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液态金属堆蒸汽发生器螺旋管束流动传热特性研究

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热力发电 2025年第2期54卷 109-117页

作者：谢海燕聂鑫赖建永田雅婧中国核动力研究设计院核反应堆技术全国重点实验室四川成都610213

液态金属堆的螺旋管蒸汽发生器一次侧为液态金属工质、二次侧为水工质,其热工水力特性相比传统压水堆的自然循环饱和式蒸汽发生器有较大区别。提出将螺旋管蒸汽发生器等效为流动网络系统的方法,将螺旋管束分为流动回路、压力节点等元件... 详细信息

液态金属堆的螺旋管蒸汽发生器一次侧为液态金属工质、二次侧为水工质,其热工水力特性相比传统压水堆的自然循环饱和式蒸汽发生器有较大区别。提出将螺旋管蒸汽发生器等效为流动网络系统的方法,将螺旋管束分为流动回路、压力节点等元件;基于质量守恒、动量守恒、能量守恒等方程,建立了计算蒸汽发生器螺旋管回路的压降、流量和温度等热工水力参数的数学模型和管束金属壁温计算的数学模型;通过对流动回路未知流量、压力节点组成的非线性方程组进行直接求解,最终得到了螺旋管束内流量分配、压降、工质温度变化、出口汽温分布、壁温分布、干度及换热系数等变化情况,获得了蒸汽发生器螺旋管束流动传热特性,开发了除RELAP5外的一维系统分析计算程序,并完善了液态金属堆螺旋管束蒸汽发生器热工水力计算分析手段。

关键词：液态金属堆蒸汽发生器螺旋管束流动网络流动传热特性热工水力

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Simulation and evaluation study of atmospheric aerosol nonsphericity as a function of particle size

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Particuology 2024年第7期90卷 281-291页

作者： Qianjun Mao xin nie School of Urban Construction Wuhan University of Science and TechnologyWuhan430065China College of New Energy and Materials Northeast Petroleum UniversityDaqing163318China

Aerosol nonsphericity causes great uncertainty in radiative forcing assessments and climate *** considerable studies have attempted to quantify this uncertainty,the relationship between aerosol nonsphericity and particle size is usually not considered,thus reducing the accuracy of the *** this study,a coupled inversion algorithm combining an improved stochastic particle swarm optimization algorithm and angular light scattering is used for the nonparametric estimation of aerosol nonsphericity variation with particle size,and the optimal sample selection method is employed to screen the *** on the verification of inversion accuracy,the variation of aerosol aspect ratio with particle size based on the ellipsoidal model in global regions has been obtained from Aerosol Robotic Network(AERONET)data,and the effect of nonsphericity on radiative forcing and dry deposition has been *** results show that the aspect ratio increases with particle size in all regions,with the maximum ranging from 1.4 to 1.8 in the desert,reflecting the differences in aerosol composition at different particle *** radiation calculations,considering aerosol nonsphericity makes the aerosol cooling effect weaker and surface radiative fluxes increase,but hardly changes the aerosol absorption,with maximum differences of 9.22%and 22.12%at the bottom and top of the atmosphere,***,the differences in radiative forcing between aspect ratios as a function of particle size and not varying with particle size are not significant,averaging less than 2%.Besides,the aspect ratio not varying with particle size underestimates the deposition velocity of small particles and overestimates that of large particles compared to that as a function of particle size,with maximum differences of 7%and 4%,respectively.

