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Solving a Generalized Jaynes-Cummings Model by Supersymmetric Unitary Transformation

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Chinese Physics Letters 2000年第5期17卷 319-320页

作者： LU Huai-Xin WANG xiao-qin FAN Hong-Yi Department of Physics Changwei Teachers'CollegeWeifangShandong 261043 Department of Material Science and Engineering University of Science and Technology of ChinaHefei 230026

For the generalized Jaynes-Cummings model Hamiltonian which can describe two collectively radiation atoms,we find its supersymmetric *** on supersymmetric quantum mechanics theory,we introduce a supersymmetric unitary transformation,in which the supersymmetric unitary transformation operator can be constructed by supersymmetric generators of the super-Lie algebra,to diagonalize the *** doing so,its eigenvalue and eigenstates are obtained.

关键词： structure. symmetric unitary

Mechanical properties of hot-pressed high-entropy diboride-based ceramics

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Journal of Advanced Ceramics 2020年第4期9卷 503-510页

作者： Ji-Xuan Liu xiao-qin Shen Yue Wu Fei Li Yongcheng Liang Guo-Jun Zhang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringCollege of SciencesInstitute of Functional MaterialsDonghua UniversityShanghai201620China

High-entropy ceramics attract more and more attention in recent ***,mechanical properties especially strength and fracture toughness for high-entropy ceramics and their composites have not been comprehensively *** this work,high-entropy(Ti0.2Zr0.2Hf0.2Nb0.2Ta 0.2)B2(HEB)monolithic and its composite containing 20 vol%SiC(HEB–20SiC)are prepared by hot *** addition of SiC not only accelerates the densification process but also refines the microstructure of HEB,resulting in improved mechanical *** obtained dense HEB and HEB–20SiC ceramics hot pressed at 1800℃exhibit four-point flexural strength of 339±17 MPa and 447±45 MPa,and fracture toughness of 3.81±0.40 MPa·m1/2 and 4.85±0.33 MPa·m1/2 measured by single-edge notched beam(SENB)*** deflection and branching by SiC particles is considered to be the main toughening mechanisms for the HEB–20SiC *** hardness Hv0.2 of the sintered HEB and HEB–20SiC ceramics is 23.7±0.7 GPa and 24.8±1.2 GPa,*** the increase of indentation load,the hardness of the sintered ceramics decreases rapidly until the load reaches about 49 N,due to the indentation size *** on the current experimental investigation it can be seen that the room temperature bending strength and fracture toughness of the high-entropy diboride ceramics are within ranges commonly observed in structure ceramics.

关键词： high-entropy ceramics high-entropy diboride flexural strength fracture toughness indentation size effect

DYNAMIC CORRECTION OF ROUGHNESS IN THE HYDRODYNAMIC MODEL

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Journal of Hydrodynamics 2009年第2期21卷 255-263页

作者： BAO Wei-min ZHANG xiao-qin QU Si-min State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering College of Hydrology and Water Resources Hohai University Nanjing 210098 China

Based on the hydrodynamic model and the Xinanjiang model, the fiver stage forecasting model has been proposed. But its performance is not satisfactory as applied to estuary areas. River roughness is a sensitive parameter in the hydrodynamic model, and its value is related to some substantial uncertainties in the tidal fiver. According to roughness tests, a new method of roughness dynamic correction was developed to improve the performance of the stage model. The method was focused on the usage of observed data for the studied section, and its parameters were analyzed. Nested with the dynamic correction of roughness, the stage model was applied to the tidal reach of the Caoe River. The results demonstrate that the roughness dynamic correction can improve the simulation accuracy of the stage model, and especially has the capacity of reducing the errors at peak stages.

