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Investigation on cavitating turbulent flow for the twisted NACA66 hydrofoil using a PANS model with helicity modification

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Journal of Hydrodynamics 2024年第2期36卷 219-231页

作者： Chen geng Zhao-hui Qian Ke-xin Zheng Wei-xiang Ye xian-wu Luo State Key Laboratory of Hydroscience cand Engineering Deparment of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

In the present paper,the unsteady cavitating turbulent flow over the twisted NACA66 hydrofoil is investigated based on an modified shear stress transfer k-ωpartially averaged Navier-Stokes(MSST PANS)model,i.e.,new MSST PANS(NMSST PANS)model,where the production term of kinetic energy in the turbulence model is modified with *** with the experimental data,cavitation evolution and its characteristic frequency are satisfactorily predicted by the proposed NMSST PANS *** is revealed that the interaction among the main flow,the reentrant jets,and sheet cavitation causes the formation of the primary shedding cavity near the mid-span and the secondary shedding cavity at each side of the twisted hydrofoil,and further induces the remarkable pressure gradient around shedding *** with the development of the primary and the secondary shedding cavities,the great pressure gradient associated with large cavity volume variation promotes the vortical flow generation and the spatial deformation of vortex structure during cavitation evolution,and results in the primary and the secondary U-type ***,dynamic mode decomposition(DMD)analysis is utilized to confirm the interaction among the main flow,the main reentrant jet and two side reentrant jets,and *** results indicate that the proposed NMSST PANS model is suitable to simulate the complicated cavitating turbulent flow for various engineering applications.

关键词： Cavitating turbulent flow partially averaged Navier-Stokes(PANS)model hydrofoil numerical simulation

Molecular targets and mechanisms of different aberrant alternative splicing in metastatic liver cancer

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World Journal of Clinical Oncology 2024年第4期15卷 531-539页

作者： De-Yi geng Qing-Shan Chen Wan-xian Chen Lin-Sa Zhou Xiao-Sha Han Qi-Hu Xie geng-Hong guo Xue-Fen Chen Jia-Sheng Chen Xiao-Ping Zhong Department of Plastic and Burns Surgery The Second Affiliated Hospital of Shantou University Medical CollegeShantou 515000Guangdong ProvinceChina Plastic Surgery Research Institute Ear Deformities Treatment Center and Cleft Lip and Palate Treatment Center of Shantou University Medical CollegeShantou 515000Guangdong ProvinceChina

Metastasis remains a major challenge in the successful management of malignant *** liver is a major site of metastatic disease and a leading cause of death from gastrointestinal malignancies such as colon,stomach,and pancreatic cancers,as well as melanoma,breast cancer,and *** an important factor that influences the development of metastatic liver cancer,alternative splicing drives the diversity of RNA transcripts and protein subtypes,which may provide potential to broaden the target *** particular,the dysfunction of splicing factors and abnormal expression of splicing variants are associated with the occurrence,progression,aggressiveness,and drug resistance of cancers caused by the selective splicing of specific *** review is the first to provide a detailed summary of the normal splicing process and alterations that occur during metastatic liver *** will cover the role of alternative splicing in the mechanisms of metastatic liver cancer by examining splicing factor changes,abnormal splicing,and the contribution of hypoxia to these changes during metastasis.

关键词： Alternative splicing Carcinoma Hepatocellular Metastasic Liver neoplasms Prognosis

Efficacy of percutaneous mechanical thrombus removal in acute lower extremity deep venous thrombosis

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World Journal of Clinical Cases 2024年第21期12卷 4590-4600页

作者： Jun-Qiang Xue Ping Yin Jian-Ping He Hui Wei Cui-Jie geng Yu-xian Luo Department of Vascular Surgery Shijiazhuang People's HospitalShijiazhuang 050011Hebei ProvinceChina Department of Laboratory Medicine Shijiazhuang Hospital of Traditional Chinese MedicineShijiazhuang 050011Hebei ProvinceChina Catheter Room Shijiazhuang People's HospitalShijiazhuang 050011Hebei ProvinceChina

BACKGROUND Acute lower extremity deep venous thrombosis(LEDVT)is a common vascular emergency with significant morbidity risks,including post-thrombotic syndrome(PTS)and pulmonary *** treatments like catheter-directed thrombolysis(CDT)often result in variable success rates and *** To investigate the therapeutic efficacy of percutaneous mechanical thrombus removal in acute *** A retrospective analysis was performed to examine 58 hospitalised patients with acute LEDVT between August 2019 and August *** patients were categorised into the percutaneous mechanical thrombectomy(PMT)group(n=24)and CDT group(n=32).The follow-up,safety and treatment outcomes were compared between the two *** main observational indexes were venous patency score,thrombus removal effect,complications,hospitalisation duration and *** The venous patency score was 9.04±1.40 in the PMT group and 8.81±1.60 in the CDT group,and the thrombus clearance rate was 100%in both *** complication rate was 8.33%in the PMT group and 34.84%in the CDT group,and the difference was statistically significant(P2.48 days in the PMT group and 8.14±3.56 days in the CDT *** incidence of PTS was lower in the PMT group than in the CDT group;however,the difference was not statistically significant(P<0.05).CONCLUSION Compared with CDT,treatment of LEDVT via PMT was associated with a better thrombus clearance rate,clinical therapeutic effect and PTS prevention function,but the difference was not statistically ***,PMT was associated with a reduced urokinase dosage,shortened hospitalisation duration and reduced incidence of complications,such as infections and small *** results indicate that PMT has substantial beneficial effects in the treatment of LEDVT.

