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Letteratura scientifica selezionata sul tema "Surfaces actives"

Autore: Grafiati

Pubblicato: 25 gennaio 2025

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Articoli di riviste sul tema "Surfaces actives"

Costa, Alexandre Magno Megale, Elizabeth Ferreira Martinez, Ana Paula Dias Demasi e Vera Cavalcanti de Araújo. "INFLUENCE OF DIFFERENT TITANIUM SURFACE TREATMENTS ON THE BIOLOGICAL BEHAVIOR OF OSTEOBLASTIC CELLS". Centro de Pesquisas Avançadas em Qualidade de Vida 16, V16N2 (2024): 1. http://dx.doi.org/10.36692/v16n2-44.

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Introduction: Different methods of treatment to dental titanium surfaces have been adopted to improve mechanical and chemical properties of the implant and to improve osseous integration. Objective:The objective of the present work was to compare the performance of three titanium surfaces, Porous® (obtained by double acid treatment), Vulcano Actives® (obtained by anodization), and PorousNano® (obtained by double acid treatment and fluoride incorporation) in regards to cell proliferation of osteoblast precursors and gene expression of extracellular matrix proteins type 1 collagen, osteocalcin, osteopontin and ostenectin. Materials and Methods: We utilized commercially pure grade 4 titanium discs to cultivate osteoblastic precursor cell line MC3T3-E1 (ATCC - USA). After 3, 7 and 10 days, we performed cell proliferation assay using Trypan blue exclusion testand gene expression analysis by Real-Time PCR. Results and Conclusion: Results were recorded and analyzed statistically using a level of significance of P<0.05. We observed higher cell proliferation and higher gene expression of proteins linked to synthesis and mineralization of the extracellular matrix on the Vulcano Actives® surface.

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Popa, Camelia Lǎcrǎmioara. "Graphical Method in CAD Environment for Profiling End Mill Tool". Applied Mechanics and Materials 809-810 (novembre 2015): 787–92. http://dx.doi.org/10.4028/www.scientific.net/amm.809-810.787.

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The actives surfaces of screw compressors are helical surfaces, cylindrical and uniform pitch. The generation of helical surfaces can be done using tools bordered by revolution surfaces (as end mill cutter, or disk cutter). The shaping of generating tools is based on fundamentals theorem of the enveloping surfaces. This paper consists to propose a graphic solution, using specific tools of the design environment AUTOCAD, to problem concerning the shaping end mill tool which generates the helical flute of male rotor component of screw compressor. The algorithm has been developed based on a complementary theorem - "The theorem of substituting circles family".

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Djagni, Kokou K., e Michel Fok. "Dangers potentiels de l’utilisation des insecticides dans la culture cotonnière au Togo de 1990 à 2010". Cahiers Agricultures 28 (2019): 23. http://dx.doi.org/10.1051/cagri/2019023.

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Dans la perception des profanes, le coton est encore considéré comme la culture consommant le plus d’insecticides néfastes pour la santé et l’environnement. Une telle mauvaise image n’est plus justifiée selon une étude internationale de l’Expert panel on Social, environmental and Economic Performance of cotton production (SEEP), mais les pays producteurs ont peu analysé et informé sur l’évolution de l’utilisation des insecticides. L’article comble cette lacune dans le cas du Togo. Il concerne une étude basée sur la reconstitution des séries de données des surfaces emblavées et d’insecticides distribués aux producteurs de coton de 1990 à 2010. Les données sur les insecticides portent sur les volumes distribués et leur composition en matières actives pour déduire la consommation de matières actives par hectare. En s’inspirant de l’étude internationale mentionnée qui avait compilé les indices d’écotoxicité des matières actives, les charges toxicologiques vis-à-vis de plusieurs organismes ont été calculées pour cerner les dangers potentiels liés aux insecticides utilisés. Ces charges ont été définies pour permettre de cerner l’évolution dans le temps ou de comparer les pays. La consommation de matières actives insecticides au Togo a chuté régulièrement jusqu’à un litre/hectare, au même niveau que l’Australie qui recourt par ailleurs aux variétés génétiquement modifiées. La charge toxicologique, pesant sur l’homme mais aussi sur divers éléments de la faune comme les abeilles ou les daphnies des cours d’eau, a diminué quoique de manière moins régulière. Cette évolution est la conséquence d’une protection limitée des cultures cotonnières depuis trois décennies, à moins de six traitements, et de l’adoption de nouvelles générations de molécules insecticides. Au Togo, l’utilisation des insecticides dans la culture cotonnière a évolué dans une direction plus compatible avec le souci de la santé humaine et de la préservation de l’environnement. Une telle évolution devrait être extrapolable à tous les pays cotonniers de l’Afrique francophone où des études similaires mériteraient d’être réalisées.

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Luengo, Gustavo S., Anne-Laure Fameau, Fabien Léonforte e Andrew J. Greaves. "Surface science of cosmetic substrates, cleansing actives and formulations". Advances in Colloid and Interface Science 290 (aprile 2021): 102383. http://dx.doi.org/10.1016/j.cis.2021.102383.

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Tatini, Duccio, Paolo Tempesti, Francesca Ridi, Emiliano Fratini, Massimo Bonini e Piero Baglioni. "Pluronic/gelatin composites for controlled release of actives". Colloids and Surfaces B: Biointerfaces 135 (novembre 2015): 400–407. http://dx.doi.org/10.1016/j.colsurfb.2015.08.002.

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Kaushik, Prerna, Ravinder Verma, Vineet Mittal, Saurabh Bhatia, Anubhav Pratap-Singh e Deepak Kaushik. "Flavor Microencapsulation for Taste Masking in Medicated Chewing Gums—Recent Trends, Challenges, and Future Perspectives". Coatings 12, n. 11 (31 ottobre 2022): 1656. http://dx.doi.org/10.3390/coatings12111656.

