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Basic quantities of the equation of state in isospin asymmetric nuclear matter

Nuclear Science and Techniques 2021年第11期32卷 1-12页

作者： Jie Liu chao gao Niu Wan Chang Xu School of Physics Nanjing UniversityNanjing 210093China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510641China

Based on the Hugenholtz-Van Hove theorem six basic quantities of the EoS in isospin asymmetric nuclear matter are expressed in terms of the nucleon kinetic energy t(k),the isospin symmetric and asymmetric parts of the single-nucleon potentials U_(0)(ρ,k)and U_(sym,i)(ρ,k).The six basic quantities include the quadratic symmetry energy E_(sym,2)(ρ),the quartic symmetry energy E_(sym,4)(ρ),their corresponding density slopes L_(2)(ρ)and L_(4)(ρ),and the incompressibility coefficients K_(2)(ρ)and K_(4)(ρ).By using four types of well-known effective nucleon-nucleon interaction models,namely the BGBD,MDI,Skyrme,and Gogny forces,the density-and isospin-dependent properties of these basic quantities are systematically calculated and their values at the saturation density q_(0)are explicitly *** contributions to these quantities from t(k)U_(0)(ρ,k),and U_(sym,i)(ρ,k)are also analyzed at the norma nuclear density q_(0).It is clearly shown that the first-order asymmetric term U_(sym,1)(ρ,k)(also known as the symmetry potential in the Lane potential)plays a vital role in determining the density dependence of the quadratic symmetry energy E_(sym,2)(ρ).It is also shown that the contributions from the high-order asymmetric parts of the single-nucleon potentials(U_(sym,i)(ρ,k)with i>1)cannot be neglected in the calculations of the other five basic quantities Moreover,by analyzing the properties of asymmetric nuclear matter at the exact saturation densityρ_(sat)(δ),the corresponding quadratic incompressibility coefficient is found to have a simple empirical relation K_(sat,2)=K_(2)(ρ_(0))-4.14L_(2)(ρ_(0))

关键词： Equation of state Symmetry energy HVH theorem Single-nucleon potential

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Reversible photoswitching self-assembly of azobenzene-functionalized hyperbranched polyglycerol induced by host-guest chemistry

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Science China Chemistry 2012年第4期55卷 604-611页

作者： HAN Yi gao chao HE XiaoHua MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Department of Chemistry East China Normal UniversityShanghai 200062China

Reversible assembly and disassembly of rodlike large complex micelles have been achieved by applying photoswitching of supramolecular inclusion and exclusion of azobenzene-functionalized hyperbranched polyglycerol and acyclodextrin as driv ing force, promising a versatile system for selfassembly switched by light. Hydrogennuclear magnetic resonance （H NMR） and Fourier transform infrared （FTIR） spectroscopy were applied to characterize the azobenzenefunctionalized hyperbranched polyglycerol. Atomic force microscopy （AFM）, transmission electron microscopy （TEM） and dynamic laser light scattering （DLS） were employed to investigate and track the morphology of the rodlike large complex micelles before and after irradiation of UV light.

关键词： azobenzene hyperbranched polyglycerol reversible self-assembly host-guest chemistry

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Highly oxidized graphene with enhanced fluorescence and its direct fluorescence visualization

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Science China Chemistry 2014年第4期57卷 605-614页

作者： WENG ZhuLin XU Zhen gao chao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University School of Mathematical and Physical Sciences Hubei University for Nationalities

We prepared hyper-oxidized graphene(HOG) as a form of graphene derivative by additional oxidation of graphene oxide(GO) sheets. HOG, which formed more functional groups and isolated conjugated clusters on the sheets, accordingly showed high solubility in water and alcohols, high transmittance and film transparence, longer fluorescence decay constant time, and enhanced fluorescence in states of solution and solid. By contrast, GO has much weaker fluorescence in solution and its fluorescence is totally quenched in solid. The influences of concentration, metallic ions, and pH on HOG fluorescence in aqueous solution were also investigated in detail. Due to HOG's strong fluorescence, direct visualization was realized on substrates and in solution. In addition, direct 3D fluorescence visualizations of HOG phase in polymer composites were achieved. These results show the great potential of HOG in a broad range of applications, from biological labeling, probes, and drug carriers to highperformance composites and nanomanipulation.

