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Influence of multi-photon excitation on the atomic above-threshold ionization

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Chinese physics B 2015年第4期24卷 138-142页

作者：田原野王春成李苏宇郭福明丁大军 Roeterdink Wim-Ga 陈基根曾思良刘学深杨玉军 Institute of Atomic and Molecular physics Jilin University Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy Jilin University department of physics and Materials engineering Taizhou University Data Center for High Energy Density physics Institute of Applied Physics and Computational Mathematics Science and Technology Computational physics Laboratory Institute of Applied Physics and Computational Mathematics

Using the time-dependent pseudo-spectral scheme, we solve the time-dependent Schrodinger equation of a hydrogen- like atom in a strong laser field in momentum space. The intensity-resolved photoelectron energy spectrum in abovethreshold ionization is obtained and further analyzed. We find that with the increase of the laser intensity, the abovethreshold ionization emission spectrum exhibits periodic resonance structure. By analyzing the population of atomic bound states, we find that it is the multi-photon excitation of bound state that leads to the occurrence of this phenomenon, which is in fairly good agreement with the experimental results.

关键词： time-dependent pseudo-spectral scheme above-threshold ionization resonance structure

Crystallization and Hardness of Melt Spun Fe_(73)Si_(13)B_9Nb_4Cu_1 Alloy

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Journal of Materials Science & Technology 2009年第1期25卷 48-52页

作者： J.I. Akhter M. Iqbal M. Siddique M. Ahmad M.A. Haq M.A. Shaikh Z.Q. Hu physics Division Pakistan Institute of Nuclear Science and Technology P. O. Nilore Islamabad Pakistan Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China department of Chemical and Materials engineering Pakistan Institute of Engineering and Applied Sciences P.O. Nilore Islamabad Pakistan

An alloy having composition Fe73Si13B9Nb4Cu1 was synthesized by melt spinning to investigate the kinetics of crystallization. Techniques of differential scanning calorimetry （DSC）, X-ray diffraction （XRD） and Mossbauer spectroscopy were employed to characterize the phases produced due to annealing at various temperatures. High temperature DSC revealed two stage crystallization reactions. First stage, crystallization occurs at temperature around 514℃ with the production of α-Fe （bcc） and Fe3Si phases. In the second stage, Fe2B and α-Fe （Si,Nb） phases were produced. Mossbauer results revealed the formation of Fe3Si, Fe13Si3 and Fe7Si1 in the first stage and Fe3Si, Fe13Si3, Fe2B and α-Fe （Si,Nb） phases in the second stage of crystallization. An abrupt change in average internal magnetic field was observed at 500℃. The maximum hardness value was found for the sample heat-treated at 500℃.

关键词： Amorphous alloy Crystallization Mossbauer spectroscopy Hardness

Stimulated Raman Scattering of a Modulated Laser Beam in Air： a Perturbation Approach

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Chinese physics Letters 2006年第11期23卷 2985-2988页

作者：魏小红钱列加李恪宇朱鹤元范滇元 Research Facility on Advanced Materials State Key Laboratory for Advanced Photonic Materials and Devices Department of Optical Science and Engineering Fudan University Shanghai 200433 Center for High Energy Laser and physics China Academy of Engineering Physics Mianyang 621900

Stimulated Raman scattering （SRS） of a third-harmonic beam of a high-power laser in air is analysed by using a perturbation approach. It is found that intensity modulations of the third-harmonic beam, resulting from the surface ripple of nonlinear crystal, can be significantly enhanced due to SRS, and the gain of instability increases with the spatial period of modulation. Numerical simulations based on the nonlinear coupled-wave equations verify the validity of the perturbation approach.

