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See detailEnergy Dissipation Within the Wave Run-Up at Stepped Revetments
Kerpen, Nils B.; Bung, Daniel B.; Valero Huerta, Daniel ULg et al

in Journal of Ocean University of China (2017), 16(4), 649-654

To understand the processes and energy dissipation performance caused by turbulence during the wave run-up over a stepped revetment, hydraulic model tests with steady flow conditions are conducted and ... [more ▼]

To understand the processes and energy dissipation performance caused by turbulence during the wave run-up over a stepped revetment, hydraulic model tests with steady flow conditions are conducted and correlated with unsteady flow conditions of the wave run-up within a short time frame. Under irregular waves, the run-up reduction over a stepped revetment is dependent on the Iribarren number and decreases for decreasing Iribarren numbers. Velocity gradients are found to be similar in a steady and unsteady flow regime near the pseudo-bottom. [less ▲]

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See detailChondrocyte secretome: a source of novel insights and exploratory biomarkers of osteoarthritis
Sanchez, Christelle ULg; Bay-Jensen, Anne-Christine; Pap, Thomas et al

in Osteoarthritis and Cartilage (2017), 25

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See detailAnalysis of the non-Markovianity for electron transfer reactions in the oligothiophene-fullerene in an heterojunction
Mangaud, Etienne; Meier, Christoph; Desouter, Michèle ULg

in Chemical Physics (2017), 494

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See detailEYK1 encoding erythrulose kinase as a catabolic selectable marker for genome editing in the non-conventional yeast Yarrowia lipolytica
Vandermies, Marie ULg; Denies, Olivia ULg; Nicaud, Jean-Marc et al

in Journal of Microbiological Methods (2017), 139

We report here on EYK1, encoding erythrulose kinase, as an efficient catabolic selectable marker for genome editing in Y. lipolytica. Compared to auxotrophic markers, EYK1 increases the growth rate of ... [more ▼]

We report here on EYK1, encoding erythrulose kinase, as an efficient catabolic selectable marker for genome editing in Y. lipolytica. Compared to auxotrophic markers, EYK1 increases the growth rate of transformants and allows improved efficiency of transformation. The utility of the marker EYK1 in a replicative vector was also demonstrated. [less ▲]

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See detailSearch for the signatures of mass-exchange episodes in massive binaries
Raucq, Françoise ULg

Doctoral thesis (2017)

Massive stars are known for their crucial role in our Universe, through their extreme stellar parameters, leading to a strong impact on their environment. However, there remain numbers of unanswered ... [more ▼]

Massive stars are known for their crucial role in our Universe, through their extreme stellar parameters, leading to a strong impact on their environment. However, there remain numbers of unanswered questions concerning the exact processes of their formation, their stability or the processes driving their strong stellar winds. In the context of this thesis work, we adress one of the most interesting of their peculiarities: their tendency to be part of binary of higher multiplicity systems. Whilst this multiplicity does help to solve some open issues by allowing us to study some of the fundamental properties of the stars, such as their minimum masses and radii as well as their stellar luminosities, it can also lead to interactions between the components of a system, which affect the subsequent evolution of the stars and give rise to additional open questions on the processes in place in such systems. Among the possible interactions taking place within close binary systems is the possibility of a transfer of mass and kinetic momentum through a Roche lobe overflow. This process has a huge impact on the subsequent evolution of both components and many aspects of this phenomenon are not well understood yet. The present work is devoted to the search for the signatures of such past mass-exchange episodes in a sample of four short-period massive multiple systems: HD 149404, LSS 3074, HD 17505 and HD 206267. We determined a new orbital solution for three of them. We then used phase-resolved spectroscopy to perform the spectral disentangling of the optical spectra of the components. The spectral disentangling is a mathematical tool which allows to separate the contributions of both components to the observed spectra of a system. We then analysed the reconstructed spectra with the CMFGEN atmosphere code to determine stellar parameters, such as the effective temperatures and surface gravities, and to constrain the surface chemical composition of each component. The first two parts of this dissertation are dedicated to the scientific background and the description of the numerical tools and methods used in this work. The third part presents our studies of the selected massive systems. We confirmed that the hypothesis of a past Roche lobe overflow episode is most plausible to explain the observed properties of the components of HD 149404. Photometric data permitted us to confirm that LSS 3074 is in an overcontact configuration, and a combined analysis with spectroscopy showed that the system has lost a significant fraction of its mass to its surroundings. We proposed several possible evolutionary pathways involving a Roche lobe overflow process to explain the current parameters of its components. We found no evidence of past mass-transfer episodes in the spectra of HD 17505 and showed that the current properties of its components can be explained by single star evolutionary models including rotational mixing. We found clues of binary interactions in the spectra of HD 206267, but suggested that the system did not experience a complete Roche lobe overflow episode at this stage of its evolution. [less ▲]

