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446 results on '"Jeng C"'

31. Nonlocal dark solitons under competing cubic-quintic nonlinearities

Author

Chen, L, Wang, Q, Shen, M, Zhao, H, Lin, Y-Y, Jeng, C-C, Lee, R-K, Krolikowski, Wieslaw, Chen, L, Wang, Q, Shen, M, Zhao, H, Lin, Y-Y, Jeng, C-C, Lee, R-K, and Krolikowski, Wieslaw

Abstract

We investigate properties of dark solitons under competing nonlocal cubic-local quintic nonlinearities. Analytical results, based on a variational approach and confirmed by direct numerical simulations, reveal the existence of a unique dark soliton solutions with their width being independent of the degree of nonlocality, due to the competing cubic-quintic nonlinearities.

Published
2013

32. Stabilization of counter-rotating vortex pairs in nonlocal media

Author

Shen, M, Zheng, J J, Kong, Q, Lin, Y Y, Jeng, C C, Lee, Ray-Kuang, Krolikowski, Wieslaw, Shen, M, Zheng, J J, Kong, Q, Lin, Y Y, Jeng, C C, Lee, Ray-Kuang, and Krolikowski, Wieslaw

Abstract

The dynamics of vector vortex pairs with explicit and hidden vorticity in nonlocal media with an arbitrary degree of nonlocality is investigated analytically and numerically. We show that the stability dynamics of the vortex pairs depends crucially upon their total angular momentum, the topological charge, and the degree of nonlocality. In particular, we show that nonlocality eliminates the splitting of the vortex pairs, improves their propagation stability, and leads to formation of stationary bound states of vortex pairs.

Published
2012

43. Fixation of lung apex in spontaneous pneumothorax is safe and efficient in decrease recurrences

Author

Wendy Yang, Pei-Yeh Chang, Ai-Hua Yeh, Yung-Ching Ming, Jeng Chang Chen, and Jin-Yao Lai

Subjects
Pediatrics, RJ1-570
Abstract

Background: Video-assisted thoracoscopic bullectomy with pleurodesis is widely used to treat spontaneous pneumothorax. However, 1%–3% of patients experience postoperative complications that may require reoperation, such as bleeding or prolonged air leaks, and 3%–7% of patients require a repeat thoracoscopic bullectomy due to recurrence. Therefore, a modified procedure with improved outcomes is required. Methods: Between January 1, 2011 and December 31, 2015, 196 patients with spontaneous pneumothorax underwent thoracoscopic bullectomy and pleurodesis with or without fixation of the lung apex to the chest wall. In patients in the fixation group, the lung apex was fixed to the chest wall with two non-absorbable sutures after bullectomy and pleurodesis. The treatment of each lung was considered an independent operation in patients with bilateral spontaneous pneumothorax. Results: The patients in each group had comparable backgrounds. In the fixation group, 67 patients underwent 87 operations, four of which (in three patients) led to recurrences (recurrence rate, 4.60%). There were no readmissions or reoperations within 30 days in this group. In the non-fixation group, 128 patients underwent 161 operations, 14 of which (in nine patients) led to recurrences (recurrence rate, 8.7%). In addition, three patients in this group required reoperation and two were readmitted within 30 days. Conclusions: Modified thoracoscopic bullectomy with fixation of the lung apex is a safe procedure that provides better outcomes with lower complication rates. Key Words: spontaneous pneumothorax, thoracoscopic bullectomy, video-assisted thoracoscopic surgery (VATS), lung apex fixation

Published
2019
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