关键词： Post-thrombotic syndrome Catheter-directed thrombolysis Percutaneous mechanical thrombectomy Acute lower extremity deep venous thrombosis

磁场对电子回旋共振中和器等离子体与电子引出影响的数值模拟

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物理学报 2024年第16期73卷 181-189页

作者：罗凌峰杨涓耿海吴先明牟浩西北工业大学航天学院西安710072 兰州空间技术物理研究所真空技术与物理重点实验室兰州730000

10 cm电子回旋共振离子推力器(ECRIT)的ECR中和器是关键部件,其内部磁场是影响中和器性能的重要因素.磁场的均匀性和磁阱位置是磁场特征的重要表现,制约等离子体与电势的分布规律、电子引出过程及中和器性能.本文分别建立磁场均匀性低... 详细信息

10 cm电子回旋共振离子推力器(ECRIT)的ECR中和器是关键部件,其内部磁场是影响中和器性能的重要因素.磁场的均匀性和磁阱位置是磁场特征的重要表现,制约等离子体与电势的分布规律、电子引出过程及中和器性能.本文分别建立磁场均匀性低、磁阱位于电子引出孔上游和磁场均匀性高、磁阱位于电子引出孔下游的ECR中和器PIC/MCC模型,在给定参数条件下,开展等离子体和电势分布规律及电子引出过程的数值模拟研究并分析其对中和器性能的影响.结果表明,磁场均匀性高、磁阱位于电子引出孔下游时,中和器内整体电势分布较均匀,电子容易朝磁阱区迁移,低引出电势引出高电子束流,其性能高于磁场均匀性低、磁阱内置的中和器.研究工作将为发展高性能的ECR中和器奠定重要基础.

关键词：电子回旋共振中和器 PIC/MCC模拟电子引出

Shape-influenced non-reciprocal transport of magnetic skyrmions in nanoscale channel

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Chinese Physics B 2024年第7期33卷 605-611页

作者：陈杰尧罗佳胡更新王君林李冠祺陈振东陆显扬赵国平刘远吴竞徐永兵 School of Integrated Circuits Guangdong University of TechnologyGuangzhou 510006China School of Physics Engineering and TechnologyUniversity of YorkYork YO105DDUnited Kingdom College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610068China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China

Skyrmions, with their vortex-like structures and inherent topological protection, play a pivotal role in developing innovative low-power memory and logic devices. The efficient generation and control of skyrmions in geometrically confined systems are crucial for the development of skyrmion-based spintronic devices. In this study, we focus on investigating the non-reciprocal transport behavior of skyrmions and their interactions with boundaries of various shapes. The shape of the notch structure in the nanotrack significantly affects the dynamic behavior of magnetic skyrmions. Through micromagnetic simulation, the non-reciprocal transport properties of skyrmions in nanowires with different notch structures are investigated in this work.

关键词： skyrmion micromagnetic simulation racetrack memory

A Necessary and Sufficient Condition for the Solvability of the Nonlinear Schr?dinger Equation on a Finite Interval

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Acta Mathematicae Applicatae Sinica 2021年第1期37卷 75-100页

作者： Ruo-meng LI xian-guo geng Zhengzhou University Zhengzhou 450001China

The admissibility of the initial-boundary data,which characterizes the existence of solution for the initial-boundary value problem,is *** on the Fokas method and the inverse scattering transformation,an approach is developed to solve the initial-boundary value problem of the nonlinear Schrodinger equation on a finite interval.A necessary and sufficient condition for the admissibility of the initial-boundary data is given,and the reconstruction of the potential is obtained.

关键词： initial-boundary value problems inverse scattering transform method Fokas method

N-soliton solutions for the nonlocal two-wave interaction system via the Riemann–Hilbert method

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Chinese Physics B 2018年第12期27卷 157-163页

作者： Si-Qi Xu xian-guo geng School of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China College of Civil Engineering Xinyang Normal UniversityXinyang 464000China

In this paper, a nonlocal two-wave interaction system from the Manakov hierarchy is investigated via the Riemann–Hilbert approach. Based on the spectral analysis of the Lax pair, a Riemann–Hilbert problem for the nonlocal two-wave interaction system is constructed. By discussing the solutions of this Riemann–Hilbert problem in both the regular and nonregular cases, we explicitly present the N-soliton solution formula of the nonlocal two-wave interaction system. Moreover,the dynamical behaviour of the single-soliton solution is shown graphically.

关键词： nonlocal two-wave interaction system Riemann–Hilbert problem N-soliton solutions

Darboux Transformation for Tzitzeica Equation

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Communications in Theoretical Physics 2006年第4期45卷 577-580页

作者： ZHU Jun-Yi geng xian-guo Department of Mathematics Zhengzhou University. Zhengzhou 450052 China

We present a Darboux transformation for Tzitzeica equation associated with 3 × 3 matrix spectral *** explicit solution of Tzitzeica equation is obtained,

关键词： Darboux transformation nonlinear evolution equation soliton solutions

A New Integrable Symplectic Map of Neumann Type

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Communications in Theoretical Physics 2007年第4期47卷 577-581页

作者： ZHU Jun-Yi geng xian-guo Department of Mathematics Zhengzhou University Zhengzhou 450052 China

By resorting to the nonlinearization approach, a Neumann constraint associated with a discrete 3 × 3 matrix eigenvalue problem is considered. A new symplectic map of the Neumann type is obtained through nonlinearization of the discrete eigenvalue problem and its adjoint one. The generating function of integrals of motion is presented, by which the symplectic reap＇is further proved to be completely integrable in the Liouville sense.

关键词： Neumann constraint symplectic map Liouville integrablility