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Modeling the effect of wetting on the mechanical behavior of crushable granular materials

Geoscience Frontiers 2020年第2期11卷 487-494页

作者： carlos Ovalle Pierre-Yves Hicher Research Institute of Mining and Environment(RIME UQAT-Polytechnique) Department of CivilGeological and Mining EngineeringPolytechnique MontrealQuebecCanada GeM UMR CNRS 6183 Ecole Centrale de NantesFrance

It is well known that the compressibility of crushable granular materials increases with the moisture content,due to the decrease of particle strength in a humid *** existing approach to take into account the effect of grain breakage in constitutive modeling consists in linking the evolution of the grain size distribution to the plastic *** how the material humidity can affect this relationship is not clear,and experimental evidence is quite *** on compression tests on dry and saturated crushable sand recently reported by the present authors,a new non-linear relationship is proposed between the amount of particle breakage and the plastic *** expression contains two parameters:(1)a material constant dependent on the grain characteristics and(2)a constant depending on the wetting condition(in this study,dry or saturated).A key finding is that the relationship does not depend on the stress path and,for a given wetting condition,only one set of parameters is necessary to reproduce the results of isotropic,oedometric,and triaxial compression *** relationship has been introduced into an elastoplastic constitutive model based on the critical state concept with a double yield surface for plastic sliding and *** breakage ratio is introduced into the expression of the elastic stiffness,the critical state line and the hardening compression *** stress-strain computations with the model allow the plastic work to be calculated and,therefore,the evolution of particle crushing can be predicted through the proposed non-linear relationship and reintroduced into the constitutive *** predictions of the experimental results in terms of both stress-strain relationships and breakage ratio were obtained.

关键词： Grain crushing Wetting Constitutive modeling

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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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Photovoltaic-based DC microgrid with partial shading and fault tolerance

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Journal of Modern Power Systems and Clean Energy 2019年第2期7卷 340-349页

作者： carlos CORREA-BETANZO Hugo CALLEJA carlos AGUILAR Adolfo R.LOPEZ-NUNEZ Elías RODRIGUEZ Electronics Department National Center for Research and Development of Technology62490 CuernavacaMorelosMexico Electronics Department Technological Institute of Celaya38010 CelayaGuanajuatoMexico

Partial shading is a common problem that affects bus regulation in DC microgrids with several photovoltaic(PV) modules as energy sources, as a result of reduced solar irradiance reaching the *** problem can be mitigated by incorporating batteries, but if they are not included, appropriate control strategies must be used. This paper presents a new approach in a PV-based DC microgrid, which provides a high-quality bus voltage regulation in islanding mode, without being affected by partial shading or problems associated with PV module connection and disconnection. The solution proposed herein ensures a proper voltage regulation without being affected by problems such as failures in PV modules or mismatch between them. Besides, it can help to prevent PV partial shade stress by disconnecting the affected modules. A further advantage of the approach is the flexibility to connect more PV modules. The advantages of this approach were verified in a 200 W prototype.

关键词： Photovoltaic Microgrid Partial shading Fault Control strategy

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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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Output-only identification of the modal and physical properties of structures using free vibration response

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Earthquake Engineering and Engineering Vibration 2016年第3期15卷 575-589页

作者： carlos A.Gaviria Luis A.Montejo Civil Engineering Program Facultad de Estudios a DistanciaUniversidad Militar Nueva GranadaColombia Department of Civil Engineering and Surveying University of Puerto Rico at MayaguezMayaguezPR 00681-9000Puerto Rico) Department of Engineering Science and Materials University of Puerto Rico at MayaguezMayaguezPR 00681-9000Puerto Rico

The viability of a complete structural characterization of civil structures is explored and discussed. In particular, the identification of modal （i.e. natural frequencies, damping ratios and modal shapes） and physical properties （i.e. mass and stiffness） using only the structure＇s free decay response is studied. To accomplish this, modal analysis from flee vibration response only （MAFVRO） and mass modification （MM） methodologies are engaged along with Wavelet based techniques for optimal signal processing and modal reconstruction. The methodologies are evaluated using simulated and experimental data. The simulated data are extracted from a simple elastic model of a 5 story shear building and from a more realistic nonlinear model of a RC frame structure. The experimental data are gathered from shake table test of a 2-story scaled shear building. Guidelines for the reconstruction procedure from the data are proposed as the quality of the identified properties is shown to be governed by adequate selection of the frequency bands and optimal modal shape reconstruction. Moreover, in cases where the structure has undergone damage, the proposed identification scheme can also be applied for preliminary assessment of structural health.

关键词： mass modification method output-only modal analysis time-frequency analysis continuous waveletstransform Hilbert transform damping

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Avian responses to an extreme weather event:The case of the‘Filomena’snowstorm in Madrid(central Spain)

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Avian Research 2024年第2期15卷 180-186页

作者： carlos Lazaro carlos Sanchez-García Fabian Casas E.Jorge Tizado Department of Research Fundacion Artemisan13001 Ciudad RealSpain Department of Zoology Faculty of SciencesUniversity of GranadaGranadaSpain Department of Biodiversity and Environmental Management Universidad de Leon24401 PonferradaSpain

Cold spells and severe weather may have detrimental effects in wild birds,but owing to the stochastic nature of these events,it is not always possible to measure their *** January 2021,a strong snowstorm known as‘Filomena’affected Spain,mainly the region of Madrid(Central Spain),which was fully covered with snow and suffered freezing temperatures for a *** bird surveys conducted in the winter-spring of 2020 and 2021(before and after Filomena)at same locations,we addressed the possible impact of the cold spell in three widespread gamebirds:Wood Pigeon(Columba palumbus),Eurasian Magpie(Pica pica)and Red-legged Partridge(Alectoris rufa).No significant abundance differences were found between years for none of the species and hunting pressure was only significantly reduced for Partridges,hence this species may have been negatively affected by *** suggest that in response to Filomena,Pigeons conducted partial migration in search of better conditions,while Magpies aggregated in certain areas of Madrid and Partridges endured the harsh conditions within their home *** results highlight the importance to alleviate negative impacts of extreme weather events in wild birds through management actions,especially for sedentary species.

