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Analytical Result on the Supercurrent Through a Superconductor/Quantum-Dot/Superconductor Junction

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Communications in Theoretical Physics 2002年第7期38卷 103-106页

作者： LI Wei zhu yu lin tsung-han State Key Laboratory for Mesoscopic Physics and Department of Physics Peking University Beijing 100871 China State Key Laboratory for Mesoscopic Physics and Department of Physics Peking University Beijing 100871 China State Key Laboratory for Mesoscopic Physics and Department of Physics Peking University Beijing 100871 China

We present an analytical result for the supercurrent across a superconductor/quantum-dot/superconductor junction. By converting the current integration into a special contour integral, we can express the current as a sum of the residues of poles. These poles are real and give a natural definition of the Andreev bound states. We also use the exact result to explain some features of the supercurrent transport behavior.

关键词： supercurrent, superconductor/quantum-dot/superconductor junction

Andreev Tunneling Through a Ferromagnet/Quantum-Dot/Superconductor System

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Communications in Theoretical Physics 2002年第5期38卷 629-633页

作者： RAO Hong-Hu zhu yu lin tsung-han State Key Laboratory for Mesoscopic Physics and Department of Physics Peking University Beijing 100871 China State Key Laboratory for Mesoscopic Physics and Department of Physics Peking University Beijing 100871 China State Key Laboratory for Mesoscopic Physics and Department of Physics Peking University Beijing 100871 China

We study Andreev tunneling through a ferromagnet/quantum-dot (QD)/superconductor system. By usingnonequilibrum Green function method, the averaged occupation of electrons in QD and the Andreev tunneling currentare studied. Comparing to the norma-metal/quantum-dot/superconductor, the system shows significant changes: (i)The averaged occupations of spin-up and spin-down electrons are not equal. (ii) With the increase of the polarizationof ferromagnetic lead, the Andreev reflection current decreases. (iii) However, even the ferromagnetic lead reaches fullpolarization, the averaged occupation of spin-down electrons is not zero. The physics of these changes is discussed.

关键词： Andreev tunneling, ferromagnet/quantum-dot/superconductor system

A lithiated gel polymer electrolyte with superior interfacial performance for safe and long-life lithium metal battery

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Journal of Energy Chemistry 2021年第4期30卷 313-322页

作者： Jia-Jia yuan Chuang-Chao sun Li-feng Fang You-Zhi Song Yan Yan Ze-lin Qiu yu-Jie Shen han-Ying Li Bao-Ku zhu Key Laboratory of Macromolecular Synthesis and Functionalization(Ministry of Education) Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027ZhejiangChina Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

Rechargeable lithium metal batteries(LMBs)have gained much attention ***,the short lifespan and safety issues restrict their commercial *** we report a novel gel polymer electrolyte(GPE)based on lithiated poly(vinyl chloride-r-acrylic acid)(PVCAALi)to realize dendritesuppressing and long-term stable lithium metal *** chains ensure the quick gelation process and high electrolyte uptake,and lithiated PAA segments enable the increase of mechanical strength,acceleration of lithium-ion transmission and improvement of interfacial *** GPE showed much higher mechanical strength compared with other free-standing GPEs in previous *** displays a superior ionic conductivity of 1.50 m S cm^(-1) and a high lithium-ion transference number of 0.59 at room ***,the lithiated GPE exhibits excellent interfacial compatibility with lithium metal *** symmetrical cells with PVCAALi GPE yield low hysteresis of 50 m V over1000 h at 1.0 m A cm^(-2).And the possible mechanism of the lithiated GPE with improved lithium-ion transfer and interfacial property was ***,both the Li4Ti5O12/Li and lithium-sulfur(Li-S)cells assembled with PVCAALi GPE show outstanding electrochemical performance,retaining high discharge capacities of 133.8 m Ah g^(-1) and 603.8 m Ah g^(-1) over 200 cycles,*** work proves excellent application potential of the highly effective and low-cost PVCAALi GPE in safe and long-life LMBs.

