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Influence of curing conditions on the shrinkage behavior of three-dimensional printed concrete formwork

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Frontiers of Structural and civil Engineering 2024年第8期18卷 1225-1236页

作者： m.BEKAERT K.van TITTELBOOm G.de ScHUTTER magnel-vandepitte Laboratory for structural Engineering and Building materials Department of Structural Engineering and Building MaterialsFaculty of Engineering and ArchitectureGhent UniversityGhent 60 B-9052Belgium

The use of three-dimensional(3D)printed concrete as formwork is becoming more widely applied within the ***,the technology is still not optimized and there are many reports of preliminary cracking during the curing of cast *** is believed to result from differential shrinkage between the printed and cast *** cracks(in the printed concrete or at the interface between the infill and printed concrete)form a preferential path for aggressive substances and can reduce the durability of the combined concrete *** ensure the desired service life of the structure,it is important that the differential shrinkage between cast and printed concrete is *** study investigated the effect of curing conditions on the differential shrinkage behavior of 3D and cast *** influence of prewetting of the dry-cured 3D printed formwork was also *** the experimental program,a vibrated and self-compacting concrete were used as cast *** 3D printed formwork was produced and combined with cast concrete to simulate a concrete *** formwork was cured for 1,7,or 28 d exposed to the air(relative humidity:60%or 95%)or submerged in *** length change of the combined elements was observed over 56 d after concrete casting and throughout the thickness of the *** show that increasing the curing period in dry conditions of the printed concrete leads to an expansion of the formwork on the first day after *** expansion leads to a non-uniform strain evolution throughout the curing period of the combined *** concrete formwork stored in wet conditions does not expand after the casting process but tends to show a decreasing linear deformation within the whole elements.

关键词： 3D concrete printing formwork shrinkage curing

The miracle transplantation of a black leg by the surgeon saints cosmas and Damian

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Hepatobiliary Surgery and Nutrition 2024年第1期13卷 1-2页

作者： Thomas m.van Gulik Department of Surgery Amsterdam University Medical CenterUniversity of AmsterdamAmsterdamThe Netherlands

The miracle of the saints cosmas and Damian refers to transplantation of a black leg onto a white man that took place in medieval Rome(Figure 1)(1).A sexton of a church in Rome was seriously affected by cancer in his right *** into a delirious fever,he dreamed that the holy surgeons,saint cosmas and saint Damian,visited him and skilled as they were,decided to remove the affected leg and replace it with a healthy *** went to the grave of a recently deceased Ethiopian man and retrieved the right leg of this black man and took it to the *** sick leg of the sexton was amputated and they transplanted onto him the leg of the black *** their miracle operation,cosmas and Damian have been elevated to patron saints of the surgical profession and many surgical societies have adopted their names in honor of them.

关键词： black Figure replace

James Hogarth Pringle and his time-honored maneuver

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Hepatobiliary Surgery and Nutrition 2024年第3期13卷 391-392页

作者： Thomas m.van Gulik Department of Surgery Amsterdam University Medical CenterUniversity of AmsterdamAmsterdamThe Netherlands

The classical method to control blood loss during parenchymal transection of the liver is the Pringle *** his landmark article in the Annals of Surgery in 1908,James Hogarth Pringle occluded the afferent vessels to the liver by compressing the hepatoduodenal ligament between his thumb and index finger(1).He applied this maneuver in eight patients who required emergency laparotomy for major hemorrhage after severe liver *** he succeeded in controlling blood loss,the eight patients he described unfortunately all *** outcome did not prevent the Annals of Surgery from publishing his report after which James Hogarth Pringle was ready to enter the‘Hall of Fame’.Vascular inflow occlusion,applied in a continuous or intermittent fashion,became the mainstay technique for reducing blood loss during liver transection,and has remained so in the present era of laparoscopic and robotic liver resection(2).

关键词： Pringle Surgery patients

Excess dietary Lys reduces feed intake, stimulates jejunal ccK secretion and alters essential and non‑essential blood AA profile in pigs

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Journal of Animal Science and Biotechnology 2024年第3期15卷 1336-1346页

作者： maximiliano muller Elout van Liefferinge Alan Tilbrook Robert van Barneveld Eugeni Roura centre for Nutrition and Food Sciences Queensland Alliance for Agriculture and Food InnovationThe University of QueenslandBrisbaneQueensland 4072Australia Laboratory of Animal Nutrition and Animal Product Quality(LANUPRO) Department of Animal Sciences and Aquatic EcologyGhent University339000 GhentFlandersBelgium centre for Animal Science Queensland Alliance for Agriculture and Food Innovation and the School of Veterinary ScienceThe University of QueenslandBrisbaneQueensland 4072Australia SunPork Group BrisbaneQueensland 4009Australia

