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8. Probing the transport properties of Quark-Gluon Plasma via heavy-flavor Boltzmann and Langevin dynamics

Author

Li, Shuang, Wang, Chaowen, Wan, Renzhuo, and Liao, Jinfeng

Subjects
High Energy Physics - Phenomenology
Abstract

The heavy quark propagation behavior inside the quark-gluon plasma (QGP), is usually described in terms of the Boltzmann dynamics, which can be reduced to the Langevin approach by assuming a small momentum transfer for the scattering processes between heavy quarks and the QGP constituents. In this work, the temperature and energy dependence of the transport coefficients are calculated in the framework of both Boltzmann and Langevin dynamics. The derived transport coefficients are found to be systematically larger in the Boltzmann approach as compared with the Langevin, in particular in the high temperature and high energy region. Within each of the two theoretical frameworks, we simulate the charm quark production and the subsequent evolution processes in relativistic heavy-ion collisions. We find that the total in-medium energy loss is larger from the Langevin dynamics, resulting in a smaller (larger) $R_{\rm AA}$ at high (low) $p_{\rm T}$, for both the charm quark and heavy-flavor mesons. Meanwhile, the Boltzmann model is found to induce larger $v_{\rm 2}$, in particular at moderate $p_{\rm T}$, as well as stronger broadening behavior for the azimuthal distributions. By comparing the model calculations with available experimental measurements for D-mesons, we find that the Langevin approach is more favored by the $R_{\rm AA}$ data while the Boltzmann approach is more favored favor by the $v_{\rm 2}$ data. A simultaneous description of both observables appear challenging for both models., Comment: 14 pages, 12 figures; Accepted by Phys.Rev.C

Published
2019
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10. Charm-strange meson production in ultra-relativistic heavy-ion collisions at the CERN-LHC energies

Author

Li, Shuang and Wang, Chaowen

Subjects
High Energy Physics - Phenomenology
Abstract

The nuclear modification factor ${R}_{\rm AA}$ and the elliptic flow coefficient ${v}_{\rm 2}$ of charm-strange meson $D^{+}_{s}$ is systematically studied in Pb--Pb collisions at $\sqrt{s_{\rm NN}}=5.02~{\rm TeV}$ and $2.76~{\rm TeV}$. During the modeling, the coupling strength between the injected charm quark and the incident medium constituents, is extracted from the lattice QCD calculations: $2\pi TD_{s}=7$ (\textbf{Model-A}) and $2\pi TD_{s}=1.3 + (T/T_{c})^2$ (\textbf{Model-B}). We find that, comparing ${R}_{\rm AA}(D^{+}_{s})$ with ${R}_{\rm AA}(non-strange)$, the heavy-light coalescence effect is more pronounced for the former one, resulting in an enhancement behavior in the range $2\lesssim {p}_{\rm T}\lesssim5~{\rm GeV}$. The predictions of ${R}_{\rm AA}(D^{+}_{s})$ and ${R}_{\rm AA}(non-strange)$ favor Model-A to have a better description of the measured ${p}_{\rm T}$ dependence in both energies, while their ${v}_{\rm 2}$ prefer Model-B at moderate ${p}_{\rm T}$ ($2\lesssim {p}_{\rm T}\lesssim4~{\rm GeV}$). Therefore, it is necessary to consider the temperature- and/or momentum-dependence of $2\pi TD_{s}$ to describe simultaneously ${R}_{\rm AA}(D^{+}_{s})$ and ${v}_{\rm 2}(D^{+}_{s})$ in different centrality classes in Pb--Pb collisions., Comment: 8 pages, 8 figures; Accepted by Phys. Rev. C

Published
2018
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11. Production of open-charm mesons in relativistic heavy-ion collisions

Author

Li, Shuang, Wang, Chaowen, Yuan, Xianbao, and Feng, Shengqin

Subjects
High Energy Physics - Phenomenology, Nuclear Theory
Abstract

We present a theoretical framework to study open charm production in relativistic heavy-ion collisions. The coupling strength between the charm quarks and the QGP constituents, quantified by the spatial diffusion coefficient $2\pi TD_{s}$, is obtained by performing a phenomenological fit analysis to the lattice QCD calculations, resulting in $2\pi TD_{s}=const.$ (\textbf{Model-A}) and $2\pi TD_{s}=1.3 + (T/T_{c})^2$ (\textbf{Model-B}). We find that the relative azimuthal distribution of the initially back-to-back generated $c\bar{c}$ pairs presents a broadening behaviour, which is more pronounced for $c\bar{c}$ pairs with small initial $p_{\rm T}$, and when the Model-B approach is adopted. The competition between the initial drag and the subsequent collective effects tends to restrict the time dependence of charm quark $R_{\rm AA}$. Concerning the theoretical uncertainty on final D-meson nuclear modification, the nuclear shadowing and pp baseline components are dominat at high and low $p_{\rm T}$ ($p_{\rm T}\lesssim3~{\rm GeV/{\it c}}$), respectively. The measured D-meson $R_{\rm AA}(p_{\rm T})$ favors Model-A assumption for the diffusion coefficient both at RHIC and LHC, while their $v_{2}(p_{\rm T})$ prefer Model-B at moderate $p_{\rm T}$. These results confirm the necessity to consider the temperature- and/or momentum-dependence of $2\pi TD_{s}$ to describe well the D-meson $R_{\rm AA}$ and $v_{\rm 2}$ simultaneously., Comment: 17 pages, 18 figures; Accepted by Phys. Rev. C

