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See detailIn vitro evaluation of the competing effect of Carnobacterium maltaromaticum isolated from vacuum packed meat against food pathogens
Maia Danielski, Gabriela ULiege; Didimo Imazaki, Pedro Henrique ULiege; Daube, Georges ULiege et al

Conference (2017, August 15)

Foodborne disease outbreaks are one of the leading causes of infections, hospitalizations and deaths provoked by pathogenic bacteria including Escherichia coli O157:H7, Listeria monocytogenes and ... [more ▼]

Foodborne disease outbreaks are one of the leading causes of infections, hospitalizations and deaths provoked by pathogenic bacteria including Escherichia coli O157:H7, Listeria monocytogenes and Salmonella spp. Carnobacterium maltaromaticum is a lactic acid bacteria, which could prevent the growth of pathogens in refrigerated food. The aim of this study was to determine the bioprotective potential of three strains of C. maltaromaticum isolated from chilled vacuum packed beef. They were tested in vitro against the pathogens described above. The results indicate that the selected strains have an antilisterial activity, which is optimized at low temperatures. Moreover, when the strains were combined with EDTA it was observed a slight, but significant, inhibition of the gram-negative bacteria used in this study. [less ▲]

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See detailInternet, vecteur d'un nouvel élan politique ?
Demelenne, Céline; Grandjean, Geoffrey ULiege

Article for general public (2017)

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See detailSense-Making in Cyber Security - Examining Responder Behaviors in Cyber-Attacks
Tapanainen, Tommi ULiege

in Proceedings of the Americas Conference on Information Systems (AMCIS) (2017, August 12)

Our understanding of the defense mechanisms against cyber-attacks is, to a great extent, based on preparation and deterrence. There is limited understanding, and in particular, limited evidence on how ... [more ▼]

Our understanding of the defense mechanisms against cyber-attacks is, to a great extent, based on preparation and deterrence. There is limited understanding, and in particular, limited evidence on how cyber security responders act to contain and recover from a cyber-attack. The actions of responders, including IT experts, corporate communications staff, and selected managers are critical. To address this gap, this research proposes applying the concept of sense-making, which has been extensively used to analyze human crisis behaviors. In this emerging research, we conduct an investigation into a cyber-attack case to shed light on the contextual and collective activities taken by responders in coping with cyber-attack response. We expect the results to validate or challenge theorizations of cyber security training and competencies from the communication and collaboration perspective. In a practical sense, our research can stimulate organizations to reflect on their own cyber security preparedness from the human perspective. [less ▲]

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See detailSuperparamagnetic colloids in viscous fluids
Darras, Alexis ULiege; Opsomer, Eric ULiege; Vandewalle, Nicolas ULiege et al

in Scientific Reports (2017), 7

The influence of a magnetic field on the aggregation process of superparamagnetic colloids has been well known on short time for a few decades. However, the influence of important parameters, such as ... [more ▼]

The influence of a magnetic field on the aggregation process of superparamagnetic colloids has been well known on short time for a few decades. However, the influence of important parameters, such as viscosity of the liquid, has received only little attention. Moreover, the equilibrium state reached after a long time is still challenging on some aspects. Indeed, recent experimental measurements show deviations from pure analytical models in extreme conditions. Furthermore, current simulations would require several years of computing time to reach equilibrium state under those conditions. In the present paper, we show how viscosity influences the characteristic time of the aggregation process, with experimental measurements in agreement with previous theories on transient behaviour. Afterwards, we performed numerical simulations on equivalent systems with lower viscosities. Below a critical value of viscosity, a transition to a new aggregation regime is observed and analysed. We noticed this result can be used to reduce the numerical simulation time from several orders of magnitude, without modifying the intrinsic physical behaviour of the particles. However, it also implies that, for high magnetic fields, granular gases could have a very different behaviour from colloidal liquids. [less ▲]

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See detailA novel approach towards manipulation of vortex matter in a superconductor with micromagnetic structures
Shaw, Gorky ULiege

Poster (2017, August 10)

Hard permanent magnetic materials offer a number of advantages over softer magnetic materials as sources of vortex pinning in a superconductor, like greater stability and larger magnetic field amplitudes ... [more ▼]

