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307 results on '"Litao Zhang"'

302. GW26-e3876 D-dimer predicts all-cause mortality and cardiovascular events in Patients receiving warfarin treatment after went mechanical heart valve replacement

Author

Litao Zhang and Zhenlu Zhang

Subjects
medicine.medical_specialty, Mechanical heart valve replacement, business.industry, Internal medicine, D-dimer, medicine, Warfarin treatment, Cardiology, Observational study, In patient, business, Cardiology and Cardiovascular Medicine, All cause mortality
Abstract

The aim of the present research was to investigate whether D-dimer can predict all-cause mortality and cardiovascular events in patients suffered mechanical heart valve replacement (MHVR) during warfarin treatment. This was a prospective and observational study. 1163 Patients after going mechanical

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307. Study on Ge/GeSn double heterojunction vertical cavity surface emitting laser enabled by ultra‐injection technique.

Author

Lifeng, Zhang, Bin, Shu, Huiyong, Hu, Liming, Wang, Yvlong, Gao, Zehua, Wang, and Litao, Zhang

Subjects
*SURFACE emitting lasers, *HETEROJUNCTIONS
Abstract

A Ge/GeSn/Ge double heterojunction p‐i‐n vertical cavity surface emitting laser (VCSEL) is designed in this paper. According to the principle of distributed Bragg reflection (DBR), 6 and 12 pairs of SiO2/Si layers as the DBR are prepared on the upper and lower sides of the p‐i‐n structure. The upper and lower DBRs, as the resonant cavity of the laser, replace the Fabry Perot (FP) cavity of the conventional laser. The effects of Sn component and the ultra‐injection technique on the performance of the device are introduced at the same time to realize the direct bandgap luminescence of GeSn in the case of lower Sn component. The level of ultra‐injection is adjusted by changing the thickness of the i‐layer. The relationship between the thickness of the i‐layer and the carrier distribution after energization, the illuminating power, and the threshold current density are analyzed, and the best photoelectric performance is obtained. [ABSTRACT FROM AUTHOR]

Published
2019
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