关键词： Lithiation Gel polymer electrolyte Lithium dendrite Safety Lithium metal battery

Design of hadronic calorimeter for DarkSHINE experiment

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Nuclear Science and Techniques 2024年第9期35卷 155-167页

作者： Zhen Wang Rui yuan han-qing Liu Jing Chen Xiang Chen Kim Siang Khaw Liang Li Shu Li Kun Liu Qi-Bin Liu Si-yuan Song Tong sun Xiao-Long Wang yu-feng Wang Hai-Jun Yang Jun-Hua Zhang yu-Lei Zhang Zhi-yu Zhao Chun-Xiang zhu Xu-Liang zhu Yi-Fan zhu tsung-Dao Lee Institute Shanghai Jiao Tong University1 Lisuo RoadShanghai 201210China Institute of Nuclear and Particle Physics School of Physics and Astronomy800 Dongchuan RoadShanghai 200240China Key Laboratory for Particle Astrophysics and Cosmology(MOE) Shanghai Key Laboratory for Particle Physics and Cosmology(SKLPPC)Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200443China Institute of Modern Physics Fudan UniversityShanghai 200443China

The sensitivity of the dark photon search through invisible decay final states in low-background experiments relies sig-nificantly on the neutron and muon veto efficiencies,which depend on the amount of material used and the design of the detector *** paper presents the optimized design of the hadronic calorimeter(HCAL)used in the DarkSHINE experiment,which is studied using a GEANT4-based simulation *** geometry is optimized by comparing a traditional design with uniform absorbers to one that uses different thicknesses at different locations on the detector,which enhances the efficiency of vetoing low-energy neutrons at the sub-GeV *** overall size and total amount of material used in the HCAL are optimized to be lower,owing to the load and budget requirements,whereas the overall performance is studied to satisfy the physical objectives.

关键词： Hadronic calorimeter GEANT4 simulation Neutron background Scintillation detector Dark photon

Tissue engineering for the repair of peripheral nerve injury

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Neural Regeneration Research 2019年第1期14卷 51-58页

作者： Pei-Xun Zhang Na han yu-Hui Kou qing-Tang zhu Xiao-lin Liu Da-Ping Quan Jian-Guo Chen Bao-Guo Jiang Peking University People's Hospital The First Affiliated Hospital of sun Yat-sen University School of Life Science Peking University

Peripheral nerve injury is a common clinical problem and affects the quality of life of patients. Traditional restoration methods are not satisfactory. Researchers increasingly focus on the field of tissue engineering. The three key points in establishing a tissue engineering material are the biological scaffold material, the seed cells and various growth factors. Understanding the type of nerve injury, the construction of scaffold and the process of repair are necessary to solve peripheral nerve injury and promote its regeneration. This review describes the categories of peripheral nerve injury, fundamental research of peripheral nervous tissue engineering and clinical research on peripheral nerve scaffold material, and paves a way for related research and the use of conduits in clinical practice.

关键词： nerve regeneration scaffold biomaterial stem cells nerve growth factor peripheral nerve injury peripheral nerve repair tissue engineering neural regeneration

Influencing Factors for Erectile Dysfunction of Young Adults with No Response to PDE5i

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Current Medical Science 2021年第3期41卷 529-534页

作者： Jin WANG Yan-li WANG Yao HE Sen LI You-peng ZhanG Yong-biao CHENG Jia-lun GUO lin sun yu XIN Yong TANG Zhao-hui zhu han-qing ZENG Department of Urology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China

