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Stabilisation of estuarine sediments with an alkali-activated cement for deep soil mixing applications

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Journal of Rock mechanics and Geotechnical Engineering 2024年第4期16卷 1398-1410页

作者： Claver Pinheiro Sara Rios António Viana da fonseca Nuno Cristelo Centre of Physics of minho and Porto Universities (CF-Um-UP) Azurém CampusUniversity of MinhoGuimarães4800-058Portugal CONSTRUCT-GEO Faculty of EngineeringUniversity of PortoRua Dr.Roberto FriasPortos/n 4200-465Portugal CQ-VR School of Science and TechnologyUniversity of Trás-os-Montes e Alto DouroVila Real5000-801Portugal

in this work,an alternative alkali-activated cement(AAC)made of ladle slag precursor mixed with sodium hydroxide and sodium silicate has been developed to enhance the bearing capacity of estuarine soils in coastal conditions via deep soil mixing(DSm).The AAC was optimized to use a low reactivity precursor(ladle slag)and to deal with a contaminated high-water content natural sediment cured under *** material performance was analysed by comparison to a mixture made with Portland cement and cured in the same *** and unconfined compressive strength tests as well as seismic waves measurements after 3-,7-,14-and 28-d curing were performed to obtain a relationship between elastic stiffness and strength with curing time for both ***,the AAC mix demonstrated superior strength results,exhibiting almost double flexural and compressive strengths after 28 d compared to the Portland cement *** AAC mix also showed a higher rate of stiffness increase than the Portland cement mix,which has a higher initial stiffness at young ages but lower stiffness *** analysis confirmed that the proposed AAC could effectively immobilise any contaminants from soil or *** effect of curing under stress was analysed in triaxial compression tests and found to be insignificant,indicating that laboratory data obtained without stress curing can represent the material's behaviour in a DSm column,which will cure under the weight of the column.

关键词： Alkaline-activation Steel slag Submerged curing Seismic wave measurements Leachate analysis Curing under stress

The potential of starch-chitosan blends with poloxamer for the preparation of microparticles by spray-drying

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Particuology 2024年第6期89卷 1-10页

作者： Juan Enrique Barranco-García Carolina Caicedo Enrique Javier Jiménez-Regalado Carlos Espinoza-González Graciela morales Rocio Yaneli Aguirre-Loredo Abril fonseca-García Tecnológico Nacional de méxico/instituto Tecnológico de Oaxaca Departamento de Química y BioquímicaAvenida Ing.Víctor Bravo Ahuja No.125Esquina Calzada Tecnológico68030OaxacaMexico Faculty of Engineering Unidad Central del Valle del Cauca(UCEVA)Carrera 17a 48-144763022TuluáColombia Centro de investigación en Química Aplicada(CiQA) Blvd.Enrique Reyna Hermosillo 14025294SaltilloCoahuilaMexico investigadoras por méxico CONAHCYT-CiQA Av.Insurgentes Sur 1562Col.Crédito Constructor03940Alcaldía Benito JuárezCDMXMexico

Using biopolymers as wall materials in spray drying poses challenges,particularly in attaining flowability and thermal stability among their physicochemical *** paper addresses these challenges by preparing microparticles using a blend of starch–chitosan and a poloxamer,commercially named Pluronic®*** aimed to elucidate the effects of varying poloxamer concentrations on the resulting particles through the spray drying *** with a poloxamer concentration of 3%(w/v)demonstrated a notably higher yield,especially when compared to those with 0%and 1%*** with 3%and 5%(w/v)poloxamer displayed a narrower particle size distribution,with the 3%blend showing a superior yield attributed to arrangements of blend components that improve flowability.X-ray diffraction analysis showcased the characteristic peaks of A-type starch form,with shifts suggesting enhanced interactions between *** with increased poloxamer content showed elevated thermal degradation temperatures,with the 3%blend registering a significant rise,opening avenues for encapsulating heat-sensitive *** study primarily focuses on the preparation and basic characterization of *** underscores the potential of blends with optimal poloxamer concentrations in microencapsulation,emphasizing further research to harness their capabilities thoroughly.

关键词： Biopolymer Starch Chitosan Pluronic®F127 microparticles Spray drying

Novel insights into D-Pinitol based therapies:a link between tau hyperphosphorylation and insulin resistance

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Neural Regeneration Research 2024年第2期19卷 289-295页

作者： Dina medina-Vera Antonio Jesús López-Gambero Juan Antonio Navarro Carlos Sanjuan Elena Baixeras Juan Decara Fernando Rodríguez de fonseca instituto de investigación Biomédica de málaga y Plataforma en Nanomedicina-iBimA Plataforma BiONAND UGC Salud MentalMálagaSpain Facultad de Ciencias Universidad de MálagaMálagaSpain CiBER Enfermedades Cardiovasculares(CiBERCV) Hospital Universitario Virgen de la VictoriaUGC del CorazónMálagaSpain University of Bordeaux INSERMNeurocentre MagendieBordeauxFrance Euronutra S.L.Calle Johannes Kepler MálagaSpain Departamento de Bioquímica y Biología molecular Facultad de MedicinaUniversidad de MálagaMálagaSpain

Alzheimer’s disease is a neurodegenerative disorder characterized by the amyloid accumulation in the brains of patients with Alzheimer’s *** pathogenesis of Alzheimer’s disease is mainly mediated by the phosphorylation and aggregation of tau *** the multiple causes of tau hyperphosphorylation,brain insulin resistance has generated much attention,and inositols as insulin sensitizers,are currently considered candidates for drug *** present narrative review revises the interactions between these three elements:Alzheimer’s disease-tau-inositols,which can eventually identify targets for new disease modifiers capable of bringing hope to the millions of people affected by this devastating disease.

