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experimental study on influence of blade angle and particle size on particle mechanics on a batch-operated single floor of a multiple hearth furnace

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Particuology 2024年第2期85卷 224-240页

作者： max Kriegeskorte Nikoline Hilse Phil Spatz Viktor Scherer Institute for energy Plant Technology(LeAT) Ruhr University BochumUniversitätsstraβe 15044780 BochumGermany

In industry,multiple hearth furnaces are used for the thermal treatment of particulate *** current contribution concentrates on the experimental analysis of particle mechanics for a batch-operated single floor of a multiple hearth *** particles are agitated on the circular floor by a single,rotating rabble arm equipped with three flat rabble blades of 10 mm *** blade angle,defined as the angle,which the blade is inclined against the tangential direction,is varied from 0°to 90°.A single layer of spherical polyoxymethylene(POM)particles with three different diameters(5,10 and 20 mm)is placed on the *** analyze the results,two parameters have been extracted from image analysis when the bed of particles is agitated,first,the area not covered by particles and second,the frequency distribution of the mean distance among the *** particle free surface area increases with the inclination of the *** evolution of the particle free surface area differs for the different particle *** general,the maximum particle free area for all blade angles is the largest for the 5 mm particles followed by the 20 mm *** the 10 mm particles,the particle free surface area starts for a blade angle of 0°at larger values than for the 20 mm particles but the values fall below the values for the 20 mm particles for larger blade *** reason for this behavior is discussed in *** mean distance among the particles is a parameter characterizing the length scales dominating the effects on the *** frequency distribution of the mean distance among particles provides infor-mation about the morphology of the particle bulk,for example,whether the free surface area is inter-spersed with particles.

关键词： Hearth furnace floor Particle movement Spherical particles Particle free surface area Mean distance among particles

experimental investigation of stress unloading effects on rock damage and confining pressure-dependent crack initiation stress of porous sandstone under true triaxial stress environments

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Rock Mechanics Bulletin

rock Mechanics Bulletin 2024年第2期3卷 78-86页

作者： Qingsheng Bai max Friedel Heinz Konietzky Geotechnical Institute TU Bergakademie FreibergGustav-Zeuner-Straße 109599 FreibergGermany

This study investigates the impact of intermediate(σ_(2))and minimum(σ_(3))principal stress unloading on damage behavior and the confining pressure influence on crack initiation stress(σci)in true triaxial stress conditions,utilizing large-scale cubic *** distinct true triaxial tests were executed,examining the effects of confining stress(σ_(2)andσ_(3))unloading on porous sandstone damage and the correlation between confining stress andσ*** emission(Ae)parameters,signal characteristics,and wave velocity variations were utilized to elucidate cracking mechanisms and damage development in the *** tests reveal consistent ve-locities in three orthogonal directions(V_(11),V_(22),and V_(33))during the initial two unloading *** the subse-quent three stages,confining stress unloading leads to a decrease in wave velocity in the corresponding direction,while velocities in the other two directions remain nearly ***,σ_(2)unloading generates higher amplitude Ae signals compared toσ_(3)unloading,with over 70%of the micro-cracks categorized as *** the incremental loading tests,σ_(ci) is found to be contingent on confining pressure,withσ_(2)playing a crucial ***σ_(1) loading,V_(33) decreases,indicating additional crack formation;conversely,σ_(3)loading results in V33 increase,signifying the continuous closure of existing *** of the experiments are summarized and prospects in this domain are outlined.

关键词： Stress unloading Damage behavior True triaxial stress environments Wave velocity Crack initiation stress

A study on wildfire impacts on greenhouse gas emissions and regional air quality in South of Orléans,France

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Journal of environmental Sciences 2024年第1期135卷 521-533页

作者： Chaoyang Xue Gisèle Krysztofiak Yangang ren Min Cai Patrick Mercier Frédéric Le Fur Corinne robin Benoit Grosselin Véronique Daele max rMcGillen Yujing Mu Valéry Catoire Abdelwahid Mellouki Laboratoire de Physique et Chimie de l’environnement et de l’espace(LPC2e) CNRS–UniversitéOrléans–CNES(UMR 7328)Orléans Cedex 245071France Institut de Combustion AérothermiqueRéactivitéEnvironnement(ICARE)CNRSOrléans Cedex 245071France research Centre for eco-environmental Sciences Chinese Academy of SciencesBeijing 100085China Lig’Air-Association de surveillance de la qualitéde l’air en région Centre-Val de Loire Saint-Cyr-en-Val 45590France Mohammed V University RabatMorocco

