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Nuclear matter and neutron star properties with the extendedNambu-Jona-Lasinio model

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Chinese Physics C 2019年第3期43卷 82-90页

作者： yan-jun chen Department of Physics and Electronic Science Changsha University of Science and TechnologyChangshaHunan 410114China Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering ChangshaHunan 410114China

An extended Nambu-Jona-Lasinio(eNJL) model with nucleons as the degrees of freedom is used to investigate properties of nuclear matter and neutron stars(NSs),including the binding energy and symmetry energy of the nuclear matter, the core-crust transition density, and mass-radius relation of NSs. The fourth-order symmetry energy at saturation density is also investigated. When the bulk properties of nuclear matter at saturation density are used to determine the model parameters, the double solutions of parameters are obtained for a given nuclear incompressibility. It is shown that the isovector-vector interaction has a significant influence on the nuclear matter and NS properties, and the sign of isovector-vector coupling constant is critical in the determination of the trend of the symmetry energy and equation of state. The effects of the other model parameters and symmetry energy slope at saturation density are discussed.

关键词： neutron stars nuclear matter extended Nambu-Jona-Lasinio model symmetry energy

The study of proto-magnetar winds

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Research in Astronomy and Astrophysics 2010年第3期10卷 244-252页

作者： yan-jun chen Ye-Fei Yuan Department of Physics and Electronic Science Changsha University of Science and Technology Changsha Hunan 410114 Center for Astrophysics University of Science and Technology of China Hefei 230026 China

The velocity profiles and properties of proto-magnetar winds are investigated. It is found that the corotation of wind matter with magnetic field lines significantly affects r-process nucleosynthesis and could lead to... 详细信息

关键词： stars: neutron -- stars: winds outflows -- supernovae: general -- stars magnetic fields -- nuclear reactions nucleosynthesis abundances

Relapsing polychondritis with isolated tracheobronchial involvement complicated with Sjogren's syndrome:A case report

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World Journal of Clinical Cases 2022年第19期10卷 6563-6570页

作者： jun-yan chen Xiao-yan Li chen Zong Department of Pulmonary and Critical Care Medicine The Second Hospital of Shanxi Medical UniversityTaiyuan 030000Shanxi ProvinceChina

BACKGROUNDRelapsing polychondritis (RP) is a rare, long-term, and potentially life-threateningdisease characterised by recurrent paroxysmal inflammation that can involve anddestroy the cartilage of the external ear, nose, larynx, and *** SUMMARYWe here report a case of RP involving solely the tracheobronchial cartilage ring(and not the auricular. nasal or articular cartilage) complicated by Sjögren's syndrome in a 47-year-old female whose delayed diagnosis caused a sharpdecline in pulmonary function. After corticosteroid treatment, her pulmonaryfunction *** such cases, our experience suggested that 18F-fluorodeoxyglucose positronemission tomography/computed tomography (18F-FDG PET/CT) and fiberopticbronchoscopy should be used to diagnose airway chondritis as relapsing polychondritisin the early phase of disease.

关键词： Relapsing polychondritis Tracheobronchial involvement 18F-fluorodeoxyglucose positron emission tomography/computed tomography Fiberoptic bronchoscopy Case report

Impact of Diabetes Mellitus on the Treatment Outcomes of Chemotherapy in Women with Breast Cancer——A Population-Based Prospective Cohort Study

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Journal of Electronic Science and Technology 2015年第1期13卷 87-93页

作者： Yu-Ching chen cheng-Wei Chang Jorng-Tzong Horng yan-jun chen Jin-Tsung yang Department of Bioinformatics Asia University Department of Information Management Hsing Wu University Department of Computer Science and Information Engineering National Central University Office of Physical Education National Central University

There are few population-based data in investigating the impact of diabetes on chemotherapy adverse effects and treatment outcomes of non-metastatic breast cancer. The purpose of this study is to evaluate whether diabetes affects the patterns of use in chemotherapy, toxic effects of chemotherapy, and treatment outcomes for non-metastatic breast cancer in Taiwan. The study results can provide physicians for making a decision whether or not to use chemotherapy based on the individual patients＇ condition.

关键词： Chemotherapy diabetes mellitus national insurance research database non-metastatic breast cancer population-based study

Crust-core transition and dynamical instabilities in neutron stars for model with point-coupling interactions

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Chinese Physics C 2021年第7期45卷 232-239页

作者： yan-jun chen Zi-peng cheng Bin-guang He Department of Physics and Electronic Science Changsha University of Science and TechnologyChangsha 410114China Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering Changsha 410114China

We explore the effects of the density dependence of symmetry energy on the crust-core phase transition and dynamical instabilities in cold and warm neutron stars in the relativistic mean field(RMF)theory with point-coupling interactions using the Vlasov *** role of neutrino trapping is also *** crust-core transition density and pressure,distillation effect,and cluster size and growth rates are *** present work shows that the slope of symmetry energy at saturation,temperature,and neutrino trapping have non-negligible effects.

关键词： crust-core transition dynamical instabilities point-coupling interactions symmetry energy

A Novel Impact Tension Testing for OFHC Copper Bars under Local Strain Controlled

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Chinese Physics Letters 2011年第1期28卷 156-159页

作者： MA Dong-Fang HOU yan-jun chen Da-Nian WU Shan-Xing WANG Huan-Ran Mechanics and Materials Science Research Center Ningbo University Ningbo 315211

A novel high-speed tensile facility （HSTF） with special fixture is applied to research the dynamic failure char- acteristics of oxygen-free higfl-conductivity （OFHC） copper bars at different levels of strain. The experimental tests are numerically simulated involving void evolution, It is indicated that the localized strains at necking region computed with the adjusted Johnson Cook model and the Zerilli Armstrong model are consistent with the experimental results.