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Chewing gum, being a pleasant formulation, requires effective taste-masking techniques, such as encapsulation methods along with an amalgamation of flavors and sweeteners. Taste-masked medicated chewing gum offers a palatable way of administering drugs and dietary supplements to children and old-aged people. The concept of chewing gum development provides a sustained and modified release of actives through various techniques, such as microencapsulation, cyclodextrin-complexation, buffering agents, ion exchange resin, solid dispersions, effervescent agents, etc. The taste, solubility, and stability of the active ingredient are the key parameters to be kept in mind, while formulating a medicated chewing gum. Flavor microencapsulation has been used as a crucial technology in the research and food industry to control sensory performance as demonstrated by the hefty number of chewing gum patents over the years. This manuscript provides an insight into conventional and novel taste-masking techniques employed in developing palatable chewing gums. Additionally, concepts of flavor microencapsulation, its applications, polymers, and patents have been discussed.

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Zhang, Fan, Haoran Tao, Yilin Li, Yanbing Wang, Yingying Zhou, Qunna Xu e Jianzhong Ma. "Enhanced Pickering Emulsion Stabilization of Cellulose Nanocrystals and Application for Reinforced and Hydrophobic Coatings". Coatings 12, n. 10 (20 ottobre 2022): 1594. http://dx.doi.org/10.3390/coatings12101594.

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For oil-in-water (O/W) Pickering emulsions, a new polymer stabilizer of butyl acrylate (BA) grafted cellulose nanocrystals (BA-g-CNCS) has been developed. By adjusting the BA concentration, the hydrophilic and hydrophobic surfaces of BA-g-CNCs could be systematically modified based on the controllable interface activity. Specifically, the emulsification stability of the as-prepared stabilizer was examined as a function of BA content, BA-g-CNCS usage, and oil type. The results showed that the Pickering emulsion stabilized by BA-g-CNCS had a 98% volume fraction of emulsion with long-term stability. Importantly, BA-g-CNCS could be a promising choice for polymer stabilizers and could generate high internal phase Pickering emulsions without cross-linking when combined with 13% BA and 1.75% BA-g-CNCS. Furthermore, it was established that BA-g-CNCs possessed self-emulsifying quality, worked as hydrophobic coatings, and improved the mechanical properties. This was of fundamental interest to polymer stabilizer and functional coatings, allowing for promising applications in coating fields such as fabrics, leather, paper, controlled encapsulation, and the release of actives in material science.

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Genova, Chiara, Elsa Fuentes, Gabriele Favero e Beatriz Prieto. "Evaluation of the Cleaning Effect of Natural-Based Biocides: Application on Different Phototropic Biofilms Colonizing the Same Granite Wall". Coatings 13, n. 3 (26 febbraio 2023): 520. http://dx.doi.org/10.3390/coatings13030520.

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Natural derivatives, such as essential oils, are presented as an alternative to classical biocides to the treatment of biocolonization. Thus, in this work, the cleaning and biocidal potential of some natural derivatives towards two natural biofilms’ growth on the same granite wall, with different microbial composition, was evaluated. For this purpose, three essential oils (EOs) (from Origanum vulgare, Thymus vulgaris and Calamintha nepeta) and their main active principles (APs) (carvacrol, thymol and R-(+)-pulegone, respectively) were embedded in a hydrogel matrix, with different combinations of EOs and APs, in order to evaluate the synergistic action of different actives. For comparative purposes, pure hydrogel and a mechanical method (brushing) were also used. Colorimetric measurements and chlorophyll a fluorescence analyses were performed to evaluate the cleaning action of the treatments on the biofilms. Overall, the EOs and APs present in the hydrogel proved to be reliable treatments to limit natural biocolonization, with O. vulgare being one of the most effective treatments in combination with other compounds, due to the majority presence of carvacrol. Moreover, the effect of the different treatments strictly depended on the biofilm in question, as well as its ability to adhere to the substrate.

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Tabuchi, Nobuhito, Tadashi Watanabe, Manabu Hattori, Kenichi Sakai, Hideki Sakai e Masahiko Abe. "Adsorption of Actives in Ophthalmological Drugs for Over-The-Counter on Soft Contact Lens Surfaces". Journal of Oleo Science 58, n. 1 (2009): 43–52. http://dx.doi.org/10.5650/jos.58.43.

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Bisset, Nicole B., Graham R. Webster, Yao Da Dong e Ben J. Boyd. "Understanding the kinetic mixing between liquid crystalline nanoparticles and agrochemical actives". Colloids and Surfaces B: Biointerfaces 175 (marzo 2019): 324–32. http://dx.doi.org/10.1016/j.colsurfb.2018.11.063.

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Più fonti

Tesi sul tema "Surfaces actives"

Berthet, Guillaume. "Revêtements diamant pour surfaces actives sur capteurs du domaine pétrolier". Electronic Thesis or Diss., Paris 6, 2017. http://www.theses.fr/2017PA066660.