Wildfire events are increasing globally which may be partly associated with climate change,resulting in significant adverse impacts on local,regional air quality and global *** September 2020,a small wildfire(burned area:36.3 ha)event occurred in Souesmes(Loiret-Cher,Sologne,France),and its plume spread out over 200 km on the following day as observed by the MODIS *** on measurements at a suburban site(~50 km northwest of the fire location)in Orléans and backward trajectory analysis,young wildfire plumes were *** increases in gaseous pollutants(CO,CH_(4),N_(2)O,VOCs,etc.)and particles(including black carbon)were found within the wildfire plumes,leading to a reduced air *** factors,defined as eF(X)=ΔX/ΔCO(where,X represents the target species),of various trace gases and black carbon within the young wildfire plumes were determined accordingly and compared with previous *** in the ambient ions(such as ammonium,sulfate,nitrate,chloride,and nitrite in the particle-and gasphase)and aerosol properties(e.g.,aerosol water content,aerosol p H)were also quantified and ***,we estimated the total carbon and climate-related species(e.g.,CO_(2),CH_(4),N_(2)O,and BC)emissions and compared them with fire emission *** biomass burning emission inventories have uncertainties in estimating small fire burned areas and *** instance,we found that the Global Fire Assimilation System(GFAS)may underestimate emissions(e.g.,CO)of this small wildfire while other inventories(GFeD and FINN)showed significant *** that it is the first time to record wildfire plumes in this region,related atmospheric implications are presented and discussed.

关键词： Wildfire Air quality emission factor emission inventory VOLTAIre supersite

A randomized controlled trial of Promoting Physical Activity in regional and remote Cancer Survivors(PPArCS)

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Journal of Sport and Health Science 2024年第1期13卷 81-89页

作者： Sarah J.Hardcastle Chloe maxwell-Smith Vinicius Cavalheri Terry Boyle Marta Leyton román Cameron Platell Michael Levitt Christobel Saunders Frank Sardelic Sophie Nightingale Jacob McCormick Craig Lynch Paul A.Cohen max Bulsara Dana Hince Sport and Physical Activity research Centre Sheffield Hallam UniversitySheffieldS102BPUK Institute for Health research The University of Notre DameFremantleWA 6959Australia Curtin School of Population Health Curtin UniversityPerthWA 6845Australia Curtin School of Allied Health Curtin UniversityPerthWA 6845Australia Allied Health South Metropolitan Health ServiceMurdochWA 6150Australia Australian Centre for Precision Health University of South AustraliaAdelaideSA 5001Australia Department of Didactics of Musical Plastic and Body ExpressionUniversity of ExtremaduraCaceres 10071Spain St.John of God Subiaco Hospital PerthWA 6008Australia Department of Surgery University of MelbourneMelbourneVIC 3010Australia Tamara Private Hospital TamworthNSW 2340Australia Peter MacCallum Cancer Centre MelbourneVIC 3000Australia College of Health and Medicine Australian National UniversityCanberraACT 2600Australia Division of Obstetrics and Gynaecology Medical SchoolUniversity of Western AustraliaPerthWA 6009Australia

Background:Physical activity(PA)is important for cancer *** of remotely delivered interventions are needed to assist in reaching under-served non-metropolitan cancer *** objective of this study was to ascertain whether wearable technology,coupled with health coaching was effective in increasing PA in breast and colorectal cancer survivors living in regional and remote areas in ***:Cancer survivors from 5 states were randomized to intervention and control *** participants were given a Fitbit Charge 2TMand received up to 6 telephone health coaching *** participants received PA print *** assessments at baseline and 12 weeks measured moderate-to-vigorous PA(MVPA),light PA,and sedentary ***:eighty-seven participants were recruited(age=63±11 years;74(85%)female).There was a significant net improvement in MVPA of 49.8 min/week,favoring the intervention group(95%confidence interval(95%CI):13.6-86.1,p=0.007).There was also a net increase in MVPA bouts of 39.5 min/week(95%CI:11.9-67.1,p=0.005),favoring the intervention *** groups improved light PA and sedentary behavior,but there were no between-group ***:This’s the first study to demonstrate that,when compared to standard practice(i.e.,PA education),a wearable technology intervention coupled with distance-based health coaching,improves MVPA in non-metropolitan cancer *** results display promise for the use of scalable interventions using smart wearable technology in conjunction with phone-based health coaching to foster increased PA in geographically disadvantaged cancer survivors.