关键词： Alectoris rufa Climate change Cold spell Columba palumbus Migration Pica pica Winter

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Thermo-economic analysis of a direct supercritical CO_(2) electric power generation system using geothermal heat

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Frontiers in Energy 2022年第2期16卷 246-262页

作者： Xingchao WANG Chunjian PAN carlos EROMERO Zongliang QIAO Arindam BANERJEE carlos RUBIO-MAYA Lehua PAN Department of Mechanical Engineering Colorado School of MinesGoldenCO 80401USA National Renewable Energy Laboratory(NREL) GoldenCO 80401USA Energy Research Center Lehigh UniversityBethlehemPA 18015USA Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education Southeast UniversityNanjing 210096China Department of Mechanical Engineering and Mechanics Lehigh UniversityBethlehemPA 18015USA Mechanical Engineering Universidad Michoacán de San Nicolas de HidalgoMoreliaMichoacán C.P.58030Mexico Energy Geosciences Division Lawrence Berkeley National LaboratoryUniversity of CaliforniaBerkeleyCA 94720USA

A comprehensive thermo-economic model combining a geothermal heat mining system and a direct supercritical CO_(2) turbine expansion electric power generation system was proposed in this *** by this integrated model,thermo-economic and optimization analyses for the key design parameters of the whole system including the geothermal well pattern and operational conditions were performed to obtain a minimal levelized cost of electricity(LCOE).Specifically,in geothermal heat extraction simulation,an integrated wellbore-reservoir system model(T2Well/ECO_(2)N)was used to generate a database for creating a fast,predictive,and compatible geothermal heat mining model by employing a response surface methodology.A parametric study was conducted to demonstrate the impact of turbine discharge pressure,injection and production well distance,CO_(2) injection flowrate,CO_(2) injection temperature,and monitored production well bottom pressure on LCOE,system thermal efficiency,and capital *** was found that for a 100 MWe power plant,a minimal LCOE of$0.177/kWh was achieved for a 20-year steady operation without considering CO_(2) sequestration *** addition,when CO_(2) sequestration credit is$1.00/t,an LCOE breakeven point compared to a conventional geothermal power plant is achieved and a breakpoint for generating electric power generation at no cost was achieved for a sequestration credit of $2.05/t.

关键词： geothermal heat mining supercritical CO_(2) power generation thermo-economic analysis optimization

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An Intelligent Transportation System Application for Smartphones Based on Vehicle Position Advertising and Route Sharing in Vehicular Ad-Hoc Networks

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Journal of Computer Science & Technology 2018年第2期33卷 249-262页

作者： Seilendria A. Hadiwardoyo Subhadeep Patra carlos T. Calafate Juan-carlos Cano Pietro Manzoni Deptartment of Computer Engineering Universitat Politecnica de Valencia Valencia 46022 Spain

Alerting drivers about incoming emergency vehicles and their routes can greatly improve their travel time in congested cities, while reducing the risk of accidents due to distractions. This paper contributes to this goal by proposing Messiah, an Android application capable of informing regular vehicles about incoming emergency vehicles like ambulances, police cars and fire brigades. This is made possible by creating a network of vehicles capable of directly communicating between them. The user can, therefore, take driving decisions in a timely manner by considering incoming alerts. Using the support of our GRCBox hardware, the application can rely on vehicular ad-hoc network communications in the 5 GHz band, being V2V （vehicle-to-vehicle） communication provided through a combination of Android-based smartphone and our GRCBox device. The application was tested in three different scenarios with different levels of obstruction, showing that it is capable of providing alerts up to 300 meters, and notifying vehicles within less than one second.

关键词： intelligent transportation systems (ITS) vehicular ad-hoc network (VANET) mobile application Android,navigation ad-hoc network

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Theoretical and Experimental Exploration of Organic Synthesis Routes to Obtain Natural Rubber Analogues

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材料科学与工程（中英文A版） 2014年第9期4卷 290-296页

作者： David Ramirez-Sanchez Danilo Gonzalez Pablo ramos Luis-carlos Garcia Centro de Bioinform6tica y Simulacion Molecular Universidad de Talca Talca 346-0000 Chile Departamento de Quimica Universidad Nacional de Colombia Bogota 11001 Colombia Theoretical Chemistry Rutgers University Newark 10032 United States of America Proyecto Curricular Licenciatura en Quimica Universidad Distrital Francisco Jose de Caldas Bogota 11001 Colombia

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Biodegradable Additive for the Construction Industry

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Journal of Renewable Materials 2019年第6期7卷 523-525页

作者： Juan carlos Torres Lozada AIBRIM San SebastiánGuipúzcoa Spain

This paper presents the patent of a new additive for the construction industry,which is obtained from the biomass residues of the wood *** additive is biodegradable and has fluidifying,foaming,plasticizing and stabilizing *** the additive is mixed with cement binder compositions,cement mortar and concrete,lightweight,flame-retardant cellular materials,thermal and acoustic insulators are obtained.

关键词： Wood biomass waste additives construction

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