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226 results on '"Chen, Yu-Qing"'

4. Partial difference sets and amorphic Cayley schemes in non-abelian $2$-groups

Author

Feng, Tao, He, Zhiwen, and Chen, Yu Qing

Subjects
Mathematics - Combinatorics, 05E30, 05E18, 05C25
Abstract

In this paper, we consider regular automorphism groups of graphs in the RT$2$ family and the Davis-Xiang family and amorphic abelian Cayley schemes from these graphs. We derive general results on the existence of non-abelian regular automorphism groups from abelian regular automorphism groups and apply them to the RT$2$ family and Davis-Xiang family and their amorphic abelian Cayley schemes to produce amorphic non-abelian Cayley schemes., Comment: 16 pages, 0 figure

Published
2019

5. Affine flag graphs and classification of a family of symmetric graphs with complete quotients

Author

Chen, Yu Qing, Fang, Teng, and Zhou, Sanming

Subjects
Mathematics - Combinatorics, Mathematics - Group Theory, 05E18, 05C25, 20B20
Abstract

A graph $\Gamma$ is $G$-symmetric if $G$ is a group of automorphisms of $\Gamma$ which is transitive on the set of ordered pairs of adjacent vertices of $\Gamma$. If $V(\Gamma)$ admits a nontrivial $G$-invariant partition ${\cal B}$ such that for blocks $B, C \in {\cal B}$ adjacent in the quotient graph $\Gamma_{{\cal B}}$ of $\Gamma$ relative to ${\cal B}$, exactly one vertex of $B$ has no neighbour in $C$, then $\Gamma$ is called an almost multicover of $\Gamma_{{\cal B}}$. In this case an incidence structure with point set ${\cal B}$ arises naturally, and it is a $(G, 2)$-point-transitive and $G$-block-transitive 2-design if in addition $\Gamma_{{\cal B}}$ is a complete graph. In this paper we classify all $G$-symmetric graphs $\Gamma$ such that (i) ${\cal B}$ has block size $|B| \ge 3$; (ii) $\Gamma_{{\cal B}}$ is complete and almost multi-covered by $\Gamma$; (iii) the incidence structure involved is a linear space; and (iv) $G$ contains a regular normal subgroup which is elementary abelian. This classification together with earlier results in [A. Gardiner and C. E. Praeger, Australas. J. Combin. 71 (2018) 403--426], [M.~Giulietti et al., J. Algebraic Combin. 38 (2013) 745--765] and [T. Fang et al., Electronic J. Combin. 23 (2) (2016) P2.27] completes the classification of symmetric graphs satisfying (i) and (ii)., Comment: This is the final version

Published
2019
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12. Paley type group schemes from cyclotomic classes and Arasu-Dillon-Player difference sets

Author

Chen, Yu Qing and Feng, Tao

Subjects
Mathematics - Combinatorics
Abstract

In this paper, we present constructions of abelian Paley type group schemes by using multiplicative characters of finite fields and Arasu-Dillon-Player difference sets. The constructions produce many new Paley type group schemes that were previous unknown in our classification of Paley type group schemes in finite fields of small orders.

Published
2012

14. Expression of EGFR-mutant proteins and genomic evolution in EGFR-mutant transformed small cell lung cancer

Author

Zhang, Shi-Ling, primary, Zhang, Chan-Yuan, additional, Chen, Yu-Qing, additional, Li, Yu-Fa, additional, Xie, Zhi, additional, Zhang, Xu-Chao, additional, Zhou, Qing, additional, Zhong, Wen-Zhao, additional, Huang, Jie, additional, Sun, Hao, additional, Zheng, Ming-Ying, additional, Xiao, Fa-Man, additional, Yan, Hong-Hong, additional, Lu, Dan-Xia, additional, Lv, Zhi-Yi, additional, Wu, Yi-Long, additional, Chen, Hua-Jun, additional, and Yang, Jin-Ji, additional

Published
2023
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15. The center of some braid groups and the Farrell cohomology of certain pure mapping class groups

Author

Chen, Yu Qing, Glover, Henry H., and Jensen, Craig A.

Subjects
Mathematics - Algebraic Topology, Mathematics - Group Theory, 20F36, 20J06
Abstract

In this paper we first show that many braid groups of low genus surfaces have their centers as direct factors. We then give a description of centralizers and normalizers of prime order elements in pure mapping class groups of surfaces with spherical quotients using automorphism groups of fundamental groups of the quotient surfaces. As an application, we use these to show that the $p$-primary part of the Farrell cohomology groups of certain mapping class groups are elementary abelian groups. At the end we compute the $p$-primary part of the Farrell cohomology of a few pure mapping class groups., Comment: 16 pages

Published
2007
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16. On abelian $(2^{2m+1}(2^{m-1}+1), 2^m(2^m+1), 2^m)$-difference sets

Author

Arasu, K. T., Chen, Yu Qing, and Pott, Alexander

Subjects
Mathematics - Combinatorics, Mathematics - Number Theory, 05B10
Abstract