关键词： SUPERCONTINUUM GENERATION QUALITY DEGRADATION

Synthesis and Room Temperature Ferromagnetism of Flower-shaped Mn Doped ZnO Nanostructures

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Journal of Materials Science & Technology 2011年第6期27卷 513-517页

作者： Y.Q. Chang P.W. Wang R.H. Tang Q.L. Sun Y. Long School of Materials Science and engineering University of Science and Technology Beijing Beijing 100083 China department of physics National Key Laboratory of Mesoscopic Physics Peking University Beijing 100871 China

Large-scale flower-shaped Mn doped ZnO nanostructures have been grown on silicon substrates by simple thermal evaporation at atmospheric *** flower-shaped nanostructure makes up of many nanorods,which are rooted in one *** of X-ray diffraction,high-resolution transmission electron microscopy and Raman spectra results reveal that the products are of single phase with wurtzite *** mapping results show that no impurity clusters exist in the doped *** photoluminescence spectra demonstrate that many oxygen vacancies exist in the doped materials,and the crystal quality is improved and the content of oxygen vacancies is decreased by annealing *** flower-shaped Mn doped ZnO nanostructures exhibit ferromagnetic ordering above room temperature,and its magnetization is decreased by the annealing treatment,which indicates that the magnetic behavior of the doped materials may be related to the interaction between Mn doping and the oxygen vacancies.

关键词： Mn doped ZnO nanomaterials Ferromagnetism Annealing treatment Chemical vapor deposition

Apigenin ameliorates imiquimod-induced psoriasis in C57BL/6J mice by inactivating STAT3 and NF-κB

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Food Science and Human Wellness 2024年第1期13卷 211-224页

作者： Xianshe Meng Shihong Zheng Zequn Yin Xuerui Wang Daigang Yang Tingfeng Zou Huaxin Li Yuanli Chen Chenzhong Liao Zhouling Xie Xiaodong Fan Jihong Han Yajun Duan Xiaoxiao Yang Key Laboratory of Metabolism and Regulation for Major Diseases of Anhui Higher Education Institutes College of Food and Biological EngineeringHefei University of TechnologyHefei 230601China Tianjin Key Laboratory of human Development and Reproductive Regulation Department of General GynecologyTianjin Central Hospital of Gynecology and ObstetricsTianjin 300100China Key Laboratory of Medicinal Chemical Biology Key Laboratory of Bioactive Materials of Ministry of EducationCollege of Life SciencesNankai UniversityTianjin 300071China

Psoriasis is a chronic autoimmune disease featured by patches on the *** is caused by malfunction of immune cells and keratinocytes with inflammation as one of its key ***(API)is a natural flavonoid with anti-inflammatory and immunoregulatory ***,we speculated that API can ameliorate psoriasis,and determined its effect on the development of psoriasis by using imiquimod(IMQ)-induced psoriasis mouse *** results showed that API attenuated IMQ-induced phenotypic changes,such as erythema,scaling and epidermal thickening,and improved splenic *** differentiation of immune cells was restored in API-treated ***,we revealed that API is a key regulator of signal transducer activator of transcription 3(STAT3).API regulated immune responses by reducing interleukin-23(IL-23)/STAT3/IL-17A ***,it suppressed IMQ-caused cell hyperproliferation by inactivating STAT3 through regulation of extracellular signal-regulated kinase 1/2 and nuclear factor-κB(NF-κB)***,API reduced expression of inflammatory cytokines through inactivation of NF-κ*** together,our study demonstrates that API can ameliorate psoriasis and may be considered as a strategy for psoriasis treatment.

关键词： Psoriasis Apigenin Imiquimod Inflammation Signal transducer activator of transcription 3 (STAT3) nuclear factor-κB(NF-κB)

FeNi@CNS nanocomposite as an efficient electrochemical catalyst for N_(2)-to-NH_(3) conversion under ambient conditions

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Journal of Materials Science & Technology 2022年第8期103卷 59-66页

作者： Tayiba Ilyas Fazal Raziq Nasir Ilyas Liuxin Yang Sharafat Ali Amir Zada Syedul Hasnain Bakhtiar Yong Wang Huahai Shen Liang Qiao School of physics University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 10084China department of Chemistry Abdul Wali Khan University of MardanMardanKPK 23200Pakistan Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Institute of nuclear physics and Chemistry Chinese Academy of Engineering PhysicsMianyang 621900China

