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Your search keyword '"Guo, Xuejun"' showing total 694 results
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694 results on '"Guo, Xuejun"'

3. A new approach for constructing graph being determined by their generalized $Q$-spectrum

Author

Gao, Liwen and Guo, Xuejun

Subjects
Mathematics - Spectral Theory
Abstract

Given a graph $G$, we have the adjacency matrix $A(G)$ and degree diagonal matrix $D(G)$. The $Q$-spectrum is the all eigenvalues of $Q$-matrix $Q(G)=A(G)+D(G)$. A class of graphs is determined by their generalized $Q$-spectrum (DGQS for short) if any two graphs among the class have the same $Q$-spectrum and so do their complement imply that they are isomorphic. In [11], the authors provides a new way to construct $DGQS$ graphs by considering the rooted product graphs $G\circ P_{k}$ and they prove when $k=2,3$, $G\circ P_{k}$ is $DGQS$ for a special graph $G$. In this paper, we will prove that under the same conditions for $G$, the conclusion is true for any positive integer $k$.

Published
2023

4. CM points, class numbers, and the Mahler measures of $x^3+y^3+1-kxy$

Author

Tao, Zhengyu and Guo, Xuejun

Subjects
Mathematics - Number Theory
Abstract

We study the Mahler measures of the polynomial family $Q_k(x,y) = x^3+y^3+1-kxy$ using the method previously developed by the authors. An algorithm is implemented to search for CM points with class numbers $\leqslant 3$, we employ these points to derive interesting formulas that link the Mahler measures of $Q_k(x,y)$ to $L$-values of modular forms. As by-products, some conjectural identities of Samart are confirmed, one of them involves the modified Mahler measure $\tilde{n}(k)$ introduced by Samart recently. For $k=\sqrt[3]{729\pm405\sqrt{3}}$, we also prove an equality that expresses a $2\times 2$ determinant with entries the Mahler measures of $Q_k(x,y)$ as some multiple of the $L$-value of two isogenous elliptic curves over $\mathbb{Q}(\sqrt{3})$., Comment: 19 pages, 2 tables and 2 figures

Published
2023

5. Opportunities and challenges of CD47-targeted therapy in cancer immunotherapy

Author

CHEN, QIUQIANG, GUO, XUEJUN, and MA, WENXUE

Subjects
Biomedical and Clinical Sciences, Oncology and Carcinogenesis, Immunology, Cancer, Hematology, Immunization, Vaccine Related, Development of treatments and therapeutic interventions, 5.1 Pharmaceuticals, Good Health and Well Being, Humans, CD47 Antigen, Immunotherapy, Membrane Proteins, Tumor Microenvironment, Neoplasms, CD47, Cancer immunotherapy, CD47-targeted therapies, Tumor microenvironment, Macrophage, Cancer cell, Immune evasion, Checkpoint inhibitors, CAR T-cell therapy, Cancer treatment outcomes, Medicinal & Biomolecular Chemistry, Oncology & Carcinogenesis, Oncology and carcinogenesis
Abstract

Cancer immunotherapy has emerged as a promising strategy for the treatment of cancer, with the tumor microenvironment (TME) playing a pivotal role in modulating the immune response. CD47, a cell surface protein, has been identified as a crucial regulator of the TME and a potential therapeutic target for cancer therapy. However, the precise functions and implications of CD47 in the TME during immunotherapy for cancer patients remain incompletely understood. This comprehensive review aims to provide an overview of CD47's multifaced role in TME regulation and immune evasion, elucidating its impact on various types of immunotherapy outcomes, including checkpoint inhibitors and CAR T-cell therapy. Notably, CD47-targeted therapies offer a promising avenue for improving cancer treatment outcomes, especially when combined with other immunotherapeutic approaches. The review also discusses current and potential CD47-targeted therapies being explored for cancer treatment and delves into the associated challenges and opportunities inherent in targeting CD47. Despite the demonstrated effectiveness of CD47-targeted therapies, there are potential problems, including unintended effects on healthy cells, hematological toxicities, and the development if resistance. Consequently, further research efforts are warranted to fully understand the underlying mechanisms of resistance and to optimize CD47-targeted therapies through innovative combination approaches, ultimately improving cancer treatment outcomes. Overall, this comprehensive review highlights the significance of CD47 as a promising target for cancer immunotherapy and provides valuable insight into the challenges and opportunities in developing effective CD47-targeted therapies for cancer treatment.

Published
2024

6. Lower bound estimates for the rank of universal quadratic forms in some families of real cubic fields with density one

Author

Gao, Liwen and Guo, Xuejun

Subjects
Mathematics - Number Theory
Abstract

In this paper, we establish the explicit lower bound estimates for the rank of universal quadratic forms in some certain families of real cubic fields under the condition of density one. The more general results that represent all multiples of a given rational integer are obtained for totally positive definite quadratic lattices. Our main tools are some properties of indecomposable integers with trace in these fields and short vectors in quadratic lattices.