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See detailInnovative polyelectrolytes/poly(ionic liquid)s for energy and environment
Ajjan, Fátima N.; Ambrogi, Martina; Tiruye, Girum Ayalneh et al

in Polymer International (2017), 66(8), 1119-1126

This manuscript presents the work carried out within the European Project RENAISSANCE-ITN, which was dedicated to the development of innovative polyelectrolytes for energy and environmental applications ... [more ▼]

This manuscript presents the work carried out within the European Project RENAISSANCE-ITN, which was dedicated to the development of innovative polyelectrolytes for energy and environmental applications. Within the project different types of innovative polyelectrolytes were synthesized such as poly(ionic liquid)s coming from renewable or natural ions, thiazolium cations, cathechol functionalities or from a new generation of cheap deep-eutectic monomers. Further, macromolecular architectures such as new poly(ionic liquid) block copolymers and new (semi)conducting polymer/polyelectrolyte complexes were also developed. As the final goal, the application of these innovative polymers in energy and environment was investigated. Important advances in energy storage technologies included the development of new carbonaceous materials, new lignin/conducting polymer biopolymer electrodes, new iongels and single-ion conducting polymer electrolytes for supercapacitors and batteries and new poly(ionic liquid) binders for batteries. On the other hand, the use of the innovative polyelectrolytes into sustainable environmental technologies led to the development of new liquid and dry water, new materials for water cleaning technologies such as floculants, oil absorbers, new recyclable organocatalysts platform and multifunctional polymer coatings with antifouling and antimicrobial properties. All in all this article demonstrates the potential of the poly(ionic liquid)s for high-value applications in Energy & Enviromental areas. [less ▲]

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See detailOrganometallic-mediated alternating radical copolymerization of tert-butyl-2- trifluoromethacrylate with vinyl acetate and synthesis of block copolymers thereof
Banerjee, Sanjib; Ladmiral, Vincent; Debuigne, Antoine ULg et al

in Macromolecular Rapid Communications (2017), 38(15), 1700203

Organometallic-mediated radical polymerization (OMRP) has given access to well-defined poly(vinyl acetate-alt-tert-butyl-2-trifluoromethacrylate)-b-poly(vinyl acetate) and poly (VAc- alt-MAF-TBE ... [more ▼]

Organometallic-mediated radical polymerization (OMRP) has given access to well-defined poly(vinyl acetate-alt-tert-butyl-2-trifluoromethacrylate)-b-poly(vinyl acetate) and poly (VAc- alt-MAF-TBE) copolymers composed of two electronically distinct monomers: vinyl acetate (VAc, donor, D) and tert-butyl-2-trifluoromethacrylate (MAF-TBE, acceptor, A), with low dispersity (≤1.24) and molar masses up to 57 000 g mol−1. These copolymers have a precise 1:1 alternating structure over a wide range of comonomer feed compositions. The reactivity ratios are determined as rVAc = 0.01 ± 0.01 and rMAF-TBE = 0 at 40 °C. Remarkably, from a feed containing >50% molar VAc content, poly(VAc-alt-MAF-TBE)-b- PVAc block copolymers are produced via a one- pot synthesis. Such diblock copolymers exhibit two glass transition temperatures attributed to the alternating and homopolymer sequences. The OMRP of this fluorine-containing alter- nating monomer system may provide access to a wide range of new polymer materials. [less ▲]

