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Flower-like Cu5Sn2S7/ZnS nanocomposite for high performance supercapacitor

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Chinese Chemical Letters 2019年第5期30卷 1115-1120页

作者： Feng Yu Vincent Tiing Tiong Le Pang Rusen Zhou Xiaoxiang Wang Eric R.Waclawik Kostya (Ken) Ostrikov Hongxia Wang School of Chemistry Physics and Mechanical Engineering Science and Engineering Faculty Queensland University of Technology

Ternary nanocomposites of CuxZnySnzS(x+y+z)are considered as an emerging potential candidate as electrode materials for energy storage devices due to the considerable interlayer spaces and tunnels in its crystal structures with excellent conducting ***,this nanocomposite used as anode material for Li-ion battery has been reported,but there is lim让ed research on让s application in supercapacitors which is considered a complementary energy storage device to *** this work,flower-like Cu5Sn2S7/ZnS and pristine Cu5Sn2S7 nanocomposite were prepared via a facile hydrothermal *** electrochemical tests showed that the Cu5Sn2S7/ZnS nanocomposite exhibited better performance than pristine Cu5Zn2S7,suggesting that the existence of ZnS could significantly enhance the electrochemical performance of Cu5Sn2S7,with the good capacitance of 200 F/g at the current density of 1 A/*** 170 F/g was obtained at the large current density of 10 A/*** demonstrated energy density of 11.08 Wh/kg with power density 461 W/kg or 9.67 Wh/kg at power density of 4615 W/kg.

关键词： Energy storage Supercapacitors Flower-like nanocomposite Cu5Sn2S7/ZnS Metal sulfide

Primordial black hole from the running curvaton

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Chinese physics C 2023年第1期47卷 252-261页

作者：刘磊华 Department of physics College of PhysicsMechanical and Electrical EngineeringJishou UniversityJishou 416000China

In light of our previous study [Chin. Phys. C 44(8), 085103(2020)], we investigate the possibility of the formation of a primordial black hole in the second inflationary process induced by the oscillation of the curvaton. By adopting the instability of the Mathieu equation, one can utilize the δ function to fully describe the power *** to the running of the curvaton mass, we can simulate the value of the abundance of primordial black holes covering almost all of the mass ranges. Three special cases are given. One case may account for dark matter because the abundance of a primordial black hole is approximately 75%. As late times, the relic of exponential potential may be approximated to a constant of the order of a cosmological constant, which is dubbed as the role of dark ***, our model could unify dark energy and dark matter from the perspective of phenomenology. Finally, it sheds new light on exploring Higgs physics.

关键词： primordial black hole curvaton mechanism power spectrum Mathieu equation

Polarizabilities and Hyperpolarizabilities for Lithium Atoms in Debye Plasmas

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Communications in Theoretical physics 2014年第12期61卷 881-887页

作者：康帅贺娟许宁陈昌永 School of physics and mechanical & Electrical engineering Zunyi Normal College Department of physics Shaoguan University

The effects of plasma environments on energies, oscillator strengths, polarizabilities and hyperpolarizabilities for lithium atom have been calculated by combining the l-dependent model potential of free lithium atom and linear variation method based on B-spline basis functions. The influence of plasma on lithium atom is represented by the Debye screened potential, which describes effectively the averaged effect of the plasma environment on atomic spectra. The results are in agreement with other reported ones.

关键词： plasmas polarizabilities B-spline Debye screened potential Lithium atom

Toward in vivo translation of superresolution localization photoacoustic computed tomography using liquid-state dyed droplets

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Light(Science & Applications) 2019年第1期8卷 676-677页

作者： Wonseok Choi Chulhong Kim departments of Creative IT engineering Electrical EngineeringMechanical EngineeringInterdisciplinary Bioscience and BioengineeringPohang University of Science and TechnologyPohangGyeongbuk 37673Republic of Korea

Super-resolution localization photoacoustic computed tomography has been successfully performed in live animals using an injection of unprecedentedly absorptive liquid-state dyed droplets,which promises a disruptive m... 详细信息

关键词： has translation dis

An energy harvester for all seasons

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National Science Review 2023年第10期10卷 10-11页

作者： Qingping Wang Chris Bowen Department of physics & mechanical and Electronic engineering Hubei University of Education Centre for Integrated Materials Processes and Structures Department of Mechanical EngineeringUniversity of Bath

The harvesting of sunlight,wind,heat and even raindrops to produce electrical energy has attracted significant attention to address the global energy crisis,reduce environmental pollution from fossil fuels,and limit the use of batteries[1-3].One challenge to harvesting renewable energy sources is their inherent variability,