In this paper we prove that an abelian group contains $(2^{2m+1}(2^{m-1}+1), 2^m(2^m+1), 2^m)$-difference sets with $m\geqslant 3$ if and only if it contains an elementary abelian 2-group of order $2^{2m}$. Our proof shows that the method of constructing such difference sets is essentially unique., Comment: 18 pages

Published
2005

21. Autophagy in graves’ ophthalmopathy

Author

Chen, Yu-Qing, primary, Gao, Lian-Di, additional, Liu, Yi-Lin, additional, Shen, Ya, additional, Diao, Jia-Le, additional, Yang, Wei-Hua, additional, and Wei, Rui-Li, additional

Published
2023
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22. The polarization of microglia and infiltrated macrophages in the injured mice spinal cords: a dynamic analysis

Author

Li, Jing-Lu, primary, Fu, Gui-Qiang, additional, Wang, Yang-Yang, additional, Bian, Ming-Ming, additional, Xu, Yao-Mei, additional, Zhang, Lin, additional, Chen, Yu-Qing, additional, Zhang, Nan, additional, Ding, Shu-Qin, additional, Wang, Rui, additional, Fang, Rui, additional, Tang, Jie, additional, Hu, Jian-Guo, additional, and Lü, He-Zuo, additional

Published
2023
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28. Clinical outcomes of EGFR+/METamp+ vs. EGFR+/METamp‐ untreated patients with advanced non‐small cell lung cancer

Author

Peng, Kai‐Cheng, primary, Su, Jun‐Wei, additional, Xie, Zhi, additional, Wang, Han‐Min, additional, Fang, Mei‐Mei, additional, Li, Wen‐Feng, additional, Chen, Yu‐Qing, additional, Guan, Xu‐Hui, additional, Su, Jian, additional, Yan, Hong‐Hong, additional, Zhang, Xu‐Chao, additional, Tu, Hai‐Yan, additional, Zhou, Qing, additional, Chen, Hua‐Jun, additional, Wu, Yi‐Long, additional, and Yang, Jin‐Ji, additional

Published
2022
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37. Additional file 2 of Effect of hydroxychloroquine in patients with IgA nephropathy with insufficient responses to immunosuppressive therapy: a retrospective case-control study

Author

Tang, Chen, Lv, Ji-Cheng, Shi, Su-Fang, Chen, Yu-Qing, Liu, Li-Jun, and Zhang, Hong

Abstract

Additional file 2: Figure S1. Changes in urinary protein excretion and eGFR levels of all patients before initiation of HCQ therapy. The dots represent the median values, and the bars represent the 25th and 75th percentiles.

Published
2020
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49. Numerical method of electron-positron pairs generation in photon-photon collider

Author

Yan Xue-Qing, Chen Yu-Qing, Yu Jin-Qing, and Li Ang

Subjects
Breit–Wheeler process, Physics, Photon, Physics::Optics, General Physics and Astronomy, Electron, Collision, Threshold energy, Computational physics, law.invention, Momentum, Pair production, law, Collider
Abstract

The creation of positron and electron pairs through photon-photon collision, named Breit-Wheeler process, has been well understood in the theories of quantum electrodynamics for nearly 100 years. The photon-photon collision, which is one of the most basic processes of matter generation in the universe, has not been observed yet. The study on photon-photon collision can promote the development of two-photon physics, quantum electrodynamics theories and high energy physics. To observe photon-photon collision in the laboratory, one needs to collimate a huge number of energetic γ-ray photons into a very small spot. Recently, the development of highly collomated source generated by 10 PW laser makes photon-photon collider much more possible than before. In photon-photon collider, the study of numerical simulation plays a critical role since no experiment has achieved such a process. In this paper, a new numerical method is developed to handle the two-photon Breit-Wheeler process. This method is based on the exact two-photon collision dynamic principle, including energy threshold condition, cross-section condition, Lorentz transformation, etc. In the method, the photons are divided into quantitative photon blocks based on the spatial coordinates. Firstly, one needs to find the collision blocks according to the spatial motion law. Secondly, the ergodic method is used to look up the photons that satisfy the energy threshold condition and the cross-section condition from the blocks. Then, one can calculate the electron yield of the photon collision, and the kinetic parameters of the positrons and electrons. This method rigorously follows the physical principle so it has high precision. On the other hand, this method determines the collision of the block in advance, which can reduce the computational requirement a lot. A series of tests is carried out to confirm the accuracy and feasibility of this numerical method by calculating the collision between mono-energetic photon beams. In the tests, the collision angle is assumed to 180° and 60° separately, the results of pair momentum distribution are discussed. We also simulate the collision of the γ-ray beams generated through the interaction between ultra-intense laser and narrow tube targets. In the simulations, the collision angle is changed from 170° to 30° to see its effect on pair production. It is found that the yield of electron-positron pairs decreases with collision angle increasing, which has also been reported in previous work. Therefore, this numerical method can be efficiently used for modeling photon-photon collider, and provide theoretical reference and suggestion to the future experimental design of γ-ray collision.

Published
2020

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