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See detailSpeeding up dioxin analysis: extending the instrumental comfort zone
Calaprice, Chiara ULg; Focant, Jean-François ULg

Scientific conference (2017, August)

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See detailLe vocabulaire des archives des cités grecques : l’apport de l’épigraphie. Le cas des termes ἀποδέκτης et ἀποδοχεύς
Dolne, Laëtitia ULg

Poster (2017, August)

Ce poster est issu d’un projet de thèse récemment débuté à l’Université de Liège et consacré à l’étude du vocabulaire technique des différents aspects de l’archivage dans les cités grecques antiques. Un ... [more ▼]

Ce poster est issu d’un projet de thèse récemment débuté à l’Université de Liège et consacré à l’étude du vocabulaire technique des différents aspects de l’archivage dans les cités grecques antiques. Un des objectifs du projet est de réaliser un lexique systématique, exhaustif et raisonné, fondé sur une analyse approfondie et contextualisée des sources littéraires, épigraphiques et papyrologiques grecques et latines de c. IIIe s. av. J.-C. à c. IIIe s. apr. J.-C. Une fois achevé, le lexique facilitera pour tous l’accès aux sources de l’activité archivistique ancienne et, de ce fait, sa compréhension et son étude dans un cadre plus global. En effet, la lecture de ces sources est entravée par la diversité et la technicité des termes qui y abondent et peuvent avoir, selon le contexte, mais aussi le lieu et l’époque, des acceptions différentes, et donc désigner des réalités distinctes. Le poster illustre cette problématique, ainsi que la méthodologie employée dans le projet, par l’exemple des termes ἀποδέκτης et ἀποδοχεύς. Alimenté principalement par la documentation épigraphique, le cas de figure choisi montre également l’important apport de cette discipline pour la réalisation d’un tel lexique. [less ▲]

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See detailLe flâneur et l'ethnographe. Sur le savoir des Physiologies
Stienon, Valérie ULg

in La Licorne (2017)

Les Physiologies parues dans la première moitié du XIXe siècle dans la presse satirique illustrée et les collections des éditeurs de pittoresques livrent un certain savoir sur la société parisienne de la ... [more ▼]

Les Physiologies parues dans la première moitié du XIXe siècle dans la presse satirique illustrée et les collections des éditeurs de pittoresques livrent un certain savoir sur la société parisienne de la Monarchie de Juillet. Elles le font en situant les contemporains dans leur biotope métropolitain et en pratiquant des formes de microsociologie par consignation des us et coutumes saisis à travers le prisme de l’observation quotidienne in situ. De ce point de vue, ces textes semblent proches de documents d’ethnographie critique, si on conçoit l’ethnographie comme la discipline qui s’occupe de la collecte sur le terrain de données anthropologiques et sociales. Ce geste ethnographique a pu être préparé par la rencontre du regard du clinicien sur le social et du réflexe classificateur du naturaliste auxquels s’ajoutent des données factuelles historiques : l’anthropologie française se développe à Paris dès 1799, suite à la découverte de l’enfant sauvage de l’Aveyron, avec la Société des observateurs de l’homme. Si celle-ci est dissoute très tôt, en 1804, d’autres groupements prennent le relais et, en 1839, la Société ethnologique est créée à Paris. Revenant sur le contexte qui prépare la naissance des disciplines ethnologique et sociologique, cette étude propose de croiser les scénographies énonciatives de l’ethnographe mises en œuvre dans les Physiologies à une autre figure du savoir en déambulation qu’elles thématisent abondamment, celle du flâneur, pour déterminer leurs généalogies littéraires et leurs apports respectifs au savoir (pré)sociologique manifesté par ces textes dans leur poétique d’écriture situable entre presse engagée, littérature et sciences du vivant. [less ▲]

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See detailCan electoral inequalities be legally justified?
Bouhon, Frédéric ULg

in European Review of Public Law (2017), 2016(Automn), 839-879

In light of the principle of equality, German, Belgian and British election law contain some legal rules that tend to distribute the faculty to influence the composition of the elected assemblies equally ... [more ▼]