Erectile dysfunction(ED)is a common male *** orally-administered phosphodiesterase type 5 inhibitors(PDE5 inhibitors)are now recognized as the primary pharmacological treatment method for ED,20%-30%of the patients treated with PDE5 inhibitors exhibit no significant *** study aims to investigate the influencing factors of ED in young adults with no response to PDE5 *** patients who would take PDE5 inhibitors were included and investigated with a *** with no response to PDE5 inhibitors(tadalafil and sildenafil)served as study group,and those with response to PDE5 inhibitors as control *** Chi square test and logistic regression analysis were applied to find the potential influencing *** total,378 ED patients were ***-three(24.6%)cases were non-responsive to PDE5 inhibitors,and the remaining 285(75.4%)responded to PDE5 *** multiple logistic regression analysis,we found that history of drinking(OR=3.152;95%CI 1.672-6.975),spousal noncooperation(OR=2.994;95%CI 1.589-5.638),number of fixed sex partners(OR=0.358;95%CI 0.132-0.651),duration of ED(OR=3.356;95%CI 1.352-8.333),and depression(OR=3.689;95%CI 1.579-8.979)could be the influencing factors for ED patients’non-response to PDE5 *** conclusion,history of drinking,spousal noncooperation,number of fixed sex partner,long duration of ED,and depression could be the influencing factors for ED patients'non-response to PDE5 *** and doctors should pay attention to these factors.

关键词： erectile dysfunction PDE5 inhibitors influencing factor

Various mechanisms of the π-junction transition in superconductor / quantum-dot / superconductor systems

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Various mechanisms of the π-junction transition in supercon...

Measurement of the neutron total cross section of carbon at the Back-n white neutron beam of CSNS

CCAST“半导体纳米系统理论”研讨会

作者： yu zhu qing-feng sun and tsung-han linState Key Laboratory for Mesoscopic Physics andDepartment of Physics Peking University.

＜正＞ Using the Keldysh Green function technique, we study the π-junction transition in a superconductor / quantum-dot / superconductor （S-QD-S） system, and provide a unified understanding of the π-junction transition caused by three different mechanisms: （1） Zeeman splitting;（2） Intra-dot interaction;（3） Non-equilibrium distribution. The physics can be described by Andreev bound states and the corresponding current-carrying density of states. Finally, the microwave-induced π-junction is also discussed.

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Nuclear Science and Techniques 2019年第9期30卷 73-82页

作者： Xing-Yan Liu Yi-Wei Yang Rong Liu Jie Wen Zhong-Wei Wen Zi-Jie han Zhi-Zhou Ren Qi An Huai-Yong Bai Jie Bao Ping Cao Qi-Ping Chen Yong-Hao Chen Pin-Jing Cheng Zeng-Qi Cui Rui-Rui Fan Chang-qing feng Min-Hao Gu feng-Qin Guo Chang-Cai han Guo-zhu He Yong-Cheng He yue-feng He han-Xiong Huang Wei-ling Huang Xi-Ru Huang Xiao-Lu Ji Xu-Yang Ji Hao-yu Jiang Wei Jiang han-Tao Jing ling Kang Ming-Tao Kang Bo Li Lun Li Qiang Li Xiao Li Yang Li Yang Li Shu-Bin Liu Guang-yuan Luan Ying-lin Ma Chang-Jun Ning Bin-Bin Qi Jie Ren Xi-Chao Ruan Zhao-Hui Song Hong sun Xiao-Yang sun Zhi-Jia sun Zhi-Xin Tan Hong-qing Tang Jing-yu Tang Peng-Cheng Wang Qi Wang Tao-feng Wang Yan-feng Wang Zhao-Hui Wang Zheng Wang qing-Biao Wu Xiao-Guang Wu Xuan Wu Li-Kun Xie han Yi Li yu Tao yu Yong-Ji yu Guo-Hui Zhang Jing Zhang lin-Hao Zhang Li-Ying Zhang qing-Min Zhang Qi-Wei Zhang Xian-Peng Zhang yu-Liang Zhang Zhi-Yong Zhang Ying-Tan Zhao Liang Zhou Zu-Ying Zhou Dan-Yang zhu Ke-Jun zhu Peng zhu Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics State Key Laboratory of Particle Detection and Electronics Chinese Academy of Sciences(CAS) Department of Modern Physics University of Science and Technology of China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking University Key Laboratory of Nuclear Data China Institute of Atomic Energy Institute of High Energy Physics Chinese Academy of Sciences(CAS) Spallation Neutron Source Science Center University of South China Northwest Institute of Nuclear Technology Department of Engineering and Applied Physics University of Science and Technology of China Beihang University Xi’an Jiaotong University

