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20,447 results on '"Li, Qun"'

267. The chiral restored quark stars can exist in the universe

Author

Su, Li-Qun, Yan, Yan, Li, Cheng-Ming, Huang, Yong-Feng, and Zong, Hongshi

Subjects
Nuclear Theory, Astrophysics - High Energy Astrophysical Phenomena
Abstract

In this paper, the equation of state (EOS) of deconfined quark stars is studied in the framework of the two-flavor NJL model, and the self-consistent mean field approximation is employed by introducing a parameter $\alpha$ combining the original Lagrangian and the Fierz-transformed Lagrangian, $\mathcal{L}_R= (1-\alpha)\mathcal{L}+\alpha\mathcal{L}_F$, to measure the weights of different interaction channels. It is believed that the deconfinement of phase transition happens along with the chiral phase transition. Thus, due to the lack of description of confinement in the NJL model, the vacuum pressure is set to confine quarks at low densities, which is the pressure corresponding to the critical point of chiral phase transition. We find that deconfined quark stars can reach over two-solar-mass, and the bag constant therefore shifts from $(130 ~\mathrm{MeV})^4$ to $(150 ~\mathrm{MeV})^4$ as $\alpha$ grows. In addition, the tidal deformability $\Lambda$ is yielded ranging from 253 to 482 along with the decrease of $~\alpha$, which satisfies the astronomical constraint of $\Lambda<800$ for 1.4-solar-mass neutron stars.

Published
2021

268. Hybrid stars can be self-bound

Author

Su, Li-Qun, Yan, Yan, Li, Cheng-Ming, Huang, Yong-Feng, and Zong, Hongshi

Subjects
Nuclear Theory, High Energy Physics - Phenomenology
Abstract

Based on the properties of uniform nuclear matter at the nuclear saturation density and basic thermodynamic relations, we first re-study the composition of matter on the surface of normal neutron stars and hybrid stars. It is found that the hybrid stars are composed of uniform hadronic matter on the surface rather than heavy nuclei. Then we use the Walceka model and the self-consistent NJL model to describe the equation of state of low-density hadrons and quark matter at high densities respectively, and the P--interpolation method is employed to connect the equation of state at the extreme densities to study hybrid stars. As a result, we find that the obtained hybrid star mass-radius relation and tidal deformability meet the latest astronomical data. More importantly, we find that the hybrid stars we obtained can be self-bound rather than gravitationally bound, which is completely different from previous related studies.

Published
2021
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269. Functional Electrical Stimulation of the Lateral Knee Muscles Can Reduce Peak Knee Adduction Moment during Stepping: A Pilot Study

Author

Raziyeh Baghi, Gad Alon, Giovanni Oppizzi, Subham Badhyal, Peter Bowman, and Li-Qun Zhang

Subjects
knee osteoarthritis, knee adduction moment, functional electrical stimulation, elliptical training, Technology, Biology (General), QH301-705.5
Abstract

Knee osteoarthritis (KOA) is an age-dependent disease dominantly affected by mechanical loading. Balancing the forces acting on the medial knee compartment has been the focus of KOA interventions. This pilot study investigated the effects of functional electrical stimulation (FES) of the biceps femoris and lateral gastrocnemius on reducing peak knee adduction moment (pKAM) in healthy adults and individuals with medial KOA while stepping on an instrumented elliptical system. Sixteen healthy individuals and five individuals with medial KOA stepped on the robotic stepping system, which measured footplate-reaction forces/torques and ankle kinematics and calculated 3-D knee moments in real time using inverse dynamics. Participants performed four different tasks: regular stepping without FES as the baseline condition, stepping with continuous FES of the lateral gastrocnemius (FESLG), biceps femoris (FESBF), and simultaneous FES of both lateral gastrocnemius and biceps femoris (FESLGBF), throughout the elliptical cycle. The 3-D knee moments, tibia kinematics, and footplate-reaction forces were compared between the baseline and the three FES stepping conditions. Healthy participants demonstrated lower pKAM during each of the three FES conditions compared to baseline (FESLG (p = 0.041), FESBF (p = 0.049), FESLGBF (p = 0.048)). Participants with KOA showed a trend of lower pKAM during FES, which was not statistically significant given the small sample available. Incorporating elliptical + FES as a training strategy is feasible and may help to enhance selective force generation of the targeted muscles and reduce the medial knee compartment loading.

Published
2024
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270. Dual Regulation Mechanism of Obesity: DNA Methylation and Intestinal Flora

Author

Yi Ren, Peng Huang, Lu Zhang, Yu-Fen Tang, Sen-Lin Luo, Zhou She, Hong Peng, Yu-Qiong Chen, Jin-Wen Luo, Wang-Xin Duan, Ling-Juan Liu, and Li-Qun Liu

Subjects
obesity, intestinal flora, DNA methylation, epigenetics, Biology (General), QH301-705.5
Abstract

Obesity is a multifactorial chronic inflammatory metabolic disorder, with pathogenesis influenced by genetic and non-genetic factors such as environment and diet. Intestinal microbes and their metabolites play significant roles in the occurrence and development of obesity by regulating energy metabolism, inducing chronic inflammation, and impacting intestinal hormone secretion. Epigenetics, which involves the regulation of host gene expression without changing the nucleotide sequence, provides an exact direction for us to understand how the environment, lifestyle factors, and other risk factors contribute to obesity. DNA methylation, as the most common epigenetic modification, is involved in the pathogenesis of various metabolic diseases. The epigenetic modification of the host is induced or regulated by the intestinal microbiota and their metabolites, linking the dynamic interaction between the microbiota and the host genome. In this review, we examined recent advancements in research, focusing on the involvement of intestinal microbiota and DNA methylation in the etiology and progression of obesity, as well as potential interactions between the two factors, providing novel perspectives and avenues for further elucidating the pathogenesis, prevention, and treatment of obesity.

Published
2024
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271. Adaptation and Validation of the Stanford Acute Stress Reaction Questionnaire to COVID-19 Related Events in China Mainland

Author

Zhu, Yan-bo, Ren, Jia-ju, Yu, Xiao-jing, Long, Li-qun, Zhang, Qian, Lv, Xiao-ying, Striełkowski, Wadim, Editor-in-Chief, Black, Jessica M., Series Editor, Butterfield, Stephen A., Series Editor, Chang, Chi-Cheng, Series Editor, Cheng, Jiuqing, Series Editor, Dumanig, Francisco Perlas, Series Editor, Al-Mabuk, Radhi, Series Editor, Scheper-Hughes, Nancy, Series Editor, Urban, Mathias, Series Editor, Webb, Stephen, Series Editor, Khan, Intakhab Alam, editor, Ramaswamy, Ganesan, editor, and Hussin, Zaharah Binti, editor

Published
2023
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299. Analysis of Chinese Medical Syndrome Features of Ischemic Stroke Based on Similarity of Symptoms Subgroup

Author

Liu, Xiao-qing, Zhang, Run-shun, Zhou, Xue-zhong, Zhou, Hong, He, Yu-yao, Han, Shu, Zhang, Jing, Shu, Zi-xin, Zhang, Xue-bin, Ji, Jing-hui, Zhong, Quan, Zhang, Li-li, Mou, Zi-jun, He, Li-yun, Zhang, Lun-zhong, Yang, Jie, Hu, Yan-jie, Chen, Zheng-guang, Li, Xiao-zhen, Tan, Yan, Yan, Zhan-feng, Cao, Ke-gang, Meng, Wei, Zhao, He, Zhang, Wei, and Zhong, Li-qun

Published
2023
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