检索结果-南通市图书馆

Kinetic Simulation of Nonequilibrium Kelvin-helmholtz Instability

Communications in Theoretical Physics 2019年第1期71卷 132-142页

作者：林传栋 kai h.luo 甘延标刘枝朋 Center for Combustion Energy Key Laboratory for Thermal Science and Power Engineering of Ministry of EducationDepartment of Energy and Power Engineering Tsinghua University Department of Mechanical Engineering University College London North China Institute of Aerospace Engineering Department of Physics School of Science Tianjin Chengjian University

The recently developed discrete Boltzmann method(DBM), which is based on a set of uniform linear evolution equations and has high parallel efficiency, is employed to investigate the dynamic nonequilibrium process of Kelvin-helmholtz instability(KhI). It is found that, the relaxation time always strengthens the global nonequilibrium(GNE), entropy of mixing, and free enthalpy of mixing. Specifically, as a combined effect of physical gradients and nonequilibrium area, the GNE intensity first increases but decreases during the whole life-cycle of KhI. The growth rate of entropy of mixing shows firstly reducing, then increasing, and finally decreasing trends during the KhI process. The trend of the free enthalpy of mixing is opposite to that of the entropy of mixing. Detailed explanations are:(i) Initially,binary diffusion smooths quickly the sharp gradient in the mole fraction, which results in a steeply decreasing mixing rate.(ii) Afterwards, the mixing process is significantly promoted by the increasing length of material interface in the evolution of the KhI.(iii) As physical gradients are smoothed due to the binary diffusion and dissipation, the mixing rate reduces and approaches zero in the final stage. Moreover, with the increasing Atwood number, the global strength of viscous stresses on the heavy(light) medium reduces(increases), because the heavy(light) medium has a relatively small(large) velocity change. Furthermore, for a smaller Atwood number, the peaks of nonequilibrium manifestations emerge earlier, the entropy of mixing and free enthalpy of mixing change faster, because the KhI initiates a higher growth rate.

关键词： discrete Boltzmann method Kelvin-helmholtz instability nonequilibrium effect

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Droplet Collision Simulation by a Multi-Speed Lattice Boltzmann Method

引用

Communications in Computational Physics 2011年第5期9卷 1219-1234页

作者： Daniel Lycett-Brown Ilya Karlin kai h.luo Energy Technology Group School of Engineering SciencesUniversity of SouthamptonSO171BJUK Aerothermochemistry and Combustion Systems Lab ETH Zurich8092 ZurichSwitzerland

Realization of the Shan-Chen multiphase flow lattice Boltzmann model is considered in the framework of the higher-order Galilean invariant *** present multiphase lattice Boltzmann model is used in two-dimensional simu... 详细信息

关键词： Multiphase flow lattice Boltzmann method droplets

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Industrial solid wastes to environmental protection materials for removal of gaseous pollutants:A review

引用

Green Energy & Environment 2025年第1期10卷 34-83页

作者： Jiacheng Bao Xin Sun Ping Ning kai Li Jie Yang Fei Wang Lei Shi Maohong Fan Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming650500China College of Engineering and Physical Sciences and School of Energy ResourcesUniversity of WyomingLaramieWY82071USA College of Engineering Georgia Institute of TechnologyAtlantaGA30332USA

The application of industrial solid wastes as environmentally functional materials for air pollutants control has gained much attention in recent years due to its potential to reduce air pollution in a cost-effective *** this review,we investigate the development of industrialwaste-based functional materials for various gas pollutant removal and consider the relevant reaction mechanism according to different types of industrial solid *** see a recent effort towards achieving high-performance environmental functional materials via chemical or physical modification,in which the active components,pore size,and phase structure can be *** review will discuss the potential of using industrial solid wastes,these modified materials,or synthesized materials from raw waste precursors for the removal of air pollutants,including SO_(2),NO_(x),hg^(0),h_(2)S,VOCs,and CO_(2).The challenges still need to be addressed to realize this potential and the prospects for future research *** suggestions for future directions include determining the optimal composition of these materials,calculating the real reaction rate and turnover frequency,developing effective treatment methods,and establishing chemical component databases of raw industrial solid waste for catalysts/adsorbent preparation.

关键词： Industrial solid waste Reaction mechanism Modification method Air pollutants

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular mechanism and research progress of traditional Chinese medicine in the treatment of prostate cancer

引用

Traditional Medicine Research 2025年第1期10卷 62-72页

作者： hai-luo Wang Ruo-Ran Zhang hao Wang Peng Xu Jing-kai Wang Bo Chen hao Xu Deng Pan Yu-Yang Ma Kun Pang Department of Urology Xuzhou Central HospitalXuzhou Clinical School of Xuzhou Medical CollegeXuzhou 221009China Graduate School Jiangsu UniversityZhenjiang 212013China Graduate School Bengbu Medical UniversityBengbu 233040China Department of Urology The Peixian People’s HospitalXuzhou 221699China.