Background commercial diets are frequently formulated to meet or exceed nutrient levels including those of lim-iting essential amino acids(AA)covering potential individual variations within the ***,the provision of dietary excess of AA,such as Lys,may lead to reduced appetite and growth in *** mechanisms modulat-ing these responses have not been extensively *** study evaluated the effect of Lys dietary excesses on performance and satiety biomarkers in post weaning *** Twenty-four pigs aged 21 d and weighing 6.81±0.12kg(mean±SEm)were individually housed and offered 1 of 4 dietary treatments for 3weeks:a diet containing a standardized ileal digestible Lys reaching 100%(T0),120%(T1),150%(T2)or 200%(T3)of the NRc(2012)*** the end of the experiment,blood samples from the cephalic vein of the T0 and T3 groups were obtained for AA *** addition,primary intestinal cultures from T0 pigs were used,following their humane killing,to evaluate the effect of Lys on gut hormone secretion and AA sensors gene expression under ex vivo *** Feed intake was linearly reduced(Pced(Pcreased dietary levels of Lys during the third-and first-week post weaning,*** con-centration(Pmetabotropic glutamate receptor 1 and the solute carrier family 7 member 2(Pced in proximal jejunum tissues incubated with Lys at 20mmol/L when compared to the control(Lys 0mmol/L).Plasma Lys and Glu(Pconcentration increased in the T3 compared to T0 *** contrast,plasma levels of His,Val,Thr,Leu(Pconfirm that excess dietary Lys inhibits hunger in ***,the results provide evidence of pre-and post-absorptive mechanisms modulating these *** dietary excesses should be nar-rowed,when possible,to avoid negative effects of

关键词： Amino acid Blood cholecystokinin Feed intake Lysine Pig Satiety

changes in children’s cardiorespiratory fitness and body mass index over the course of the cOVID‑19 pandemic:a 34‑month longitudinal study of 331 primary school children

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World Journal of Pediatrics 2024年第2期20卷 185-188页

作者： Gerald Jarnig Reinhold Kerbl mireille N.m.van Poppel Institute of Human movement Science Sport and HealthUniversity of GrazMozartgasse 148010 GrazAustria Department of Pediatrics and Adolescent medicine LKH Hochsteiermark8700 LeobenAustria

In late 2019,heavy restrictions were enforced on public activities worldwide to diminish the spread of the severe acute respiratory syndrome coronavirus 2(SARS-coV-2)virus[1].These restrictions,which included school closures and strictly limited sports and leisure opportunities,particularly impacted children and adolescents[2].Lifestyle changes in children and adolescents led to reduced physical activity levels[2,3],increased sedentary behavior[3,4],changes in eating habits,and changes in sleep habits[3].

关键词： respiratory acute children

Performance of evolutionary optimized machine learning for modeling total organic carbon in core samples of shale gas fields

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Petroleum 2024年第1期10卷 150-164页

作者： Leonardo Goliatt c.m.Saporetti L.c.Oliveira E.Pereira Department of computational and Applied mechanics Federal University of Juiz de ForaJuiz de ForaBrazil Department of computational modeling Polytechnic InstituteRio de Janeiro State UniversityNova FriburgoBrazil Petrobras Rio de JaneiroBrazil Department of Stratigraphy and Paleontology Rio de Janeiro State UniversityRio de JaneiroBrazil

Rock samples'TOc content is the best indicator of the organic matter in source *** origin rock samples’analysis is used to calculate it manually by *** method requires time and resources because it relies on samples from many well intervals in source ***,research has been done to aid this *** learning algorithms can estimate total organic carbon instead of well logs and stratigraphic *** light of these efforts,the current work present a study on automating the total organic carbon estimation using machine learning approaches improved by an evolutionary methodology to give the model flexibility and *** algorithms,differential evolution,particle swarm optimization,grey wolf optimization,artificial bee colony,and evolution strategies were used to improve machine learning models to predict *** six metaheuristics were integrated into four machine learning methods:extreme learning machine,elastic net linear model,linear support vector regression,and multivariate adaptive regression *** samples from the YuDong-Nan shale gas field,located in the Sichuan basin,were used to evaluate the hybrid *** findings show that combining machine learning models with an evolutionary algorithms in a hybrid fashion produce flexible models that accurately predict *** results show that,independent of the metaheuristic used to guide the model selection,optimized extreme learning machines attained the best performance scores according to six *** hybrid models can be used in exploratory geological research,particularly for unconventional oil and gas resources.