Published
2018
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15. Strength and Modal Analysis of High Speed EMU Gearbox Housing

Author

Huang, Haijun, Yin, Bichao, Wang, Chaowen, Zhu, Haiyan, Ceccarelli, Marco, Series Editor, Hernandez, Alfonso, Editorial Board Member, Huang, Tian, Editorial Board Member, Takeda, Yukio, Editorial Board Member, Corves, Burkhard, Editorial Board Member, Agrawal, Sunil, Editorial Board Member, and Tan, Jianrong, editor

Published
2020
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22. Development, Validation and Clinical Utility of a Risk Prediction Model for Maternal and Neonatal Adverse Outcomes in Pregnant Women with Hypothyroidism

Author

Shao,Cuixiang, Chen,Qi, Tang,Siwen, Wang,Chaowen, Sun,Renjuan, Shao,Cuixiang, Chen,Qi, Tang,Siwen, Wang,Chaowen, and Sun,Renjuan

Abstract

Cuixiang Shao,1,2 Qi Chen,3 Siwen Tang,4 Chaowen Wang,1 Renjuan Sun5 1Department of Obstetrics, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu, 214000, People’s Republic of China; 2Wuxi Medical College, Jiangnan University, Wuxi, Jiangsu, 214122, People’s Republic of China; 3Department of Gastroenterology, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu, 214000, People’s Republic of China; 4Department of Intensive Care Unit, First People ‘s Hospital of Pinghu, Pinghu, Zhejiang, 314299, People’s Republic of China; 5Department of Nutrition, Affiliated Hospital of Jiangnan University, Wuxi, Jiangsu, 214000, People’s Republic of ChinaCorrespondence: Renjuan Sun, Department of Nutrition, Affiliated Hospital of Jiangnan University, 1000 Hefeng Road, Wuxi, Jiangsu, 214000, People’s Republic of China, Tel +86 13813479833, Email sunrj2023rj@163.comPurpose: This study aimed to create, verify and assess the clinical utility of a prediction model for maternal and neonatal adverse outcomes in pregnant women with hypothyroidism.Methods: A prediction model was developed, and its accuracy was tested using data from a retrospective cohort. The study focused exclusively on female patients diagnosed with hypothyroidism who were admitted to a tertiary hospital. The development and validation cohort comprised individuals who gave birth between 1 October 2020 and 31 December 2022. The primary outcome was a combination of crucial maternal and newborn problems (eg premature births, abortions and neonatal asphyxia). The prediction model was developed using logistic regression. Evaluation of the model’s performance was conducted based on its ability to discriminate, calibrate and provide clinical value.Results: In total, nine variables were chosen to develop the predictive model for adverse maternal and neonatal outcomes during pregnancy with hypothyroidism. The area under the curve of the model for predicting maternal adverse outcomes was 0.845, and that

Published
2024

43. Current and future trends in the biocontrol of postharvest diseases.

Author

Li, Xiaojiao, Zeng, Shixian, Wisniewski, Michael, Droby, Samir, Yu, Longfeng, An, Fuquan, Leng, Yan, Wang, Chaowen, Li, Xiaojun, He, Min, Liao, Qinhong, Liu, Jia, Wang, Yong, and Sui, Yuan

Subjects
POSTHARVEST diseases, DOUBLE-stranded RNA, BIOLOGICAL pest control agents, BIOLOGY
Abstract

Postharvest diseases of fruits and vegetables cause significant economic losses to producers and marketing firms. Many of these diseases are caused by necrotrophic fungal pathogens that require wounded or injured tissues to establish an infection. Biocontrol of postharvest diseases is an evolving science that has moved from the traditional paradigm of one organism controlling another organism to viewing biocontrol as a system involving the biocontrol agent, the pathogen, the host, the physical environment, and most recently the resident microflora. Thus, the paradigm has shifted from one of simplicity to complexity. The present review provides an overview of how the field of postharvest biocontrol has evolved over the past 40 years, a brief review of the biology of necrotrophic pathogens, the discovery of BCAs, their commercialization, and mechanisms of action. Most importantly, current research on the use of marker-assisted-selection, the fruit microbiome and its relationship to the pathobiome, and the use of double-stranded RNA as a biocontrol strategy is discussed. These latter subjects represent evolving trends in postharvest biocontrol research and suggestions for future research are presented. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Elevated physical weathering exceeds chemical weathering of clays during the Paleocene-Eocene Thermal Maximum in the continental Bighorn Basin (Wyoming, USA)

Author

Stratigraphy and paleontology, Stratigraphy & paleontology, Ji, Kaipeng, Wang, Chaowen, Hong, Hanlie, Yin, Ke, Zhao, Chenlei, Xu, Yanxiao, Song, Bowen, Prins, Maarten, Lourens, Lucas J., Gingerich, Philip D., Abels, Hemmo A., Stratigraphy and paleontology, Stratigraphy & paleontology, Ji, Kaipeng, Wang, Chaowen, Hong, Hanlie, Yin, Ke, Zhao, Chenlei, Xu, Yanxiao, Song, Bowen, Prins, Maarten, Lourens, Lucas J., Gingerich, Philip D., and Abels, Hemmo A.

Published
2023

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