Prostate cancer(PCa)is one of the most common malignant tumors in the male genitourinary system,ranking second in incidence *** Chinese medicine(TCM),as an important component of complementary and alternative medicine,shows unique advantages in cancer *** herbal medicine is usually composed of multiple ingredients and involves multiple signaling pathways,which showed function of inducing apoptosis of cancer cells,arresting the cell cycle,inhibiting invasion and metastasis,reducing drug resistance,and regulating immune *** therapy is also an important treatment of ***,Physical therapy such as acupuncture or Tai Chi and Qigong are gaining increased recognition in the management of PCa,particularly in addressing issues like urinary incontinence and bone metastasis-related *** article reviews the TCM treatment and therapy of PCa,in order to provide new research avenues and treatment options for the treatment of PCa with TCM and improve the quality of life of patients.

关键词： traditional Chinese medicine prostate cancer Chinese herbal medicine physical therapy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

《2024年ESC外周动脉和主动脉疾病管理指南》解读

引用

中国胸心血管外科临床杂志 2025年第1期32卷 14-23页

作者：汤开罗明尧舒畅中国医学科学院北京协和医学院国家心血管病中心阜外医院血管外科心血管疾病国家重点实验室北京100037 国家心血管病中心华中分中心河南心血管病中心阜外华中心血管病医院血管外科郑州大学华中阜外医院郑州450046 云南省阜外心血管病医院血管外科昆明医科大学附属心血管病医院昆明650032

近年来,世界范围内外周动脉和主动脉疾病发病率逐年上升,导致整体人群的心血管死亡率和发病率升高。既往,外周动脉和主动脉疾病相较冠状动脉疾病往往容易漏诊以及延误治疗。《2024年ESC外周动脉和主动脉疾病管理指南》首次将外周动脉和... 详细信息

近年来,世界范围内外周动脉和主动脉疾病发病率逐年上升,导致整体人群的心血管死亡率和发病率升高。既往,外周动脉和主动脉疾病相较冠状动脉疾病往往容易漏诊以及延误治疗。《2024年ESC外周动脉和主动脉疾病管理指南》首次将外周动脉和主动脉疾病合并在一起,整合并且更新了2017年外周动脉疾病和2014年主动脉疾病指南,旨在为全身动脉疾病管理提供标准化的建议,确保患者可以接受连贯、综合的诊断和治疗,从而改善预后。本文对该指南主要内容进行解读,以期为我国现阶段的外周动脉和主动脉疾病临床诊疗工作提供参考和帮助。

关键词：主动脉疾病外周动脉疾病指南解读

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Discrete Boltzmann model with split collision for nonequilibrium reactive flows

引用

Communications in Theoretical Physics 2024年第8期76卷 164-186页

作者： Chuandong Lin kai h.luo huilin Lai Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Department of Mechanical Engineering National University of Singapore10 Kent Ridge Crescent119260Singapore Department of Mechanical Engineering University College LondonTorrington PlaceLondon WC1E 7JEUnited Kingdom School of Mathematics and Statistics Key Laboratory of Analytical Mathematics and Applications(Ministry of Education)Fujian Key Laboratory of Analytical Mathematics and Applications(FJKLAMA)Center for Applied Mathematics of Fujian Province(FJNU)Fujian Normal University350117 FuzhouChina

A multi-relaxation-time discrete Boltzmann model(DBM) with split collision is proposed for both subsonic and supersonic compressible reacting flows, where chemical reactions take place among various components. The physical model is based on a unified set of discrete Boltzmann equations that describes the evolution of each chemical species with adjustable acceleration, specific heat ratio, and Prandtl number. On the right-hand side of discrete Boltzmann equations, the collision,force, and reaction terms denote the change rates of distribution functions due to self-and crosscollisions, external forces, and chemical reactions, respectively. The source terms can be calculated in three ways, among which the matrix inversion method possesses the highest physical accuracy and computational efficiency. Through Chapman-Enskog analysis, it is proved that the DBM is consistent with the reactive Navier-Stokes equations, Fick's law and the Stefan-Maxwell diffusion equation in the hydrodynamic limit. Compared with the one-step-relaxation model, the split collision model offers a detailed and precise description of hydrodynamic, thermodynamic, and chemical nonequilibrium effects. Finally, the model is validated by six benchmarks, including multicomponent diffusion, mixture in the force field, Kelvin-helmholtz instability, flame at constant pressure, opposing chemical reaction, and steady detonation.