Hard permanent magnetic materials offer a number of advantages over softer magnetic materials as sources of vortex pinning in a superconductor, like greater stability and larger magnetic field amplitudes. Permanent micromagnet structures prepared using thermomagnetic patterning (TMP) present an interesting and so far unexplored option for controlled artificial pinning. We have investigated the vortex matter in superconductor/TMP micromagnet heterostructures (Nb-NdFeB) using quantitative Magneto-Optical Imaging (MOI). Comprehensive protocols have been developed for calibrating and converting Faraday rotation data acquired by MOI to magnetic field maps. These protocols reveal the comparatively weaker magnetic response of the superconductor from the background of larger fields associated with the magnetic layer in its vicinity. Further, TMP micromagnet structures have been imprinted in a Permalloy (Py) layer to obtain flexible magnetic landscapes for flux guidance in a Nb layer below it. Both smooth flux penetration and vortex avalanches in Nb are observed to be strongly influenced by the micromagnetic patterns. Our study offers new insights into the peculiarities of the vortex state in these superconductor-micromagnet heterostructures. [less ▲]

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See detailTailoring the superconducting properties of niobium nanoconstrictions via electro-annealing
Lombardo, Joseph ULiege; Baumans, Xavier ULiege; Jelic, Zeljko ULiege et al

Poster (2017, August 10)

In this work we report the possibility to create weak links in nanostructured Nb thin films using electro-annealing. By using electron-assisted atom diffusion in Nb nanconstrictions, we were able to ... [more ▼]

In this work we report the possibility to create weak links in nanostructured Nb thin films using electro-annealing. By using electron-assisted atom diffusion in Nb nanconstrictions, we were able to locally change the material properties (superconducting critical temperature and normal resistance). When the critical temperature of the nanoconstriction is sufficiently decreased, the field dependence of the critical current exhibits a Fraunhofer-like pattern, confirming the formation of the weak link. Scanning electron microscopy images clearly reveals the structural change underwent by the constriction resulting from the effect of the high current density. Numerical simulations within the Ginzburg-Landau formalism are also presented. These findings represent the first evidence of weak link formation by electro-annealing and provide an easy method for the fabrication of Josephson junctions with tunable resistance and critical temperature in Nb thin films. [less ▲]

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See detailORBi : an institutional repository to promote Open Access
Chalono, Dominique ULiege; Thirion, Paul ULiege

Conference (2017, August 09)

Since 2008 the University of Liège as implemented an institutional repository - ORBi - based on a strong mandate. Every member of the ULiège must upload the bibliographic references of all of his/hers ... [more ▼]

Since 2008 the University of Liège as implemented an institutional repository - ORBi - based on a strong mandate. Every member of the ULiège must upload the bibliographic references of all of his/hers scientific publications and communications. The deposit of full text is also mandatory for scientific articles published since 2002. The internal evaluation at ULiège will only take into account publications deposited in ORBi. More than a repository, ORBi has become a tool to develop and inform on the concept of Open Science and Open access by allowing researchers to be part of the movement and to actively participate in the diffusion of their own production. By demanding authors to check by themselves the publisher’s policies and author’s copyright, ORBi has contributed to raise awareness on the unfair practices of big publishers. It has also demonstrated the need to rebalance a publication model that is no longer affordable by those who produce the main information. Additional tools developed by the ORBi team (statistics, request-a- print system, automated publications list) also help to give substance to the many benefices of open access (increase of citations, visibility, contacts and connections). [less ▲]

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See detailMathematical modeling of extracorporeal CO2 removal therapy. A validation carried out on ten pigs
Habran, Simon ULiege; Desaive, Thomas ULiege; MORIMONT, Philippe ULiege et al

in Medical & Biological Engineering & Computing (2017)

The extracorporeal CO2 removal device (ECCO2RD) is used in clinics to treat patients suffering from respiratory failures like acute respiratory distress syn- drome (ARDS) or chronic obstructive pulmonary ... [more ▼]