关键词： hydrodynamic model Xinanjiang model roughness test roughness dynamic correction nesting-modeling Caoe River

Fabrication of azobenzene-functionalized porous polymers for selective CO_(2) capture

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Chinese Journal of Chemical Engineering 2022年第3期35卷 24-30页

作者： Ding-Ming Xue Wen-Juan Zhang xiao-qin Liu Shi-Chao Qi Lin-Bing Sun State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China

Many solid adsorbents have been prepared for the CO_(2)*** particular,the photoresponsive adsorbents have attracted extensive interests because of their tunable pore structure and variable responsive behaviors provoked by the external ***,it is challenging to fabricate the photoresponsive adsorbents featured the big CO_(2)capacity and high CO_(2)***,copolymerized between 4-phenylazobenzoyl chloride,2,4,6-trichloro-1,3,5-triazine and melamine,a series of azobenzenefunctionalized porous polymers(PTM-AZOs)are successfully *** PTM-AZOs are verified in possession of proper pore structures,large surface area and photoconductive properties through a series of *** PTM-AZO-2 with the trans-isomerization exhibits the best CO_(2)adsorption amount of 2.7 mmol·g^(-1)(273 K and 0.1 MPa),while the CO_(2)/N_(2)selectivity can reach 2459 and 607 on the trans-and cis-isomerization,*** regulatable pore structures controlled by the photoresponsive azobenzene groups affect the CO_(2)capture performance of the PTM-AZOs.

关键词： Adsorption CO_(2)capture Selectivity Azobenzene Photoresponse

Low-energy-consumption temperature swing system for CO_(2) capture by combining passive radiative cooling and solar heating

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Green Energy & Environment 2024年第3期9卷 507-515页

作者： Ying-Xi Dang Peng Tan Bin Hu Chen Gu xiao-qin Liu Lin-Bing Sun State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)College of Chemical EngineeringNanjing Tech UniversityNanjing211816China

Temperature-swing adsorption(TSA)is an effective technique for CO_(2) capture,but the temperature swing procedure is ***,we report a low-energy-consumption system by combining passive radiative cooling and solar heating for the uptake of CO_(2) on commercial activated carbons(CACs).During adsorption,the adsorbents are coated with a layer of hierarchically porous poly(vinylidene fluoride-co-hexafluoropropene)[P(VdF-HFP)HP],which cools the adsorbents to a low temperature under sunlight through radiative *** desorption,CACs with broad absorption of the solar spectrum are exposed to light irradiation for *** heating and cooling processes are completely driven by solar *** tests under mimicked sunlight using the CACs show that the performance of this system is comparable to that of the traditional ***,under real sunlight irradiation,the adsorption capacity of the CACs can be well maintained after multiple *** present work may inspire the development of new temperature swing procedures with little energy consumption.

关键词： CO_(2)capture Solar heating Passive radiative cooling Temperature swing adsorption

Recent progress in porous organic polymers and their application for CO_(2) capture

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Chinese Journal of Chemical Engineering 2022年第2期35卷 91-103页

作者： Jiajia Wang Lizhi Wang You Wang Du Zhang qin xiao Jianhan Huang You-Nian Liu College of Chemistry and Chemical Engineering Hunan Provincial Key Laboratory of Micro and Nano Material Interface ScienceCentral South UniversityChangsha 410083China

Carbon capture,storage,and utilization(CCSU)is recognized as an effective method to reduce the excessive emission of CO_(2).Absorption by amine aqueous solutions is considered highly efficient for CO_(2) capture from the flue gas because of the large CO_(2) capture capacity and high ***,it is often limited by the equipment corrosion and the high desorption energy consumption,and adsorption of CO_(2) using solid adsorbents has been receiving more attention in recent years due to its simplicity and high *** recently,a great number of porous organic polymers(POPs)have been designed and constructed for CO_(2) capture,and they are proven promising solid adsorbents for CO_(2) capture due to their high Brunauer-Emmett-Teller(BET)surface area(SBET),adjustable pore size and easy *** particular,they usually have rigid skeleton,permanent porosity,and good physiochemical *** this review,we have a detailed review for the different POPs developed in recent years,not only the design strategy,but also the special structure for CO_(2) *** outlook of the opportunities and challenges of the POPs is also proposed.

