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8 results on '"Duan, X. M."'

1. Quantum Effects of Strain Influence on the Doping Energy in Semiconductors

Author

Wang, Z. T., Chen, Shiyou, Duan, X. M., Sun, D. Y., and Gong, X. G.

Subjects
Condensed Matter - Materials Science
Abstract

Applying external strain is an efficient way to manipulate the site preference of dopants in semiconductors, however, the validity of the previous continuum elastic model for the strain influence on the doping forma- tion energy is still under debate. In this paper, by combining quantum mechanical theoretical analysis and first-principles calculations, we show that if the occupation change of different orbitals caused by the strain is negligible, the continuum elastic model is valid, otherwise it will fail. Our theory is confirmed by first-principles calculation of Mn-doped GaAs system. Moreover, we show that under compressive strain the hole density, thus the Curie temperature TC can increase in Mn-doped spintronic materials., Comment: 4 pages + 2 figures

Published
2011

6. Doubly Q-switched Ho:LuAG laser with acoustic-optic modulator and Cr^2+:ZnS saturable absorber

Author

Cui, Z., Duan, X. M., Yao, B. Q., Yang, H. Y., Li, J., Yuan, J. H., Dai, T. Y., Li, C. Y., and Pan, Y. B.

Abstract

A doubly Q-switched (DQS) Ho:LuAG laser resonantly pumped by a 1.91-μm laser was first presented with an acoustic-optic modulator (AOM) and a Cr^2+:ZnS saturable absorber. A comparison among the active Q-switched (AQS), passively Q-switched (PQS), and DQS laser performances was carried out. The maximum continuous wave (CW) output power of 6 W with the central wavelength of 2100.65 nm was obtained at an incident pump power of 35.2 W. Compared with CW laser, the AQS, PQS, and DQS lasers shared the same central wavelength of 2098.34 nm under the same incident pump power. The central wavelength of the AQS and DQS lasers remained constant with the change of AOM repetition frequency (RF). When the incident pump power was 35.2 W and the AOM RF was 15 kHz, the DQS Ho:LuAG laser at a maximum RF of 2.13 kHz achieved the maximum average output power of 4.95 W. At the AOM RF of 10 kHz, the DQS Ho:LuAG laser achieved the shortest pulse width of 40.4 ns with the highest peak power of 61.5 kW. At an incident pump power of 35.2 W, the PQS Ho:LuAG laser obtained the shortest pulse width of 46.1 ns, corresponding to the RF of 2.25 kHz. Experiment results showed that the pulse width could be compressed effectively with a significant increase of peak power for a 2-μm DQS laser.

Published
2015

8. [Gender differences of genetic etiology in the incidence of major depressive disorder among Han freshmen].

Author

Gao C, Luo LL, Yue S, Wang FT, Duan XM, Qian YD, Dong YJ, Li HY, Yue J, Xu RX, Liu Y, and Gong YD

Subjects
Asian People, Case-Control Studies, Female, Genetic Predisposition to Disease, Humans, Incidence, Male, Polymorphism, Single Nucleotide, Sex Factors, Depressive Disorder, Major epidemiology, Depressive Disorder, Major genetics
Abstract

Objective: To analyze the gender differences of genetic etiology in the incidence of major depression disorder among Han freshmen. Methods: A 1-year follow-up survey was carried out among 8 079 Han freshmen from Jining, Rizhao and Weifang without lifetime major depressive disorder (MDD) at baseline (April to October 2018) and 4 828 venous blood samples were also collected. After extracting DNA, Sequenom Mass Array time-of-flight mass spectrometry biochip technology was used to detect the genotypes of 17 single nucleotide polymorphisms (SNPs) MDD-related loci. Logistic regression was used for univariate analysis. Generalized multifactor dimension reduction was used to analyze gene-gene interactions. Composite International Diagnostic Interview (CIDI) 3.0 was used for MDD diagnosis. Results: The 1-year incidence of MDD among Han freshmen was 2.23% (95% CI : 1.91%-2.60%) and the gender difference of incidence between males (1.97%, 95% CI : 1.52%-2.56%) and females (2.39%, 95% CI : 1.98%-2.90%) was not statistically significant ( P >0.05). AG genotype of rs768705 (nearby gene: TMEM161B) was a risk factor for MDD ( OR =1.98, 95% CI : 1.24-2.83). The TC genotype of rs17727765 (nearby gene: CRYBA1) was only a risk factor for MDD in males ( OR =9.61, 95% CI : 2.04-45.30). An 8-loci interaction model (PMFBP1, OLFM4, LHPP, ENOX1, TMEM161B, SPPL3, FBXL4 and L3MBTL2) could predict MDD in women with an accuracy rate of 60.05%. No effective prediction model was found for MDD in men. Conclusions: There might be gender differences in the genetic etiology of MDD. Further researches on the genetic causes of MDD in men should be explored.

Published
2022
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