The extracorporeal CO2 removal device (ECCO2RD) is used in clinics to treat patients suffering from respiratory failures like acute respiratory distress syn- drome (ARDS) or chronic obstructive pulmonary disease (COPD). The aim of this device is to decarboxylate blood externally with low blood flow. A mathematical model is proposed to describe protective ventilation, ARDS, and an extracorporeal CO2 removal therapy (ECCO2RT). The sim- ulations are compared with experimental data carried out on ten pigs. The results show a good agreement between the mathematical simulations and the experimental data, which provides a nice validation of the model. This model is thus able to predict the decrease of PCO2 during ECCO2RT for different blood flows across the extracorporeal lung support. [less ▲]

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See detailState of Martian Upper Atmosphere as Observed by Imaging Ultraviolet Spectroscope Onboard MAVEN
Jain; Stewart; Deighan et al

Conference (2017, August 09)

NASA’s MAVEN spacecraft has taken more than two earth years (one Martian year) of observations of Mars to understand the process of Martian atmospheric evolution. The Imaging Ultraviolet Spectrograph ... [more ▼]

NASA’s MAVEN spacecraft has taken more than two earth years (one Martian year) of observations of Mars to understand the process of Martian atmospheric evolution. The Imaging Ultraviolet Spectrograph (IUVS) on board MAVEN observes Mars in far and mid ultraviolet (110-340 nm) with unique scanning and pointing capabilities, which are optimized for airglow studies. Dayglow emissions observed on Mars are a perfect tracer for the processes occurring in the emitting region of the atmosphere (100-200 km) and provide basic information about atmospheric composition (and its structure), and give insight into the dynamics, energetics, and physics and chemistry of the thermosphere. With its wide spatial and temporal coverage, IUVS observations of Martian dayglow has contributed immensely to our understanding of the Martian upper atmosphere and its response to incoming solar flux (EUV/FUV) and coupling between lower and upper atmosphere through tides and waves. In this presentation, I will talk about an overview of scientific results obtained by IUVS dayglow measurements, including (1) spatial/temporal distribution of major MUV and FUV emissions and their seasonal variability; (2) the seasonal variation of thermosphere temperatures inferred from dayglow measurements; (3) the effect of solar EUV flux (including the ~27-day solar rotation) and heliocentric distance on upper atmosphere temperature structure. We will present an overview of these results and a discussion of their implications for the state of the Martian upper atmosphere. [less ▲]

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See detailHydrogen Loss from Mars: Seasonal and Sourced from Upper Atmospheric Water
Chaffin; Deighan; Stewart et al

Conference (2017, August 09)

Mars has lost a significant fraction of its initial water inventory to space over its history. This loss proceeds via a chemical chain initiated in the lower and middle atmosphere below 100 km altitude ... [more ▼]

Mars has lost a significant fraction of its initial water inventory to space over its history. This loss proceeds via a chemical chain initiated in the lower and middle atmosphere below 100 km altitude, which results in H escape to space in the collisionless corona above about 200 km altitude. Hydrogen loss from Mars is tracked via brigtness measurements of this corona in Lyman alpha light at 121.6 nm, which is scattered by neutral H orbiting and escaping the planet. Here we present observations of H escape variability made by the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission's Imaging Ultraviolet Spectrograph (IUVS) that demonstrate the seasonal dependence of H escape, adding to evidence initially gathered by Mars Express and the Hubble Space Telescope. We show that for two Mars years the atmosphere has exhibited enhanced H escape in Southern Summer near perihelion. We also present the result of photochemical model calculations which demonstrate that this variation can be explained as a result of high concentrations of water vapor in the upper atmosphere, consistent with Mars Express solar occultation measurements and several general circulation models. Our results demonstrate that the large variations in H escape at high altitudes can be driven by lower atmospheric dynamics, suggesting that Mars hydrogen escape may depend on climate, in addition to the long-term evolution of Martian climate depending on atmospheric escape. [less ▲]

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See detailScience Highlights from MAVEN/IUVS After Two Years in Mars Orbit
Jain; Schneider; Stiepen, Arnaud ULiege et al

Conference (2017, August 08)

The Mars Atmosphere and Volatile EvolutioN (MAVEN) mission's Imaging Ultraviolet Spectrograph (IUVS) observes Mars in the far and mid ultraviolet (110-340 nm), investigating lower and upper atmospheric ... [more ▼]

