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Effect of carboxymethyl cellulose on dissolution kinetics of carboxymethyl cellulose-sodium carbonate two-component tablet

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Chinese Journal of Chemical Engineering 2017年第10期25卷 1545-1550页

作者： changdong li Carlos Amador Yulong Ding Institute of Particle Science and Engineering University of Leeds Leeds UK School of Engineering University of Warwick. Coventry. CV4 7AL UK Procter & Gamble Newcastle-Upon-Tyne Innovation Centre Newcastle UK School of Chemical Engineering University of Birmingham Birmingham UK

Sodium carbonate and carboxymethyl cellulose powders are compressed into two-component tablets with three mass ratios,97%:3%,95%:5% and 93%:7%.The dissolution tests for two-component tablets and reference pure sodium carbonate tablets are carried out at various *** dissolution process of each tablet is measured by electrical conductivity tracking method and the concentration of dissolved sodium carbonate is quanti fied with calibrated conductivity-concentration converting equation of sodium *** quanti fied dissolution data is fitted with both surface reaction model and diffusion layer model and the results clearly show that surface reaction model is suggested as the appropriate dissolution model for all measured ***,it is determined that carboxymethyl cellulose is a stable element to remain the dissolution mechanism of tablet *** dissolution rate constant quanti fied with surface reaction model presents that carboxymethyl cellulose-sodium carbonate two-component tablets obtain signi ficant higher dissolution rate constant than pure sodium carbonate tablet and higher proportion of carboxymethyl cellulose leads to apparent higher dissolution rate *** results prove for the usage of carboxymethyl cellulose in most practical applications at a relative low-level,the effect of carboxymethyl cellulose is effective and positive for two-component tablet to enhance the dissolution process and improve dissolution rate constant and this effect is speculated coming from its dynamic physical transforming process in water including dilation and conglutination.

关键词： Carboxymethyl cellulose Sodium carbonate Electrical conductivity Temperature Surface reaction model Dissolution rate constant

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An investigation on dissolution kinetics of single sodium carbonate particle with image analysis method

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Chinese Journal of Chemical Engineering 2016年第10期24卷 1487-1496页

作者： changdong li Carlos Amador Yulong Ding Institute of Particle Science and Engineering University of LeedsLeedsUK Procter&Gamble Newcastle-Upon-Tyne Innovation Centre NewcastleUK School of Chemical Engineering University of BirminghamBirminghamUK

Dissolution kinetics of sodium carbonate is investigated with the image analysis method at the approach of single *** dissolution experiments are carried out in an aqueous solution under a series of controlled temperature and p *** selected sodium carbonate particles are all spherical with the same mass and *** dissolution process is quantified with the measurement of particle diameter from dissolution *** concentration of dissolved sodium carbonate in solvent is calculated with the measured diameter of *** surface reaction model and mass transport model are implemented to determine the dissolution mechanism and quantify the dissolution rate constant at each experimental *** to the fitting results with both two models,it is clarified that the dissolution process at the increasing temperature is controlled by the mass transport of dissolved sodium carbonate travelling from particle surface into *** dissolution process at the increasing pH is controlled by the chemical reaction on particle ***,the dissolution rate constant for each single spherical sodium carbonate particle is quantified and the results show that the dissolution rate constant of single spherical sodium carbonate increases significantly with the rising of temperature,but decreases with the increasing of pH conversely.

关键词： Sodium carbonate Single particle Dissolution rate constant Image analysis

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A Predictive,Two-Parameter Model for the Movement of Reservoir Landslides

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Journal of Earth Science 2020年第6期31卷 1051-1057页

作者： Robert E.Criss Wenmin Yao changdong li Huiming Tang Department of Earth and Planetary Sciences Washington UniversitySt.Louis MO 63130USA Faculty of Engineering China University of GeosciencesWuhan 430074China

Monitoring data show that many landslides in the Three Gorges region,China,undergo step-like displacements in response to the managed,quasi-sinusoidal annual variations in reservoir *** behavior is consistent with motion initiating when the reservoir water level falls below a critical level that is intrinsic to each landslide,with the subsequent displacement rate of the landslide being proportional to the water depth below that critical *** motion terminates when the water level rises back above the critical level,so the annual step size is the time integral of the instantaneous displacement *** responses are incorporated into a differential equation that is easily calibrated with monitoring data,allowing prediction of landslide movement from actual or anticipated reservoir level *** successes include(1)initiation and termination of the annual sliding steps at the critical reservoir level,producing a series of steps;(2)prediction of variable step size,year to year;and(3)approximate prediction of the shape and size of each annual *** rainfall correlates poorly with step size,probably because its effect on groundwater levels is dwarfed by the 30 m annual variations in the level of the Three Gorges *** landslide behavior is suggested.

