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multi-scale analysis of carbon mineralization in lime-treated soils considering soil mineralogy

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Journal of Rock mechanics and geotechnical Engineering 2024年第6期16卷 2296-2309页

作者： Dhanalakshmi Padmaraj Chinchu Cherian Dali naidu Arnepalli Department of Civil Engineering Indian Institute of Technology MadrasChennai600036India University of Northern British Columbia Prince GeorgeBCV2N4Z9Canada

mineral carbonation is emerging as a reliable CO_(2) capture technology that can mitigate climate *** lime-treated clayey soils,mineral carbonation occurs through the carbonation of free lime and cementitious products derived from pozzolanic *** kinetics of the reactions in lime-treated clayey soils are variable and depend primarily on soil *** present study demonstrates the role of soil mineralogy in CO_(2) capture and the subsequent changes caused by carbon mineralization in terms of the unconfined compressive strength(UCS)of lime-treated soils during their service *** clayey soils(kaolin,bentonite,and silty clay)with different mineralogical characteristics were treated with 4%lime content,and the samples were cured in a controlled environment for 7 d,90 d,180 d,and 365 *** the specified curing periods,the samples were exposed to CO_(2) in a carbonation cell for 7 *** non-carbonated samples purged with N2 gas were used as a benchmark to compare the mechanical,chemical-mineralogical,and microstructure changes caused by carbonation *** investigations indicated that exposure to CO_(2) resulted in an average increase of 10%in the UCS of limetreated bentonite,whereas the strength of lime-treated kaolin and silty clay was reduced by an average of 35%.The chemical and microstructural analyses revealed that the precipitated carbonates effectively filled the macropores of the treated bentonite,compared to the inadequate cementation caused by pozzolanic reactions,resulting in strength *** contrast,strength loss in lime-treated kaolin and silty clay was attributed to the carbonation of cementitious phases and partly to the tensile stress induced by carbonate *** terms of carbon mineralization prospects,lime-treated kaolin exhibited maximum carbonation due to the higher availability of unreacted *** results suggest that,in addition to the increase in compressive strength,adequate calcium-b

关键词： Clays mineralogy Carbon capture Lime Strength Pore structure

Coupled bio-chemo-hydro-mechanical modeling of microbially induced calcite precipitation process considering biomass encapsulation using a micro-scale relationship

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Journal of Rock mechanics and geotechnical Engineering 2024年第7期16卷 2775-2789页

作者： Pavan Kumar Bhukya Nandini Adla Dali naidu Arnepalli Department of Civil Engineering Indian Institute of Technology MadrasChennai600036Tamil NaduIndia

geomaterials with inferior hydraulic and strength characteristics often need improvement to enhance their engineering *** ground improvement techniques require enormous mechanical effort or synthetic *** stabilization technique such as microbially induced calcite precipitation(mICP)utilizes bacterial metabolic processes to precipitate cementitious calcium *** reactive transport of biochemical species in the soil mass initiates the precipitation of biocement during the mICP *** precipitated biocement alters the hydro-mechanical performance of the soil ***,the flow,deformation,and transport phenomena regulate the biocementation technique via coupled bio-chemo-hydro-mechanical(BCHm)*** all,one crucial phenomenon controlling the precipitation mechanism is the encapsulation of biomass by calcium *** encapsulation can potentially reduce the biochemical reaction rate and decelerate *** examination of the encapsulation process demands a thorough analysis of associated coupled *** this,a numerical model can assist in capturing the coupled processes influencing encapsulation during the mICP ***,most numerical models did not consider biochemical reaction rate kinetics accounting for the influence of bacterial *** this,the current study developed a coupled BCHm model to evaluate the effect of encapsulation on the precipitated calcite content using a micro-scale semiempirical ***,the developed BCHm model was verified and validated using numerical and experimental observations of soil column ***,the encapsulation phenomenon was investigated in the soil columns of variable maximum calcite crystal *** results depict altered reaction rates due to the encapsulation phenomenon and an observable change in the precipitated calcite content for each maximum crystal ***,the permeability and defor