关键词： Condensed matter: structural mechanical & thermal

Detection of Nonlinear Behavior Induced by Hard Limiting in Voltage Source Converters in Wind Farms Based on Higher-order Spectral Analysis

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 630-645页

作者： Zetian Zheng Shaowei Huang Qiangsheng Bu chen Shen jun yan State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China State Grid Jiangsu Electric Power Co. Ltd.Research InstituteNanjingChina

In recent years, sub-synchronous oscillation accidents caused by wind power integration have received extensive attention. The recorded constant-amplitude waveforms can be induced by either linear or nonlinear oscillation mechanisms. Hence, the nonlinear behavior needs to be distinguished prior to choosing the analysis method. Since the 1960s, the higher-order statistics(HOS) theory has become a powerful tool for the detection of nonlinear behavior(DNB) in production quality control wherein it has mainly been applied to mechanical condition monitoring and fault diagnosis. This study focuses on the hard limiters of the voltage source converter(VSC) control systems in the wind farms and attempts to detect the nonlinear behavior caused by bi-or uni-lateral saturation hard limiting using the HOS analysis. First, the conventional describing function is extended to obtain the detailed frequency domain information on the bi-and uni-lateral saturation hard limiting. Furthermore, the bi-and tri-spectra are introduced as the HOS, which are extended into bi-and tri-coherence spectra to eliminate the effects of the linear parts on the harmonic characteristics of hard limiting in the VSC control system, respectively. The effectiveness of the HOS in the DNB and the classification of the hard-limiting types is proven, and its detailed derivation and estimation procedure is presented. Finally, the quadratic and cubic phase coupling in the signals is illustrated, and the performance of the proposed method is evaluated and discussed.

关键词： Bi-coherence spectrum detection of nonlinear behavior hard limiting higher-order statistics tri-coherence spectrum voltage source converter wind farms.

Study on the corrosion behavior of 316H stainless steel in molten NaCl–KCl–MgCl_(2) salts with and without purification

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Nuclear Science and Techniques 2023年第12期34卷 123-132页

作者： Hua Ai Xin‑Mei yang Hua‑Jian Liu Bing‑Chuan chen Ling Han Hua Sun yan‑jun chen Yuan Qian Jian‑Qiang Wang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Key Laboratory of Interfacial Physics and Technology Chinese Academy of ScienceShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The corrosion behavior of 316H stainless steel(SS)in the impure and purified Na Cl–KCl–Mg Cl_(2) salt was investigated at700°*** indicate that the main deleterious impurity induced corrosion in the impure salt was the absorbed moisture,present in the form of Mg Cl_(2)·6H_(2)O.316H SS occurred severe intergranular corrosion with a corrosion depth of 130μm for1000 h in the impure Na Cl–KCl–Mg Cl_(2) *** contrast,the purification treatment of molten chloride salt by the dissolved Mg metal can remove the absorbed moisture,and the corresponding reactions were also *** a result,the corrosiveness of Na Cl–KCl–Mg Cl_(2) salt is reduced significantly.316H SS occurred slight uniform corrosion with a depth of less than 5μm for 3000 h in the purified Na Cl–KCl–Mg Cl_(2) salt.

关键词： Stainless steel Alloy Chloride salt Molten salt corrosion High-temperature corrosion

A buffer overflow detection and defense method based on RiSC-V instruction set extension

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Cybersecurity 2024年第2期7卷 28-43页

作者： Chang Liu yan-jun Wu Jing-Zheng Wu chen Zhao Intelligent Software Research Center Institute of SoftwareChinese Academy of SciencesBejingChina University of Chinese Academy of Sciences BeijingChina State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of SciencesBeijingChina

Buffer overflow poses a serious threat to the memory security of modern operating *** overwrites the con-tents of other memory areas by breaking through the buffer capacity limit,destroys the system execution environ-ment,and provides implementation space for various system attacks such as program control flow *** makes it a wide range of harms.A variety of security technologies have been proposed to deal with system security problems including buffer *** example,No eXecute(NX for short)is a memory management technology commonly used in Harvard *** can refuse the execution of code which residing in a specific memory,and can effectively suppress the abnormal impact of buffer overflow on control ***,in recent years,it has also been used in the field of system security,deriving a series of solutions based on NX technology,such as ExecShield,DEP,StackGuard,***,these security solutions often rely too much on the processor archi-tecture so that the protection coverage is insufficient and the accuracy is *** in the emerging system architecture field represented by RiSC-V,there is still a lack of effective solutions for buffer overflow *** the continuous rapid development of the system architecture,it is urgent to develop defense methods that are applicable to different system application environments and oriented to all executable memory spaces to meet the needs of system security ***,we propose BOP,A new system memory security design method based on RISC-V extended instructions,to build a RISC-V buffer overflow detection and defense system and deal with the buffer overflow threat in *** to this method,NX technology can be combined with program control flow analysis,and Nx bit mechanism can be used to manage the executability of memory space,so as to achieve a more granular detection and defense of buffer overflow attacks that may occur in RISC-V system

关键词： RISc-V Operating system security Buffer overflow Control flow hijacking Nx bit Xibop