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113 results on '"Luo, Qiuyan"'

1. The impact of bias row noise to photometric accuracy: case study based on a scientific CMOS detector

Author

Shao, Li, Zhan, Hu, Liu, Chao, Chi, Haonan, Luo, Qiuyan, Mu, Huaipu, and Shi, Wenzhong

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We tested a new model of CMOS detector manufactured by the Gpixel Inc, for potential space astronomical application. In laboratory, we obtain some bias images under the typical application environment. In these bias images, clear random row noise pattern is observed. The row noise also contains some characteristic spatial frequencies. We quantitatively estimated the impact of this feature to photometric measurements, by making simulated images. We compared different bias noise types under strict parameter control. The result shows the row noise will significantly deteriorate the photometric accuracy. It effectively increases the readout noise by a factor of 2 to 10. However, if it is properly removed, the image quality and photometric accuracy will be significantly improved., Comment: 23 pages, 18 figures

Published
2023
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15. mNGS facilitates the accurate diagnosis and antibiotic treatment of suspicious critical CNS infection in real practice: A retrospective study

Author

Feng Li, Chen Jiaxin, Luo Qiuyan, Su Miao, Chen Peisong, Lai Rong, Shen Cunzhou, Zhou Hongyan, Wang Haiyan, Sun Xunsha, Chen Ling, Xia Han, and Feng Huiyu

Subjects
mngs, severe cns infection, pathogen identification, empirical antibiotic treatment, accurate adjustment, Biology (General), QH301-705.5
Abstract

Whether metagenomic next-generation sequencing (mNGS) could benefit patients with suspected severe central nervous system (CNS) infection in terms of diagnosis and antibiotic treatment remains unknown. We retrospectively analyzed 79 patients with suspected CNS infection and undertook mNGS. The value of mNGS was investigated in terms of identification of pathogen and guidance for the adjustment of antibiotic treatment. The relationship between the time of initiating mNGS since onset and the Glasgow Outcome Scale (GOS) score after 90-day follow-up were analyzed. Fifty out of 79 cases with suspicious severe CNS infection were finally diagnosed. Despite previous routine laboratory tests, mNGS further promoted the accurate identification of pathogens in 23 cases (47.9%). The sensitivity, specificity, and accuracy of mNGS test in this study were 84.0, 79.3, and 82.3%, respectively. Furthermore, mNGS facilitated the adjustment of empirical antibiotic treatments in 38 cases (48.1%). The time of taking mNGS since onset had an insignificant weak positive correlation with GOS after 90-day follow-up (r = −0.73, P = 0.08). mNGS facilitated the accurate identification of pathogens in suspicious severe CNS infections and promoted the accurate antibiotic therapy even empirical antibiotics were administrated. It should be taken as early as possible to improve the clinical outcome of patients with suspicious severe CNS infection.

Published
2023
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21. Preparation, characterization, and photoluminescent and semiconductive properties of an iron compound.

Author

Luo, Qiuyan, Chen, Yang-Qing, Peng, Hai-Qi, Ji, Qiong, Wang, Xuan-Xuan, Wei, Lijun, Zhong, Qiu-Yue, and Chen, Wen-Tong

Subjects
*TIME-dependent density functional theory, *BAND gaps, *CHARGE transfer, *X-ray diffraction, *PHOTOLUMINESCENCE
Abstract

One iron compound {[Fe(bipy)3]2(SO3)(OH)4}·14H2O (1) (bipy = 2,2'-bipyridine) has been obtained from a hydrothermal reaction and structurally characterized by single-crystal X-ray diffraction. Compound 1 is characterized by an isolated (0D) structure and the iron center is coordinated by six nitrogen atoms of three bipy molecules to yield an octahedron. Photoluminescence investigation shows that compound 1 displays an emission in the green region. Time-dependent density functional theory (TDDFT) calculation reveals that the photoluminescent emission can be assigned to the ligand-to-metal charge transfer (LMCT) (from the HOMO of the bipy to the LUMO of the iron). Solid-state diffuse reflectance spectra discover that compound 1 features a narrow optical band gap of 1.82 eV, indicating that it is a potential narrow band gap semiconductor. One iron compound has been obtained from a hydrothermal reaction and characterized by single-crystal X-ray diffraction. It features an isolated structure. It displays a photoluminescence emission in the green region which can be assigned to LMCT. It features a narrow optical band gap of 1.82 eV, indicating that it is a potential narrow band gap semiconductor. [ABSTRACT FROM AUTHOR]