关键词： Biocementation process Bio-chemo-hydro-mechanical(BCHm) model Reactive transport Encapsulation micro-scale

magnesium oxide(mgO)nanoadsorbents in wastewater treatment:A comprehensive review

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Journal of magnesium and Alloys 2024年第5期12卷 1709-1773页

作者： H.C.S.Perera v.gurunanthanan Anoop Singh m.m.m.g.P.g.mantilaka g.Das Sandeep Arya Department of Physics Khalifa UniversityAbu Dhabi12788United Arab Emirates Postgraduate Institute of Science University of PeradeniyaPeradeniyaSri Lanka Department of Humanities and Sciences Guru Nanak Institutions Technical CampusIbrahimpatnamHyderabad501506India Centre for global Health Research Saveetha Medical College and HospitalsSaveetha Institute of Medical and Technical SciencesChennai602105Tamil NaduIndia Department of Physics University of JammuJammu and Kashmir180006India

Wastewater contamination by heavy metals and synthetic dyes presents a significant environmental challenge,necessitating effective and sustainable separation *** review article provides a detailed examination of magnesium oxide(mgO)nanoparticles as an innovative nanoadsorbent for wastewater treatment,with a specific focus on heavy metal and dye *** review comprehensively explores various aspects of mgO nanoparticles,including their structural characteristics and synthesis *** article delves into the morphology and crystallographic arrangement of mgO nanoparticles,offering insights into their structural *** the complexity of adsorption processes,the review identifies and analyzes parameters influencing the adsorption efficiency of mgO nanoparticles,such as temperature,pH,contact time,initial concentration,and co-existing *** interplay between these parameters and the adsorption capability of mgO nanoparticles emphasizes the importance of optimizing operational ***,the review assesses various synthesis methods for mgO nanoparticles,including sol-gel,hydrothermal,precipitation,green synthesis,solvothermal,and template-assisted *** discusses the advantages,limitations,and resulting nanoparticle characteristics of each method,enabling readers to grasp the implications of synthesis processes on adsorption *** comprehensive review consolidates current insights into the effectiveness of mgO nanoparticles as a potent nanoadsorbent for removing heavy metals and dyes from wastewater covering a wide spectrum of aspects related to mgO ***,there is a need to investigate the use of mgO in the treatment of actual wastewater or river water,in order to leverage its cost-effectiveness and high efficiency for practical water treatment applications in real-time.

关键词： mgO nanoparticles Nanoadsorbent Wastewater treatment Heavy metals Dye separation Adsorption Synthesis methods

Coupled multiphysical model for investigation of influence factors in the application of microbially induced calcite precipitation

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Journal of Rock mechanics and geotechnical Engineering 2024年第6期16卷 2232-2249页

作者： Xuerui Wang Pavan Kumar Bhukya Dali naidu Arnepalli Shuang Chen gesellschaft für Anlagen-und Reaktorsicherheit(gRS)ggmbH Braunschweig38122Germany Department of Civil Engineering Indian Institute of Technology MadrasChennai600036India Federal Institute for geosciences and Natural Resources(BgR) Hannover30655Germany

The study presents a comprehensive coupled thermo-bio-chemo-hydraulic(T-BCH)modeling framework for stabilizing soils using microbially induced calcite precipitation(mICP).The numerical model considers relevant multiphysics involved in mICP,such as bacterial ureolytic activities,biochemical reactions,multiphase and multicomponent transport,and alteration of the porosity and *** model incorporates multiphysical coupling effects through well-established constitutive relations that connect parameters and variables from different physical *** was implemented in the open-source finite element code OpengeoSys(OgS),and a semi-staggered solution strategy was designed to solve the couplings,allowing for flexible model ***,the developed model can be easily adapted to simulate mICP applications in different *** numerical model was employed to analyze the effect of various factors,including temperature,injection strategies,and application ***,a TBCH modeling study was conducted on the laboratory-scale domain to analyze the effects of temperature on urease activity and precipitated calcium *** understand the scale dependency of mICP treatment,a large-scale heterogeneous domain was subjected to variable biochemical injection *** simulations conducted at the field-scale guided the selection of an injection strategy to achieve the desired type and amount of ***,the study emphasized the potential of numerical models as reliable tools for optimizing future developments in field-scale mICP *** present study demonstrates the potential of this numerical framework for designing and optimizing the mICP applications in laboratory-,prototype-,and field-scale scenarios.