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Dans le domaine pétrolier les alliages de nickel tels que l’Inconel sont majoritairement utilisés au cours des forages pour leur bonne résistance mécanique et chimique face à H2S, CO2 ou des acides carboxyliques. Cependant, en dépit de leurs excellentes propriétés, les parties sensibles des capteurs réalisés à partir de ces matériaux voient leurs performances altérées par les environnements hostiles de forages (conditions hautes pressions et hautes températures), la corrosion et l’abrasion. De plus, ces capteurs peuvent être exposés à divers fluides, durant un même forage, contenant des particules solides ou de très grosses molécules organiques telles que les asphaltènes, paraffines ou résines qui ont tendance à s’agglomérer sur les surfaces hydrophiles métalliques. Le diamant a été identifié comme un excellent candidat pour la fabrication de revêtements de protection pour des capteurs embarqués lors de forages pétroliers. En effet, le diamant offre une excellente résilience mécanique, une grande inertie chimique, un module d’Young élevé et une résistance à l’encrassement qui font de lui un matériau parfaitement adapté pour une utilisation en conditions hostiles. Cependant la réalisation d’un dépôt de diamant sur Inconel ne peut pas être réalisée via les solutions usuelles de MP-CVD. Les résultats de cette étude présentent trois différents procédés permettant d’obtenir un revêtement diamant adhérent sur des pièces 3D d’Inconel718. Ces procédés se différencient par leur rugosité et leur complexité de mise en œuvre. Leurs bénéfices sur des capteurs de densité-viscosité ont été évalués face à divers fluides pétroliers particulièrement encrassants. Pour lutter contre ces encrassements, deux approches ont été identifiées comme étant prometteuses : (i) développer des surfaces exploitant l’effet Lotus en réalisant une microstructure superhydrophobe, et (ii) optimiser un traitement électrochimique permettant de nettoyer des surfaces in-situ sans intervention humaine. Cette étude a permis de comprendre les mécanismes réactionnels en mettant en avant le rôle de la dégradation de l’eau lors du traitement électrochimique. Grace à cela, ces travaux indiquent les conditions d’utilisations et les limites du procédé. De plus le potentiel de cette technique face à des fluides de forage et du pétrole brut a été démontré avec succès
In the field of oil and gas industry, Inconel alloys are largely used for their high strength and good corrosion resilience to H2S, CO2 and carboxylic acids. However, those of despite their excellent properties compare to other alloys, some specific oil and gas parts such as the sensitive areas of some sensors may require a special attention as high pressure high temperature (HPHT) environment, corrosion and abrasion may affect their performances in the long term. Additionally, oil and gas sensors may often be exposed, during the same drilling work, to various drilling fluids containing hydrophilic solid particles or heavy molecules such as asphaltenes, resins or heavy alkanes which tend to aggregate on hydrophilic alloy surfaces. Diamond coatings have thus been identified as attractive candidates to protect sensor used during drilling operations. Indeed, diamond materials due to their excellent hardness and wear, low friction coefficient, corrosion resilience and chemical inertness further to high natural resilience to fouling are especially suitable to be used in harsh environments. However, diamond coating on Ni-alloy such as Inconel could not be done by MP-CVD common processes. The current study has proposed solutions, and namely the development of three different processes aiming at a strong and adherent diamond coating on Inconel718. These three processes differ by their roughness and their difficulties of implementation. Their advantages for density-viscosity sensors have been assessed in various drilling fluids, and two specific approaches have been identified as particularly promising to mitigate fouling, namely (i) to create a diamond superhydrophobic surface through micro-structuration to get the antifouling Lotus properties, and (ii) the optimization of an electrochemical treatment aiming at cleaning in situ the diamond surfaces downhole. This study has led to propose reaction mechanisms and demonstrated the role of degraded water on the electrochemical treatment. The thesis has demonstrated the potentialities and identified the limits of those approaches. Efficiency of the electrochemical process applied to drilling fluids and crude oils fouling have been successively demonstrated

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Breton, Sylvain. "Dynamique des surfaces planétaires actives : quantification des paysages, modélisation et inversion". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1280.

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Les cratères d'impact sont indispensables dans l'étude des surfaces planétaires. D'une part, les statistiques de leur nombre permet de dater les surfaces planétaires, d'autre part, leur forme révèle les processus de surface qu'ils ont connu. Cette thèse propose de coupler les études statistiques et morphologiques afin d'étudier la temporalité et l'importance des processus sédimentaires et/ou volcaniques des surfaces planétaires. L'utilisation de la profondeur des cratères permet de rajouter une dimension aux distributions avec l'introduction des distributions en fréquence de taille et de profondeur (SDFD), offrant ainsi un aperçu des modifications morphologiques des cratères. Nous avons développé en conséquence des modèles permettant de modéliser l'évolution d'une population de cratères en prenant en compte les phénomènes d'oblitération. La surface Mars est largement cratérisée, mais ils ont pour la plupart été fortement modifiés par des processus volcaniques et/ou sédimentaires. A partir des SDFDs, nous avons estimé les taux d'oblitération martiens à une échelle globale. Ces taux sont, au Noachien, de plusieurs milliers de m/Ga, mais décroissent rapidement dès l'Hespérien inférieur et sont proches de 0 à l'Amazonien. L'oblitération sur la province de Tharsis a décru beaucoup moins rapidement suggérant une persistance du volcanisme à l'Amazonien inférieur. Les plaines du nord à l'Amazonien sont marqué par des taux d'oblitération un ordre de grandeur au-dessus du reste de la planète, qui pourraient indiquer la mise en place continue de la Vastitas Borealis Formation au cours de l'Amazonien moyen. En complément de notre approche à l'échelle globale, nous avons déterminé des taux d'oblitération actuels à partir de cartographies de cratères réalisées à haute résolution spatiale sur des sites d'atterrissage de rovers actuels et futurs. Les sites de Mawrth Vallis et d'Oxia Planum présentent les taux d'oblitération actuels les plus importants en particulier au niveau de leurs unités geologiques riches en minéraux hydratés
Impact crater are often used in the study of planetary surfaces. On the one hand, statistics on crater number provide the age of the surface, on the other hand, their shapes reflect the surface processes they witnessed. This study combines the statistic and morphology approaches in order to investigate the timing and intensity of sedimentary and volcanic processes of planetary surfaces. The use of crater depth measurements add a dimension to frequency distributions with the introduction of size and depth frequency distribution (SDFD). SDFSs can be interpreted in term of crater obliteration rates thanks to crater chronology models. We also developed models of crater population taking into account obliteration. Mars surface is highly cratered with many craters displaying signs of modifications by volcanic process, sedimentation and erosion. We interpreted SDFDs using a classic crater chronology system, to produce global maps of obliteration at different epochs of Mars. During Noachian, obliteration rates reach several thousands m/Gy, but rapidly decrease during early Hesperian and are close to 0 during Amazonian. Obliteration on the province of Tharsis decreased slower, suggesting a persistence of volcanic activity until early Amazonian. Northern lowlands witness Amazonian obliteration rates one order of magnitude higher than the rest of the planet, which may indicate the continuous formation of Vastitas Borealis during middle Amazonian. In addition to our global approach, we computed recent obliteration rates from mapping of high resolution images on landing sites of rover missions. Mawrth Vallis and Oxia Planum present significant obliteration rates, especially on units containing hydrated minerals

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Gouaillard, Alexandre. "Contexte générique bi-multirésolution basé ondelettes pour l'optimisation d'algorithmes de surfaces actives". Lyon, INSA, 2005. http://theses.insa-lyon.fr/publication/2005ISAL0073/these.pdf.