关键词： highly oxidized graphene enhanced fluorescence fluorescent visualization

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Design of a new tandem wings hybrid airship

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Science China(Physics,Mechanics & Astronomy) 2012年第10期55卷 1886-1893页

作者： LI Feng YE ZhengYin gao chao National Key Loboratory of Aerodynamic Design and Research Northwestern Polytechnical UniversityXi'an 710072China

It is scientifically important science value and engineering promising to develop the buoyancy-lift integrated hybrid airship for high attitude *** the numerical method,a new tandem wings hybrid airship with both higher utility value and economy efficiency was obtained and its total performance and technical parameters were analyzed in *** order to further improve the lift-drag characteristics,we implemented the optimization design for aerodynamic configuration of tandem wings hybrid airship via the response surface *** results indicate that the tandem wings hybrid airship has considerable volume efficiency and higher aerodynamic *** optimization,the lift-drag ratio of this hybrid airship was increased by 6.08%.In a given gross lift condition,tandem wings hybrid airship may provide more payload and specific ***,the size of tandem airship is smaller so the demand for skin flexible materials can be *** of this study could serve as a new approach to designing buoyancy-lifting integrated hybrid airship.

关键词： hybrid airship tandem wings numerical simulation aerodynamic configuration optimization design

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Wet-spun poly(ionic liquid)-graphene hybrid fibers for high performance all-solid-state flexible supercapacitors

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Journal of Energy Chemistry 2019年第7期28卷 104-110页

作者： Karthikeyan Gopalsamy Qiuyan Yang Shengying Cai Tieqi Huang Zhengguo gao chao gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials and Technologies of Zhejiang Province Zhejiang University

It is crucial to develop flexible and wearable electronic devices that have attracted tremendous interest due to their merits on compactness,flexibility and high capacitive *** we report the continuously ordered macroscopic poly(ionic liquid)-graphene fibers by wet spinning method via liquid crystal assembly for supercapacitor *** fabricated all-solid-state supercapacitors exhibited a high areal capacitance(268.2 mF cm 2)and volumetric capacitance(204.6 F cm 3)with an outstanding areal energy density(9.31μWh cm-2)and volumetric energy density(8.28 mWh cm-3).The fiber supercapacitors demonstrated exceptional cycle life for straight electrodes of about 10,000 cycles(94.2%capacitance retention)and flexibility at different angles(0°,45°,90°,180°)along with a good flexible cycling stability after 6000 cycles(92.7%capacitance retention).To date,such a novel poly(ionic liquid)-graphene fiber supercapacitors would be a new platform in real-time flexible electronics.

关键词： Graphene fiber Poly(ionic liquid) Wet spinning Supercapacitors Flexibility

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Biosynthetic CdS-Thiobacillus thioparus hybrid for solar-driven carbon dioxide fixation

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Nano Research 2023年第4期16卷 4531-4538页

作者： Guangyu Liu Feng gao Hongwei Zhang Lei Wang chao gao Yujie Xiong Hefei National Laboratory for Physical Sciences at the Microscale and School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science Center350 Shushanhu Rd.Hefei 230031China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Synergistically combining biological whole-cell bacteria with man-made semiconductor materials innovates the way for sustainable solar-driven CO_(2)fixation,showing great promise to break through the bottleneck in traditional chemical photocatalyst ***,most of the biohybrids require uneconomical organic nutrients and anaerobic conditions for the successful cultivation of the bacteria to sustain the CO_(2)fixation,which severely limits their economic viability and applicability for practical ***,we present an inorganic-biological hybrid system composed of obligate autotrophic bacteria Thiobacillus thioparus(***)and CdS nanoparticles(NPs)biologically precipitated on the bacterial surface,which can achieve efficient CO_(2)fixation based entirely on cost-effective inorganic salts and without the restriction of anaerobic *** optimized interface between CdS NPs and *** formed by biological precipitation plays an essential role for *** efficiently receiving photogenerated electrons from CdS NPs and thus changing the autotrophic way from chemoautotroph to *** a result,the *** biohybrid realizes the solar-driven CO_(2)fixation to produce multi-carbon glutamate synthase and biomass under visible-light irradiation with CO_(2)as the only carbon *** work provides significant inspiration for the further exploration of the solar-driven self-replicating biocatalytic system to achieve CO_(2)fixation and conversion.

