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See detailTowards a development of iron phosphate-based materials as positive and negative electrodes for Li-ion batteries
Karegeya, Claude ULiege

Doctoral thesis (2017)

The design, synthesis and electrochemical characterization of new electrode materials hold the key for fundamental advances in energy conversion and storage technologies. Polyanionic compounds have been ... [more ▼]

The design, synthesis and electrochemical characterization of new electrode materials hold the key for fundamental advances in energy conversion and storage technologies. Polyanionic compounds have been heavily investigated as possible electrode materials in lithium- and sodium-ion cells. This thesis focused on the design, synthesis, size and morphology tailoring of iron phosphate based electrode materials in order to enhance their electrochemical properties. Four iron phosphate-based electrode materials classified in three groups: Na2Mn1.5Fe1.5(PO4)3, NaxMxFe(3-X)(PO4)3 (X=1.25 when M=Ni and x=1.5 for M= Mn) and Fe1.19(PO4)(OH)0.57(H2O)0.43, were investigated in this work. All these compounds were obtained through wet chemical (hydrothermal or solvothermal) synthesis routes. The preparation protocols and characterization techniques to study the structural, particle size, morphological and electrochemical properties of the above materials have been discussed in the following chapters. Sodium manganese iron phosphate alluaudite structure is one of the studied compounds group. Na2Mn1.5Fe1.5(PO4)3 is obtained via one step hydrothermal synthesis reaction and it was electrochemically studied without any other further heat treatment. NaxMxFe(3-X)(PO4)3 (X=1.25 for M=Ni and x=1.5 for M= Mn) compounds were obtained through solvothermal method in ethylene glycol. Na1.25Ni1.25Fe1.75(PO4)3 is a new material. Both materials have been electrochemically characterized for the first time in this work. Fe1.19(PO4)(OH)0.57(H2O)0.43 was obtained by modifying conventional hydrothermal synthesis of this materials by the addition of conducting carbon (carbon black and carbon nanotubes) in the precursors solution during synthesis that enhance its electrochemical properties as described in this thesis. The Li-ion intercalation reaction mechanisms in Fe1.19(PO4)(OH)0.57(H2O)0.43 cathode material were also investigated by using operando XRD and Mössbauer spectroscopy techniques. The above studies of iron phosphate-based polyanionics as electrode materials in alkali metal-ion batteries show that this group may be the right key in replacing current commercial unsafe electrode materials. The possibility of improving alternative soft chemical synthesis methods to design new materials or improving electrochemical performance of existing electrode materials was also explored here. The roadmap for our current and future work has been proposed, the materials of our future interest have been chosen basing on their promising rich crystal structure and electrochemical properties by comparing them with the studied materials. [less ▲]

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See detailზოგადი პრაქტიკის / საოჯახო მედიცინის ტერმინოლოგია, ვერსია 2.5
Jamoulle, Marc ULiege; Kareli, Ana; Natroshvili, Natia

Textual, factual or bibliographical database (2017)

ზოგადი პრაქტიკის / საოჯახო მედიცინის ტერმინოლოგია, ვერსია 2.5 Q-კოდი ძირითადი არაკლინიკური პრობლემების ტაქსონიმია, რომლებიც ხვდება ზოგადი პრაქტიკის/ოჯახის ექიმის პრაქტიკაში უწყვეტი პროფესიული ... [more ▼]

ზოგადი პრაქტიკის / საოჯახო მედიცინის ტერმინოლოგია, ვერსია 2.5 Q-კოდი ძირითადი არაკლინიკური პრობლემების ტაქსონიმია, რომლებიც ხვდება ზოგადი პრაქტიკის/ოჯახის ექიმის პრაქტიკაში უწყვეტი პროფესიული განვითარებისას Each of the Q-Codes has a definition. The definitions have been carefully selected from online available terminologies, papers or dictionaries available in the book. The below list is extracted from the HeTOP server www.hetop/Q . Each definition is followed by its source between brackets and by the corresponding Q-Codes. The file with the sources of the definition is available on www.3cgp.docpatient.net [less ▲]

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See detailMOOC et classes inversées ou cours magistraux. Données générales .
Hanzen, Christian ULiege

Scientific conference (2017, November 11)

Cette conférence avait pour objectif de conscientiser des enseignants universitaires aux potentialités offertes par les MOOC et la classe inversée pour favoriser l'apprentissage des apprenants.