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Development of Experimental Superconducting Magnet for the Collector Ring of FAIR Project

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Plasma Science and Technology 2010年第2期12卷 248-252页

作者：朱银锋吴维越武松涛徐厚昌刘常乐 Institute of Plasma physics Chinese Academy of Sciences School of mechanical and Electrical engineering Anhui University of Architecture Department of mechanical engineering Hefei University

A pool cooled experimental magnet based on the copper stabilized NbTi supercon- ducting wire was designed, fabricated and tested, in order to evaluate the engineering design of the dipole superconducting magnet for the collector ring （CR） of the facility for antiproton and ion research （FAIR） project. In this paper, the experimental setup including quench protection system was presented. Performance of the liquid helium pool cooled test was introduced. All of the results indicate both the performance of conductor and the experimental superconducting magnet under low temperature is stable, which suggests the engineering design are feasible for the formal magnet in CR of the FAIR project.

关键词： collector ring (CR) superconducting magnet cryogenic system quench pro- tection

Synthesis, Structure, and Magnetic and Luminescent Properties of Rare Earth Coordination Polymers Constructed from Mixed Dicarboxylates

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Chinese Journal of Structural Chemistry 2019年第3期38卷 351-361页

作者： Zhang Zhan-Rui FENG Guo-Qiang School of physics Huazhong University of Science and Technology Department of mechanical and Aerospace engineering North Carolina State University Department of physics and mechanical & Electrical engineering Hubei University of Education

Three unique metal-organic framework coordination polymers, [Eu_2(bptc)(bdc)_2(H_2O)]_n(1), [Gd_2(bptc)(bdc)_2(H_2O)_4]_n(2) and [Dy_2(bptc)(bdc)_2(H_2O)_4]n(3)(1,2-H_2 BDC = 1,2-benzenedicarboylic acid, H_2 bptc = 4,4?-biphenyldicarboxylic acid) were synthesized by mixing two different multi-carboxylic acids with Ln2 O3(Ln = Eu, Gd and Dy) in hydrothermal condition. The three compounds are all three-dimensional and compounds 2 and 3 contain 4.289 × 6.507 ?~2 rectangularshaped one-dimensional open channels along the a direction. Additionally, the magnetic, luminescent and thermogravimetric properties were studied in detail.

关键词： metal-organic framework mixed carboxylates rare earth metals physical properties

Time-domain analysis of second-harmonic generation of primary Lamb wave propagation in an elastic plate

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Chinese physics B 2010年第11期19卷 456-464页

作者：邓明晰项延训 Department of physics Logistics Engineering University School of mechanical and Power engineering East China University of Science and Technology

Within the second-order perturbation approximation, this paper investigates the physical process of generation of the time-domain second harmonic by a primary Lamb wave waveform in an elastic plate. The present work is performed based on the preconditions that the phase velocity matching is satisfied and that the transfer of energy from the primary Lamb wave to the double frequency Lamb wave is not zero. It investigates the influences of the difference between the group velocities of the primary Lamb wave and the double frequency Lamb wave, the propagation distance and the duration of the primary Lamb wave waveform on the envelope shape of the time-domain second harmonic. It finds that the maximum magnitude of the envelope of the second-harmonic waveform can grow within some propagation distance even if the condition of group velocity matching is not satisfied. Our analyses also indicate that the maximum magnitude of the envelope of the second-harmonic waveform is kept constant beyond a specific propagation distance. Furthermore, it concludes that the integration amplitude of the time-domain second-harmonic waveform always grows with propagation distance within the second-order perturbation. The present research yields new physical insight not previously available into the effect of generation of the time-domain second harmonic by propagation of a primary Lamb wave waveform.

关键词： Lamb wave second-harmonic generation group velocity matching phase velocity matching

Recent progress on the prediction of two-dimensional materials using CALYPSO

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Chinese physics B 2019年第10期28卷 62-72页

作者： Cheng Tang Aijun Du School of Chemistry Physics and Mechanical Engineering Queensland University of Technology Gardens Point Campus

In recent years, structure design and predictions based on global optimization approach as implemented in CALYPSO software have gained great success in accelerating the discovery of novel two-dimensional(2D) materials. Here we highlight some most recent research progress on the prediction of novel 2D structures, involving elements, metal-free and metal-containing compounds using CALYPSO package. Particular emphasis will be given to those 2D materials that exhibit unique electronic and magnetic properties with great potentials for applications in novel electronics, optoelectronics,magnetronics, spintronics, and photovoltaics. Finally, we also comment on the challenges and perspectives for future discovery of multi-functional 2D materials.

关键词： CALYPSO methodology two-dimensional materials structural prediction