关键词： Behavior change exercise Health disparities Oncology Wearable technology

Circulating microrNA expression and nonalcoholic fatty liver disease in adolescents with severe obesity

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World Journal of Gastroenterology 2024年第4期30卷 332-345页

作者： Yi-Jie Li Brittney O Baumert Nikos Stratakis Jesse A Goodrich Hao-Tian Wu Jing-Xuan He Yin-Qi Zhao max T Aung Hong-Xu Wang Sandrah P eckel Douglas I Walker Damaskini Valvi Michele A La Merrill Justin r ryder Thomas H Inge Todd Jenkins Stephanie Sisley rohit Kohli Stavra A Xanthakos Andrea A Baccarelli rob McConnell David V Conti Lida Chatzi Department of Population and Public Health Sciences Keck School of MedicineUniversity of Southern CaliforniaLos AngelesCA 90032United States Barcelona Institute of Global Health Barcelona Institute of Global HealthBarcelona 08036Spain Department of environmental Health Sciences Mailman School of Public HealthColumbia UniversityNew YorkNY 10032United States Gangarosa Department of environmental Health Rollins School of Public HealthEmory UniversityAtlantaGA 30329United States Department of environmental Medicine and Public Health Icahn School of Medicine at Mount SinaiNew YorkNY 10029United States Department of environmental Toxicology University of CaliforniaDavisCA 95616United States Department of Surgery Lurie Children’s Hospital of ChicagoChicagoIL 60611United States Northwestern University Feinberg School of Medicine Northwestern UniversityChicagoIL 60611United States Division of Biostatistics and epidemiology Cincinnati Children's Hospital Medical CenterCincinnatiOH 45229United States Department of Pediatrics University of Cincinnati College of MedicineCincinnatiOH 45229United States Department of Pediatrics Children’s Nutrition Research Center USDA/ARSBaylor College of MedicineHoustonTX 77030United States Department of Gastroenterology Children’s Hospital Los AngelesLos AngelesCA 90027United States Division of Gastroenterology Hepatology and NutritionCincinnati Children's Hospital Medical CenterCincinnatiOH 45229United States

BACKGrOUND Nonalcoholic fatty liver disease(NAFLD)is one of the most common chronic liver diseases in children and *** ranges in severity from isolated hepatic steatosis to nonalcoholic steatohepatitis(NASH),wherein hepatocellular inflammation and/or fibrosis coexist with *** microrNA(mirNA)levels have been suggested to be altered in NAFLD,but the extent to which mirNA are related to NAFLD features remains *** analysis tested the hypothesis that plasma mirNAs are significantly associated with histological features of NAFLD in *** To investigate the relationship between plasma mirNA expression and NAFLD features among adolescents with *** This study included 81 adolescents diagnosed with NAFLD and 54 adolescents without NAFLD from the Teen-Longitudinal Assessment of Bariatric Surgery ***-operative core liver biopsies were collected from participants and used to characterize histological features of *** samples were collected during surgery for mirNA profiling.A total of 843 plasma mirNAs were profiled using the HTG edgeSeq *** examined associations of plasma mirNAs and NAFLD features using logistic regression after adjusting for age,sex,race,and other key *** Pathways Analysis was used to identify biological functions of mirNAs that were associated with multiple histological features of *** We identified 16 upregulated plasma mirNAs,including mir-193a-5p and mir-193b-5p,and 22 downregulated plasma mirNAs,including mir-1282 and mir-6734-5p,in adolescents with ***,52,16,15,and 9 plasma mirNAs were associated with NASH,fibrosis,ballooning degeneration,and lobular inflammation,***,16 mirNAs were associated with two or more histological features of *** those mirNAs,mir-411-5p was downregulated in NASH,ballooning,and fibrosis,while mir-122-5p,mir-1343-5p,mir-193a-5p,mir-193b-5p,and mir-7845-5p were consistently and posi

关键词： MicrorNA Nonalcoholic fatty liver disease Non-alcoholic steatohepatitis Liver fibrosis Lobular inflammation Ballooning degeneration

Mixing and matching SMXL proteins to fine-tune strigolactone responses

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Molecular Plant 2024年第8期17卷 1167-1169页

作者： Jenna e.Hountalas Shelley Lumba Department of Cell&Systems Biology University of Toronto25 Willcocks StreetTorontoON M5S 3B2Canada Centre for the Analysis of Genome evolution and Function University of Toronto25 Willcocks StreetTorontoON M5S 3B2Canada

A common mechanism in plant hormone signaling is hormonedependent degradation of downstream *** the case of strigolactone(SL)signaling,one group of SUPPreSSOr OF MOre AXILLArY BrANCHeS 2(max2)1-LIKe(SMXL)proteins undergoes hormone-dependent degradation,while another does not.A recent publication in Molecular Plant by Li et al.(2024)illustrates that mixing and matching a SMXL resistant to SL degradation with a SMXL sensitive to SL degradation finely tunes SL *** phenomenon could reflect a naturally occurring negative transdominance,which is a dominantnegative effect arising not from a mutant allele of the same gene but rather from a different gene altogether(Veitia,2007).This trans-acting protein attenuates SL-dependent degradation of the SMXL *** findings have exciting implications for how different SMXL combinations could result in a gradient of SL responses.