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See detailStrongly interacting dark matter doesn't explain the DAMA signal
Laletin, Maxim ULiege

Scientific conference (2017, November 10)

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See detailCharles de Méan, le Papinien liégeois
Lagasse, Benoît ULiege

Doctoral thesis (2017)

La thèse tend à déterminer si Charles de Méan, surnommé le Papinien liégeois, mérite ce surnom signifiant qu'il a été le plus grand jurisconsulte qu'ait connu la principauté de Liège. Pour ce faire, elle ... [more ▼]

La thèse tend à déterminer si Charles de Méan, surnommé le Papinien liégeois, mérite ce surnom signifiant qu'il a été le plus grand jurisconsulte qu'ait connu la principauté de Liège. Pour ce faire, elle tend à étudier une partie de son oeuvre majeure, les Observationes et res judicatae ad jus civile Leodiensium, Romanorum, aliarumque gentium canonicum et feudale. Par ailleurs, la thèse met en exergue la spécificité du droit liégeois et tend à déterminer les influcences subies par ce droit. [less ▲]

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See detailLe jeu vidéo : pas si méchant. Des stéréotypes à la réalité
Krywicki, Boris ULiege

Conference given outside the academic context (2017)

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See detailDesign of a hydraulic nozzle with a narrow droplet size distribution
De Cock, Nicolas ULiege

Doctoral thesis (2017)

Nowadays, pesticides use is necessary to satisfy the growing demand for agricultural products. During pesticide spray application, the agricultural mixture containing the active ingredient is fragmented ... [more ▼]

Nowadays, pesticides use is necessary to satisfy the growing demand for agricultural products. During pesticide spray application, the agricultural mixture containing the active ingredient is fragmented to a cloud of droplets of various sizes and speeds. The droplet size distribution within the spray affects the efficiency of the treatment. According to the target, a specific droplet size should be used. However, hydraulic nozzles usually used in field application produce sprays with a wide droplet size distribution containing an important proportion of small or too large droplets. This results in non-optimal application and therefore losses of product into the environment. This statement conducted the research as early as in the 60’s to create the rotary atomizer. This device is able to produce narrow droplet size distribution using Plateau-Rayleigh break up mechanism. The characteristics of the produced spray by the rotary atomiser can be tuned by adjusting the rotational speed and the volumetric flow rate. Although offering agronomic and environmental qualities this has not met success for the application of plant protection products in field crops because of their cost, size and complexity. The aim of the thesis was the design of a hydraulic nozzle with the rotary atomizer qualities and without the constraints of rotating parts. Unlike the rotary atomizer which has two control variables, the developed hydraulic nozzle will have a narrower operating range, thus a specific geometry has to be design for each kind of treatment. The new hydraulic nozzle design is composed by an inlet pipe ending perpendiculary on a plate. There is a thin opening at the junction between the pipe and the plate. The edge of the plate is constituted of channels formed by structures. These channels aim to divide the liquid sheet in multiple jets. The breakup of these jets into droplets generate a narrow droplet size distribution. The thesis can been seen as a roadmap providing design tools at each step starting from the determination of an optimal droplet size according to the kind of treatment and ending with a nozzle geometry. The prediction of the optimal droplet size according to the treatment was done using integrated modelling approach of the spray transport and retention by the plant. As each spray requires a specific nozzle geometry, an analytical model of the flow on the nozzle was developed. This model allows the determination of geometry according to the desired spray. Finally, a prototype of nozzle has been built. The measurement of the spray characteristics of the prototype was realized using a developed high-speed imaging technique providing the droplet size and speed. The prototype showed results in term of narrowing of the droplet size distribution. [less ▲]

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See detailImpacts de contaminations sur la végétation et la faune du sol
Liénard, Amandine ULiege

Conference given outside the academic context (2017)

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Peer Reviewed
See detailFrom Gasoline Alley to Walt & Skeezix. Layers of Autobiography in Frank King's Comic Strip Reprints
Crucifix, Benoît ULiege

Conference (2017, November 09)

This paper focuses on Jeet Heer and Chris Ware’s D+Q reprints of Frank King’s original 1920s-1930s newspaper comic strip, suggesting that the paratext of these 21st-century editions provide an ... [more ▼]