关键词： multiphysics microbially induced calcite precipitation(mICP) Coupled thermo-bio-chemo-hydraulic(TBCH) model OpengeoSys(OgS) Influence factors

Atypical presentation of a posterior fossa tumour:A case report

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World Journal of Clinical Cases 2024年第13期12卷 2281-2285页

作者： Alisha Narotam mikara Archary Poobalan Naidoo Yeshkhir Naidoo vanesha naidu Department of Internal medicine King Edward VIII Hospital-University of Kwazulu-NatalDurban 4001Kwa-Zulu NatalSouth Africa Department of Internal medicine Nelson R MandelaSchool of MedicineUniversity of Kwa-Zulu NatalDurban 4001Kwa-Zulu NatalSouth Africa Department of Radiology King Edward VIII Hospital-University of Kwazulu-NatalDurban 4001Kwazulu-NatalSouth Africa

BACKgROUND We described a case of a patient with a meningioma in the posterior fossa presenting atypically with an isolated unilateral vocal cord palsy causing severe respiratory *** is of interest as the patient had no other symptomatology,especially given the size of the mass,which would typically cause a pressure effect leading to neurological and auditory *** SUmmARY This case report described a 48-year-old male who was married with two children and employed as a car *** had a medical history of asthma for the past 10 years controlled with an as-needed beta 2 agonist metered dose *** initially presented to our facility with severe respiratory *** reported a 1-wk history of shortness of breath and wheezing that was not relieved by his *** had no constitutional symptoms or impairment of *** clinical examination,the patient’s chest was“silent.”Our initial assessment was status asthmaticus with type 2 respiratory failure,based on the history of asthma,a“silent chest,”and the arterial blood gas *** A posterior fossa meningioma of such a large size and with extensive infiltration rarely presents with an isolated unilateral vocal cord *** patient’s chief presenting feature was severe respiratory distress,which combined with his background medical history of asthma,was *** should thus consider meningioma as a differential diagnosis for a unilateral vocal cord palsy even without audiology involvement.

关键词： Respiratory distress meningioma Unilateral vocal cord palsy Posterior fossa tumour Neurosurgery Neurology Radiology Case report

Bio-Inspired Intelligent Routing in WSN: Integrating mayfly Optimization and Enhanced Ant Colony Optimization for Energy-Efficient Cluster Formation and maintenance

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Computer modeling in Engineering & Sciences 2024年第10期141卷 127-150页

作者： v.g.Saranya S.Karthik Department of Electronics and Communication Engineering Faculty of Engineering&TechnologySRM Institute of Science and TechnologyVadapalani CampusChennai600026India

Wireless Sensor Networks(WSNs)are a collection of sensor nodes distributed in space and connected through wireless *** sensor nodes gather and store data about the real world around ***,the nodes that are dependent on batteries will ultimately suffer an energy loss with time,which affects the lifetime of the *** research proposes to achieve its primary goal by reducing energy consumption and increasing the network’s lifetime and *** present technique employs the hybrid mayfly Optimization Algorithm-Enhanced Ant Colony Optimization(mFOA-EACO),where the mayfly Optimization Algorithm(mFOA)is used to select the best cluster head(CH)from a set of nodes,and the Enhanced Ant Colony Optimization(EACO)technique is used to determine an optimal route between the cluster head and base *** performance evaluation of our suggested hybrid approach is based on many parameters,including the number of active and dead nodes,node degree,distance,and energy *** objective is to integrate mFOA-EACO to enhance energy efficiency and extend the network life of the WSN in the *** proposed method outcomes proved to be better than traditional approaches such as Hybrid Squirrel-Flying Fox Optimization Algorithm(HSFLBOA),Hybrid Social Reindeer Optimization and Differential Evolution-Firefly Algorithm(HSRODE-FFA),Social Spider Distance Sensitive-Iterative Antlion Butterfly Cockroach Algorithm(SADSS-IABCA),and Energy Efficient Clustering Hierarchy Strategy-Improved Social Spider Algorithm Differential Evolution(EECHS-ISSADE).