关键词： Total organic carbon Hybrid models Automated machine learning Evolutionary algorithms Geology

Enabling low-cost decentralized power reserves adopting carbon dioxide for green methane exchange in stabilized clathrate adsorbent

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Journal of Energy chemistry 2024年第10期97卷 438-443,I0009页

作者： Lucas Hanssens maarten Houlleberghs c.Vinod chandran Geert Watson Sambhu Radhakrishnan Pascal van Der Voort Joeri F.m.Denayer christine E.A.Kirschhock Johan A.martens Eric Breynaert centre for Surface chemistry and catalysis-characterization and Application Team(cOK-KAT) 3001 LeuvenBelgium NmR/X-Ray Platform for convergence Research(NmRcoRe) 3001 LeuvenBelgium centre for Ordered materials Organometallics and Catalysis(COMOC)Department of ChemistryGhent University9000 GhentBelgium Department of chemical Engineering Vrije Universiteit Brussel1050 BrusselBelgium

*** circular methane energy systems In recent decades,methane-based energy systems have rapidly gained traction across the globe because of the increasing availability of low-cost methane production ***,fossil methane... 详细信息

关键词： Long duration energy storage Green methane carbon neutrality confined clathrate hydrates cH_(4)/cO_(2) exchange Direct gas exchange

Supramolecular Polymerization of Hydrogen-Bonded Trimers in Bulk and Aqueous medium

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ccS chemistry 2024年第6期6卷 1458-1465页

作者： Freek V.de Graaf Stef A.H.Jansen Sandra m.c.Schoenmakers Bas van Genabeek marle E.J.Vleugels Bart W.L.van den Bersselaar E.W.meijer Ghislaine vantomme Institute for complex molecular Systems Laboratory of Macromolecular and Organic ChemistryEindhoven University of Technology5600 MBEindhoven School of chemistry and RNA Institute University of New South WalesSydneyNew South Wales 2052

Synthetic molecules that form functional noncovalent assemblies in water have received much attention for their potential applications as *** this work,we introduce a novel water-compatible monomer based on the phthalhydrazide moiety that assembles into hydrogen-bonded trimeric *** bulk,the material exhibits a cylindrical nanostructure in the liquid-crystalline phase at elevated temperatures,morphologically distinct from the crystalline lamellar *** water,these molecules effectively form cylinders in a one-dimensional fashion,yielding fibrous *** formation of these supramolecular polymers follows a cooperative mechanism,as evidenced by denaturation *** trimerized pattern represents a new category of aqueous su pramolecular polymers with future prospects for functional complex molecular systems.

关键词： noncovalent chemistry supramolecular polymers hydrogen bonding cooperativity nanostructure

clinical-based phenotypes in children with pediatric post-cOVID-19 condition

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World Journal of Pediatrics 2024年第7期20卷 682-691页

作者： Lieke c.E.Noij Jelle m.Blankestijn coen R.Lap marlies A.van Houten Giske Biesbroek Anke-Hilse maitland-van der Zee mahmoud I.Abdel-Aziz Johannes B.van Goudoever mattijs W.Alsem caroline L.H.Brackel Kim J.Oostrom Simone Hashimoto Suzanne W.J.Terheggen-Lagro Department of Pediatric Pulmonology and Allergy Amsterdam UMCLocation AMCEmma Children’s HospitalAmsterdam University Medical CenterRoom G2-222Meibergdreef 91105AZAmsterdamThe Netherlands Department of Pulmonary medicine Amsterdam UMCAmsterdamThe Netherlands Department of Pediatrics Spaarne GasthuisHoofddorpThe Netherlands Department of Pediatrics Emma Children’s HospitalAmsterdam University Medical CenterAmsterdamThe Netherlands Department of Rehabilitation medicine Amsterdam Movement SciencesMeibergdreef 9AmsterdamThe Netherlands Department of Paediatric Pulmonology Department of PaediatricsTergooi MCHilversumThe Netherlands Department of child and Adolescent Psychiatry and Psychosocial care Amsterdam UMCAmsterdam Reproduction and DevelopmentAmsterdamThe Netherlands

Background Pediatric post coronavirus disease 2019(cOVID-19)condition(PPcc)is a heterogeneous syndrome,which can significantly affect the daily lives of *** study aimed to identify clinically meaningful phenotypes in children with PPcc,to better characterize and treat this *** Participants were children with physician-diagnosed PPcc,referred to the academic hospital Amsterdam Umc in the Netherlands between November 2021 and march *** factors and information on post-cOVID symptoms,comorbidities,and impact on daily life were *** clusters were identified using an unsupervised and unbiased approach for mixed data *** Analysis of 111 patients(aged 3–18 years)revealed three distinct clusters within *** 1(n=62,median age=15 years)predominantly consisted of girls(74.2%).These patients suffered relatively more from exercise intolerance,dyspnea,and smell *** 2(n=33,median age=13 years)contained patients with an even gender distribution(51.5%girls).They suffered from relatively more sleep problems,memory loss,gastrointestinal symptoms,and *** 3(n=16,median age=11 years)had a higher proportion of boys(75.0%),suffered relatively more from fever,had significantly fewer symptoms(median of 5 symptoms compared to 8 and 10 for clusters 1 and 2 respectively),and experienced a lower impact on daily *** This study identified three distinct clinical PPcc phenotypes,with variations in sex,age,symptom patterns,and impact on daily *** findings highlight the need for further research to understand the potentially diverse underlying mechanisms contributing to post-cOVID symptoms in children.

关键词： Adolescents clusters Long cOVID Pediatric Phenotypes Post-cOVID syndrome