To verify the performance of the neutron total cross-sectional spectrometer, the neutron total cross section of carbon is initially measured in the energy range of 1 eV to 20 MeV using the time-of-flight method. The measurement is performed at the Back-n white neutron source with a 76-m time-of-flight path using the China Spallation Neutron Source. A multilayer fast fission chamber with 235U and 238U is employed as the neutron detector. The diameter and thickness of the natural graphite sample are 70 mm and 40 mm, respectively. Signal waveforms are collected using a data acquisition system. Off-line data processing was used to obtain the neutron time-of-flight spectra and transmissions. The uncertainty of the counting statistics is generally approximately 3% for each bin in the energy range of 1–20 MeV. It is determined that the results for the neutron total cross section of carbon obtained using ^235U cells are in good agreement with the results obtained using 238U cells within limits of statistical uncertainty. Moreover, the measured total cross sections show good agreement with the broadening evaluated data.

关键词： CSNS Back-n white neutron source NTOX Neutron total cross section Carbon Multilayer fast fission chamber

Prospective study of light dark matter search with a newly proposed DarkSHINE experiment

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Science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 124-138页

作者： Jing Chen Ji-yuan Chen Jun-feng Chen Xiang Chen Chang-Bo Fu Jun Guo Le He Zheng-Ting He Kim Siang Khaw Jia-lin Li Liang Li Shu Li Meng Lv Dan-Ning Liu han-qing Liu Kun Liu Qi-Bin Liu Yang Liu Ze-Jia Lu Cen Mo Si-yuan Song Xiao-Long Wang yu-feng Wang Zhen Wang Zi-Rui Wang Wei-Hao Wu Dao Xiang Hai-Jun Yang Jun-Hua Zhang yu-Lei Zhang Zhi-yu Zhao Xu-Liang zhu Chun-Xiang zhu Yi-Fan zhu tsung-DaoLee Institute Shanghai Jiao Tong UniversityShanghai 201210China Institute of Nuclear and Particle Physics School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Particle Astrophysics and Cosmology(MOE) Shanghai Key Laboratory for Particle Physics and Cosmology(SKLPPC)Shanghai 200240China Center for High Energy Physics Peking UniversityBeijing 10087lChina School of Mechanical and Electronic Engineering Suzhou UniversitySuzhou 234000China School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China School of Electronics Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China R&D Center Shanghai Instituteof CeramicsChinese Academyof SciencesShanghai 20189China Key Laboratory of Nuclear Physics and lon-beam Application(MOE) Fudan UniversityShanghai 200443China Institute of Modern Physics Fudan UniversityShanghai 200443China IKey Laboratory for Laser Plasmas(MOE) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Zhangjiang Institute for Advanced Study Shanghai JiaoTong UniversityShanghai 200240.China College of Literature Scienceand the ArtsUniversity of MichiganAnn Arbor MI 48109-1040USA Deparment of Physics Swiss Federal Institnute of Technology ZurichZurich 8093Swizerland

Dark photons have been well motivated as strong candidates for dark force carriers and light dark matter in the sub-GeV mass *** with collider experiments,fixed-target experiments provide a complementary approach to searching for dark photons,particularly in the lower mass *** have studied the physics potential of the electron-on-target experiment based on the Shanghai SHINE facility,which provides 10 MHz single electron beam at 8 GeV *** analysis focuses on dark photons being produced via electron and nucleon interaction and then decays to dark matter candidates,which escape detection as missing momentum in the *** experiment takes advantage of using missing momentum to enhance signal versus background separation *** this study,signal samples as a function of dark photon mass and an inclusive background sample with 2.5 billion events are simulated with *** better background estimates,major rare background processes have also been *** paper presents the experiment and detector design,signal and background simulations,analysis strategy,and the prospective study of the experiment *** 9×10^(14) electron-on-target events(about three years running),this experiment is expected to rule out most of the sensitive regions predicted by popular dark photon models.

关键词： dark matter dark photon electron-on-target experiment

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