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1,184 results on '"Kong, Yuan"'

1. Extended dissipaton-equation-of-motion approach to study the electronic migration in adatom-graphene composite

Author

Su, Yu, Wang, Yao, Zhu, Zi-Fan, Kong, Yuan, Xu, Rui-Xue, Yan, YiJing, and Zheng, Xiao

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Chemical Physics
Abstract

Graphene has garnered significant attention due to its unique properties. Among its many intriguing characteristics, the tuning effects induced by adsorbed atoms (adatoms) provide immense potential for the design of graphene-based electronic devices. This work explores the electronic migration in the adatom-graphene composite, using the extended dissipaton-equation-of-motion (DEOM) approach. As an exact dynamics theory for open quantum systems embedded in environments composed of non-interacting electrons, the extended DEOM is capable of handling both linear and quadratic environmental couplings (a certain non-Gaussian effect) which account for the interactions between the adatom and the graphene substrate. We demonstrate and analyze the adatom-graphene correlated properties and the tuning effects by simulating the adatom spectral functions with varied Coulomb repulsion strengths. This work offers not only advanced theoretical methods but also new insights into the theoretical investigation of complex functional materials such as graphene-based electronic devices., Comment: 8 pages, 5 figures

Published
2024

9. Automated Quantification of Traffic Particulate Emissions via an Image Analysis Pipeline

Author

Ho, Kong Yuan, Lim, Chin Seng, Kattar, Matthena A., Boppana, Bharathi, Yu, Liya, and Ooi, Chin Chun

Subjects
Computer Science - Computers and Society, Computer Science - Computer Vision and Pattern Recognition, Physics - Fluid Dynamics
Abstract

Traffic emissions are known to contribute significantly to air pollution around the world, especially in heavily urbanized cities such as Singapore. It has been previously shown that the particulate pollution along major roadways exhibit strong correlation with increased traffic during peak hours, and that reductions in traffic emissions can lead to better health outcomes. However, in many instances, obtaining proper counts of vehicular traffic remains manual and extremely laborious. This then restricts one's ability to carry out longitudinal monitoring for extended periods, for example, when trying to understand the efficacy of intervention measures such as new traffic regulations (e.g. car-pooling) or for computational modelling. Hence, in this study, we propose and implement an integrated machine learning pipeline that utilizes traffic images to obtain vehicular counts that can be easily integrated with other measurements to facilitate various studies. We verify the utility and accuracy of this pipeline on an open-source dataset of traffic images obtained for a location in Singapore and compare the obtained vehicular counts with collocated particulate measurement data obtained over a 2-week period in 2022. The roadside particulate emission is observed to correlate well with obtained vehicular counts with a correlation coefficient of 0.93, indicating that this method can indeed serve as a quick and effective correlate of particulate emissions.

Published
2022

13. Clinical characteristics and risk stratification for late-onset herpes zoster following allogeneic hematopoietic stem cell transplantation

Author

Feng, Cheng-Jie, Zhao, Peng, Fu, Hai-Xia, Yan, Chen-Hua, Wang, Chen-Cong, Zhu, Xiao-Lu, He, Yun, Wang, Feng-Rong, Zhang, Yuan-Yuan, Mo, Xiao-Dong, Kong, Yuan, Han, Wei, Wang, Jing-Zhi, Wang, Yu, Chen, Huan, Chen, Yu-Hong, Zhao, Xiang-Yu, Chang, Ying-Jun, Xu, Lan-Ping, Liu, Kai-Yan, Huang, Xiao-Jun, and Zhang, Xiao-Hui

Published
2024
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35. Effect of SLM process parameters on microscopic defects and surface quality of GH3536 superalloy

Author

ZHANG Xuan, DONG Anping, DU Dafan, PAN Yunwei, XIONG Lianghua, KONG Yuan, and SUN Baode

