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The response of plasma parameters and energy transport in the plasma sheet to interplanetary magnetic field B_z

Science China(Technological Sciences) 2021年第7期64卷 1528-1534页

作者： REN GanMing CAO JinBin YANG Jian DUNLOP Malcolm Wray School of Space and Environment Beihang UniversityBeijing100191China Key Laboratory of Space Environment Monitoring and Information Processing of MIIT Beijing102206China

We use 9 years data of Cluster to study the dependencies of plasma parameters and energy transport in the plasma sheet on the lasting time of northward/southward interplanetary magnetic field(IMF). The plasma parameters and energy transport in the plasma sheet always respond to the change of IMF direction by more or less time. The ion density starts to increase/decrease remarkably at 80 min after northward/southward IMF turning. The ion temperature starts to decrease at 25 min after northward IMF turning, whereas it starts to increase at 80 min after southward IMF turning. The earthward convection velocity within15 min after northward IMF turning almost equals to that within 15 min period after southward IMF turning. However at time greater than 15 min after southward IMF turning, the earthward convection velocity under southward IMF starts to remarkably increase. The response time(15 min) of magnetospheric convection velocity is well consistent with the response times of nightside ionospheric convection to southward IMF turning. The enthalpy flux is larger than kinetic flux by about three orders of magnitudes, and thus the enthalpy flux plays a dominant role in the plasma sheet energy transport. The enthalpy flux does not weaken immediately after northward IMF turning. The enthalpy flux within 15 min after northward IMF turning is comparable to or even slightly larger than that within 15 min after southward IMF. The enthalpy flux starts to decrease at times greater than15 min after northward IMF turning, whereas it starts to increase at times greater than 15 min after southward IMF turning. The result that the enhanced energy transport during the 15 min period after northward IMF turning may explain previous observation that substorms frequently occur shortly after northward IMF turning.

关键词： plasma sheet energy transport enthalpy flux response time

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Decoherence-and Dimerization-assisted energy transport in Protomer of Light-Harvesting Complexes

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Communications in Theoretical Physics 2016年第1期65卷 114-120页

作者：周运清李有泉 Department of Physics and Key Laboratory of Oceanographic Big Data Mining & Application of Zhejiang Province Zhejiang Ocean University Zhejiang Institute of Modern Physics and Department of Physics Zhejiang University

We have investigated the dynamics of a protomer coupled to two different decoherent environments,each in a configuration called the spin star *** the quantum mechanics method,in different situations,we obtain the analytical expressions for the transition probability in the protomer *** thermal equilibrium,there exist well-defined ranges of parameters for which decoherent interaction between the protomer and the environment assists energy transfer in the protomer system,while in pure quantum mechanics states,the decoherent interaction assists energy transfer for an eigenstate but against energy transfer for quantum mechanics *** particular,we also find that the dimerization of two bacteriochlorophylls in protomer can always assist energy transfer in certain parameter range,and in the appropriate spin bath energy,the efficiency of energy transport is sensitively depended on the temperature of environments.

关键词： clecoherence assisted energy transport light-harvesting complexes protomer

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Interface-facilitated energy transport in coupled Frenkel-Kontorova chains

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Frontiers of physics 2016年第2期11卷 125-130页

作者： Rui-Xia Su Zong-Qiang Yuan Jun Wang Zhi-Gang Zheng Department of Physics and the Beijing-Hong Kong-Singapore Joint Centre for Nonlinear and Complex Systems (Beijing) Beijing Normal University Beijing 100875 China Science and Technology on Plasma Physics Laboratory Research Center of Laser Fusion China Academy of Engineering Physics Mianyang 621900 China Key Laboratory of Enhanced Heat Transfer and energy Conservation (Ministry of Education) College of Environmental and Energy Engineering Beijing University of Technology Beijing 100124 China College of Information Science and Engineering Huaqiao University Xiamen 361021 China

The role of interface couplings on the energy transport of two coupled Frenkel-Kontorova （FK） chains is explored through numerical simulations. In general, it is expected that the interface cou- plings result in the suppression of heat conduction through the coupled system due to the additional interface phonon-phonon scattering. In the present paper, it is found that the thermal conductivity increases with increasing intensity of interface interactions for weak inter-chain couplings, whereas the heat conduction is suppressed by the interface interaction in the case of strong inter-chain couplings. Based on the phonon spectral energy density method, we demonstrate that the enhance- ment of energy transport results from the excited phonon modes （in addition to the intrinsic phonon modes）, while the strong interface phonon-phonon scattering results in the suppressed energy transport.

关键词： interface couplings energy transport heat conduction phonon-phonon scattering,Frenkel-Kontorova (FK) chains excited phonon modes phonon spectral energy density

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Comparative transcriptomics revealed enhanced light responses, energy transport and storage in domestication of cassava(Manihot esculenta)

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Frontiers of Agricultural Science and Engineering 2016年第4期3卷 295-307页

作者： Zhiqiang XIA Xin CHEN Cheng LU Meiling ZOU Shujuan WANG Yang ZHANG Kun PAN Xincheng ZHOU Haiyan WANG Wenquan WANG The Institute of Tropical Bioscience and Biotechnology (ITBB) Chinese Academy of Tropical Agricultural Sciences (CATAS) Key Laboratory of Biology and Genetic Resources for Tropical Crops Ministry of Agriculture