Published
2024
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22. 应用于激光聚变的X射线分幅成像技术

Author

Cai, Houzhi, primary, Deng, Xuan, additional, Luo, Qiuyan, additional, Du, Zhuoming, additional, Huang, Xiaoya, additional, Niu, Lihong, additional, Zhang, Jingjin, additional, Liu, Jinyuan, additional, and Xiang, Lijuan, additional

Published
2023
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25. Novel insights into causal effects of maternal nonalcoholic fatty liver disease on adverse pregnancy outcomes: evidence from Human Genetics and Mendelian Randomization Study

Author

Luo, Qiuyan, Liu, Guoting, Li, Qiulan, Lu, Jinghong, Zheng, Wenjing, Huang, Yukui, and Li, Cun

Abstract

Background: Observational studies have associated nonalcoholic fatty liver disease (NAFLD) with adverse pregnancy events, but findings show heterogeneity, leaving the causal direction and mediating pathways unclear. We aimed to investigate the causal relation between NAFLD and various pregnancy events, and to elucidate the underlying mediating pathways while determining the proportion of this correlation that is mediated through these pathways. Methods: A genome-wide association study involving over 6 million participants employing Mendelian randomization (MR) and mediation analysis was performed. The study used genetically predicted NAFLD as exposures and cardiometabolic traits as mediators, with various adverse pregnancy events as outcomes. The main analysis was performed using the inverse variance weighted (IVW) approach, while sensitivity analyses included the weighted median, weighted mode, MR-Egger, and MR-PRESSO methods. Mediation analyses were performed using a two-step MR framework. Results: In this MR cohort study, NAFLD was found to be strongly associated with elevated risks of GDM (P= 0.019 for the discovery dataset, P< 0.001 for the discovery dataset) and HDPs, including any HDP (P< 0.001 for the both datasets), gestational hypertension (P= 0.007 for the discovery dataset, P< 0.001 for the discovery dataset), and pre-eclampsia or eclampsia (P= 0.040 for the discovery dataset, P< 0.001 for the discovery dataset). However, no significant associations were found with hemorrhage in early pregnancy, postpartum hemorrhage, preterm birth, or offspring birthweight for both datasets. Cardiometabolic traits played a significant mediating role in these associations, rather than solely acting as confounding factors. Conclusions: This study provided evidence supporting a correlation between NAFLD and a higher risk of adverse pregnancy events and introduces some new insights. These findings may inform preventions and interventions for remediating adverse pregnancy outcomes attributable to NAFLD.

Published
2024
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34. 微通道板增益均匀性理论研究

Author

Deng Pokun, 邓珀昆, primary, Lin Kaixuan, 林楷宣, additional, Luo Qiuyan, 罗秋燕, additional, Long Jinghua, 龙井华, additional, Wang Dong, 王东, additional, Lei Yunfei, 雷云飞, additional, Huang Junkun, 黄峻堃, additional, Wang Yong, 王勇, additional, Cai Houzhi, 蔡厚智, additional, Liu Jinyuan, 刘进元, additional, and Niu Lihong, 牛丽红, additional

Published
2022
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35. 脉冲展宽X射线分幅相机空间分辨特性研究

Author

Luo Qiuyan, 罗秋燕, primary, Lin Kaixuan, 林楷宣, additional, Chen Jiajie, 陈嘉杰, additional, Wang Jiaheng, 王佳恒, additional, Huang Junkun, 黄峻堃, additional, Fu Wenyong, 付文勇, additional, Cai Houzhi, 蔡厚智, additional, and Liu Jinyuan, 刘进元, additional

Published
2022
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39. 脉冲展宽X射线分幅相机空间分辨特性研究

Author

罗秋燕 Luo Qiuyan, 林楷宣 Lin Kaixuan, 陈嘉杰 Chen Jiajie, 王佳恒 Wang Jiaheng, 黄峻堃 Huang Junkun, 付文勇 Fu Wenyong, 蔡厚智 Cai Houzhi, and 刘进元 Liu Jinyuan

Subjects
Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics
Published
2022

40. 微通道板增益均匀性理论研究

Author

邓珀昆 Deng Pokun, 林楷宣 Lin Kaixuan, 罗秋燕 Luo Qiuyan, 龙井华 Long Jinghua, 王东 Wang Dong, 雷云飞 Lei Yunfei, 黄峻堃 Huang Junkun, 王勇 Wang Yong, 蔡厚智 Cai Houzhi, 刘进元 Liu Jinyuan, and 牛丽红 Niu Lihong

Subjects
Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics
Published
2022

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