关键词： reservoir landslide parsimonious model step-like displacement displacement prediction critical reservoir level

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Integrating Shipborne Images with Multichannel Deep Learning for Landslide Detection

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Journal of Earth Science 2024年第1期35卷 296-300页

作者： Pengfei Feng changdong li Shuang Zhang Jie Meng Jingjing Long School of Mechanical Engineering and Electronic Information China University of GeosciencesWuhan 430074China Faculty of Engineering China University of GeosciencesWuhan 430074China Department of Civil Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan 430074China College of Geology Engineering and Geomatics Changan UniversityXi'an 710054China Department of Geosciences University of OsloOslo 0316Norway

0 *** disasters in recession zones along riverbanks impose significant global social,economic,and ecological *** areas are particularly susceptible to *** inflict significant harm due to fluctuating water levels(Meng et al.,2023;Dai et al.,2021;li et al.,2021).This,in turn,endangers the safety and accessibility of roads and waterways adjacent to rivers,and hydropower station and reservoir security(Yan et al.,2022;Guo et al.,2020;Tang et al.,2017).

关键词： reservoir Landslide Ship

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Centrifuge modelling of landslides and landslide hazard mitigation:A review

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Geoscience Frontiers 2023年第1期14卷 372-401页

作者： Kun Fang Huiming Tang changdong li Xuexue Su Pengju An Sixuan Sun Faculty of Engineering China University of GeosciencesWuhan 430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan 430074China

Landslides are serious geohazards that occur under a variety of climatic conditions and can cause many casualties and significant economic *** modelling,as a representative type of physical modelling,provides a realistic simulation of the stress level in a small-scale model and has been applied over the last 50 years to develop a better understanding of *** recent developments in this technology,the application of centrifuge modelling in landslide science has significantly ***,we present an overview of physical models that can capture landslide processes during centrifuge *** review focuses on(i)the experimental principles and considerations,(ii)landslide models subjected to various triggering factors,including centrifugal acceleration,rainfall,earthquakes,water level changes,thawing permafrost,excavation,external loading and miscellaneous conditions,and(iii)different methods for mitigating landslides modelled in centrifuge,such as the application of nails,piles,geotextiles,vegetation,*** behaviors of all the centrifuge models are discussed,with emphasis on the deformation and failure mechanisms and experimental *** on this review,we provide a best-practice methodology for preparing a centrifuge landslide test and propose further efforts in terms of the seven aspects of model materials,testing design and equipment,measurement methods,scaling laws,full-scale test applications,landslide early warning,and 3D modelling to better understand the complex behaviour of landslides.

关键词： Centrifuge test Landslide Slope stability Scaling law Mitigation strategy

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Harnessing Distributed Deep Learning for Landslide Displacement Prediction:A Multi-Model Collaborative Approach Amidst Data Silos

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Journal of Earth Science 2024年第5期35卷 1770-1775页

作者： Bingchen li changdong li Yong liu Jie Tan Pengfei Feng Wenmin Yao Faculty of Engineering China University of GeosciencesWuhan 430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan 430074China School of Mechanical Engineering and Electronic Information China University of GeosciencesWuhan 430074China School of Civil Engineering Zhengzhou UniversityZhengzhou 450001China

0 INTRODUCTION Timely and accurate prediction of landslide displacement is crucial for the early warning of landslide disasters(Tang et al.,2019;Zhao et al.,2019;Zhou et al.,2018).Among various landslide displacement prediction models,deep learning(DL)models have gained substantial popularity owing to their simplicity and accuracy(Feng et al.,2024;Dou et al.,2023;Huang et al.,2023,2017;Wang et al.,2022).

关键词： landslide prediction Landslide

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Mechanical Behaviors of Anchorage Interfaces in Layered Rocks with Fractures under Axial Loads

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Journal of Earth Science 2023年第2期34卷 354-368页

作者： Yan Wang changdong li Zhilan Cai Guoqiang Zhu Jiaqing Zhou Wenmin Yao Faculty of Engineering China University of GeosciencesWuhan 430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan 430074China School of Civil Engineering Zhengzhou UniversityZhengzhou 450001China