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Segmentation is a crucial stage of anatomical data analyzis. Some applications among which screening of transgenic mice, require a robust and quick segmentation step to catch the high trhoughput rates. Robustness in segmentation is achived by means of a priori models represented as discrete surfaces and deformed by active contour algorithms. This segmentation technics, already exisiting (Kess et al. , 1988 - Cohen, 1991) is efficient and has been intensively used. Nowadays discrete model tend to increase in size (104 to 106 nodes) and so is the computational cost. Multi levels and/or multi resolution approaches on images have been used, succesfully, to yet improve the robustness and the speed. However, up to now, no multiresolution scheme has been applied on the model. The main goal of the work is to improve the speed and the robustness of active contour algorithms thanks to multiresolution approaches on both model and data. The result of this work is a bi-multiresolution framework within which any given active surface algorithm could be plugged. A mathematical study of the computational cost of the resultng algorithm shows that we can hope to speed up the algorithm by a factor 3. In real cases, gains of a factor 100 have been reached
Dans le cadre de l'analyse de données anatomiques, la segmentation est une étape indispensable. Certaines applications (criblage par imagerie de souris transgénique, par exemple) nécessitent impérativement de réaliser cette opération de manière rapide et robuste pour respecter les contraintes de débits d'acquisition et d'automatisation de l'analyse. La robustesse dans la segmentation des organes anatomiques est obtenue en s'appuyant sur des modèles maillés déformés par des techniques de type contours actifs. Cette stratégie de segmentation, déjà ancienne (Kass et al. , 1988 – Cohen, 1991) est pertinente et a fait ses preuves. Compte tenu de la taille des modèles utilisés (104 à 106 sommets), le temps de calcul pour la segmentation est très élevé. Des approches multi échelles et/ou multirésolution sur images ont déjà été utilisées avec succès pour améliorer la robustesse et la vitesse de convergence. Mais jusqu'ici, ce type d'approches n'avait pas été appliqué au modèle. L'objectif principal de la thèse est d'accélérer les méthodes de contours actifs / surfaces actives grâce à une décomposition multirésolution sur bases d'ondelettes des données et du modèle comme illustré par l'image précédente. Le résultat de la thèse est un environnement d'optimisation générique dans lequel n'importe quel algorithme de surface active discrète peut être plongé. Une modélisation mathématique de l'algorithme ainsi construit démontre un gain en complexité d'un facteur 3 dans le domaine d'utilisation envisagé. De plus, la convergence est encore accélérée par l'approche multirésolution, ce qui permet d'atteindre dans les cas réels des gains en vitesse de l'ordre de 100

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Kurylo, Ievgen. "Surfaces actives pour l'activation contrôlable de la programmation moléculaire basée sur l'ADN en microfluidique". Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1I073/document.

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Les organismes vivants prennent des décisions en permanence à l’aide de réseau de réactions chimiques couplées (CRN) les unes aux autres. Cette capacité a inspirée de nombreux scientifiques qui cherchent aujourd’hui à construire des versions synthétiques de ces réseaux pour créer des systèmes dynamiques complexes. Les molécules d’ADN constituent une solution idéale pour construire de tels CRNs. Le travail de recherche présenté dans ce manuscrit vise à développer des surfaces actives qui permettent d’interagir avec la PEN toolbox en environnement microfluidique afin de pouvoir utiliser pleinement le potentiel de tels systèmes moléculaires. Nous avons étudié l’utilisation de la PEN toolbox en microfluidique en explorant différents paramètres. Nous discuterons ensuite de la réalisation de surfaces actives et de leur caractérisation. Celles-ci sont concues pour permettre l’immobilisation de brins d’ADN via une liaison thiol et leur largage en solution en rompant électro-chimiquement cette liaison. Nous discuterons également d’aspect technique permettant l’intégration aisée d’une telle stratégie dans des dispositifs microfluidiques. Par la suite, nous montrerons qu’il est possible de contrôler spatio-temporellement le largage d’instructions à base d’ADN. Pour ce faire, nous nous appuierons sur une version plus évoluée de l’auto-catalyseur présenté précédemment. Nous mettrons en évidence qu’il est possible d’initier de façon contrôlée des phénomènes de réaction-diffusion dans des canaux microfluidiques.Pour finir, nous ouvrirons des perspectives pour la conception de surface actives permettant un niveau de contrôle encore plus grand des systèmes moléculaires
Living organisms perform complex information processing tasks with a help of intertwined chemical reaction networks (CRNs) and diffusion processes. These biological phenomena inspired scientists to design from the bottom-up dynamical systems with complex spatiotemporal behaviour. DNA provides a perfect solution for building these synthetic CRNs. Our research work focused on designing active surfaces with the aim to provide a convenient way to interact in microfluidics with the PEN toolbox (as an example of DNA-based CRNs) and explore the full potential of these novel biochemistry tools. We will study the step by step assembly and optimisation of the PEN toolbox parameters. Next, we will discuss the construction and characterisation of active surfaces, which provide loading and controllable release of DNA input, based on formation and electrochemical cleavage of gold-thiol bond. We will also provide a technological solution to integrate these surfaces and the PEN toolbox in microfluidics. We will show controllable triggering of basic activation and autocatalysis PEN toolbox modules. We will further apply our method for spatiotemporal control of autocatalytic CRNs, which have higher stability then simple autocatalytic module while still providing an exponential signal amplification contrary to the activation module. This approach allows us to investigate and optimise the parameters of our technology. Finally, we will discuss the construction of active surfaces with irreversibly bound DNA, which provides a higher level of the PEN toolbox spatiotemporal behaviour, based on electrical polarisation and tuning the shape of surface-attached DNA patterns

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Gouaillard, Alexandre Odet Christophe. "Contexte générique bi-multirésolution basé ondelettes pour l'optimisation d'algorithmes de surfaces actives avelet-based bi-multiresolution framework for active contour models /". Villeurbanne : Doc'INSA, 2006. http://docinsa.insa-lyon.fr/these/pont.php?id=gouaillard.

