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150 results on '"Zhu, Limin"'

42. Well‐posedness and large‐time behavior for the two‐phase system with magnetic field in critical Besov spaces.

Author

Zhu, Limin

Abstract

This paper is dedicated to the study of the two‐phase system with magnetic field in multi‐dimensional spaces d≥2$d\ge 2$. We investigate the local and global well‐posedness of strong solutions to the Cauchy problem in critical Besov spaces. Moreover, a Lyapunov‐type energy argument can be developed, which leads to the time‐decay estimates of solutions without additional smallness assumptions. We improve the previous effects obtained by Wen and Zhu (JDE‐2018), Wang and Cheng (AMS‐2022), where they established the global well‐posedness of strong solutions in the H2(R3)$ H^{2}(\mathbb {R}^{3})$‐norm Sobolev spaces. [ABSTRACT FROM AUTHOR]

Published
2024
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44. Global existence and optimal time decay for the Baer-Nunziato model in the $ L^p $ critical Besov space.

Author

Zhu, Limin and Cao, Hongmei

Subjects
BESOV spaces, COMPRESSIBLE flow, TWO-phase flow, CAUCHY problem, STATE laws
Abstract

In this paper, we are devoted to the study of the compressible viscous Baer-Nunziato (BN) system in multi-dimensional spaces with $ d\geq2 $. Compared to previous findings, the (BN) system for compressible two-phase flows is led in two pressure state laws that vary with different phases. This property adds a practical physics background to this model. We will investigate the global existence of strong solutions to the Cauchy problem within the $ L^p $ critical regularity framework. Furthermore, we develop a Lyapunov-type energy argument that provides time-decay estimates of solutions without requiring additional smallness assumptions. [ABSTRACT FROM AUTHOR]

Published
2024
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45. Astragalus Injection Enhances the Sensitivity of Clinical Cancer Patients to Chemotherapy: A Systematic meta-Analysis.

Author

Ye, Tingjie, Yan, Xiaofeng, Xiu, Wenhao, Qin, Changtai, Yang, Yuxi, Yang, Jinzu, Zhu, Limin, Wang, Xiaoling, Xu, Wei, and Lu, Yanlin

Subjects
CANCER chemotherapy, CHINESE medicine, SCIENCE databases, QUALITY of life, DRUG resistance
Abstract

Background: Traditional Chinese Medicine Astragalus was commonly used to assist chemo-drug treatment in clinical cancer patients. However, whether Astragalus injection (AGI) reverses drug resistance remains unclear. Therefore, a meta-analysis is necessary to assess the effect of AGI on resistance reversement in cancer patients. Method: The studies presenting tumor response rates in cancer patients receiving chemo-drugs treatment in combination with AGI were systematically searched from six common scientific databases until February 2024. The relative risks (RRs) indicating the tumor response rate, 1-year survival rate, and quality of life improvement in clinical patients among two groups were calculated in metan package. The pooled RRs with 95% confidence intervals (CIs) were used to explore the effect of AGI on enhancing drug sensitivity in terms of tumor response, 1-year survival rate and quality of life improvement in cancer patients. Result: Fifty-one studies were included for meta-analysis following a thorough screening process that adhered to the inclusion and exclusion criteria. A total of 4613 patients were enrolled in all included trials. Results obtained indicated that AGI significantly enhanced the sensitivity of cancers to chemo-drugs with pooled RRs (95% CI) of 1.25 (1.18, 1.32), prolonged the 1-year survival rate of patients with pooled RRs (95% CI) of 1.34 (1.14, 1.57), improved the quality of life with pooled RRs (95% CI) of 1.61 (1.34, 1.93). Similarly, Astragalus's main component, astragaloside polysaccharides (APS), also enhances drug sensitivity in clinical cancer patients. Conclusion: Our findings demonstrated that AGI had the ability to resensitize cancers to chemo-drugs and improve the quality of life of cancer patients. Therefore, AGI could potentially be used as a drug resistance reversal for resistant cancer treatment. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Collision Avoidance Regulation-Compliant Orientation Guidance and Maneuvering Control Approach for Snake Robots

Author

Xiu, Yang, Deng, Hongbin, Li, Dongfang, Law, Rob, Wu, Edmond Q., and Zhu, Limin

Abstract

Snake robots under environments with avoidance constraints hardly track routes such that traditional guidance approaches become infeasible. Motivated by it, this work presents a line-of-sight-guidance virtual-snake-robot integrated scheme for snake robots to track paths and obey collision avoidance regulations. Main contributions include the avoidance regulation-compliant kinematics guidance law and finite-time-converged adaptive dynamic controller. In kinematics, a virtual leader is used to optimize nondifferentiable inflection into smooth to provide a jitter-free direction. Considering avoidance constraints, corresponding guidance strategies are innovatively designed for head-on, overtaking, and crossing scenarios to ensure the safety and autonomy of path tracking. In terms of dynamics, maneuvering control is executed by a finite-time disturbance observer-based event-triggered terminal sliding-mode controller. The unmeasured errors and uncertainties are accurately compensated, and input event-triggering rules can reduce the actuator burden. Finally, the stability analysis proves system errors’ finite-time convergence, and result validations confirm the performance superiority and feasibility of this method.

Published
2024
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