This paper focuses on Jeet Heer and Chris Ware’s D+Q reprints of Frank King’s original 1920s-1930s newspaper comic strip, suggesting that the paratext of these 21st-century editions provide an “autobiographical reading” of the comic strip. Heer and Ware thus participate in the retrospective integration of Frank King’s comic strip within the autobiographical paradigm dominating the graphic novel. In doing so, the reprints acknowledge how King adapted to the cultural and commercial constraints of the newspaper strip to produce an indirect form of life-writing. [less ▲]

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Peer Reviewed
See detailChina’s new relations with Panama and Costa Rica are another step towards a Beijing Consensus in Central America
Wintgens, Sophie ULiege

in LSE Latin America and the Caribbean (2017)

Increased trade, aid, investment, and diplomatic engagement between China and both Costa Rica and Panama signal a more general projection of Chinese economic and political standards in international trade ... [more ▼]

Increased trade, aid, investment, and diplomatic engagement between China and both Costa Rica and Panama signal a more general projection of Chinese economic and political standards in international trade policy. [less ▲]

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See detailMémoires déclinées
Grandjean, Geoffrey ULiege; Henrard, Gaëlle

Conference given outside the academic context (2017)

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See detailQuelle politique agricole commune aujourd'hui?
Habran, Maxime ULiege

Conference given outside the academic context (2017)

Bilan de l'évolution de la politique agricole commune

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See detailLes arbres, ces natures sensibles : Oui, les plantes se parlent
Fauconnier, Marie-Laure ULiege

Article for general public (2017)

Marie-Laure Fauconnier, professeur ordinaire à Gembloux Agro-Bio Tech, ULg. Chimiste, elle mène des recherches dans le domaine des molécules naturelles volatiles émises par le règne végétal.

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See detailTime to make a choice between a fully liberal or fully regulated model for the electrical industry
Ernst, Damien ULiege

Conference given outside the academic context (2017)

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See detailLe métier d'enseignant : de plus en plus pénible ?
Lafontaine, Dominique ULiege; Quittre, Valérie ULiege

Conference given outside the academic context (2017)

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See detailEcophysiology of elephants to better understand their crop selection: first results of a case study in Monts de Cristal, Gabon
Ngama, Steeve ULiege

Conference (2017, November 07)

Parasites and hormones are one of the best indicators of animal ecophysiology which clarify the role and importance of physiological processes in the ecological relations of species in their natural ... [more ▼]

Parasites and hormones are one of the best indicators of animal ecophysiology which clarify the role and importance of physiological processes in the ecological relations of species in their natural habitat. As damages on crops are often sources of conflict between humans and elephants in elephant home ranges, few data on the relevance of elephant physiology on crop selection exist. For that we investigate elephant ecophysiology to better understand if their parasitism and stress conditions underlie their crops selection. For that we measured parasite loads and stress hormone levels in feces of some elephants eating banana and others eating natural food. We conducted the study during fifteen months covering five different local seasons of the research site in Mont de Cristal, Gabon. Here we report first results from two seasons. We collected 485 samples of elephant dungs and more than 1200 samples of food items eaten by elephants. While stress levels are not correlated to banana selection, the presence of parasites is. Our results show higher parasite loads in dungs of elephants eating banana than in those of elephants eating natural food resources species. Thus elephants may eat banana more as a medicine item than a food resource. But we still need to confirm these results by assessing this trend over seasons and with reproduction hormones. [less ▲]

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Peer Reviewed
See detailGreenland Ice Sheet Surface Mass Loss: Recent Developments in Observation and Modeling
van den Broeke, M.; Box, J.; Fettweis, Xavier ULiege et al

in Current Climate Change Reports (2017)

Surface processes currently dominate Greenland ice sheet (GrIS) mass loss. We review recent developments in the observation and modeling of GrIS surface mass balance (SMB), published after the July 2012 ... [more ▼]