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Hurtrez, Guy. "Etude des copolymères poly(styrène-b-oxyde d'éthylène) : synthèses, propriétés colloïdales et tensio-actives". Mulhouse, 1992. http://www.theses.fr/1992MULH0257.

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Des copolymères séquencés polystyrène-poly(oxyde d'éthylène) à caractéristiques variées ont été préparés par voie anionique et caractérisés. Leur fonctionnalisation par des groupes sulfonates et carboxylates a été réalisée avec un rendement de 90%. Une étude viscosimétrique a montré leur comportement particulier en milieu tétrahydrofuranne et toluène. La fonctionnalisation de polymères par des composés du type triazine a été utilisée pour tenter de préparer par désactivation des copolymères de structure particulière. Des molécules chromophores type anthracène et phénanthrène ont été incorporées à la jonction des séquences hydrophiles et hydrophobes avec un rendement de 100%. La micellisation en milieu aqueux des copolymères a abouti à une méthode de préparation des solutions qui permet d'étendre considérablement la gamme des copolymères micellisables en évitant la formation d'agrégats. L'analyse de ces solutions par diffusion de la lumière a montré qu'il existe une relation entre le rayon de la micelle et les caractéristiques moléculaires du copolymère. L'influence de la fonctionnalisation et du marquage fluorescent sur la taille des micelles a également été étudiée. Le transfert d'énergie non radiatif entre les molécules chromophores incorporées dans les copolymères a permis de mettre en évidence la micellisation en milieu aqueux. La formation de la micelle en milieu solvant/solvant sélectif et la concentration micellaire critique ont ainsi pu être détectées et mesurées

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Sefti, Rania. "Méthodes d'approximation de contours et de surfaces actifs pour la segmentation d'images médicales". Electronic Thesis or Diss., Orléans, 2024. http://www.theses.fr/2024ORLE1037.

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L'extraction automatique d'informations et la détection d'objets à partir d'images médicales ont connu un essor considérable ces dernières années. Ces avancées offrent aux cliniciens de nouvelles possibilités d'exploration et d'aide au diagnostic. Cependant, le processus de segmentation demeure complexe et présente de nombreux défis.Ce travail de thèse vise à développer des méthodes de segmentation d'images médicales basées sur les B-Snakes. En exploitant les propriétés des fonctions splines, nous avons amélioré la précision et la performance des contours actifs paramétriques (ou surfaces actives) pour la segmentation d’images médicales. Tout d'abord, nous avons introduit une nouvelle fonction d'approximation spline d'Hermite généralisée avec un support optimal et une erreur d'interpolation contrôlée. Ensuite, en utilisant un modèle d'apprentissage profond,nous avons développé un nouveau terme d'énergie qui met en avant l'importance de l'analyse des variations d'intensité et des textures. Puis nous avons introduit une étape d'équilibrage, fondée sur la géométrie de l'objet et de ses propriétés de courbe/surface. Ceci permet d’aligner la surface équilibrée du Snake avec les parties complexes de l'objet. Enfin, nous avons introduit un nouvel algorithme de déformation du Snake appelé méthode de déformation itérative progressive (PID). Celui-ci adapte itérativement les points de contrôle pour construire une série de courbes d'ajustement jusqu'à ce que la limite de l'objet soit détectée, sans qu'il ne soit nécessaire de résoudre les problèmes de minimisation de l'énergie. Les techniques proposées ont été rigoureusement évaluées, démontrant ainsi leur efficacité et leur robustesse dans diverses conditions d'application incluant un large éventail de données et différentes modalités d'imagerie
Automatic information extraction and object detection from medical images has advanced significantly in recent years. These advances offer clinicians new opportunities for exploration and diagnostic support. However, the segmentation process remains complex and presents many challenges. The aim of this thesis is to develop medical image segmentation methods based on B-Snakes. By exploiting the properties of spline functions, we have improved the accuracy and performance of parametric active contours (or active surfaces) for medical image segmentation. First, we introduced a new generalised Hermite spline approximation function with optimal support and controlled interpolation error. Then, using a deep learning model, we developed a new energy term that emphasises the importance of intensity variation and texture analysis. We then introduced a balancing step based on the geometry of the object and its curve/surface properties. This aligns the balanced Snake surface with the complex parts of theobject. Finally, we introduced a new snake deformation algorithm called Progressive Iterative Deformation (PID).This iteratively adjusts the control points to construct a series of fitting curves until the boundary of the object isdetected, without the need to solve energy minimisation problems. The proposed techniques have been rigorously evaluated, demonstrating their effectiveness and robustness under a variety of application conditions, including a wide range of data and different imaging modalities

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Moura, Tulio-Flavio. "Relations interfaciales, entre molécules actives végétales et substances auxiliaires, induites par la nébulisation : application aux extraits de Ruscus aculeatus L. et Malpighia glabra L". Montpellier 1, 1994. http://www.theses.fr/1994MON13520.

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Nguyen, Hoang Truc Phuong. "Formulation de nanosystèmes et évaluation de leur potentiel pour la délivrance cutanée de molécules actives". Thesis, Tours, 2015. http://www.theses.fr/2015TOUR3806/document.