关键词： Porous organic polymers Selectivity Adsorbent CO_(2)capture

Negative compressibility property in hinging open-cell Kelvin structure

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Chinese Physics B 2021年第5期30卷 536-546页

作者： Meng Ma xiao-qin Zhou Hao Liu Hao-Cheng Wang Key Laboratory of CNC Equipment Reliability Ministry of EducationSchool of Mechanical and Aerospace EngineeringJilin UniversityChangchun 130022China

A new three-dimensional(3D)cellular model based on hinging open-cell Kelvin structure is proposed for its negative compressibility *** is shown that this model has adjustable compressibility and does exhibit negative compressibility for some certain *** further study shows that the images of compressibility are symmetrical about the certain lines,which indicates that the mechanical properties of the model in the three axial directions are interchangeable and the model itself has a certain geometric symmetry.A comparison of the Kelvin model with its anisotropic form with the dodecahedron model shows that the Kelvin model has stronger negative compressibility property in all three ***,a new and potential method to improve negative compressibility property can be derived by selecting the system type with lower symmetry and increasing the number of geometric parameters.

关键词： negative compressibility 3D cellular model open-cell Kelvin structure analytical methods

First-principles study of plasmons in doped graphene nanostructures

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Chinese Physics B 2021年第9期30卷 476-482页

作者： xiao-qin Shu Xin-Lu Cheng Tong Liu Hong Zhang College of Mathematics and Physics Leshan Normal CollegeLeshan 614000China College of Physics Sichuan UniversityChengdu 610065China School of Science Xihua UniversityChengdu 610065China

The operating frequencies of surface plasmons in pristine graphene lie in the terahertz and infrared spectral range,which limits their ***,the high-frequency plasmons in doped graphene nanostructures are studied by the time-dependent density functional *** doping atoms include boron,nitrogen,aluminum,silicon,phosphorus,and sulfur *** influences of the position and concentration of nitrogen dopants on the collective stimulation are investigated,and the effects of different types of doping atoms on the plasmonic stimulation are *** different positions of nitrogen dopants,it is found that a higher degree of symmetry destruction is correlated with weaker optical *** contrast,a higher concentration of nitrogen dopants is not correlated with a stronger *** different doping atoms,atoms similar to carbon atom in size,such as boron atom and nitrogen atom,result in less spectral *** systems with other doping atoms,the absorption is significantly weakened compared with the absorption of the pristine graphene *** energy resonance dots of doped graphene lie in the visible and ultraviolet spectral *** doped graphene nanostructure presents a promising material for nanoscaled plasmonic devices with effective absorption in the visible and ultraviolet range.

关键词： doped graphene absorption spectroscopy time-dependent density functional theory

Systematic investigation of Radix Salviae for treating diabetic peripheral neuropathy disease based on network Pharmacology

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World Journal of Diabetes 2024年第5期15卷 945-957页

作者： Tao Kang xiao qin Yan Chen Qian Yang Department of Neurology Shaanxi Provincial People’s HospitalXi'an 710068Shaanxi ProvinceChina

BACKGROUND Diabetic peripheral neuropathy(DPN)is a debilitating complication of diabetes mellitus with limited available treatment *** Salviae,a traditional Chinese herb,has shown promise in treating DPN,but its therapeutic mech-anisms have not been systematically *** Radix Salviae(Danshen in pinin),a traditional Chinese medicine(TCM),is widely used to treat DPN in ***,the mechanism through which Radix Salviae treats DPN remains ***,we aimed to explore the mechanism of action of Radix Salviae against DPN using network *** The active ingredients and target genes of Radix Salviae were screened using the TCM pharmacology database and analysis *** genes associated with DPN were obtained from the Gene Cards and OMIM databases,a drug-com-position-target-disease network was constructed,and a protein–protein inter-action network was subsequently constructed to screen the main *** Ontology(GO)functional annotation and pathway enrichment analysis were performed via the Kyoto Encyclopedia of Genes and Genomes(KEGG)using *** A total of 56 effective components,108 targets and 4581 DPN-related target genes of Radix Salviae were *** with Radix Salviae for DPN mainly involved 81 target *** top 30 major targets were selected for enrichment analysis of GO and KEGG *** These results suggested that Radix Salviae could treat DPN by regulating the AGE-RAGE signaling pathway and the PI3K-Akt signaling ***,Danshen may affect DPN by regulating inflammation and apoptosis.

关键词： Diabetic peripheral neuropathy Radix Salviae Network pharmacology Systematic investigation