Surface processes currently dominate Greenland ice sheet (GrIS) mass loss. We review recent developments in the observation and modeling of GrIS surface mass balance (SMB), published after the July 2012 deadline for the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC AR5). Since IPCC AR5, our understanding of GrIS SMB has further improved, but new observational and model studies have also revealed that temporal and spatial variability of many processes are still poorly quantified and understood, e.g., bio-albedo, the formation of ice lenses and their impact on lateral meltwater transport, heterogeneous vertical meltwater transport (‘piping’), the impact of atmospheric-circulation changes and mixed-phase clouds on the surface energy balance, and the magnitude of turbulent heat exchange over rough ice surfaces. As a result, these processes are only schematically or not at all included in models that are currently used to assess and predict future GrIS surface mass loss. [less ▲]

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See detailDevelopment of an Interferometric Mass Processing Chain for Multitemporal Ground Deformation Measurements
Libert, Ludivine ULiege; De Rauw, Dominique ULiege; d'Oreye, Nicolas

Conference (2017, November 07)

The main goal of the RESIST project is to understand the mechanisms driving volcanic eruptions and landslides in the Kivu region, on the East African Rift. In order to model both volcanic and landslide ... [more ▼]

The main goal of the RESIST project is to understand the mechanisms driving volcanic eruptions and landslides in the Kivu region, on the East African Rift. In order to model both volcanic and landslide processes, it is necessary to measure ground deformations in the region accurately. For this purpose, both ground-based instruments (e.g. GPS network) and spaceborne data (e.g. optical and SAR images) are used. One aspect of the project focuses on Differential SAR Interferometry (DInSAR), which is a technique used to map ground deformations occurring between two SAR images acquired at different times. It is today a well-mastered technique that offers large spatial coverage with a typical temporal sampling of one to several days, depending on the chosen sensor. In the last years, multitemporal approaches based on DInSAR have been developed, like the Small BAseline Subset (SBAS) [1] and Multidimensional Small BAseline Subset (MSBAS) [2] techniques, or the Persistent Scatterers Interferometry (PSI) [3]. In the framework of RESIST, we use MSBAS to perform ground deformations monitoring along time. The Multidimensional Small BAseline Subset (MSBAS) technique produces 2-D time series of ground deformations by integrating data sets of SAR images acquired by different sensors, with different spatial and temporal sampling, resolutions, incidence angles, wavelengths, pass directions and other varying parameters. By combining at least two data sets with overlapping spatial and temporal coverage and an extended range of look angles, the evolution of deformations in the vertical and west-east directions can be computed by the MSBAS approach [2]. The MSBAS software feeds on a large amount of deformation maps, which are produce by DInSAR. Such an amount of data cannot be produced by hand and that is the reason why we developed an automatic interferometric processing chain meant to produce large amounts of products adequate for multitemporal methods like MSBAS. The interferometric processing is supported by the CSL InSAR Suite (CIS) software developed at Centre Spatial de Liège, which presents the advantages to be fully adaptable to the needs of the MSBAS technique and the thematic specificities. Indeed, numerous options (e.g. adaptive filtering, wide swath interferometry) have been added to the CIS software in the framework of the RESIST project. In a first time, we will briefly present the MSBAS approach and its advantages regarding the ground deformation measurements. In the second part of the presentation, we will introduce the mass processing chain step by step and its functionalities. Critical steps of the chain, like the chosen strategy for the interferometric pairs selection, the integration of Sentinel-1 data or the image interpolation approach, will be presented in more details. Finally, preliminary results of an MSBAS processing over the Bukavu area will be presented. REFERENCES: [1] Berardino, P., Fornaro, G., Lanari, R., and Sansosti, E. (2002). A new algorithm for surface deformation monitoring based on small baseline differential SAR interferograms, IEEE Trans. Geosci. Remote Sens., 40, 11, pp. 2375-2383. doi: 10.1109/TGRS.2002.803792. [2] Samsonov, S., and d’Oreye, N. (2012). Multidimensional time series analysis of ground deformation from multiple InSAR data sets applied to Virunga Volcanic Province, Geophysical Journal International, 191, 3, pp. 1095-1108. doi: 10.1111/j.1365-246X.2012.05669.x [3] Ferretti, A., Prati, C., and Rocca, F. (2001). Permanent scatterers in SAR interferometry, IEEE Trans. Geosci. Remote Sens., 39, 1, pp. 8-20. doi: 10.1109/36.898661. [less ▲]

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See detailAura-t-on toujours besoin de chômeurs en 2030 ?
Orianne, Jean-François ULiege

Scientific conference (2017, November 07)

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