The Mars Atmosphere and Volatile EvolutioN (MAVEN) mission's Imaging Ultraviolet Spectrograph (IUVS) observes Mars in the far and mid ultraviolet (110-340 nm), investigating lower and upper atmospheric structure and indirectly probing neutral atmospheric escape. The instrument is among the most powerful spectrographs sent to another planet, with several key capabilities: separate Far-UV & Mid-UV channels for stray light control; a high-resolution echelle mode to resolve deuterium and hydrogen emission; internal instrument pointing and scanning capabilities to allow complete mapping and nearly continuous operation; and optimization for airglow studies. After two Earth years in orbit (one Mars year), IUVS has assembled a large quantity of data and provided insights on present-day processes at Mars including dayglow, nightglow, aurora, meteor showers, clouds, and solar-planetary interactions. In this presentation, we will highlight several new discoveries made by IUVS. Among the key results obtained by IUVS are: (1) discovery of the widespread occurrence of a diffuse proton aurora representing a previously unknown source of energy deposition into the atmospheres of unmagnetized planets; (2) first spatial mapping of nitric oxide nightglow reveals regions of atmospheric downwelling necessitating substantial changes to global atmospheric circulation models; (3) a new high-spatial-resolution UV imaging mode allows detection of clouds from nadir to limb and their local time evolution, as well as unprecedented determinations of Mars’ low-altitude ozone; (4) discovery of a persistent meteoric metal layer in Martian atmosphere; (5) atmospheric structure, composition and dynamics from stellar occultation. We will present an overview of these results and a discussion of their implications for characterizing the state of the atmosphere and its evolution. [less ▲]

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See detailMAVEN/IUVS Observations of the Reflectance Spectrum of Phobos
Chaffin; Deighan; Schneider et al

Conference (2017, August 08)

The Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft occasionally has close encounter seasons with Phobos as a consequence of its orbital precession and its apoapsis being near the orbit of the ... [more ▼]

The Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft occasionally has close encounter seasons with Phobos as a consequence of its orbital precession and its apoapsis being near the orbit of the moon. During one encounter season in late 2015, MAVEN's Imaging Ultraviolet Spectrograph (IUVS) was able to gather the first ever spectral images of the moon in the mid-ultraviolet. During these flybys, IUVS was able to observe the trailing hemisphere of the moon, producing spectra useful for comparison with the Mariner 9 Ultraviolet Spectrometer measurements, which observed only the moon's leading side. The IUVS data reveal that the trailing side of the Moon is bluer than the leading side, indicating possible differences in the weathering history of the hemispheres. In addition, we see some evidence for an absorption feature longward of 300 nm, potentially produced by organic compounds, in accordance with Mariner 9 and SPICAM/UV observations. We will present an overview of our images and spectra and a discussion of their interpretation for the history and formation of Phobos. [less ▲]

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See detailImpact of canopy aerodynamic distance spatial and temporal variability on long term eddy covariance measurements
Hurdebise, Quentin ULiege; Heinesch, Bernard ULiege; De Ligne, Anne ULiege et al

in Agricultural and Forest Meteorology (2017), 247(2017), 131-138

Understanding if and how the spatial and temporal variability of the surrounding environment affects turbulence is essential for long-term eddy covariance measurements. It requires characterizing the ... [more ▼]

Understanding if and how the spatial and temporal variability of the surrounding environment affects turbulence is essential for long-term eddy covariance measurements. It requires characterizing the surrounding environment. One way to achieve this is to analyse the canopy aerodynamic distance (Δ), which is the difference between measurement height (zm) and displacement height (d). In this work, an original method to estimate the canopy aerodynamic distance at a fine spatial (30° sectors) and temporal (one year) resolution was proposed. It was based on sensible heat cospectra analysis, calibrated on a measurement height change and validated using canopy height inventories. This method was applied to 20 years of eddy covariance measurements from the Vielsalm Terrestrial Observatory (VTO), a site located in a mixed temperate forest. The method allowed Δ spatio-temporal variability due to changes in canopy or measurement height to be detected. Relationships between Δ and turbulence statistics were then analysed: the momentum correlation coefficient (ruw) was found to be dependent on Δ, confirming that the measurements were made in the roughness sublayer of the atmospheric surface layer. In contrast, no such relationship was found sensible heat, CO2 or water vapour correlation coefficients, suggesting that the Δ variability did not affect significantly these fluxes. There were significant differences, however, between azimuthal directions, suggesting that these scalars were affected by forest heterogeneity in a different way. Various hypotheses were put forward to explain the differences and their relevance was evaluated. This study highlighted the need to consider the spatial and temporal variability of the surrounding environment in order to verify the consistency of long-term eddy covariance datasets. [less ▲]