关键词： complex. matching degradation

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如何吸引Z世代消费者

空中英语教室（高级版．彭蒙惠英语） 2024年第6期 22-23,44,45页

作者： max rhodes Lauren Cooks Levitan 不详

Z世代消费者已经成为零售业的核心焦点,很大程度上因为他们代表着约3600亿美元的可支配收,随着年轻一代到达经济成熟期,这个数字还会增长。此外,虽然电子商务常被认为是人类第一个智能手机世代的首选渠道,但我们的研究则显示,和数年前... 详细信息

Z世代消费者已经成为零售业的核心焦点,很大程度上因为他们代表着约3600亿美元的可支配收,随着年轻一代到达经济成熟期,这个数字还会增长。此外,虽然电子商务常被认为是人类第一个智能手机世代的首选渠道,但我们的研究则显示,和数年前相比。

关键词：零售业电子商务智能手机消费者世代年轻一代

Artificial intelligence meets body sense: task-driven neural networks reveal computational principles of the proprioceptive pathway

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Signal Transduction and Targeted Therapy 2024年第8期9卷 3147-3149页

作者： Leonard e.van Dyck Frank Bremmer Katharina Dobs Department of Psychology Justus Liebig University GiessenGiessenGermany max Planck Institute for Human Cognitive and Brain Sciences LeipzigGermany Center for Mind Brain and BehaviorUniversities of MarburgGiessenand DarmstadtMarburgGermany Department of Neurophysics Philipps-Universitat MarburgMarburgGermany

In a recent study published in Cell,Marin Vargas and Bisi et al.1 present an innovative approach to unravel the computational principles underlying proprioceptive processing in non-human *** findings showcase the utility of task-driven modeling in advancing neuroscience and offer translational potential by providing seminal insights into the goals and mechanisms by which the brain encodes body position and movements.

关键词： networks neural principles

HVOF-sprayed HAp/S53P4 BG composite coatings on an AZ31 alloy for potential applications in temporary implants

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Journal of Magnesium and Alloys 2024年第1期12卷 345-360页

作者： Carlos A.Poblano-Salas John Henao Astrid L.Giraldo-Betancur Paola Forero-Sossa Diego German espinosa-Arbelaez Jorge A.González-Sánchez Luis r.Dzib-Pérez Susana T.estrada-Moo Idelfonso e.Pech-Pech CIATeQ A.C. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico CONAHCYT-CIATeQ A.C. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico CONAHCYT-Cinvestav Libramiento Norponiente#2000.Fraccionamiento Real de JuriquillaQuerétaro 76230Mexico Universidad Tecnológica de Querétaro Av.Pie de la Cuesta N°2501Querétaro 76148Mexico CIDeSI Av.Playa Pie de la Cuesta No 702Col.San PabloQuerétaro 76125Mexico Center for Corrosion research Autonomous University of CampecheAv.Héroe de Nacozari No.480P.C.24070San Francisco de CampecheCam.Mexico

Bioactive thermal spray coatings produced via high-velocity oxygen fuel spray(HVOF)from hydroxyapatite(HAp)and bioactive glasses(BG)have the potential to be employed on temporary implants due to the ability of both HAp and BG to dissolve and promote osseointegration,considering that both phases have different reaction and dissolution rates under in-vitro *** the present work,75%***-25%wt.S53P4 bioactive glass powders were HVOF-sprayed to obtain HAp/S53P4 BG composite coatings on a bioresorbable AZ31 *** study is focused on exploring the effect of the stand-off distance and fuel/oxygen ratio variation as HVOF parameters to obtain stable structural coatings and to establish their effect on the phases and microstructure produced in those *** characterization techniques,such as scanning electron microscopy,X-ray diffraction,and Fourier transform infrared spectroscopy,were employed to characterize relevant structural and microstructural properties of the composite *** results showed that thermal gradients during coating deposition must be managed to avoid delamination due to the high temperature achieved(max 550℃)and the differences in coefficients of thermal *** was also found that both spraying distance and oxygen/fuel ratio allowed to keep the hydroxyapatite as the main phase in the *** addition,in-vitro electrochemical studies were performed on the obtained HAp/S53P4 BG composite coatings and compared against the uncoated AZ31 *** results showed a significant decrease in hydrogen evolution(at least 98%)when the bioactive coating was applied on the Mg alloy during evaluation in simulated body fluid(SBF).

关键词： Coatings Composites Thermal spray Temporary implants Hydrogen evolution