The electrocatalytic nitrogen reduction reaction(NRR)has emerged as a promising renewable energy source and a feasible strategy as an alternative to Haber-Bosch ammonia(NH_(3))***,finding an efficient and cost-effective robust catalyst to activate and cleave the extremely strong triple bond in nitrogen(N_(2))for electrocatalytic NRR is still a ***,a FeNi@CNS nanocomposite as an efficient catalyst for N_(2) fixation under ambient conditions is *** FeNi@CNS nanocomposite was prepared by a simple water bath process and *** FeNi@CNS is demonstrated to be a highly efficient NRR catalyst,which exhibits better NRR performance with exceptional Faradaic efficiency of 9.83%and an NH_(3) yield of 16.52μg h^(−1) cm^(−2) in 0.1 M Na_(2)SO_(4) aqueous ***,high stability and reproducibility with consecutive 6 cycles for two hours are also demonstrated throughout the NRR electrocatalytic process for 12 ***,the FeNi@CNS catalyst encourages N_(2) adsorption and activation as well as effectively suppressing competitive ***,this earth-abundant FeNi@CNS catalyst with a subtle balance of activity and stability has excellent potential in NRR industrial applications.

关键词： Electrocatalytic nitrogen reduction Transition-metal alloy FeNi@CNS catalyst N_(2)fixation to NH_(3)

Development of Mini-LIA and Primary Experiments

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Chinese physics Letters 2009年第9期26卷 108-110页

作者：程诚廖树清郑曙昕林郁正唐传祥荆晓兵牟凡潘海峰张开志石金水邓建军 Key Laboratory of Particle and Radiation Imaging (Ministry of Education) Tsinghua University Beijing 100084 Key Laboratory of High Energy Radiation Imaging Fundamental Science for National Defense Department of Engineering Physics Tsinghua University Beijing 100084 Institute of Fluid physics China Academy of Engineering Physics Mianyang 621900

Mini-LIA is a miniature of a linear induction accelerator developed by China Academy of engineering physics and Tsinghua University in 2007. It has been constructed with a thermionic cathode in an electron injector and a metglas core in the induction accelerator cavities. A double-pulsed electron beam was produced for the first time in China on the Mini-LIA with a thermionic cathode in the electron gun and a metglas core in the induction accelerator cavities. A double-pulsed beam current of more than 1.1 A was obtained on condition of 80 k V double-pulsed high voltage produced by pulsed power system supplying to the injector and accelerating modules. Some primary experiments for measuring the parameters of Mini-LIA has been performed, and some beam characterizations of Mini-LIA are presented. Further improvement is underway.

关键词： sea surface nonliear interaction numerical method

Single-Particle Properties of Isospin Asymmetric nuclear Matter

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Chinese physics Letters 2012年第1期29卷 60-63页

作者： LI Zeng-Hua ZUO Wei GUO Wen-Jun Institute of Modern physics Department of Nuclear Science and TechnologyFudan UniversityShanghai 200433 Key Laboratory of Applied Ion Beam physics(Ministry of Education) Fudan UniversityShanghai 200433 Institute of Modern physics Chinese Academy of SciencesLanzhou 730000 College of Science University of Shanghai for Science and TechnologyShanghai 200093

The single-particle potentials in isospin asymmetric nuclear matter is investigated in the framework of the Brueck-ner theory by adopting the realistic Bonn B two-body interaction in combination with a consistent microscopic three-body *** rearrangement contribution induced by the ground state correlations to single-nucleon potentials is calculated in terms of the hole-line expansion of the mass *** the modification of this rearrangement term the symmetry potential is discussed as a function of momentum for several isospin asymme.

关键词： force rearrangement symmetry

physics of quantum coherence in spin systems

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Chinese physics B 2019年第2期28卷 5-24页

作者： Maimaitiyiming Tusun Xing Rong Jiangfeng Du CAS Key Laboratory of Microscale Magnetic Resonance and department of Modern physics University of Science and Technology of China Synergetic Innovation Center of Quantum Information and Quantum physics University of Science and Technology of China School of physics and Electronic engineering Xinjiang Normal University

Quantum computation provides a great speedup over its classical counterpart in solving some hard problems. The advantages of quantum computation come from the coherent superposition principle of quantum mechanics. Spin system is one of the most significant candidates to realize quantum computation. In this review, we focus on the recent experimental progress related to quantum coherence and some fundamental concepts such as the uncertainty principle in the spin *** shall first briefly introduce the quantum description of qubit, coherence, and decoherence. Based on this picture,preserving quantum coherence and detection of weak magnetic fields are presented. We also discuss the realization of precise quantum coherent control, adiabatic quantum factorization algorithm, and two aspects of uncertainty relations.

关键词： coherence decoherence magnetic resonance techniques uncertainty relation