Subjects
selective laser melting, gh3536 superalloy, process parameter, microscopic defects, surface quality, Motor vehicles. Aeronautics. Astronautics, TL1-4050
Abstract

GH3536 superalloy was fabricated using Selective Laser Melting (SLM) to investigate the effect of process parameters including the laser power and scanning speed on the density, microscopic defects and surface quality of GH3536 samples. According to the measurement of density, it can be found that the density of samples increases rapidly when the laser energy density is less than 57.0 J/mm3, the density of samples fluctuates within the range of 8.30 g/cm3-8.35 g/cm3 as the laser energy density increases from 57.0 J/mm3 to 187.0 J/mm3, while the density of samples decreases slightly when the laser energy further increases. The conclusion is that the inadequate or excessive energy input reduces the density of samples. The metallographic observation shows that there are a large number of lack-of-fusion defects when the laser energy is insufficient. However, when the input laser energy is too much, many evenly distributed microcracks and gas pores appear inside of samples, indicating that defects are the main reason for low density of samples. The optimal process parameters of SLM-processed GH3536 alloy are determined by the statistical analysis of spatter particles which might cause irregular defects. Tensile properties of the sample fabricated under 175 W and 700 mm/s are tested at room temperature and the results show that the SLM-ed GH3536 superalloy has good tensile properties at room temperature.

Published
2022
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42. Multiple Low‐Level Viraemia Suggest Hindered Liver Fibrosis Regression in Chronic Hepatitis B Patients During Antiviral Therapy.

Author

Lu, Zhengzhao, Sun, Ya‐Meng, Chen, Shuyan, Meng, Tongtong, Wang, Bingqiong, Zhou, Jialing, Wu, Xiaoning, Zhao, Xinyan, Ou, Xiaojuan, Kong, Yuan‐Yuan, Jia, Jidong, Zhao, Xinyu, and You, Hong

Subjects
CHRONIC hepatitis B, HEPATIC fibrosis, LIVER biopsy, LOGISTIC regression analysis, ODDS ratio
Abstract

Low‐level viraemia (LLV) occurs in chronic hepatitis B (CHB) patients despite antiviral treatment, which may cause failed histological regression. Our study aimed to investigate the impact of different LLV types on fibrosis regression. The prospective study enrolled CHB patients with paired liver biopsies before and after 260 weeks of entecavir treatment. Fibrosis regression was defined by the Ishak score or P‐I‐R system. Patients were grouped as the SVR (HBV DNA < 20 IU/mL persistently) or LLV (HBV DNA between 20 and 2000 IU/mL), which were further grouped as very low‐level viraemia (VLLV, HBV DNA < 50 IU/mL), occasionally LLV (OLLV, HBV DNA ≥ 50 IU/mL only once) and multiple LLV (MLLV, HBV DNA ≥ 50 IU/mL more than once). Logistic regression models were used to calculate the adjusted odds ratios (aORs) and 95% confidence intervals (CIs). The analysis included 111 CHB patients. In the SVR group (n = 54), 39 (72.2%) patients had fibrosis regression, which was higher than the LLV (56.1%, p = 0.080). The fibrosis regression rates for VLLV (30 patients), OLLV (17 patients) and MLLV (10 patients) were 70.0%, 52.9% and 30.0%, respectively. Compared with SVR, VLLV (aOR = 0.78; 95% CI: 0.28–2.21; p = 0.644) was not associated with fibrosis regression, but patients with non‐VLLV (aOR = 0.27; 95% CI: 0.09–0.85; p = 0.025), especially with MLLV (aOR = 0.19; 95% CI: 0.04–0.97; p = 0.046) is significantly associated with hindered fibrosis regression. Our study suggests that patients with detectable serum HBV DNA levels higher than 50 IU/mL need to be monitored carefully, especially in those with more than once. Trial Registration:ClinicalTrials.gov identifiers NCT01938781 and NCT01938820 [ABSTRACT FROM AUTHOR]

Published
2024
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