In light of the principle of equality, German, Belgian and British election law contain some legal rules that tend to distribute the faculty to influence the composition of the elected assemblies equally among the governed people, and others that tend to distribute it unequally. The inequality caused by the latter group may be to some extent legally justified by concerns for the general interest, but also provides rulers with means that help them to remain in power, which is hardly justifiable from a legal perspective. In these legal systems, parties are expected to gain a significant portion of the people’s support: not only should the parliament (as a whole) and its members (as individuals) represent the governed people, but the parties themselves are expected to be sufficiently representative of the people in order to access the legislative assemblies. Notably, this thesis draws examples from the case law of the European Court of Human Rights, from which relevant decisions are mentioned here. [less ▲]

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See detailHydrothermal synthesis in presence of carbon black: Particle-size reduction of iron hydroxyl phosphate hydrate for Li-ion battery
Karegeya, Claude ULg; Mahmoud, Abdelfattah ULg; Cloots, Rudi ULg et al

in Electrochimica Acta (2017), 250

Iron hydroxyl phosphate hydrate Fe1.19(PO4)(OH)0.57(H2O)0.43 (FPHH) was obtained by hydrothermal synthesis at 220 °C for 6 hours. Addition of carbon black to the solution before hydrothermal treatment led ... [more ▼]

Iron hydroxyl phosphate hydrate Fe1.19(PO4)(OH)0.57(H2O)0.43 (FPHH) was obtained by hydrothermal synthesis at 220 °C for 6 hours. Addition of carbon black to the solution before hydrothermal treatment led to a reduction of the FPHH particle size from ∼10 μm in the carbon-free compound to ∼300–500 nm in the FPHH-10%C and FPHH-20%C composite with a good dispersion of conducting carbon black. X-ray diffraction, 57Fe Mossbauer spectroscopy and a thermal decomposition study showed that the addition of carbon black did not interfere with the formation of the FPHH phase. Thanks to its favorable microstructural characteristics, the FPHH-10%C and FPHH-20%C material exhibited good performance as positive electrode for Li-ion battery, with high initial discharge capacities of 150, 128 and 112 mAh g−1 at 0.25C, 0.5C and 1C rates respectively and 99% capacity retention after 150 cycles at 2C. These results show that addition of solid carbon directly into the solution prior to hydrothermal treatment is a simple and effective way to reduce particle size and also to improve electronic conductivity by dispersing conductive carbon around the active material. This approach is easily transferable to other compounds prepared by hydrothermal synthesis, in order to control particle size while retaining the advantage of crystallization at low temperature. [less ▲]

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See detailCompte rendu des "Extras du Cifen" : année académique 2016-2017
Guillaume, Jean-François ULg; Van Hoof, Florence ULg; Mouton, Alexandre ULg et al

in Didactiques en Pratique (2017), 3

Ce compte rendu fait état de quatre activités organisées dans le cadre des "Extras du Cifen" lors de l'année académique 2016-17 : la conférence de Liana PINIAU sur la dyslexie (30/11/2016), la conférence ... [more ▼]

Ce compte rendu fait état de quatre activités organisées dans le cadre des "Extras du Cifen" lors de l'année académique 2016-17 : la conférence de Liana PINIAU sur la dyslexie (30/11/2016), la conférence d'Elisabeth BAUTIER sur le langage (9/3/2017), la conférence de Loïc GISCHER sur la prévention du harcèlement (29/03/2017), et l'atelier organisé par Alexandre Mouton sur les premiers secours (3/5/2017). [less ▲]

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See detail« Oser sauver à l’école » : Mise en place d’un cycle de premier secours au cours d’éducation physique
Collin, Manon ULg; Cloes, Marc ULg; Laurent, Charlotte et al

in Didactiques en Pratique (2017), 3

En Europe et aux États-Unis, plus de 700 000 personnes décèdent chaque année des suites d’un arrêt cardiaque (Berdowski et al. 2010). Avec un taux de survie de 2 à 10 % (European Resuscitation Council ... [more ▼]