关键词： Aerosol nonsphericity Inversion Aspect ratio Radiative forcing Dry deposition velocity

井冈山时期中国共产党民主政治建设的内容和启示研究

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理论界 2025年第1期 32-39页

作者：聂鑫黄嘉玮沈阳航空航天大学马克思主义学院吉林大学

井冈山时期是中国共产党在大革命失败后开始独立探求中国革命道路的新时期,党在此期间的民主政治建设实践逐渐探索形成了坚持党的绝对领导、运用群众路线开展民主政治工作、加强民主政治制度建设等重要内容与宝贵经验,对我国新时期推进... 详细信息

井冈山时期是中国共产党在大革命失败后开始独立探求中国革命道路的新时期,党在此期间的民主政治建设实践逐渐探索形成了坚持党的绝对领导、运用群众路线开展民主政治工作、加强民主政治制度建设等重要内容与宝贵经验,对我国新时期推进民主政治建设具有重要现实启示。

关键词：民主政治建设井冈山时期中国共产党

Scattering Analysis and Optimization of Spherical Acoustic Cloak with Unideal Pentamode Material

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Acta Mechanica Solida Sinica 2020年第3期33卷 347-360页

作者： xin nie Yi Chen Xiaoning Liu Key Laboratory of Dynamics and Control of Flight Vehicle Ministry of EducationSchool of Aerospace EngineeringBeijing Institute of TechnologyBeijing 100081China

The acoustic scattering is theoretically studied in this paper for three-dimensional spherical cloak composed of unideal pentamode material,for which small shear rigidity is always inevitable for a real designed microstructure.A theoretical formulation is developed to efficiently evaluate the cloaking *** generic scattering feature of the cloak and the efTects of material imperfectness and inner cloak boundary constraints are systematically *** preferable constraint type and the critical imperfectness parameter of the material are identified for possible broadband *** addition,a very practical lining shell scheme is proposed to tune the constraint strength on the inner *** combining the theoretical model with optimization algorithm,it is further proved that the cloak can be reduced by several piecewiseuniform layers and optimized to achieve excellent invisibility in targeted frequency *** study will provide valuable guidance for the future microstructural design of cloaks.

关键词： Pentamode material Spherical acoustic cloak Scattering calculation Boundary effect Optimization

Au nanostructures:an emerging prospect in cancer theranostics

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Science China(Life Sciences) 2012年第10期55卷 872-883页

作者： nie xin CHEN ChunYing CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety National Center for Nanoscience and Technology of ChinaBeijing 100190China

Au nanoparticles have been used in biomedical applications since ancient times. However, the rapid development of nanotechnology over the past century has led to recognition of the great potential of Au nanoparticles in a wide range of applications. Advanced fabrication techniques allow us to synthesize a variety of Au nanostructures possessing physiochemical properties that can be exploited for different purposes. Functionalization of the surface of Au nanoparticles further eases their application in various roles. These advantages of Au nanoparticles make them particularly suited for cancer treatment and diagnosis. The small size of Au particles enables them to preferentially accumulate at tumor sites to achieve in vivo targeting after systemic administration. Efficient light absorption followed by rapid heat conversion makes them very promising in photothermal therapy. The facile surface chemistry of Au nanoparticles eases delivery of drugs, ligands or imaging contrast agents in vivo. In this review, we summarize recent development of Au nanoparticles in cancer theranostics including imaging-based detection, photothermal therapy, chemical therapy and drug delivery. The multifunctional nature of Au nanoparticles means they hold great promise as novel anti-cancer therapeutics.

关键词： Au nanoparticle anti-tumor activity photothermal therapy drug delivery surface plasmon resonance diagnostics

Investigation on the spatial-polarizational correlation based on 3GPP spatial channel model

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Science China(Information Sciences) 2014年第2期57卷 80-91页

作者： nie xin ZHANG JianHua ZHANG Ping Beijing Institute of Spacecraft System Engineering Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and Telecommunications

The correlation among signals arriving at diferent elements of the antenna array has a significant impact on the performance of multiple-input multiple-output(MIMO)*** investigate the inter-element correlation when slant polarized antennas are used,a general approach for calculating the correlation coefcient is proposed based on a model that incorporates the antenna configuration,namely the antenna spacing and the slant angle,as well as the channel parameters,such as the power azimuth spectrum(PAS)and the crosspolarization discrimination(XPD).By applying this method to the 3rd generation partnership project(3GPP)spatial channel model(SCM),the expression of the inter-element correlation when the PAS follows the Laplacian distribution is *** approximate expressions are also given for two special cases,i.e.,the case where the angular spread(AS)of the PAS is small,and the case where the AS is so large that the PAS can be approximated by the uniform *** these expressions,the impact of the antenna configuration and the channel parameters on the correlation is *** that,the trend of inter-element correlation with the slant angle is ***,the equivalent relation between the slant angle and the antenna spacing is *** results can provide guidelines for the antenna configuration under diferent propagation conditions.