Published
2023

7. Distribution of the k-regular partition function modulo composite integers M

Author

Lu, Yiwen and Guo, Xuejun

Subjects
Mathematics - Number Theory
Abstract

Let $b_k(n)$ denote the $k-$regular partitons of a natural number $n$. In this paper, we study the behavior of $b_k(n)$ modulo composite integers $M$ which are coprime to $6$. Specially, we prove that for arbitrary $k-$regular partiton function $b_k(n)$ and integer $M$ coprime to $6$, there are infinitely many Ramanujan-type congruences of $b_k(n)$ modulo $M$.

Published
2022

8. Reform of the Teaching Mode of Military Physical Education Courses under the Hierarchical Progressive Training Model

Author

Guo, Xuejun, 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, Chitrakar, Roshan, editor, Liliana, Mata, editor, Dobrota, Dan, editor, Peng, Chew Fong, editor, and Tessema, Ameha Tefera, editor

Published
2024
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9. An improvement on the parity of Schur's partition function

Author

Lu, Yiwen, Wei, Tao, and Guo, Xuejun

Subjects
Mathematics - Number Theory
Abstract

We improve S.-C. Chen's result on the parity of Schur's partition function. Let $A(n)$ be the number of Schur's partitions of $n$, i.e., the number of partitions of $n$ into distinct parts congruent to $1, 2 \mod{3}$. S.-C. Chen \cite{MR3959837} shows $\small \frac{x}{(\log{x})^{\frac{47}{48}}} \ll \sharp \{0\le n\le x:A(2n+1)\; \text{is odd}\}\ll \frac{x}{(\log{x})^{\frac{1}{2}}}$. In this paper, we improve Chen's result to $\frac{x}{(\log{x})^{\frac{11}{12}}} \ll \sharp \{0\le n\le x:A(2n+1)\; \text{is odd}\}\ll \frac{x}{(\log{x})^{\frac{1}{2}}}.$

Published
2022

10. The rank of 2-Selmer group associate to $\theta$-congruent numbers

Author

Wei, Tao and Guo, Xuejun

Subjects
Mathematics - Number Theory
Abstract

We study the parity of rank of $2$-${\rm Selmer}$ groups associated to $\pi/3$ and $2\pi/3$-congruent numbers. Our second result gives some positive densities about $\pi/3$ and $2\pi/3$ non-congruent numbers which can support the even part of Goldfeld's conjecture. We give some necessary conditions such that $n$ is non $\pi/3$-congruent number for elliptic curves $E_n$ whose Shafarevich-Tate group is non-trivial. In the last section, we show that for $n=pq\equiv 5(resp. \ 11)\pmod{24}$, the density of non $\pi/3$($resp.$ $2\pi/3$)-congruent numbers is at least 75\%, where $p,q$ are primes.

Published
2022

11. Mahler measures and $L$-values of elliptic curves over real quadratic fields

Author

Tao, Zhengyu, Guo, Xuejun, and Wei, Tao

Subjects
Mathematics - Number Theory
Abstract

A famous formula of Rodriguez Villegas shows that the Mahler measures $m(k)$ of $P_k(x,y)=x+1/x+y+1/y+k$ can be written as a Kronecker-Eisenstein series. We prove that the degree of $k$ in Villegas' formula can be bounded by the class numbers of CM points. This fact allows us to systematically derive $28$ new identities linking $m(k)$ to $L$-values of cusp forms. Guided by Beilinson's conjecture, we also prove $5$ formulas that express $L$-values of CM elliptic curves over real quadratic fields to some $2\times 2$ determinants of $m(k)$. This extends a recent work of Guo (the second author of this paper), Ji, Liu, and Qin, in which they dealt with the cases when $k=4\pm 4\sqrt{2}$.

Published
2022

12. Some new Ramanujan-Sato series for $1/\pi$

Author

Wei, Tao, Tao, Zhengyu, and Guo, Xuejun

Subjects
Mathematics - Number Theory
Abstract

We derive 10 new Ramanujan-Sato series of $1/\pi$ by using the method of Huber, Schultz and Ye. The levels of these series are 14, 15, 16, 20, 21, 22, 26, 35, 39.

Published
2022

14. An intra-covid-19 assessment of hand hygiene facility, policy and staff compliance in two hospitals in Sierra Leone: Is there a difference between regional and capital city hospitals?