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Ces travaux visent à déterminer l‘intérêt de deux types de nanosystèmes (NS) coeur-couronne dans des applications dermatologiques ou cosmétiques. Les nanocapsules lipidiques (LNC) sont obtenues par une méthode déjà décrite dans la littérature. Leur formule est modifiée pour incorporer un actif cosmétique d‘intérêt. Les nanocapsules d‘alginate (ANC) sont développées au moyen de plans d‘expériences. Elles sont composées d‘un coeur huileux et d‘une coque d‘alginate de calcium gélifiée obtenue par gélification ionique de surface d‘une nanoémulsion. Des méthodes basées sur le phénomène de fluorescence nous permettent de mettre en évidence l‘endocytose des ANC par les kératinocytes. Leur contenu est rapidement libéré dans le cytoplasme. Une étude sur différents modèles ex vivo montre que les deux nanosystèmes permettent aux molécules encapsulées d‘atteindre les couches vivantes de l‘épiderme. ANC et LNC sont stables plusieurs mois dispersées dans des formes galéniques semi-solides. Ces deux NS sont donc adaptés à la délivrance de molécules actives dans la peau
Two types of core-shell nanosystems have been evaluated for dermatological and cosmetic applications. Lipid nanocapsules (LNC) are obtained by a method that has already been described in the literature. Their composition is adapted for incorporation of a specific cosmetic ingredient. Alginate nanocapsules (ANC) are developed with the aid of experimental design. They consist of a triglyceride core with a rigid calcium alginate shell obtained by ionic gelation of the surface of a nanoemulsion. By incorporating fluorophores into these nanosystems, they can be studied by advanced spectral fluorescence imaging methods. We were thus able to show that ANC are first internalized into keratinocytes by endocytosis, and once inside the cells, their contents are rapidly released into the cytoplasm. A study of different ex vivo skin model systems has shown that both nanosystems enable active substances to reach the living epidermis. When incorporated into gels similar to those used as galenic forms for topical administration, LNC and ANC remain stable for months. They can thus be used as vectors for delivering active substances to the skin

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Khan, Suleman Manawar. "Surface active lanthanide complexes for sensing applications on silica and gold surfaces". Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5726/.

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The work presented in this thesis investigates the use of new luminescent lanthanide bis-amide DTPA complexes, both in solution and bound to gold and silica surfaces. The bis-amide arms have been modified with surface attachment groups consisting of disulphides, thioacetates and silyl ethers. Both sensitising and non-sensitising bisamides arms were attached to DTPA in order to develop the best lanthanide based sensor. When these visible and NIR emitting lanthanide complexes are bound to the surface they can be used to detect various small analytesm including benzoic acid, phthalic acid, isophthalic acid, picolinic acid, dipicolinic acid, quinaldic acid, dibenzoyl methane and curcumin. The detection of analytes was performed on surfaces and in solution allowing for comparisons between the two techniques to be made. Lanthanide complexes were attached to silica microparticles and they were used for detection of analytes under flow conditions; these studies were compared to surface and solution analyte detection. The lanthanide-based silica microparticles were developed further to show the advantages of bimodal luminescent silica microparticles. The development of self-assembled monolayers of the lanthanide complexes on gold were studied using surface plasmon resonance and ellipsometry.

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Libri sul tema "Surfaces actives"

E, Clark David, Folz Diane C, Simmons J. H. 1941-, Hench L. L, Larry Hench Symposium on Surface-Active Processes in Materials (1999 : Cocoa Beach, Fla.) e Conference on Composites, Advanced Ceramic Materials, and Structures (23rd : 1999 : Cocoa Beach, Fla.), a cura di. Surface-active processes in materials. Westerville, Ohio: American Ceramic Society, 2000.

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Myers, Drew. Surfactant science and technology. 2^a ed. New York: VCH Publishers, 1992.

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Myers, Drew. Surfactant science and technology. 3^a ed. Hoboken, NJ: J. Wiley, 2005.

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Rosen, Milton J. Surfactants and interfacial phenomena. 3^a ed. Hoboken, N.J: Wiley-Interscience, 2004.

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Rosen, Milton J. Surfactants and interfacial phenomena. 2^a ed. New York: Wiley, 1989.

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Myers, Drew. Surfactant Science and Technology. New York: John Wiley & Sons, Ltd., 2005.

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Myers, Drew. Surfactant science and technology. Weinheim: VCH, 1988.

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Wolf, Rory A. Plastic surface modification: Surface treatment and adhesion. Munich [Germany]: Hanser, 2010.

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J, Texter, a cura di. Reactions and synthesis in surfactant systems. New York: Marcel Dekker, 2001.

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Meunier, Jacques. Physics of Amphiphilic Layers: Proceedings of the Workshop, Les Houches, France February 10-19, 1987. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987.

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Capitoli di libri sul tema "Surfaces actives"

Gooch, Jan W. "Surface Active". In Encyclopedic Dictionary of Polymers, 715. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11428.

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Kientz, Julie A., Matthew S. Goodwin, Gillian R. Hayes e Gregory D. Abowd. "Shared Active Surfaces". In Interactive Technologies for Autism, 57–66. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-031-01595-3_6.

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Toennies, Klaus D. "Active Contours and Active Surfaces". In Guide to Medical Image Analysis, 311–60. London: Springer London, 2017. http://dx.doi.org/10.1007/978-1-4471-7320-5_9.

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Toennies, Klaus D. "Active Contours and Active Surfaces". In Guide to Medical Image Analysis, 261–97. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-2751-2_9.

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Bognolo, Guido. "Amphoteric Surfactants". In Surface Active Agents, 31–33. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003403869-7.

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Bognolo, Guido. "Anionic Surfactants". In Surface Active Agents, 35–65. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003403869-8.

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Bognolo, Guido. "Nonionic Surfactants". In Surface Active Agents, 71–95. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003403869-10.

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Bognolo, Guido. "Soap-Making Process and Raw Materials". In Surface Active Agents, 19–21. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003403869-3.

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Bognolo, Guido. "Washing Linen and Clothes". In Surface Active Agents, 103–4. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003403869-13.

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Bognolo, Guido. "Cationic Surfactants". In Surface Active Agents, 67–70. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003403869-9.

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Atti di convegni sul tema "Surfaces actives"

Franke, Lars, Steffen Klingel e Marco Rahm. "Electromechanically Tunable Metasurface for Guided Spoof Surface Plasmon Polaritons". In CLEO: Applications and Technology, JTu2A.64. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/cleo_at.2024.jtu2a.64.

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We report an electromechanically tunable metasurface for active manipulation of spoof surface plasmon polaritons (SSPPs). We designed a dynamic SSPP low pass filter that can be actively controlled by application of an electric bias field.

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Scalora, Michael. "Unraveling novel surface phenomena: intricacies of the nonlinear optical properties of aluminum through bound electrons". In Active Photonic Platforms (APP) 2024, a cura di Ganapathi S. Subramania e Stavroula Foteinopoulou, 33. SPIE, 2024. http://dx.doi.org/10.1117/12.3028709.

