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showing 10 items of 11436 documents
La métallurgie du fer au Sahel : Répartition spatiale de bas fourneaux au Sud-Ouest du Niger. Premiers résultats
2010
International audience; A 15 km à l'Est de Niamey (Sud-Ouest du Niger), une prospection pédestre exhaustive a permis de dénombrer plus de 4000 bas-fourneaux sur un bassin versant de 24 km². Ils sont identifiables par la présence de scories correspondant aux résidus de réduction du fer. Ce grand nombre de structures de réduction est lié au fonctionnement à usage unique des bas-fourneaux, qui est peu étudié dans la région ouest africaine. Les premières études de répartition spatiale montrent que l'implantation de ces bas-fourneaux est principalement soumise à la géomorphologie. Les forgerons ont installé leurs sites de réduction à proximité des talus de plateaux où affleure le minerai de fer …
Organizāciju "Raunas Dārzs" un "Fat Cat" mārketinga komunikācijas analīze sociālajos medijos "Facebook" un "Instagram"
2018
Bakalaura darba “Organizāciju “Raunas Dārzs” un “Fat Cat” mārketinga komunikācijas analīze sociālajos medijos “Facebook” un “Instagram”” mērķis ir izpētīt un izanalizēt organizāciju mārketinga komunikāciju sociālajos medijos “Facebook” un “Instagram”, salīdzināt un novērtēt organizāciju veikumus, kā arī izstrādāt ieteikumus citām organizācijām. Teorijas daļā tiek aplūkota kas ir organizācijas, mārketinga būtība un komunikācija, sociālie mediji un to veidi, detalizētāk iepriekš minētie sociālie tīkli, sociālo mediju mārketings, kā arī patērētāju uzvedība. Pētījumā iegūtie rezultāti liecina, ka sociālie mediji var kalpot kā vienīgais kanāls mārketinga komunikācijas nolūkos, jo to funkcijas un…
"Facebook" komunikācija kā mārketinga instruments jaunu klientu piesaistei: "MyFitness" un "Lemon Gym" gadījums
2019
Bakalaura darba nosaukums ir ““Facebook” komunikācija kā mārketinga instruments jaunu klientu piesaistei: “MyFitness” un “Lemon Gym” gadījums”. Darbs ir izstrādāts ar mērķi apskatīt, analizēt un salīdzināt sporta klubu “MyFitness” un “Lemon Gym” komunikāciju sociālajā tīklā “Facebook”. Darba teorētiskajā daļā ir apkopota teorija par mārketinga komunikāciju, sociālajiem medijiem un sociālo tīklu “Facebook”, savukārt metodoloģiskajā daļā ir apskatītas darbā izmantotās pētnieciskās metodes – kontentanalīze, daļēji strukturēta intervija un aptauja. Rezultātos ir aprakstīti pētījumā iegūtie dati un darba beigās ir izdarīti secinājumi. Secinājumos ir atklātas abu sporta klubu mārketinga principu …
Compliance and resistance : An investigation into the construction of gender identities by Pakistani women on Facebook
2020
Facebook has recently gained popularity among young, digitally literate and predominantly urban Pakistanis. Such social networking sites allow users the freedom to express themselves using usernames, visuals and topics of their own choice. In this article, I examine how Pakistani Facebook users mobilize such resources in their identity work. Using Multimodal Discourse Analysis, I investigate how Pakistani women construct their gender identities on Facebook using visual and linguistic resources. The results revealed the significant impact of Facebook on the socio-cultural and linguistic norms of discourse in Pakistan that enables women to challenge established communication models while they…
Female unemployment in an emerging economy : A study of online social support as a coping strategy
2021
The increased use of social media has resulted in active participation of women on social media platforms, specifically Facebook, Twitter, and Instagram. However, very little research has been carried out, specifically, on how women cope with the challenges of unemployment using social media networks. Thus, many women resort to different means as a coping strategy during their unemployment. In the face of rapid diffusion of social platforms, it is unclear how women personality traits influence their use of the social media. Similarly, it is also unclear how women’s experiences with these social networks, as a medium of online social support, serve as a coping strategy in the period of unemp…
Women’s Multifaceted Citizenship : Identity, Belonging and Spaces of Participation in Rural Uganda
2022
This article analyses manifestations of women’s citizenship in diverse spaces of everyday participation in the rural districts of Kiboga and Namutumba in Uganda. Building on citizenship studies scholarship, we propose the notion of multifaceted citizenship, which ‘takes place’ in the same spaces of participation as processes of identity formation and belonging. Thus, our article also explores how identities and belonging manifest in spaces of participation. Drawing on content analysis of 50 qualitative interviews, we begin by investigating the spaces of participation that are experienced as meaningful by women. We then classify identities into five main categories: active resident, member, …
Hyaluronan‐coated poly(propylene imine) dendrimers as biomimetic nanocarriers of doxorubicin
2022
A coating technology based on low molecular weight hyaluronic acid (HA) and ferulic acid (FA) was applied to the coating of low generation poly(propylene imine) dendrimers through a biocompatible hexa(ethylene glycol) spacer. The ensuing HA-FA-HEG-PPID dendrimeric materials showed interesting loading capability (between 7.65% and 9.08%) regarding anticancer agent doxorubicin, and their interactions with the drug appeared to hamper the drug release in the physiological environment. Thus, the stable nanostructured loaded delivery systems were able to internalize into cells expressing the HA receptor CD44 and to demonstrate high cytotoxicity comparable to that shown by equivalent amounts of fr…
Review on the Processing and Properties of Polymer Nanocomposites and Nanocoatings and Their Applications in the Packaging, Automotive and Solar Ener…
2017
For the last decades, nanocomposites materials have been widely studied in the scientific literature as they provide substantial properties enhancements, even at low nanoparticles content. Their performance depends on a number of parameters but the nanoparticles dispersion and distribution state remains the key challenge in order to obtain the full nanocomposites’ potential in terms of, e.g., flame retardance, mechanical, barrier and thermal properties, etc., that would allow extending their use in the industry. While the amount of existing research and indeed review papers regarding the formulation of nanocomposites is already significant, after listing the most common applications, this r…
Supramolecular Modification of ABC Triblock Terpolymers in Confinement Assembly
2018
The self-assembly of AB diblock copolymers in three-dimensional (3D) soft confinement of nanoemulsions has recently become an attractive bottom up route to prepare colloids with controlled inner morphologies. In that regard, ABC triblock terpolymers show a more complex morphological behavior and could thus give access to extensive libraries of multicompartment microparticles. However, knowledge about their self-assembly in confinement is very limited thus far. Here, we investigated the confinement assembly of polystyrene-block-poly(4-vinylpyridine)-block-poly(tert-butyl methacrylate) (PS-b-P4VP-b-PT or SVT) triblock terpolymers in nanoemulsion droplets. Depending on the block weight fractio…
Bright Visible Luminescence in Silica Nanoparticles
2011
International audience; We demonstrate that a porous film of silica nanoparticles emits a bright visible luminescence associated with defects stabilized by oxygen chemisorption at oxygen deficient center sites. Time-resolved spectra excited by a tunable laser allow us to distinguish the luminescence at 1.99 eV, characteristic of the nonbridging oxygen hole center (NBOHC) (Si-O)3 Si-O*, and a fast and a slow emission: the first (lifetime τ ≈ 25 ns) is peaked at 2.27 eV with an excitation spectrum centered at 5.5 eV; the second (τ ≈ 7.5 μs) is peaked at 2.41 eV and is excited around 3.2 and 5.2 eV. Reaction in an air atmosphere leads to the disappearance of the NBOHC luminescence and of the …