关键词： discrete Boltzmann method reactive flow detonation nonequilibrium effect

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Essential Norms of Composition Operators Between hardy Spaces of the Unit Disc

引用

Chinese Annals of Mathematics,Series B 2011年第2期32卷 209-214页

作者： luo luo kai LI Department of Mathematics University of Science and Technology of China Hefei 230026 China

The authors express the essential norms of composition operators between hardy spaces of the unit disc in terms of the natural Nevanlinna counting function.

关键词： Essential norm Composition operators hardy spaces

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

high-throughput generation of uniform droplets from parallel microchannel droplet generators and the preparation of polystyrene microsphere material

引用

Particuology 2023年第6期77卷 136-145页

作者： Shenglong Zhang kai Wang Guangsheng luo State Key Lab of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing100084China Xi'an Modern Chemistry Research Institute Xi'an710065China

To prepare uniform polystyrene particles with ten microns of diameter,a parallel scaling-up strategy for the capillary-assembled stepwise microchannel was developed,which created uniform droplets with high-throughput and formed a large amount of emulsion templates for the polymerization of styrene and *** microchannel droplet generator was robust for the flow rate deviation of the continuous phase in the jetting flow,and droplet generation frequency up to 2.8 x 104 hz was achieved with only four parallel droplet generators,which were much more efficient than the parallelly scaled microfluidic devices working in dripping flow.32-52μm average diameter droplets with 4.5%-8.4%diameter variation coefficients were successfully prepared from the microchannel device fabricated by low-cost 3D-print method,and the droplets were subsequently turned to solid particles via a two-step polymerization in the *** polystyrene particles were further reduced to 16.9-23.5μm with 5.0%-8.6%diameter variation coefficients due to the accompanying emulsion polymerization,and the working capacity of the platform reached hundred milligrams of particles per hour.

关键词： Droplet generation Parallel scale-up Jetting flow Uniform microspheres Microfluidics

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Continuous deacylation of amides in a high-temperature and high-pressure microreactor

引用

Frontiers of Chemical Science and Engineering 2022年第12期16卷 1818-1825页

作者： Pengcheng Zou kai Wang Guangsheng luo State Key Lab of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

The deacylation of amides,which is widely employed in the pharmaceutical industry,is not a fast reaction under normal *** intensify this reaction,a high-temperature and high-pressure continuous microreaction technology was developed,whose space-time yield was 49.4 times that of traditional batch *** the deacylation of acetanilide as a model reaction,the effects of the temperature,pressure,reaction time,molar ratio of reactants,and water composition on acetanilide conversion were carefully *** on the rapid heating and cooling capabilities,the kinetics of acetanilide deacylation at high temperatures were investigated to determine the orders of reactants and activation *** microreaction technology was further applied to a variety of other amides to understand the influence of substituents and steric hindrance on the deacylation reaction.

关键词： amide deacylation microreactor flow chemistry reaction intensification

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Optimal biaxial prestretch ratios of soft dielectric elastomer actuators for maximal voltage-induced displacement

引用

Science China(Technological Sciences) 2023年第10期66卷 2871-2881页

作者： luo kai WU JiaNing ChEN FeiFei School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Meta Robotics Institute Shanghai Jiao Tong UniversityShanghai 200240China

Prestretch plays an indispensable role in programming the voltage-induced deformation of dielectric elastomer actuators(DEAs).however,lacking rational design methods,the level of prestretch is usually determined through time-consuming experiments and trial-and-error *** this paper,we aim to quantitatively determine the optimal biaxial prestretch ratios for maximizing the voltage-induced displacement of *** on the Lagrange method and adjoint sensitivity analysis,we obtain the derivative of the displacement field with respect to the principal prestretch ratios,in which the nonlinearities and complex electromechanical coupling of DEAs are rigorously taken into *** derivative information allows for performing gradient-based optimization at a high convergence *** propose a comprehensive optimization framework connecting the nonlinear finite element analysis and sensitivity analysis to iteratively identify the optimal prestretch *** validate our method on two classical types of DEAs,i.e.,planar DEAs with fixed boundaries and free-standing three-dimensional dielectric elastomer minimum energy structures(DEMES).The simulation and experiment results both show that remarkable improvements in concerned displacements are obtained compared with the non-optimized designs.

关键词： dielectric elastomer prestretch ratios design optimization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：