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Hao, Qian-Zhu, e Po-Chun Hsu. "Spatiotemporal variability of sea surface temperature, sea surface height, and water quality along the northwestern coast of Taiwan". In Active and Passive Remote Sensing of Oceans, Seas, and Lakes, a cura di Kuo-Hsin Tseng, Robert J. Frouin, Jong-Kuk Choi e Hiroshi Murakami, 20. SPIE, 2025. https://doi.org/10.1117/12.3042061.

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Scarborough, C., J. Molles e Z. Popović. "Active Nonlinear Impedance Surfaces for Power Generation". In 2024 Eighteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials), 1–3. IEEE, 2024. http://dx.doi.org/10.1109/metamaterials62190.2024.10703215.

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Norris, David J. "Optical and electronic fourier surfaces". In Active Photonic Platforms (APP) 2022, a cura di Ganapathi S. Subramania e Stavroula Foteinopoulou. SPIE, 2022. http://dx.doi.org/10.1117/12.2632810.

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Chan, Che Ting, e Kun Ding. "Interaction of artificially patterned surfaces (Conference Presentation)". In Active Photonic Platforms X, a cura di Ganapathi S. Subramania e Stavroula Foteinopoulou. SPIE, 2018. http://dx.doi.org/10.1117/12.2320094.

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Grönvall, Erik, Patrizia Marti, Alessandro Pollini e Alessia Rullo. "Active surfaces". In the 4th Nordic conference. New York, New York, USA: ACM Press, 2006. http://dx.doi.org/10.1145/1182475.1182486.

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Mehta, Meghna, Ahmed Sabbir Arif, Apurva Gupta, Sean DeLong, Roozbeh Manshaei, Graceline Williams, Manasvi Lalwani, Sanjay Chandrasekharan e Ali Mazalek. "Active Pathways". In ISS '16: 2016 ACM International Conference on Interactive Surfaces and Spaces. New York, NY, USA: ACM, 2016. http://dx.doi.org/10.1145/2992154.2992176.

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Meyer, Sebastian, e Dmitry N. Chigrin. "Design of reconfigurable meta-surfaces: modeling done right (Conference Presentation)". In Active Photonic Platforms X, a cura di Ganapathi S. Subramania e Stavroula Foteinopoulou. SPIE, 2018. http://dx.doi.org/10.1117/12.2321120.

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Burr, T. A., e K. D. Kolenbrander. "A Silicon Solid-State LED: Long-Lived Visible Electroluminescence from Silicon Nanocrystallites". In Microphysics of Surfaces: Nanoscale Processing. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/msnp.1995.msaa2.

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We have constructed and characterized visible electroluminescent devices based on Si nanocrystallite thin films. The key to stable electroluminescent emission is the nature of the Si surface capping layer, which determines the efficiency and stability of the devices. The layers must be transparent to the emitted light, provide sufficient electrical contact to insure carrier transport to the active layer, stabilize the Si surfaces to prevent chemical and electrical degradation, and passivate the dangling surface bonds which would act as non-radiative recombination centers and quench emission. Our devices use Al and ITO (indium tin oxide) electrodes, as well as transparent polymer capping layers to provide the necessary carrier injection and chemical and electronic passivation for the silicon nanocrystallite active layer. Their electrical and optical behavior was evaluated in terms of the I-V characteristics, electroluminescence spectra, and photoluminescence spectra. These devices represent a first step towards developing efficient silicon based light-emitting technology.

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Rapporti di organizzazioni sul tema "Surfaces actives"

López-Valverde, Nansi, Javier Aragoneses, Antonio López-Valverde, Cinthia Rodríguez e Juan Manuel Aragoneses. Role in the osseointegration of titanium dental implants, of bioactive surfaces based on biomolecules: A systematic review and meta-analysis of in vivo studies. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, giugno 2022. http://dx.doi.org/10.37766/inplasy2022.6.0076.

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Review question / Objective: Does the bioactive surface of titanium dental implants, based on biomolecules, influence osseointegration?. The aim of our study was to evaluate the role and efficacy of bioactive surfaces in osseointegration. Our review study limited the research interest to titanium dental implants coated with a biomolecule, i.e., an organic molecule produced by a living organism. Condition being studied: In recent years, much attention has been paid to topographical modifications of dental implant surfaces, as well as to their coating with biologically active substances.a bioactive surface is one capable of achieving faster and higher quality osseointegration, shortening waiting times and solving situations of poor bone quality. Molecules that can be applied for bioactive purposes include bioceramics, ions and biomolecules. Collagen and bone morphogenetic protein have been suggested as bone stimulating agents. Biofunctionalization of the implant surface with a biomimetic active peptide has also been shown to result in a significant increase in bone-to-implant ratios and an increase in peri-implant bone density.

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Choudhary, Ruplal, Victor Rodov, Punit Kohli, Elena Poverenov, John Haddock e Moshe Shemesh. Antimicrobial functionalized nanoparticles for enhancing food safety and quality. United States Department of Agriculture, gennaio 2013. http://dx.doi.org/10.32747/2013.7598156.bard.

