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Preparation and phase change performance of na_2h.o_4·12h_2o@poly(lactic acid) capsules for thermal energy storage

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Chinese Journal of Chemical Engineering 2019年第3期27卷 695-700页

作者： na Fan Lang Chen Guoyong Xie Donghong Yin Chak-Tong Au Shuangfeng Yin State Key Laboratory of Chemo/Biosensing and Chemometrics Provincial Hunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing Carbon-dioxide Emissions College of Chemistry and Chemical Engineering Hunan University hunan Tobacco Industry Co. Ltd. College of Chemistry and Chemical Engineering Hunan Institute of Engineering

Micro-encapsulated phase-change materials(micro PCMs) with na_2 h.o_4·12 h_2 o encapsulated in poly(lactic acid)(PLA) shell were prepared by a solvent evaporation–precipitation method that involves the use of a coaxial needle. The effects of PLA concentration, stirring speed, injection rate of core and shell solutions, and polyvinyl alcohol(PVA) concentration on phase change properties were investigated. The thermal properties of microP CMs were characterized by differential scanning calorimetry(DSC). The capsules prepared under the optimal conditions are about 2 mm in diameter and show a latent heat of up to 122.2 J·g^(-1).

关键词： Micro-encapsulated Phase-change materials na2h.o4·12h.o Coaxial needle Poly(lactic acid) Thermal energy storage capsule

Visible-light-induced three-component reaction of quinoxalin-2(1h)-ones,alkenes and CF_(3)So_(2)na leading to 3-trifluoroalkylated quinoxalin-2(1h)-ones

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Chinese Chemical Letters 2021年第1期32卷 258-262页

作者： na Menga Yufen Lv Qishun Liu Ruisheng Liu Xiaohui Zh.o Wei Wei Sch.ol of Chemistry and Chemical Engineering Qufu Normal UniversityQufu 273165China Qinghai Provincial Key Laboratory of Tibetan Medicine Research and Key Laboratory of Tibetan Medicine Research Northwest Institute of Plateau BiologyChinese Academy of SciencesQinghai 810008China

A facile and metal-free visible-light-enabled three-component reaction of quinoxalin-2(1 h)-ones,alkenes and CF_(3)So_(2)na has been developed under air at room *** photocatalytic tandem reaction using 4 CzIPN as the photocatalyst and air as the green oxidant,provides a mild and environmentally friendly approach to access a series of 3-trifluoroalkylated quinoxalin-2(1 h)-ones.

关键词： Metal-free Visible-light-catalysis Three-component reaction Quinoxalin-2(1h)-ones

Panic buying? Food hoarding during the pandemic period with city lockdown

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Journal of Integrative Agriculture 2020年第12期19卷 2916-2925页

作者： h.holly WANG h.o na Sch.ol of Economics&TTGGGI Guizhou UniversityGuiyang 550025P.R.China Department of Agricultural Economics Purdue UniversityIN47907USA Sch.ol of Economics Beijing Technology and Business UniversityBeijing 100084P.R.China

Food hoarding is prevalent during the CoVID-19 *** investigate the mechanism of urban consumers’food hoarding behaviors,we categorize hoarding motives into rational and irrational *** random online survey samples from three cities in China,we employ the multivariate probit model to investigate the rational and irrational motives on food hoarding *** results confirmed the existence of both rational and irrational food hoarding,and also found factors attributing to the different buying *** amount of food at hand and the expectation on the infection possibility of CoVID-19 are two major factors affecting rational *** mood and herd psychology are factors contributing to panic *** study provides an empirical evidence to support intervention policies aiming at mitigating panic buying behavior.