关键词： Enhanced ant colony optimization mayfly optimization algorithm wireless sensor networks cluster head base station(BS)

Crosstalk between degradation and bioenergetics: how autophagy and endolysosomal processes regulate energy production

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Neural Regeneration Research 2025年第3期20卷 671-681页

作者： Angelid Pabon Jagannatham naidu Bhupana Ching-On Wong Department of Biological Sciences Rutgers UniversityNewarkNJUSA

Cells undergo metabolic reprogramming to adapt to changes in nutrient availability, cellular activity, and transitions in cell states. The balance between glycolysis and mitochondrial respiration is crucial for energy production, and metabolic reprogramming stipulates a shift in such balance to optimize both bioenergetic efficiency and anabolic requirements. Failure in switching bioenergetic dependence can lead to maladaptation and pathogenesis. While cellular degradation is known to recycle precursor molecules for anabolism, its potential role in regulating energy production remains less explored. The bioenergetic switch between glycolysis and mitochondrial respiration involves transcription factors and organelle homeostasis, which are both regulated by the cellular degradation pathways. A growing body of studies has demonstrated that both stem cells and differentiated cells exhibit bioenergetic switch upon perturbations of autophagic activity or endolysosomal processes. Here, we highlighted the current understanding of the interplay between degradation processes, specifically autophagy and endolysosomes, transcription factors, endolysosomal signaling, and mitochondrial homeostasis in shaping cellular bioenergetics. This review aims to summarize the relationship between degradation processes and bioenergetics, providing a foundation for future research to unveil deeper mechanistic insights into bioenergetic regulation.

关键词： autophagy bioenergetics endolysosome energy production glycolysis metabolic reprogramming mitochondria

Control system design for a pressure-tube-type supercritical water-cooled nuclear reactor via a higher order sliding mode method

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Nuclear Science and Techniques 2024年第1期35卷 145-154页

作者： m.Hajipour g.R.Ansarifar Department of Nuclear Engineering Faculty of PhysicsUniversity of IsfahanIsfahan 81746-73441Iran

Nuclear power plants exhibit non-linear and time-variable ***,designing a control system that sets the reactor power and forces it to follow the desired load is complicated.A supercritical water reactor(SCWR)is a fourth-generation conceptual *** an SCWR,the non-linear dynamics of the reactor require a controller capable of control-ling the *** this study,a pressure-tube-type SCWR was controlled during reactor power maneuvering with a higher order sliding mode,and the reactor outgoing steam temperature and pressure were controlled *** an SCWR,the temperature,pressure,and power must be maintained at a setpoint(desired value)during power *** point kinetics equations with three groups of delayed neutrons were used in the ***-order and classic sliding mode controllers were separately manufactured to control the plant and were compared with the PI controllers speci-fied in previous *** controlled parameters were reactor power,steam temperature,and ***,for these parameters,the PI controller had certain instabilities in the presence of *** classic sliding mode controller had a higher accuracy and stability;however its main drawback was the chattering *** was highly accurate and stable and had a small computational *** reality,it followed the desired values without oscillations and chattering.

关键词： Supercritical water nuclear reactor Higher order sliding mode controller Steam temperature Steam pressure Point kinetics model

Use of an immunocapture device to detect cytokine release in discrete brain regions

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Neural Regeneration Research 2024年第4期19卷 703-704页

作者： matthew g.Frank michael v.Baratta Department of Integrative Physiology University of Colorado BoulderBoulderCOUSA(Frank MG)Department of Psychology and NeuroscienceUniversity of Colorado BoulderBoulderCOUSA(Baratta MV)

Production of proinflammatory cytokines in the central nervous system is a key process in the neuroinflammatory response to trauma,infection,and neurodegenerative diseases(Kumar,2019).These intercellular signaling molecules play multiple roles in the immune response in the central nervous system including the orchestration of the sickness response to innate immune perturbations in the brain(Dantzer et al.,2008).

关键词： system release innate