关键词： Alzheimer’s disease cyclin-dependent kinase 5 diabetes D-Pinitol inositols insulin resistance kinases phosphorylation Pi3K/Akt tau

Capturing CO2 Emissions in the George C. Wallace Tunnel: A Case Study

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intelligent Control and Automation 2024年第3期15卷 83-94页

作者： Gabe Canitz Cole Ciesta Klint Green Justin Sanders Jason Valencia Jeremy Willingham Daniel fonseca Department of mechanical Engineering The University of Alabama Tuscaloosa AL USA

This paper describes the design of a ventilation system to be paired with a carbon capture system. The ventilation system utilizes the geometry of the George C. Wallace tunnel, located in the City of mobile, Alabama, USA to capture and redirect emissions to a direct air capture (DAC) device to sequester 25% of the total CO2 mass generated from inside the tunnel. The total CO2 mass rate for the westbound traffic between the week-day hours of 7 a.m. and 6 p.m. has been estimated between 2,300 to 3,000 lbs./hr. By sequestering these emissions, the overall surrounding air quality was shown to be improved to a level that mirrors that from the pre-US industrial era of 270 ppm.

关键词： CO2 Capture Tunnel Ventilation Air Flow Analysis Jet Fan Sizing

massive fibrous epulis——a case report of a 10-year-old lesion

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international Journal of Oral Science 2014年第3期6卷 182-184页

作者： Gabriel m fonseca Ricardo m fonseca mario Cantín Department of Oral Pathology Faculty of Dentistry National University of Cordoba Doctoral Program in morphological Sciences Faculty of DentistryUniversidad La Frontera Center for Research in Biomedical Sciences Universidad Autonoma de Chile

The fibrous epulis, a common tumor-like lesion of the gingiva, appears in the interdental papilla as a result of local irritation. Lesions are asymptomatic and have a variable growth rate. A 75-year-old woman was referred for the evaluation of a large painless gingival mass. it had started 10 years back and has been increasing in size the last year. No bone involvement was noted. The tumor was totally removed by excision with surgical scalpel under local anesthesia without teeth extraction. The microscopic findings were suggestive of a fibrous epulis. Differential diagnosis, clinical considerations and factors to prevent recurrence are discussed.

关键词： diagnosis gingival diseases oral pathology

A Hybrid Statistical-Dynamical Downscaling of Air Temperature over Scandinavia Using the WRF model

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Advances in Atmospheric Sciences 2020年第1期37卷 57-74页

作者： Jianfeng WANG Ricardo m.fonseca Kendall RUTLEDGE Javier mARTÍN-TORRES Jun YU Department of mathematics and mathematical Statistics UmeåUniversitySE 90187UmeåSweden Group of Atmospheric Science Division of Space TechnologyDepartment of Computer ScienceElectrical and Space EngineeringLuleåUniversity of TechnologySE 97187 LuleåSweden Novia University of Applied Sciences PO BOX 6FI-65201 VaasaFinland instituto Andaluz de Ciencias de la Tierra 18100 GranadaSpain The Pheasant memorial Laboratory for Geochemistry and Cosmochemistry Institute for Planetary MaterialsOkayama University at MisasaTottori 682-0193Japan

An accurate simulation of air temperature at local scales is crucial for the vast majority of weather and climate *** this work,a hybrid statistical–dynamical downscaling method and a high-resolution dynamical-only downscaling method are applied to daily mean,minimum and maximum air temperatures to investigate the quality of localscale estimates produced by *** two downscaling approaches are evaluated using station observation data obtained from the Finnish meteorological institute over a near-coastal region of western *** dynamical downscaling is performed with the Weather Research and Forecasting(WRF)model,and the statistical downscaling method implemented is the Cumulative Distribution Function-transform(CDF-t).The CDF-t is trained using 20 years of WRF-downscaled Climate Forecast System Reanalysis data over the region at a 3-km spatial resolution for the central month of each *** performance of the two methods is assessed qualitatively,by inspection of quantile-quantile plots,and quantitatively,through the Cramer-von mises,mean absolute error,and root-mean-square error *** hybrid approach is found to provide significantly more skillful forecasts of the observed daily mean and maximum air temperatures than those of the dynamical-only downscaling(for all seasons).The hybrid method proves to be less computationally expensive,and also to give more skillful temperature forecasts(at least for the Finnish near-coastal region).