En Europe et aux États-Unis, plus de 700 000 personnes décèdent chaque année des suites d’un arrêt cardiaque (Berdowski et al. 2010). Avec un taux de survie de 2 à 10 % (European Resuscitation Council, 2015), le pronostic vital associé aux arrêts cardiaques est, dès lors, relativement limité. Celui-ci peut être cinq à sept fois supérieur si un témoin pratique une réanimation cardio-pulmonaire (RCP) et une défibrillation durant les premières minutes d’intervention (ERC, 2015). Dans le cadre de cette étude pilote, l’objectif était d’analyser la pertinence, l’impact et la faisabilité de la mise en place d’un cycle de premiers secours dans un contexte scolaire, et, plus particulièrement, dans le programme du cours d’éducation physique. Le cycle, d'une durée de 6 semaines (6 x 50 minutes), a été dispensé à deux classes de rhétoriques (n=51). Les compétences des élèves ont été évaluées à l'aide d'un questionnaire avant et après le cycle, ainsi qu'une grille d'observation évaluant les habiletés gestuelles des élèves lors d'un protocole complet de réanimation de base d’une personne adulte avec un DEA. La moyenne des résultats des élèves au questionnaire est passée de 6,12 ± 3,25/20 (0,5-14) lors du pré-test à 17,32 ± 1,79 /20 (10,5-20) à l’issue du cycle (p=0,00). La moyenne au test pratique est de 17,16 ± 1,72/20 (13,66-20). La séquence de cours proposée a permis d’améliorer les connaissances théoriques des élèves, leurs habiletés gestuelles et leur confiance par rapport à leur capacité à porter secours à une victime d’un arrêt cardiaque, et s'inscrit clairement dans la philosophie du Pacte pour un Enseignement d’Excellence. [less ▲]

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See detailNUMERICAL STUDY OF TURBULENT OSCILLATIONS AROUND A CYLINDER: RANS CAPABILITIES AND SENSITIVITY ANALYSIS
Valero Huerta, Daniel ULg; Bung, Daniel B.; Erpicum, Sébastien ULg et al

in Proceedings of the 37th IAHR World Congress (2017, August)

Numerical modelling is commonly used in a large range of environmental fluid mechanics applications. It has become widely accepted and, with increasing computer power, the employed models are increasing ... [more ▼]

Numerical modelling is commonly used in a large range of environmental fluid mechanics applications. It has become widely accepted and, with increasing computer power, the employed models are increasing also in complexity. Reynolds Averaged Navier-Stokes (RANS) equations are the preferred approach for 3D problems, being especially suited for the computation of the mean flow. However, little is known about RANS performance for the fluctuating quantities; being reasonable to expect an impairment in the accuracy. In this study, a simple geometry (cylindrical pier) is subject to different numerical settings in order to assess their effect on the development of the physically based flow instabilities. Mesh refinement has shown to enhance the perturbation growth rate while maximum CFL value has not produced any effect. RNG k-ϵ and k-ω have shown to be more dissipative than k-ϵ. Some advection schemes seem to increase the spurious perturbation converging to the physically based ones. Finally, introducing an experimentally based perturbation at the inlet has proven to speed up the process. [less ▲]

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See detailFLOWCV - AN OPEN-SOURCE TOOLBOX FOR COMPUTER VISION APPLICATIONS IN TURBULENT FLOWS
Bung, Daniel B.; Valero Huerta, Daniel ULg

in Proceedings of the 37th IAHR World Congress (2017, August)

Despite the continuous advances in numerical modeling methods and the continuous increase of computer power and storage capacities in the last decades, physical modeling remains a common technique for ... [more ▼]

