HAL-Artois
Not a member yet
27242 research outputs found
Sort by
Análise: os subsídios aos combustíveis fósseis ainda fazem sentido?
No full textInternational audienc
The More, the Merrier? Membership Expansion and Incumbents' Boundary Work Divergence in the Platformization of Belgian Philanthropy
No full textInternational audienceWhen actors emerge on the periphery of a field, incumbents either engage in protective boundary work to enforce the field's membership criteria, or opt for membership expansion by adapting these criteria to accommodate peripheral actors. Less explored is the divergence configuration where a minority of incumbents pursue expansion whereas the majority adopt a protective strategy. Since the inclusion of peripheral actors may challenge membership criteria (i.e., the symbolic boundary) and shift the resource distribution and social hierarchy (i.e., the social boundary), how minority incumbents induce membership expansion against the majority's protective stance is an intriguing question. Drawing on a qualitative field‐level case study of Belgian philanthropy, we examine incumbent foundations' responses to the rise of ‘social‐mission platforms.’ We identify four mechanisms through which minority incumbents can overcome the majority's initial opposition and bring about support to membership expansion: affirming divergent expansive posture, leveraging definitional ambiguity, demonstrating comparative reinforcement, and facilitating shared buy‐in. We further show how each mechanism bridges the social and symbolic boundaries through the combined (re)actions of the diverging incumbents and the peripheral actors. Our findings extend understandings of membership expansion as a contested, multi‐actor process and unpack the interaction of social and symbolic boundaries in shaping field evolution
Mineralogical evidence of acid mine drainage on spoil tips of the Nord Pas-de-Calais coal mining basin (Northern France): A high-resolution characterization of the black shale weathering
No full textInternational audienceThe northern France is renowned for its 200 spoil tips, vestiges of coal mining during the 19th and 20th centuries. These tailings composed of Carboniferous black shales are subject to supergene conditions, leading to weathering and potential release of contaminants into the environment. However, it was long accepted that element release process did not occur in this area, and no acid mine drainage (AMD) was observable at the regional scale. Here, we conducted a detailed characterization of the primary and secondary mineral phases comprising the weathered black shales from three selected vegetated spoil tips. Through a combination of macro, micro, and nanoscale analyses (XRD, SEM, FIB, TEM, STXM-XANES), we reveal that AMD occurs on at least the first 30 cm of the entire vegetated surfaces of the spoil tips. This AMD forms an “alteration front” at the surface of the fragmented shale blocks, consisting of two distinct submicrometric layers: an inner Fe-rich layer composed of iron oxyhydroxides and a few nanometric neoformed smectite or illite/smectite, and an outer S-rich layer, featuring euhedral and anhedral jarosite, with a few rosette-like iron oxyhydroxides. Petrographic and textural signatures suggest that these two layers form independently and successively, by direct precipitation from fluids enriched with K, Fe2+, Fe3+, and S. The 2-layer structure of this alteration front indicates a sharp change in the physico-chemical conditions, in particular a decrease in pH to below 3, during the weathering process. Results also suggest element transfers to the environment; S, Fe and K are released by the shale and fixed at least temporarily at the shale surface, as well as metals and metalloids like As, Sr, Mo and Ge. By highlighting the acidification process, the formation of secondary minerals typical of AMD, and the release of elements from shale, this study sheds light on a long-term process that, although not clearly observable twenty years ago, is now visible at the spoil tips scale and whose consequences could become evident at the landscape scale in the coming decades
Cobald Part A - Exploring Secondary Brand Associations for a Business-to-Business Technology Brand
No full textThe Case Centre, case study 525-0066-1, teaching note 525-0066-8This is part of a case series. David Danes is the founder and CEO of Cobald Group, a business-to-business (B-to-B) technology company headquartered in Brussels (Belgium) operating in web hosting, domain names, and cloud-based solutions. The company reported an all-time high revenue of EUR47.3M and a net profit of EUR11.5M in 2024. However, the business unit of web hosting has seen a decrease by on average 3-4% for the third consecutive year due to increased competition and management's focus on growth markets like cloud-based solutions. A brand audit revealed that brand awareness for the Cobald brand was significantly lower among medium and large business customers, compared to its main competitors. These competitors came on the one hand from global enterprise (web) hosting companies (eg, Amazon, Microsoft) and on the other hand, from managed (web) hosting companies (eg, Squarespace, Wix). Furthermore, the brand audit also revealed that business customers found it difficult to identify unique associations with Cobald. David wants to identify opportunities to strengthen the brand in the context of a limited budget. He needs to diagnose which sources of secondary brand associations he should prioritize and evaluate their fit with the Cobald brand