Cassava is a staple food, feed and bioenergy crop important to the world especially in the *** cassava is characterized by powerful carbohydrate accumulation but its wild progenitor is ***, we investigated the transcriptional differences of eight c DNA libraries derived from developing leaf, stem and storage root of cassava cv. Arg7 and an ancestor line,W14, using next generation sequencing system. A total of41302 assembled transcripts were obtained and from these,25961 transcripts with FPKM≥3 in at least one library were named the expressed genes. A total of 2117, 1963 and3584 transcripts were found to be differentially expressed in leaf, stem and storage root(150 d after planting),respectively, between Arg7 and W14 and ascribed to 103,93 and 119 important pathways in leaf, stem and storage root, respectively. The highlight of this work is that the genes involved in light response, such as those for photosystem I(PSA) and photosystem II(PSB), other genes involved in light harvesting, and some of the genes in the Calvin cycle of carbon fixation were specially upregulated in leaf. Genes for transport and also for key rate-limiting enzymes(PFK, PGK and PK, GAPDH)coupling ATP consumption in glycolysis pathway were predominantly expressed in stem, and genes for sucrose degradation(INVs), amylose synthesis(GBSS) and hydrolysis(RCP1, AMYs), the three key steps of starch metabolism, and transport associated with energy translocation(ABC, AVPs and ATPase) and their upstream transcription factors had enhanced expression in storage root in domesticated cassava. Co-expression networks among the pathways in each organs revealed therelationship of the genes involved, and uncovered some of the important hub genes and transcription factors targeting genes for photosynthesis, transportation and starch biosynthesis.

关键词： cassava comparative transcriptomics energy transport photosynthesis starch synthesis

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Manipulate energy transport via fluorinated spacers towards recordefficiency 2D Dion-Jacobson CsPbI_(3) solar cells

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Science Bulletin 2022年第13期67卷 1352-1361,M0004页

作者： Yutian Lei Zhenhua Li Haoxu Wang Qian Wang Guoqiang Peng Youkui Xu Haihua Zhang Gang Wang Liming Ding Zhiwen Jin School of Physical Science and Technology&Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou UniversityLanzhou 730000China School of Physical Science and Technology&Lanzhou Center for Theoretical Physics&Key Laboratory of Theoretical Physics of Gansu Province Lanzhou UniversityLanzhou 730000China Delft University of Technology Photovoltaic Materials and Devices GroupDelft 2628CDthe Netherlands Institute of Molecular Plus Tianjin UniversityTianjin 300072China Department of Microelectronic Science and Engineering School of Physical Science and TechnologyNingbo UniversityNingbo 315211China Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and TechnologyBeijing 100190China

Two-dimensional(2D)Dion-Jacobson(D-J)-type cesium lead iodide CsPbI_(3) perform remarkably in terms of ***,the complex interactions between spacer and inorganic layers limit its excellent progress in perovskite solar cells(PSCs).Herein,starting from the considerable structural diversity of organic spacers,we engineer 2D CsPbI_(3) with fine-tuning ***,for the first time we embedded fluorinated aromatic cations in 2D D-J CsPbI_(3),and successfully applied it into construction of high-performance *** with constitutive 1,4-diaminobenzene(PDA),the fluorinated 2-fluorobenzene-1,4-diamine(F-PDA)component greatly expands the dipole moment from 0.59 D to 3.47 D,which reduces the exciton binding energy of the system.A theoretical study shows that the spacer layer and inorganic plane are more enriched with charge accumulation in(F-PDA)Csn±1 Pb_(n)I_(3n+1).The results show that(F-PDA)Csn±1Pb_(n)I_(3n+1) demonstrates more significant charge transfer between organic and inorganic layers than(PDA)Csn±1 Pb_(n)I_(3n+1),and it is confirmed in the femtosecond transient absorption ***,the interactions of the fluorinated spacer with the[PbI_(6)]_(4)-plane effectively manipulate the crystallization quality,and thus the ion migration and defect formation of target 2D CsPbI_(3) are *** a result,we obtained a record power conversion efficiency(PCE)beyond 15%for 2D D-J(F-PDA)Cs_(3)Pb_(4)I_(13)(n=4)PSCs with significantly improved environmental stability compared with the three-dimensional(3D)counterparts.

关键词： Dion-Jacobson CsPbI_(3) Fluorinated spacers energy transport Interaction

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A SCATTERING MATRIX MODEL OF SEMICONDUCTOR SUPERLATTICES IN MULTIDIMENSIONAL WAVE-VECTOR SPACE AND ITS DIFFUSION LIMIT

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Chinese Annals of Mathematics,Series B 2003年第2期24卷 167-190页

作者： P.DEGOND ZHANGKAIJUN Mathematiquespourl‘IndustrieetlaPhysique UMRCNRS5640UniversitePaulSabatier118routedeNarbonne31062ToulousecedexFrance. DepartmentofMathematics NortheastNormalUniversityChangchun130024China.

The authors first establish a quantum microscopic scattering matrix model in multidimen-sional wave-vector space, which relates the phase space density of each superlattice cell withthat of the neighbouring cells. Then, in the limit of a large number of cells, a SHE (SphericalHarmonics Expansion)-type model of diffusion equations for the particle number density in theposition-energy space is obtained. The crucial features of diffusion constants on retaining thememory of the quantum scattering characteristics of the superlattice elementary cell (like *** resonances) are shown in order. Two examples are treated with the analyticallycomputation of the diffusion constants.

关键词： Superlattices Scattering matrix model Diffusion approximation Spherical harmonics expansion Drift-diffusion energy transport Transmission resonance

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