RFS (P = 0.412) and DSS (P = 0.579). There were no significant differences in AEs, RFS, and DSS between the endoscopic submucosal dissection (ESD) and the endoscopic mucosal resection (EMR) group. Conclusions: ER of JILs has favorable short‐term and long‐term outcomes. Both ESD and EMR can safely and effectively resect JILs in appropriately selected cases. [ABSTRACT FROM AUTHOR]

Published
2024
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42. Management of delayed bleeding of upper gastrointestinal endoscopic submucosal tunneling procedures: a retrospective single‐center analysis and brief meta‐analysis

Author

Wang, Li, primary, Liu, Zu‐Qiang, additional, Zhang, Ji‐Yuan, additional, Chen, Shi‐Yao, additional, Zhong, Yun‐Shi, additional, Zhang, Yi‐Qun, additional, Chen, Wei‐Feng, additional, Ma, Li‐Li, additional, Qin, Wen‐Zheng, additional, Hu, Jian‐Wei, additional, Cai, Ming‐Yan, additional, Yao, Li‐Qing, additional, Li, Quan‐Lin, additional, and Zhou, Ping‐Hong, additional

Published
2023
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