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Reaction kinetics and internal diffusion of Zhundong char gasification with CO

Yun Liu, Jiangyuan Qu, Xuehui Wu, Kai Zhang, Yuan Zhang

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 2, Pages 373-383 doi: 10.1007/s11705-020-1949-2

Abstract: The effect of internal diffusion on char gasification with CO in the temperature range from 1123 K toThe results revealed that the effect of internal diffusion on the initial reaction rate was more significantThus, temperature zones corresponding to chemical reaction and diffusion control were identified.Moreover, the calculated effectiveness factor provided a quantitative estimation of internal diffusion

Keywords： coal char CO₂ gasification internal diffusion pore evolution

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Diffusion process in enzyme–metal hybrid catalysts

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6, Pages 921-929 doi: 10.1007/s11705-022-2144-4

Abstract: Here, we investigated the diffusion process in enzyme–metal hybrid catalysts using Pd/lipase-Pluronicreference to experimental data in previous studies, the Weisz–Prater parameter and efficiency factor of internaldiffusion were calculated to evaluate the internal diffusion limitations in these catalysts.Results indicated that the enhanced catalytic efficiency of hybrid catalysts may arise from the decreased internaldiffusion limitation, size effect of Pd clusters and proximity of the enzyme and metal active sites,

Keywords： enzyme–metal hybrid catalyst internal diffusion proximity effect kinetic model

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Cylindrical particulate internal flows: A review

Lizhong HUANG, Xiang GAO, Jianzhong LIN

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 4, Pages 385-393 doi: 10.1007/s11465-012-0354-z

Abstract:

The study of cylindrical particulate internal flows has wide industrial applicability hence receivedThis article reviews the cylindrical particulate internal flows over the past twenty years.

Keywords： cylindrical particulate flow internal flow

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Current progress on internal medicine in China—2006 Part I

YAO Dingkang, ZHU Liang, ZHAO Xue, MEI Changlin

Frontiers of Medicine 2007, Volume 1, Issue 3, Pages 235-247 doi: 10.1007/s11684-007-0046-y

Abstract: The growing interest has been placed in the current state of Chinaºs internal medicine from all overMany data of internal medicine in China were collected by searching through some of the most prominentBecause there are many researches on the field of internal medicine, just some representative reports

Keywords： internal medicine Chinaºs internal respiration gastroenterology cardiology

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A comprehensive assessment on the durability of gas diffusion electrode materials in PEM fuel cell stack

Arunkumar JAYAKUMAR

Frontiers in Energy 2019, Volume 13, Issue 2, Pages 325-338 doi: 10.1007/s11708-019-0618-y

Abstract: The crucial and expensive component involved in it is the gas diffusion electrode (GDE) and its degradation

Keywords： PEM fuel cell gas diffusion electrode(GDE) gas diffusion layer(GDL) membrane electrode assembly durability

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Unified cycle model of a class of internal combustion engines and their optimum performance characteristics

Shiyan ZHENG

Frontiers in Energy 2011, Volume 5, Issue 4, Pages 367-375 doi: 10.1007/s11708-011-0170-x

Abstract: The unified cycle model of a class of internal combustion engines is presented, in which the influence

Keywords： internal combustion engine irreversibility power output efficiency optimization

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Coupled diffusion of chloride and other ions in saturated concrete

Nattapong DAMRONGWIRIYANUPAP, Linyuan LI, Yunping XI

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3, Pages 267-277 doi: 10.1007/s11709-011-0112-z

Abstract: The diffusion of chloride ions is associated and strongly affected by other ions in the pore solutionstructures was mathematically characterized by the Nernst-Planck equation which considered not only diffusionThe material models of chloride binding capacity and chloride diffusion coefficient were incorporated

Keywords： diffusion chloride concrete Nernst-Planck equation durability

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An Empirical Study on the Internal Control Efficiency of Listed Engineering Companies

Zhi-wen Wang,Jing Tong

Frontiers of Engineering Management 2015, Volume 2, Issue 2, Pages 159-164 doi: 10.15302/J-FEM-2015026

Abstract: The authors carried out an empirical study on the internal control efficiency of publically listed engineeringrelationship of independent director ratios, audit committee quality and auditor independence with the internalpublically listed engineering companies and forward suggestions and recommendations on raising the internal

Keywords： internal control efficiency board of directors independent directors audit committee

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Embankment dam foundation analysis for the decrease of internal erosion likelihood