关键词： inter-element correlation slant polarized antennas power azimuth spectrum cross-polarization discrimination

A spin-rotation mechanism of Einstein-de Haas effect based on a ferromagnetic disk

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Frontiers of physics 2024年第5期19卷 153-165页

作者： xin nie Jun Li Trinanjan Datta Dao-xin Yao Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and TechnologiesCenter for Neutron Science and TechnologySchool of PhysicsSun Yat-Sen UniversityGuangzhou 510275China Department of Physics and Biophysics Augusta University112015th StreetAugustaGeorgia 30912USA Kavli Institute for Theoretical Physics University of CaliforniaSanta BarbaraCalifornia 93106USA International Quantum Academy Shenzhen 518048China

Spin-rotation coupling(SRC)is a fundamental interaction that connects electronic spins with the rotational motion of a *** elucidate the Einstein-de Haas(EdH)effect and its inverse with SRC as the microscopic mechanism using the dynamic spin-lattice equations derived by elasticity theory and Lagrangian *** applying the coupling equations to an iron disk in a magnetic field,we exhibit the transfer of angular momentum and energy between spins and lattice,with or without *** timescale of the angular momentum transfer from spins to the entire lattice is estimated by our theory to be on the order of 0.01 ns,for the disk with a radius of 100 ***,we discover a linear relationship between the magnetic field strength and the rotation frequency,which is also enhanced by a higher ratio of Young’s modulus to Poisson’s *** the presence of damping,we notice that the spin-lattice relaxation time is nearly inversely proportional to the magnetic *** explorations will contribute to a better understanding of the EdH effect and provide valuable insights for magneto-mechanical manufacturing.

关键词： Einstein-de Haas effect spin-rotation coupling

Development of piezoelectric energy-harvesting tuned mass damper

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Science China(Technological Sciences) 2017年第3期60卷 467-478页

作者： PAN Peng ZHANG DongBin nie xin CHEN HaoWen Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Tsinghua University Beijing 100084 China Department of Civil Engineering Tsinghua University Beijing 100084 China

Tuned mass dampers（TMDs）are one of the most widely used devices to mitigate vibrations in ***,in conventional TMDs,viscous dampers convert the energy of vibration into heat.A new type of TMDs,called regenerative TMD... 详细信息

关键词： piezoelectric tuned mass damper regenerative vibration control energy harvesting

Seismic performance evaluation of an infilled rocking wall frame structure through quasi-static cyclic testing

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 371-383页

作者： Pan Peng Wu Shoujun Wang Haishen nie xin Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil Engineering Tsinghua University Department of Civil Engineering Tsinghua University

Earthquake investigations have illustrated that even code-compliant reinforced concrete frames may suffer from soft-story *** damage mode results in poor ductility and limited energy *** components offer alternatives that may avoid such failures.A novel infilled rocking wall frame system is proposed that takes advantage of continuous component and rocking *** studies have investigated similar systems that combine a reinforced concrete frame and a wall with rocking behavior ***,a large-scale experimental study of a reinforced concrete frame combined with a rocking wall has not been *** this study,a seismic performance evaluation of the newly proposed infilled rocking wall frame structure was conducted through quasi-static cyclic *** joints were designed and *** models were established and calibrated to estimate frame shear *** results evaluation demonstrate that an infilled rocking wall frame can effectively avoid soft-story *** and initial stiffness are greatly improved and self-centering behavior is achieved with the help of the infilled rocking *** distribution becomes more uniform with *** cracks and damage occurs in desired *** infilled rocking wall frame offers a promising approach to achieving seismic resilience.

关键词： infilled rocking wall frame seismic performance displacement distribution quasi-static cyclic test