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See detailPRESSE: "Retirees leaving sociable workplaces may experience accelerated cognitive decline"
Grotz, Catherine ULiege

in BGS (Ed.) British Geriatrics Society: Improving Health Care for older people (2017)

Detailed reference viewed: 21 (0 ULiège)
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See detailMild synthesis of poly(HEMA)-networks as well-defined nanoparticles in supercritical carbon dioxide
Parilti, Rahmet ULiege; Alaimo, David; Grignard, Bruno ULiege et al

in Journal of Materials Chemistry B (2017), 5(29), 5806-5815

Free-radical dispersion polymerisation of 2-hydroxyethyl methacrylate was carried out in supercritical carbon dioxide (scCO2) in the presence of stabilisers based on polyethylene oxide (PEO) and poly ... [more ▼]

Free-radical dispersion polymerisation of 2-hydroxyethyl methacrylate was carried out in supercritical carbon dioxide (scCO2) in the presence of stabilisers based on polyethylene oxide (PEO) and poly(heptadecafluorodecyl acrylate) (PFDA). Different architectures of copolymers (random, palm-tree and diblock) were tested for their surface tension, cloud point and as a stabilising agent. The diblock architecture was found to be the best candidate resulting in poly(HEMA) spherical particles with a size of 316 nm. Furthermore, the effect of the CO2-phobic block (PEO) in the diblock architecture was investigated by using three different chain lengths (1000, 2000, 5000 g mol−1). By optimizing the stabiliser composition and structure, mild reaction conditions have been identified allowing us to obtain well-defined spherical cross-linked poly(HEMA) particles with a mean diameter of unprecedented low size (216 nm) at a temperature as low as 35 °C. [less ▲]

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See detailOviposition deterrent activity of basil plants and their essentials oils against Tuta absoluta (Lepidoptera: Gelechiidae)
Yarou, Boni Barthélémy ULiege; Bawin, Thomas; Boullis, Antoine ULiege et al

in Environmental Science and Pollution Research (2017)

The leafminer Tuta absoluta Meyrick (Lepidoptera: Gelechiidae) is one of the most important pests of tomato, reducing crop yields by up to 100% in greenhouses and fields, in several countries globally ... [more ▼]

The leafminer Tuta absoluta Meyrick (Lepidoptera: Gelechiidae) is one of the most important pests of tomato, reducing crop yields by up to 100% in greenhouses and fields, in several countries globally. Because synthetic insecticides lead to resistance and have adverse effects on natural enemies and the health of producers, alternative control methods are needed. In this study, we assessed the oviposition-deterring effect of basil plants, Ocimum gratissimum L. and O. basilicum L. (Lamiaceae), using dual-choice behavioural assays performed in flight tunnels. We found that both plants significantly reduced T. absoluta oviposition behaviour on a tomato plant located nearby. To evaluate the potential effect of basil volatile organic compounds, we formulated essential oils of both plant species in paraffin oil, and observed a similar oviposition-deterring effect. Gas chromatography analyses detected 18 constituents in these essential oils which the major constituents included thymol (33.3%), p-cymene (20.4%), γ-terpinene (16.9%), myrcene (3.9%) in O. gratissimum and estragol (73.8%), linalool (8.6%), β-elemene (2.9%) and E-β-ocimene (2.6%) in O. basilicum. Twenty and 33 compounds were identified of the volatiles collected on O. gratissimum and O. basilicum plants, respectively. The main components include the following: p-cymene (33.5%), γ-terpinene (23.6%), α-terpinene (7.2%), α-thujene (6.7%) and E-α-bergamotene (38.9%) in O. gratissimum, and methyl eugenol (26.1%), E-β-ocimene (17.7%), and linalool (9.4%) in O. basilicum. Four compounds (α-pinene, β-pinene, Myrcene, Limonene) were common in essential oils and plants. Our results suggest the valuable potential of basil and associated essential oils as a component of integrated management strategies against the tomato leafminer. [less ▲]