Rock bolts are widely employed as an effective and efficient reinforcement method in geotechnical *** composite structures formed by hard rock and weak rock are often encountered in practical ***,the spatial structure of the rock mass has a direct influence on the effect of the anchorage *** investigate the impact of rock mass structure on the mechanical characteristics of anchorage interfaces,pull-out tests on reinforced specimens with different mudstone thicknesses and fracture dip angles are *** experimental results indicate that the percentage of mudstone content and fracture dip angle have a significant influence on the pullout load of the samples.A weaker surrounding rock results in a lower peak load and a longer critical anchorage length,and vice *** results also show that 70%mudstone content can be considered a critical condition for impacting the peak ***,the percentage of mudstone content has a limited influence on the variation in the peak load when it exceeds 70%.Optical fiber deformation results show that compared to the rock mass with fracture dip angles of 0°and 60°,the rock mass with a fracture dip angle of 30°has a more uniformly distributed force at the anchorage *** the fracture dip angle exceeds 60°,the dip angle is no longer a key indicator of peak *** accuracy of the experimentally obtained load-displacement curves is further verified although numerical simulation using the discrete element method.

关键词： layered rocks grouted rockbolts grout/rock interface distributed optical fiber mechanical behavior

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Characterization of Macro-and Meso-Scale Shear Behavior of Soil-Brick Mixtures with Different Contents and Shapes of Brick by Discrete Element Method

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Journal of Earth Science 2023年第5期34卷 1641-1644页

作者： Huawei Zhang changdong li Ni Xie Wenmin Yao Yang Ye Nang Mon Mon Thaw Faculty of Engineering China University of GeosciencesWuhan 430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan 430074China School of Civil Engineering Zhengzhou UniversityZhengzhou 450001China Geology Department Taunggyi UniversityTaunggyi 06011Myanmar

Due to urban construction and renovation projects,a large amount of construction and demolition waste(CDW)is increasing year by year in *** them,soil-brick mixture(SBM)is most widely landfilled because many older brick buildings were constructed in the last century(Zhang et al.,2022;Xu et al.,2021).Since the SBM is composed of two kinds of geotechnical materials,its mechanical properties are more complex than those of the single *** depend not only on the mechanical properties of the individual components such as soil and brick,but also on the relative content of these components and the shape of the coarse particles(Zhu et al.,2021).The shear properties of SBM directly affect the stability of slope and paving engineering;therefore,it is significant to study the mechanical properties of SBM.

关键词： material Shear soil

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Rapid Evaluation of Rock Mass Integrity of Engineering Slopes Using Three-Dimensional Laser Scanning

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Journal of Earth Science 2023年第6期34卷 1920-1925页

作者： liang Chen Yunfeng Ge Xuming Zeng Haiyan Wang changdong li Shan Dong Yang Ye Dongming Gu PowerChina Huadong Engineering(Fujian)Co. Ltd.Fuzhou 350003China Faculty of Engineering China University of GeosciencesWuhan 430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan 430074China

0 *** classification of the rock mass quality is an important research topic within geological engineering and rock mechanics,because it is a powerful tool to perform rock mass stability analysis in rock engineering p... 详细信息

关键词： rock Singh Slope

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Upper-Bound limit Analysis of the Multi-Layer Slope Stability and Failure Mode Based on Generalized Horizontal Slice Method

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Journal of Earth Science 2024年第3期35卷 929-940页

作者： Huawei Zhang changdong li Wenqiang Chen Ni Xie Guihua Wang Wenmin Yao Xihui Jiang Jingjing Long Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources Changjiang River Scientific Research InstituteWuhan 430010China Faculty of Engineering China University of GeosciencesWuhan 430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan 430074China School of Civil Engineering Zhengzhou UniversityZhengzhou 450001China

Multi-layer slopes are widely found in clay residue receiving fields.A generalized horizontal slice method(GHSM)for assessing the stability of multi-layer slopes that considers the energy dissipation between adjacent horizontal slices is *** view of the upper-bound limit analysis theory,the energy equation is derived and the ultimate failure mode is generated by comparing the sliding surface passing through the slope toe(mode A)with that below(mode B).In addition,the influence of the number of slices on the stability coefficients in the GHSM is studied and the stable value is *** to the original method(Chen’s method),the GHSM can acquire more precise results,which takes into account the energy dissipation in the inner sliding soil ***,the GHSM,limit equilibrium method(LEM)and numerical simulation method(NSM)are applied to analyze the stability of a multi-layer slope with different slope angles and the results of the safety factor and failure mode are very close in each *** ultimate failure modes are shown to be mode B when the slope angle is not more than 28°.It illustrates that the determination of the ultimate sliding surface requires comparison of multiple failure modes,not only mode A.

关键词： stability and failure mode slope stability generalized horizontal slice method upperbound limit analysis energy dissipation geotechnical engineering.

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