关键词： consumer hoarding behavior panic buying pandemics lockdown food hoarding

不同雨强、坡度和植被覆盖对密云库区坡地产流及磷流失的影响

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水土保持研究 2025年第2期32卷 122-130,139页

作者：庞芳王娜梁致齐邯郸市生态环境局峰峰矿区分局河北邯郸056000 保定泽农环境技术有限公司河北保定071000 河北农业大学资源与环境学院河北保定071000

[目的]磷是造成密云库区水体富营养化的主要因素,探索密云库区坡地产流和磷流失特征,为密云库区水体富营养化污染防控提供数据支撑和理论依据。[方法]采用室内人工模拟降雨试验,研究了在不同降雨强度(40 mm/h,60 mm/h和80 mm/h)、坡度(5... 详细信息

[目的]磷是造成密云库区水体富营养化的主要因素,探索密云库区坡地产流和磷流失特征,为密云库区水体富营养化污染防控提供数据支撑和理论依据。[方法]采用室内人工模拟降雨试验,研究了在不同降雨强度(40 mm/h,60 mm/h和80 mm/h)、坡度(5°,10°和15°)和不同覆盖条件下(裸地和苜蓿)地表径流和壤中流的产流特征以及磷随径流流失的规律。[结果]不同覆盖条件下地表径流和壤中流初始产流时间随降雨强度和坡度的增大而提前;不同覆盖条件下地表径流和壤中流产流速率均随降雨强度的增大而增大;同一降雨强度下,裸地壤中流和苜蓿地表径流产流速率随坡度表现为5°>15°>10°。不同覆盖条件下地表径流和壤中流总磷(TP)流失浓度随降雨强度的增大而增大,同一降雨强度下,两种覆盖条件下地表径流TP流失浓度均在10°坡达到最大,而壤中流TP流失浓度随坡度的增大而增大。不同覆盖条件下地表径流中TP流失量随降雨强度的增大而增大;同一降雨强度下,裸地地表径流TP流失量随坡度增大而增大,苜蓿条件下随坡度表现出10°>15°>5°的规律;苜蓿对径流中TP流失具有良好的阻控效果,阻控效率可达61.17%。不同覆盖条件下,TP随地表径流流失占总流失量的53.76%以上,相关性分析表明降雨强度为密云库区坡地产流及磷流失的主要影响因子。[结论]密云库区坡地产流及磷流失受降雨强度、坡度和植被覆盖的影响,降雨强度为主要影响因子,地表径流是磷流失的主要途径。

关键词：模拟降雨坡地地表径流壤中流磷

Geometrically exact nonlinear analysis of pre-twisted composite rotor blades

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Chinese Journal of Aeronautics 2018年第2期31卷 300-309页

作者： Li'na ShANG Pinqi XIA Dewey h.hoDGES College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Guggenheim Sch.ol of Aerospace Engineering Georgia Institute of Technology

Modeling of pre-twisted composite rotor blades is very complicated not only because of the geometric non-linearity, but also because of the cross-sectional warping and the transverse shear deformation caused by the anisotropic material properties. In this paper, the geometrically exact nonlinear modeling of a generalized Timoshenko beam with arbitrary cross-sectional shape,generally anisotropic material behavior and large deflections has been presented based on hodges＇ method. The concept of decomposition of rotation tensor was used to express the strain in the beam. The variational asymptotic method was used to determine the arbitrary warping of the beam cross section. The generalized Timoshenko strain energy was derived from the equilibrium equations and the second-order asymptotically correct strain energy. The geometrically exact nonlinear equations of motion were established by hamilton＇s principle. The established modeling was used for the static and dynamic analysis of pre-twisted composite rotor blades, and the analytical results were validated based on experimental data. The influences of the transverse shear deformation on the pre-twisted composite rotor blade were investigated. The results indicate that the influences of the transverse shear deformation on the static deformation and the natural frequencies of the pre-twisted composite rotor blade are related to the length to chord ratio of the blade.

关键词： Geometrically exact Nonlinear Pre-twisted composite blade Transverse shear deformation Variational asymptotic Warping

Regulating lithium nucleation and growth by zinc modified current collectors

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nano Research 2020年第1期13卷 45-51页

作者： na Zhang Seung-ho Yu héctor D.Abruna Baker Laboratory Department of Chemistry and Chemical BiologyCornell UniversityIthacaNew York14853USA Department of Chemical and Biological Engineering Korea University145 Anam-roSeongbuk-guSeoul02841Republic of Korea