Marc SMITH

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 4, Pages 431-436 doi: 10.1007/s11709-012-0183-5

Abstract: , pore pressures in sand are higher and thus where the factor of safety against uplift is lower and internal

Keywords： seepage detection geostatistical analysis dam monitoring internal erosion LIDAR survey

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Experimental study of humid air reverse diffusion combustion in a turbulent flow field

GE Bing, ZANG Shusheng, GU Xin

Frontiers in Energy 2007, Volume 1, Issue 4, Pages 428-434 doi: 10.1007/s11708-007-0062-6

Abstract: Experiments were performed to investigate the differences between the propane/air turbulent diffusionreactive flows past bluff-body and the propane/humid air turbulent diffusion reactive flows in the same

Keywords： propane/humid propane/air turbulent bluff-body turbulent diffusion

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Preparation of a Pb loaded gas diffusion electrode and its application to CO

Ang LI, Hua WANG, Jinyu HAN, Li LIU

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 4, Pages 381-388 doi: 10.1007/s11705-012-1216-2

Abstract: A Pb loaded gas diffusion electrode was fabricated and used for the electroreduction of CO to formicThe preparation conditions of the gas diffusion electrode were optimized by adjusting the amounts ofpolytetrafluoroethylene (PTFE) in the gas diffusion layer and acetylene black in the catalytic layer.The electrochemical performance of the as-prepared gas diffusion electrode was studied by chronoamperometryThe optimized gas diffusion electrode showed good catalytic performance for the electroreduction of CO

Keywords： electroreduction carbon dioxide lead catalyst gas diffusion electrode formic acid

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evaluation of renal function using diffusion weighted imaging and diffusion tensor imaging in type 2

Xiaoyan Chen,Wenxia Xiao,Xinchun Li,Jianxun He,Xiaochun Huang,Yuyu Tan

Frontiers of Medicine 2014, Volume 8, Issue 4, Pages 471-476 doi: 10.1007/s11684-014-0365-8

Abstract:

This work aims to estimate the value of diffusion weighted imaging (DWI) and diffusion tensor imagingDWI and DTI scans were performed on bilateral kidney using SE single-shot EPI, and apparent diffusion

Keywords： type 2 diabetes mellitus microalbuminuria diffusion weighted imaging diffusion tensor imaging early-stage

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Magnetohydrodynamic slip flow and diffusion of a reactive solute past a permeable flat plate with suction

Krishnendu BHATTACHARYYA, G. C. LAYEK

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 4, Pages 471-476 doi: 10.1007/s11705-011-1130-z

Abstract: The magnetohydrodynamic (MHD) boundary layer slip flow and solute transfer over a porous plate in the presence of a chemical reaction are investigated. The governing equations were transformed into self-similar ordinary differential equations by adopting the similarity transformation technique. Then the numerical solutions are obtained by a shooting technique using the fourth order Runge-Kutta method. The study reveals that due to the increase in the boundary slip, the concentration decreases and the velocity increases. On the other hand, with an increase in the magnetic field and mass suction, both boundary layer thicknesses decreased. As the Schmidt number and the reaction rate parameter increases, the concentration decreases and the mass transfer increases.

Keywords： slip flow MHD boundary layer reactive solute diffusion flat plate suction/injection

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Advances in polishing of internal structures on parts made by laser-based powder bed fusion

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 1, doi: 10.1007/s11465-022-0724-0

Abstract: The internal structures of metallic products are important in realizing functional applications.In this article, process, basic forms, and applications relevant to L-PBF internal structures are reviewed

Keywords： laser-based powder bed fusion polishing internal structures surface quality surface features post

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Molecular diffusion in ternary poly(vinyl alcohol) solutions

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6, Pages 1003-1016 doi: 10.1007/s11705-021-2121-3

Abstract: The diffusion kinetics of a molecular probe—rhodamine B—in ternary aqueous solutions containing poly(We show that the diffusion characteristics of rhodamine B in such complex systems is determined by aThe presence of glycerol has no noticeable impact on rhodamine B diffusion at low concentration, butsignificantly slows down the diffusion of rhodamine B above 3.9% (w/v) due to a dominating steric inhibitionFurthermore, introducing surfactants (cationic/nonionic/anionic) to the system results in a decreased diffusion

Keywords： fluorescence correlation spectroscopy poly(vinyl alcohol) anomalous diffusion crowding effects dynamic