Despite the continuous advances in numerical modeling methods and the continuous increase of computer power and storage capacities in the last decades, physical modeling remains a common technique for evaluation of flow processes. One major advantage of this classical approach is given by the transparency of experiments as the flow can be easily observed in the laboratory and effects of changing boundary conditions may be better understood. Nowadays, the flow is commonly captured in most experiments with means of digital cameras or high-speed cameras to get a better insight and for further analyses after the model test. Besides some well-known techniques, such Particle Image Velocimetry, some new methods can be found in Computer Vision disciplines allowing for more detailed investigation of the images. This paper presents two modules of the new open-source toolbox FlowCV which has been developed to be applied in hydraulic laboratories. The first module is given by a synthetic particle image generator which provides the user with particle images of a predefined motion and turbulence. The second module implements different Optical Flow methods for determination of obstacle movement (here: particle movement). The Farnebäck method, which is presented in this paper, gives dense velocity fields, i.e. velocity data for every image pixel. The Optical Flow results based on the synthetic images are then benchmarked against their predefined particle velocity. It will be shown that even smallest turbulent flow structures are adequately detected. [less ▲]

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See detailPrevalence of voice disorders among teachers at the beginning of their career
Schiller, Isabel ULg

Poster (2017, August)

Due to the high vocal demands associated with their profession, teachers face an increased risk of developing voice disorders. Research suggests that up to 50 % of experienced teachers are affected. Even ... [more ▼]

Due to the high vocal demands associated with their profession, teachers face an increased risk of developing voice disorders. Research suggests that up to 50 % of experienced teachers are affected. Even student teachers, whose vocal load is still relatively low, report voice problems with a frequency of 20 % (Simberg, Laine, Sala, & Rönnemaa, 2000). Little is known about the prevalence of voice disorders among teachers at the very beginning of their career. In Germany, teachers must complete a two-year teaching practice as part of their professional training after they graduate from university, consisting of attending specialized courses and giving lessons. The aim of this symptom-based study was to determine the prevalence of voice problems among this population. A self-administered questionnaire was answered by 73 German teachers in teaching practice. The prevalence of a voice problem was defined based on the presence of two symptoms that persisted for a minimum of two weeks. Results revealed that 37 % of teachers had voice problems during their teaching practice. Among the most frequent symptoms were hoarseness, an urge to clear one’s throat and problems speaking at a loud voice. Considering that the participants had not even begun teaching full-time, the prevalence of reported voice problems is worrisome. It could be associated with their lacking experience in how to use their voice effectively. The findings highlight the necessity of early intervention programs focusing on vocal hygiene and effective voice use in classroom situations. [less ▲]

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See detailAssessment of Continuous Pain in Newborns admitted to NICUs in 18 European Countries
Anand, Kanwaljeet; Eriksson, Mats; Boyle, Elaine et al

in Acta Paediatrica (2017), 106(8), 1248-59

Aim: Continuous pain occurs routinely, even after invasive procedures, or inflammation and surgery, but clinical practices associated with assessments of continuous pain remain unknown. Methods: A ... [more ▼]

Aim: Continuous pain occurs routinely, even after invasive procedures, or inflammation and surgery, but clinical practices associated with assessments of continuous pain remain unknown. Methods: A prospective cohort study in 243 Neonatal Intensive Care Units (NICUs) from 18 European countries recorded frequency of pain assessments, use of mechanical ventilation, sedation, analgesia, or neuromuscular blockade for each neonate upto 28 days after NICU admission. Results: Only 2113/6648 (31·8%) of neonates received assessments of continuous pain, occurring variably among tracheal ventilation (TrV, 46·0%), noninvasive ventilation (NiV, 35· 0%), and no ventilation (NoV, 20· 1%) groups (p<0· 001). Daily assessments for continuous pain occurred in only 10·4% of all neonates (TrV: 14· 0%, NiV: 10· 7%, NoV: 7· 6%; p<0· 001). More frequent assessments of continuous pain occurred in NICUs with pain guidelines, nursing champions, and surgical admissions prompted (all p<0·01), and for newborns <32 weeks gestational age, those requiring ventilation, or opioids, sedatives-hypnotics, general anesthetics (O-SH-GA) (all p<0·001), or surgery (p=0· 028). Use of O-SH-GA drugs increased the odds for pain assessment in the TrV (OR:1· 60, p<0·001) and NiV groups (OR:1·40, p<0· 001). Conclusion: Assessments of continuous pain occurred in less than one-third of NICU admissions, and daily in only 10% of neonates. NICU clinical practices should consider including routine assessments of continuous pain in newborns. [less ▲]

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