Lithium metal is commonly regarded as the“holy Grail”anode material for high energy density rechargeable ***,the uncontrollable growth.of Li dendrites has posed safety concerns and thus greatly hindered its large-scale *** we have modified the surface of a commercial anode current collector,Cu foil,with a thin layer of Zn by a facile electroplating method,in order to regulate the Li nucleation and the following growth *** of the formation of a solid solution buffer layer and Li-Zn alloy phases,the Li nucleation overpotential was dramatically reduced,realizing a uniform Li nucleation and a smooth Li plating *** a result,significantly improved long-term cycling performance with a high Coulombic efficiency was achieved by the lith.ophilic Zn coated Cu foil as a current *** cells of Li-LiFePo4 and Li-S using the Li deposited on the Zn modified Cu as the anode,showed increased capacity with low voltage hysteresis and greatly enhanced cycling stability,ascribed to the uniform Li deposition and formation of a stable SEI *** work demonstrates the feasibility of employing lith.ophilic modified Cu foils as Li metal current collectors for practical applications.

关键词： lithium metal anode lithium dendrite current collector zinc layer

Quasiclassical Trajectory Study of the Reaction of CD4 with.o(1D)

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Chinese Journal of Chemical Physics 2015年第4期28卷 -页

作者： Ke-jie Sh.o Bi-na Fu Dong h.Zhang State Key Laboratory of Molecular Reaction Dynamics and Center for Th.oretical and Computational Chemistry Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Extensive quasiclassical trajectory calculations for the o(1D)+CD4 multichannel reaction were carried out on a new global potential energy surface fit by permutationally invariant polynomials. The product branching ratios, translational energy distributions, and angular distributions of oD+CD3, D+CD2oD/CD3o, and D2+DCoD/D2Co product channels were calculated and compared with the available experimental results. Good agreement between th.ory and experiment has been achieved, indicating small isotope effects for the title reaction. The o(1D)+CD4 reaction mainly proceeds th.ough the CD3oD intermediate via the trapped abstraction mechanism, with initial abstraction of the D atom rather than the direct insertion, followed by decomposition of CD3oD into various products.

关键词： Multichannel reaction Reaction dynamics Quasiclassical trajectory Potential energy surface

Some Properties of an operator on L~∞(△)and Its Applications

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Acta Mathematica Sinica,English Series 2007年第10期23卷 1909-1914页

作者： na SUN LMAM and Sch.ol of Mathematical Sciences Peking University Beijing 100871 P. R. China

In this paper, we introduce an operator hμ（z） on L^∞（△） and obtain some of its properties. Some applications of this operator to the extremal problem of quasiconformal mappings are given. In particular, a suffi... 详细信息

关键词： norm hamilton sequence extremal Beltrami coefficient Strebel point

Dynamics and functions of E‑cadherin complexes in epithelial cell and tissue morphogenesis

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Marine Life Science & Tech.ology 2023年第4期5卷 585-601页

作者： na Zhang Matthias häring Fred Wolf Jörg Großhans Deqing Kong Department of Biology Philipps University35043 MarburgGermany Göttingen Campus Institute for Dynamics of Biological Networks(CIDBN) Georg August University Göttingen37073 GöttingenGermany

Cell–cell adhesion is at the center of structure and dynamics of epithelial tissue.E-cadherin–catenin complexes mediate Ca^(2+)-dependent trans-homodimerization and constitute the kernel of adherens *** the basic function of cell–cell adhesion,recent progress sheds light the dynamics and interwind interactions of individual E-cadherin–catenin complex with E-cadherin superclusters,contractile actomyosin and mechanics of the cortex and *** nanoscale architecture of E-cadherin complexes together with cis-interactions and interactions with cortical actomyosin adjust to junctional tension and mechano-transduction by reinforcement or weakening of specific features of the *** post-translational modifications such as phosphorylation and glycosylation have been implicated,their role for specific aspects of in E-cadherin function has remained ***,we provide an overview of the E-cadherin complex in epithelial cell and tissue morphogenesis focusing on nanoscale architectures by super-resolution approaches and post-translational modifications from recent,in particular in vivo,***,we review the computational modelling in E-cadherin complexes and highlight how computational modelling has contributed to a deeper understanding of the E-cadherin complexes.

关键词： nanoscale architectures Phosphorylation Glycosylation Computational modelling