关键词： WRF air temperature Cumulative Distribution Function-transform hybrid statistical–dynamical downscaling,model evaluation Scandinavian Peninsula

mechanical stimulation devices formechanobiology studies:a market,literature,and patents review

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Bio-Design and manufacturing 2023年第3期6卷 340-371页

作者： F.melo-fonseca O.Carvalho m.Gasik G.miranda F.S.Silva Center for microElectromechanical Systems University of Minho(CMEMS-UMinho)Campus de Azurém4800-058 GuimarãesPortugal LABBELS–Associate Laboratory BragaGuimarãesPortugal international iberian Nanotechnology Laboratory(iNL) 4715-330 BragaPortugal School of Chemical Engineering Aalto University Foundation00076 EspooFinland Seqvera Ltd. HelsinkiFinland Department of materials and Ceramic Engineering CICECOAveiro Institute of MaterialsUniversity of Aveiro3810-193 AveiroPortugal

Significant advancements in various research and technological fields have contributed to remarkable findings on the physiological dynamics of the human *** closely mimic the complex physiological environment,research has moved from two-dimensional(2D)culture systems to more sophisticated three-dimensional(3D)dynamic *** bioreactors or microfluidic-based culture models,cells are typically seeded on polymeric substrates or incorporated into 3D constructs which are mechanically stimulated to investigate cell response to mechanical stresses,such as tensile or *** review focuses on the working principles of mechanical stimulation devices currently available on the market or custom-built by research groups or protected by patents and highlights the main features still open to *** are the features which could be focused on to perform,in the future,more reliable and accurate mechanobiology studies.

关键词： Biomaterials Polymers Actuators mechanical stress mechanotransduction

Direct oxidation of methane at low temperature using Pt/C,Pd/C,Pt/C-ATO and Pd/C-ATO electrocatalysts prepared by sodium borohydride reduction process

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燃料化学学报 2018年第9期46卷 1137-1145页

作者： J.Nandenha E.H.Fontes R.m.Piasentin F.C.fonseca A.O.Neto instituto de Pesquisas Energéticas e Nucleares IPEN/CNEN-SPAv.Prof.Lineu Prestes2242 Cidade UniversitáriaCEP 05508-000Sao PauloSPBrazil

The main objective of this paper was to characterize the voltammetric profiles of the Pt/C,Pt/C-ATO,Pd/C and Pd/CATO electrocatalysts and study their catalytic activities for methane oxidation in an acidic electrolyte at 25 ℃ and in a direct methane proton exchange membrane fuel cell at 80 ℃. The electrocatalysts prepared also were characterized by X-ray diffraction( XRD) and transmission electron microscopy( TEm). The diffractograms of the Pt/C and Pt/C-ATO electrocatalysts show four peaks associated with Pt face-centered cubic( fcc) structure,and the diffractograms of Pd/C and Pd/C-ATO show four peaks associated with Pd face-centered cubic( fcc) structure. For Pt/C-ATO and Pd/C-ATO,characteristic peaks of cassiterite( SnO_2) phase are observed,which are associated with Sb-doped SnO_2( ATO) used as supports for electrocatalysts. Cyclic voltammograms( CV) of all electrocatalysts after adsorption of methane show that there is a current increase during the anodic scan. However,this effect is more pronounced for Pt/C-ATO and Pd/C-ATO. This process is related to the oxidation of the adsorbed species through the bifunctional mechanism,where ATO provides oxygenated species for the oxidation of CO or HCO intermediates adsorbed in Pt or Pd sites. From in situ ATR-FTiR( Attenuated Total Reflectance-Fourier Transform infrared) experiments for all electrocatalysts prepared the formation of HCO or CO intermediates are observed,which indicates the production of carbon dioxide. Polarization curves at 80 ℃in a direct methane fuel cell( DmEFC) show that Pd/C and Pt/C electroacatalysts have superior performance to Pd/C-ATO and Pt/C-ATO in methane oxidation.

关键词： sodium borohydride reduction process Pt/C-ATO and Pd/C-ATO electrocatalysts methane oxidation acidic electrolytes polarization curves

Photoluminescent Tb^(3+)-based metal-organic framework as a sensor for detection of methanol in ethanol fuel

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Journal of Rare Earths 2019年第3期37卷 225-231页

作者： Ramon R.F.fonseca Rafael D.L.Gaspar ivo m.Raimundo Jr. Priscilla P.Luz Department of Chemistry Federal University of Espírito Santo institute of Chemistry University of Campinas

The sensing capability of a Tb^(3+)-metal-organic framework, based on its photoluminescence, was used for detection of methanol in ethanol fuel. it was synthesized using terbium and trimesic acid as a metal ion center and ligand, respectively. Powder X-ray diffraction, infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy were employed to characterize the synthesized mOF-76 structural features. According to the results, mOF-76 was successfully obtained with minor synthetic modification and its activated form(named TbTmA) was tested as a sensor for methanol. Tb^(3+) luminescence intensity increases as the methanol concentration in ethanol fuel also increases and the water content does not affect this response. Our findings indicate TbTmA as an appropriate sensor for evaluating ethanol fuel adulteration by methanol addition above the allowed limit.

关键词： Lanthanide metal-organic frameworks Luminescence Ethanol fuel Sensor Adulteration