Author

Lakoh, Sulaiman, Firima, Emmanuel, Williams, Christine Ellen Elleanor, Conteh, Sarah K, Jalloh, Mohamed Boie, Sheku, Mohamed Gbeshay, Adekanmbi, Olukemi, Sevalie, Stephen, Kamara, Sylvia Adama, Kamara, Mohamed Akmed Salim, Barrie, Umu, Kamara, Gladys Nanilla, Yi, Le, Guo, Xuejun, Haffner, Chukwuemeka, Kamara, Matilda N, Jiba, Darlinda F, Namanaga, Enanga Sonia, Maruta, Anna, Kallon, Christiana, Kanu, Joseph Sam, Deen, Gibrilla F, Samai, Mohamed, Okeibunor, Joseph Chukwudi, and Russell, James BW

Published
2021

16. High incidence of catheter-associated urinary tract infections and related antibiotic resistance in two hospitals of different geographic regions of Sierra Leone: a prospective cohort study

Author

Lakoh, Sulaiman, Yi, Le, Russell, James B.W., Zhang, Juling, Sevalie, Stephen, Zhao, Yongkun, Kanu, Joseph Sam, Liu, Peng, Conteh, Sarah K., Williams, Christine Ellen Elleanor, Barrie, Umu, Adekanmbi, Olukemi, Jiba, Darlinda F., Kamara, Matilda N., Sesay, Daniel, Deen, Gibrilla F., Okeibunor, Joseph Chukwudi, Yendewa, George A., Guo, Xuejun, and Firima, Emmanuel

Published
2023
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31. Incidence and risk factors of surgical site infections and related antibiotic resistance in Freetown, Sierra Leone: a prospective cohort study

Author

Lakoh, Sulaiman, Yi, Le, Sevalie, Stephen, Guo, Xuejun, Adekanmbi, Olukemi, Smalle, Isaac O., Williams, Nathaniel, Barrie, Umu, Koroma, Celesis, Zhao, Yongkun, Kamara, Matilda N., Cummings-John, Constance, Jiba, Darlinda F., Namanaga, Enanga Sonia, Deen, Betsy, Zhang, Juling, Maruta, Anna, Kallon, Christiana, Liu, Peng, Wurie, Haja Ramatulai, Kanu, Joseph Sam, Deen, Gibrilla F., Samai, Mohamed, Sahr, Foday, and Firima, Emmanuel

Published
2022
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35. Big Data Promotes the Tibetan Plateau and Pan-Third Pole Earth System Science

Author

Li, Xin, Pan, Xiaoduo, Guo, Xuejun, Qin, Jun, An, Baosheng, Wang, Tao, Ye, Qinghua, Wang, Weimin, Yang, Xiaojuan, Niu, Xiaolei, Feng, Min, Che, Tao, Jin, Rui, Guo, Jianwen, Chinese Academy of Sciences, Cyberspace Administration of China, Ministry of Education of the PRC, Ministry of Science and Technology of the PRC, China Association for Science and Technology, Chinese Academy of Social Sciences, National Natural Science Foundation of China, and Chinese Academy of Agricultural Sciences

Published
2021
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39. Comparative genomics of Tn6411 transposons carrying the blaIMP-1 gene in Pseudomonas aeruginosa.

Author

Zheng, Lin, Wang, Zixian, Guo, Jingyi, Guan, Jiayao, Lu, Gejin, Jing, Jie, Sun, Shiwen, Sun, Yang, Ji, Xue, Jiang, Bowen, Wang, Yongjie, Zhao, Chuanfang, Zhu, Lingwei, and Guo, Xuejun

Subjects
COMPARATIVE genomics, PSEUDOMONAS aeruginosa, TRANSPOSONS, CARBAPENEM-resistant bacteria, WHOLE genome sequencing, MOBILE genetic elements, BACTERIAL genomes
Abstract

We aimed to determine the molecular characteristics of carbapenem-resistant Pseudomonas aeruginosa strains 18081308 and 18083286, which were isolated from the urine and the sputum of two Chinese patients, respectively. Additionally, we conducted a comparative analysis between Tn6411 carrying blaIMP-1 in strain 18083286 and transposons from the same family available in GenBank. Bacterial genome sequencing was carried out on strains 18081308 and 18083286 to obtain their whole genome sequence. Average nucleotide identity (ANI) was used for their precise species identification. Serotyping and multilocus sequence typing were performed. Furthermore, the acquired drug resistance genes of these strains were identified. The carbapenem-resistant P. aeruginosa strains isolated in the present study were of sequence type ST865 and serotype O6. They all carried the same resistance genes (aacC2, tmrB, and blaIMP-1). Tn6411, a Tn7-like transposon carrying blaIMP-1, was found in strain 18083286 by single molecule real time (SMRT) sequencing. We also identified the presence of this transposon sequence in other chromosomes of P. aeruginosa and plasmids carried by Acinetobacter spp. in GenBank, indicating the necessity for heightening attention to the potential transferability of this transposon. [ABSTRACT FROM AUTHOR]

Published
2024
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