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See detailEt si on se passait (complètement) des sciences humaines ?
Winand, Jean ULiege

Conference (2017, August 06)

Detailed reference viewed: 99 (3 ULiège)
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See detailOne-Tooth One-Time (1T1T): a straightforward approach to replace missing teeth in the posterior region
Lambert, France ULiege; Mainjot, Amélie ULiege

in Journal of Oral Implantology (The) (2017)

Advances in Computer-Aided Design and Manufacturing (CAD-CAM) composite materials and chair-side CAD-CAM systems offer a new landscape for the implant dentistry. Digital workflows are increasingly used ... [more ▼]

Advances in Computer-Aided Design and Manufacturing (CAD-CAM) composite materials and chair-side CAD-CAM systems offer a new landscape for the implant dentistry. Digital workflows are increasingly used, especially for single-unit restorations, and they allow straightforward and cost-effective protocols that improve patient satisfaction. The efficacy of immediate loading on single implants has been demonstrated (1, 2). Currently, to 12 promote osseointegration, the use of resin-based provisional crowns out of occlusion is recommended for immediate loading. Such protocols require several appointments and a significant contribution of the dentist and the lab technician, which affects overall treatment cost. On the other hand, CAD-CAM composites, especially Polymer-Infiltrated Ceramic Network (PICN), are now competing with ceramics for definitive single-unit restorations, notably due to their better machinability (faster and in lower-thickness milling, with les edge chipping) (3) (4), the absence of post-milling firing and the ease of in-mouth adjustments. In particular, their higher resilience and lower elasticity modulus could indicate them for immediate loading of implants. Intraoral scanning (IOS) of single-unit implants right after surgery and the chair-side manufacturing of a PICN crown would allow delivery of a resilient final tooth on the same day. The aim of these two case reports is to describe, as a technical note, an innovative approach for a straightforward and cost-effective replacement of a single missing tooth in the posterior region, as a proof of concept. [less ▲]

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See detailLos ingrávidos de Valeria Luiselli: entre fantástico y autoficción
Licata, Nicolas ULiege

Conference (2017, August 03)

En 2011, la escritora mexicana Valeria Luiselli publica su primera novela, Los ingrávidos, cuyo título alude al proceso de afantasmamiento de los dos narradores: una narradora notablemente similar a la ... [more ▼]

En 2011, la escritora mexicana Valeria Luiselli publica su primera novela, Los ingrávidos, cuyo título alude al proceso de afantasmamiento de los dos narradores: una narradora notablemente similar a la propia Luiselli y el poeta mexicano Gilberto Owen. Narración en primera persona y parecidos con el autor por un lado, fenómenos indiscutiblemente inverosímiles por otro, el libro reúne todos los ingredientes de lo que el teórico francés Vincent Colonna llamó “autoficción fantástica”. Sin embargo, en una de sus entrevistas, Luiselli declara que “no quería escribir una novela fantástica”, y, más aún, “que [se] moriría si alguien dice que Los ingrávidos es una novela de ese estilo, estaría profundamente indignada” (Barbosa Vera, Scofaulos 2012). Aunque el efecto fantástico no siempre dependa de la intención de un autor, en este caso preciso Valeria Luiselli parece tener razón. De hecho, un examen detenido de la obra revela una antinomia: sin ser fantástica, Los ingrávidos es una autoficción “de ese estilo”. Es sobre esa antinomia que esta comunicación inclina la perspectiva. Después de un sucinto resumen, nos centremos en primer lugar en los indicios autoficcionales de la novela y luego en sus componentes fantásticos, examinando con más detenimiento los que impiden que el libro se adhiera a esa modalidad, a saber, los moduladores de duda, los comentarios metadiegéticos y la no fiabilidad de la narradora. [less ▲]

Detailed reference viewed: 51 (3 ULiège)