关键词： biohybrids solar-driven CO_(2)fixation carbon cycle autotrophic bacteria Thiobacillus thioparus cadmium sulfide

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Click chemistry approach to functionalize two-dimensional macromolecules of graphene oxide nanosheets

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Nano-Micro Letters 2010年第3期2卷 177-183页

作者： Liang Kou Hongkun He chao gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University

A facile "click chemistry" approach to functionalize 2D macromolecules of graphene oxide nanosheets with poly(ethylene glycol) of different molecular weights,polystyrene,palmitic acid and various amino acids was ***,TGA,Raman spectroscopy,XPS,XRD,TEM,AFM and SEM were utilized to characterize the *** degree of functionalization was achieved on the flat surfaces of graphene oxide,affording polymer-grafted 2D brushes and amino acids-immobilized nanosheets,which show improved solubility in organic *** click chemistry strategy reported herein provides a facile and general method for functionalization of graphene oxide with macromolecules and desired biomolecules.

关键词： Graphene Click chemistry Chemical modification PEG Amino acids

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Graphene fiber based supercapacitors:Strategies and perspective toward high performances

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Journal of Energy Chemistry 2018年第1期27卷 6-11页

作者： Qiuyan Yang Zhen Xu chao gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization.Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang Province.Zhejiang UniversityHangzhou 310027Zhejiang.China

Modern wearable electronics are thirsty for flexible, lightweight energy storage and supply devices. Flexible fiber-shaped supercapacitors, possess good flexibility, high power density, fast charging capability and long cycle life, becoming a promising option for wearable devices. The past decade has witnessed the emergence of graphene fiber based supercapacitors（GFSCs） as one of the most active vicinity in fiber-supercapactiors, for their excellent properties including high surface area, chemical stability, excellent electrical conductivity, lightweight and mechanical properties. In this perspective, we introduced the basic energy storage mechanisms of GFSCs, followed by the analysis in improving their overall performances, recent advances, and a conclusive discussion on the challenges and opportunities.

关键词： Graphene Fiber Two-dimensional materials Supercapacitors Energy storage

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The classification and assessment of vulnerability of man-land system of oasis city in arid area

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Frontiers of Earth Science 2013年第4期7卷 406-416页

作者： chao gao Jun LEI Fengjun JIN Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Science Beijing 100101 China Key Laboratory of Regional Sustainable Development Modeling Chinese Academy of Science Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China

Oasis city system is the center of the man-land relationship in arid area and it is the most influential spatial and temporal multiple dynamic system. Oasis city system is not only the largest area where artificial disturbances occur at a regional scale but also the most concentrated area of human activity in arid area. In this study, we developed an applicable and convenient method to assess vulnerability of man-land system of oasis cities with vulnerability indicator system, respectively evaluating the sensitivity, adaptability and vulnerability of the eco- environment system, the economic system and the social system. The results showed that the sensitivity and vulnerability of oasis cities in Xinjiang, China have significant differences while their adaptability does little. In order to find the inherent differences in the vulnerability of oasis cities, triangle methodology has been adopted to divide Xinjiang oasis cities into five types. Some adaptive developing policies specific for individual cities are also proposed based on their vulnerability type and constrain- ing factors.

关键词： vulnerability sensitivity man-land system,oasis cities arid area

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Cu-Catalyzed Chemoselective Reduction of N-Heteroaromatics with NH_(3)·BH_(3) in Aqueous Solution

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Chinese Journal of Chemistry 2021年第9期39卷 2504-2508页

作者： chao gao Qingqing Xuan Qiuling Song Institute of Next Generation Matter Transformation College of Chemical Engineering and College of Material Sciences Engineering at Huaqiao University668 Jimei BoulevardXiamenFujian 361021China Key Laboratory of Molecule Synthesis and Function Discovery Fujian Province University College of Chemistry at Fuzhou University FuzhouFujian 350108China State Key Laboratory of Organometallic Chemistry and Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

An efficient catalytic system was successfully developed on reduction of A/-heteroaromatics with H3N-BH3 as hydrogen source in CuSO4 solution,featuri ng excel I e nt chemoselectivity as well as very broad functional group tolera *** challe nging substrates,such as OH-,NH_(2)^(-), Cl^(-),Br^(-),etc.,contained quinolines,quinoxalines,1,5-naphthyridines and quinazolines were all reduced *** nistic studies suggested that[Cu-H]in termediate might be gen erated from NH_(3)·BH_(3)/which was believed to form with H3N-BH3 in CuSO_(4) solution.

关键词： Nitrogen heterocycles NH_(3)·BH_(3) Hydrogen transfer [Cu-H]in termediate Chemoselectivity

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