Novel one-dimensional CuII coordination polymer generated from 2,5-bis(pyridin-2-yl)-1,3,4-oxadiazole as bis-bidentate ligand: Structural characterization, Hirshfeld surface analysis, molecular docking, and in silico ADME studies
No full textInternational audienceThe reaction of 2,5-bis(pyridine-2-yl)-1,3,4-oxadiazole (2-bpo) with copper salt (CuCl2·2H2O) generates a novel copper(II) mono-dimensional coordination polymer, noted [Cu (2-bpo)Cl2]n, which characterized by single crystal X-ray diffraction (SC-XRD), Hirshfeld surface analysis, as well as, FTIR, Raman, and UV–Visible techniques. Crystal data showed that this polymeric complex crystallizes in the monoclinic system with centrosymmetric space group C2/c, with a = 9.7218(9) Å, b = 12.6445(12) Å, c = 11.0047(11) Å, β = 103.146(2)°, and Z = 4. The CuII ion lies on an inversion centre and displays elongated octahedral coordination geometry. The equatorial positions are occupied by the N atoms of two ligands, whereas the axial positions are occupied by the chlorine atoms. The 2-bpo ligand coordinates to CuII ions to form1-D helical chain complex. The cohesion of [Cu(2-bpo)Cl2]n structure is ensured by C–H⋯Cl weak hydrogen bonds and π⋯π interactions between pyridyl and oxadiazole rings forming a three-dimensional structure, as established by Hirshfeld surface analysis. Density Functional Theory (DFT) studies, including FMO, NLO, ELF, NCI, and QTAIM analyses, confirmed the structural stability of the [Cu(2-bpo)Cl2]n complex. Molecular docking revealed significant antidiabetic, anti-inflammatory, anticancer, and antibacterial potential, with the highest affinity observed for antibacterial and antidiabetic activities. ADME analysis indicated favourable pharmacokinetic properties, highlighting the complex's promise for biomedical applications
Mechanochemical Copper-Catalyzed Carboxylation of Terminal Alkynes under Reactive CO<sub>2</sub> Atmosphere
No full textInternational audienc
Introduction to Back-Testing on the Bloomberg Terminal
No full textThe Case Centre, case study 125-0039-1, teaching note 125-0039-8This case study presents a role-play exercise in which students take on the roles of junior traders at Bright Side No Cloud Asset Management, a fictional investment firm that has recently acquired a Bloomberg Terminal for its trading unit. The department supervisor, represented by the instructor, assigns students a task via email: to explore the Bloomberg Terminal, with a particular focus on its back-testing features (BT and BTST functions). Students must design trading strategies of their choice and back-test them on multiple securities. This case is designed to enhance students' problem-solving abilities in a real-world financial setting, with a primary focus on developing proficiency in using the Bloomberg Terminal. Through hands-on experience, students engage with essential financial concepts, refine their analytical skills, and deepen their understanding of trading strategy evaluation
Capturing and labeling CO<sub>2</sub> in a jar: mechanochemical <sup>17</sup>O-enrichment and ssNMR study of sodium and potassium (bi)carbonate salts
No full textInternational audienceWith the rapid increase in temperatures around the planet, the need to develop efficient means to reduce CO2 emissions has become one of the greatest challenges of the scientific community. Many different strategies are being studied worldwide, one of which consists of trapping the gas in porous materials, either for its short-or long-term capture and storage, or its re-use for the production of value-added compounds. Yet, to further the development of such systems, there is a real need to fully understand their structure and properties, including at the molecular-level following the physisorption and/or chemisorption of CO2 (which can lead to various species, including carbonate and bicarbonate ions). In this context, 17O NMR naturally appears as the analytical tool of choice, because of its exquisite sensitivity to probe subtle differences in oxygen bonding environments. To date, it has scarcely been used, due to the very low natural abundance of 17O (0.04%), and the difficulty in purchasing or obtaining commercial 17O-labeled compounds adapted to such investigations (e.g., 17O-CO 2(g) , or 17O-enriched Na-and K-(bi)carbonate salts, which can be readily transformed into CO2). Herein, we demonstrate how, using mechanochemistry, it is possible to enrich with 17O a variety of Na-and K-(bi)carbonate salts in a fast, economical, scalable, and user-friendly way. The high enrichment levels enabled recording the first high-resolution 17O ssNMR spectra of these phases at different temperatures and magnetic fields. From these, the typical spectral signatures of (bi)carbonate ions could be obtained, showing their strong sensitivity to local environments and dynamics. Lastly, we show how thanks to the selective 17O-labeling, other aspects of the reactivity of carbonates in materials can be unveiled using in situ 17O ssNMR. In the long run, it is expected that this work will open the way to more profound investigations of the structure and properties of carbon capture and storage systems, and, more generally speaking, of functional materials containing carbonates