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Original objectives The general goal of the project was to utilize the bactericidal potential of curcumin- functionalizednanostructures (CFN) for reinforcement of food safety by developing active antimicrobial food-contact surfaces. In order to reach the goal, the following secondary tasks were pursued: (a) further enhancement of the CFN activity based on understanding their mode of action; (b) preparing efficient antimicrobial surfaces, investigating and optimizing their performance; (c) testing the efficacy of the antimicrobial surfaces in real food trials. Background to the topic The project dealt with reducing microbial food spoilage and safety hazards. Cross-contamination through food-contact surfaces is one of the major safety concerns, aggravated by bacterial biofilm formation. The project implemented nanotech methods to develop novel antimicrobial food-contact materials based on natural compounds. Food-grade phenylpropanoidcurcumin was chosen as the most promising active principle for this research. Major conclusions, solutions, achievements In agreement with the original plan, the following research tasks were performed. Optimization of particles structure and composition. Three types of curcumin-functionalizednanostructures were developed and tested: liposome-type polydiacetylenenanovesicles, surface- stabilized nanoparticles and methyl-β-cyclodextrin inclusion complexes (MBCD). The three types had similar minimal inhibitory concentration but different mode of action. Nanovesicles and inclusion complexes were bactericidal while the nanoparticlesbacteriostatic. The difference might be due to different paths of curcumin penetration into bacterial cell. Enhancing the antimicrobial efficacy of CFN by photosensitization. Light exposure strengthened the bactericidal efficacy of curcumin-MBCD inclusion complexes approximately three-fold and enhanced the bacterial death on curcumin-coated plastic surfaces. Investigating the mode of action of CFN. Toxicoproteomic study revealed oxidative stress in curcumin-treated cells of E. coli. In the dark, this effect was alleviated by cellular adaptive responses. Under light, the enhanced ROS burst overrode the cellular adaptive mechanisms, disrupted the iron metabolism and synthesis of Fe-S clusters, eventually leading to cell death. Developing industrially-feasible methods of binding CFN to food-contact surfaces. CFN binding methods were developed for various substrates: covalent binding (binding nanovesicles to glass, plastic and metal), sonochemical impregnation (binding nanoparticles to plastics) and electrostatic layer-by-layer coating (binding inclusion complexes to glass and plastics). Investigating the performance of CFN-coated surfaces. Flexible and rigid plastic materials and glass coated with CFN demonstrated bactericidal activity towards Gram-negative (E. coli) and Gram-positive (Bac. cereus) bacteria. In addition, CFN-impregnated plastic material inhibited bacterial attachment and biofilm development. Testing the efficacy of CFN in food preservation trials. Efficient cold pasteurization of tender coconut water inoculated with E. coli and Listeriamonocytogeneswas performed by circulation through a column filled with CFN-coated glass beads. Combination of curcumin coating with blue light prevented bacterial cross contamination of fresh-cut melons through plastic surfaces contaminated with E. coli or Bac. licheniformis. Furthermore, coating of strawberries with CFN reduced fruit spoilage during simulated transportation extending the shelf life by 2-3 days. Implications, both scientific and agricultural BARD Report - Project4680 Page 2 of 17 Antimicrobial food-contact nanomaterials based on natural active principles will preserve food quality and ensure safety. Understanding mode of antimicrobial action of curcumin will allow enhancing its dark efficacy, e.g. by targeting the microbial cellular adaptation mechanisms.

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Azad, MD. Active and passive meta-surfaces and their interaction with terahertz waves. Office of Scientific and Technical Information (OSTI), dicembre 2014. http://dx.doi.org/10.2172/1164767.

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Balch, William M., e Cynthia H. Pilskaln. Transport of Optically Active Particles from the Surface Mixed Layer. Fort Belvoir, VA: Defense Technical Information Center, settembre 2003. http://dx.doi.org/10.21236/ada620100.

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Kuksenova, L. I. WEAR RESISTANCE OF BRONZES UNDER FRICTION IN SURFACE-ACTIVE LUBRICANTS. DOI СODE, 2022. http://dx.doi.org/10.18411/vntr2022-167-3.

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Kevin Blinn, Yongman Choi e Meilin Liu. Characterization of Atomic and Electronic Structures of Electrochemically Active SOFC Cathode Surfaces. Office of Scientific and Technical Information (OSTI), agosto 2009. http://dx.doi.org/10.2172/984650.

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Husson, Scott M., Viatcheslav Freger e Moshe Herzberg. Antimicrobial and fouling-resistant membranes for treatment of agricultural and municipal wastewater. United States Department of Agriculture, gennaio 2013. http://dx.doi.org/10.32747/2013.7598151.bard.

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This research project introduced a novel membrane coating strategy to combat biofouling, which is a major problem for the membrane-based treatment of agricultural and municipal wastewaters. The novelty of the strategy is that the membrane coatings have the unique ability to switch reversibly between passive (antifouling) and active (antimicrobial) fouling control mechanisms. This dual-mode approach differs fundamentally from other coating strategies that rely solely on one mode of fouling control. The research project had two complementary objectives: (1) preparation, characterization, and testing of dual-mode polymer nanolayers on planar surfaces and (2) evaluation of these nanolayers as membrane modifiers. The first objective was designed to provide a fundamental understanding of how polymer nanolayer chemistry and structure affect bacterial deposition and to demonstrate the reversibility of chemical switching. The second objective, which focused on membrane development, characterization, and testing, was designed to demonstrate methods for the production of water treatment membranes that couple passive and active biofouling control mechanisms. Both objectives were attained through synergistic collaboration among the three research groups. Using planar silicon and glass surfaces, we demonstrated using infrared spectroscopy that this new polymer coating can switch reversibly between the anti-fouling, zwitterion mode and an anti-microbial, quaternary amine mode. We showed that switching could be done more than 50 times without loss of activity and that the kinetics for switching from a low fouling zwitterion surface to an antimicrobial quaternary amine surface is practical for use. While a low pH was required for switching in the original polymer, we illustrated that by slightly altering the chemistry, it is possible to adjust the pH at which the switching occurs. A method was developed for applying the new zwitterionic surface chemistry onto polyethersulfone (PES) ultrafiltration membranes. Bacteria deposition studies showed that the new chemistry performed better than other common anti-fouling chemistries. Biofilm studies showed that PESultrafiltration membranes coated with the new chemistry accumulated half the biomass volume as unmodified membranes. Biofilm studies also showed that PES membranes coated with the new chemistry in the anti-microbial mode attained higher biofilm mortality than PES membranes coated with a common, non-switchablezwitterionic polymer. Results from our research are expected to improve membrane performance for the purification of wastewaters prior to use in irrigation. Since reduction in flux due to biofouling is one of the largest costs associated with membrane processes in water treatment, using dual-mode nanolayer coatings that switch between passive and active control of biofouling and enable detachment of attached biofoulants would have significant economic and societal impacts. Specifically, this research program developed and tested advanced ultrafiltration membranes for the treatment of wastewaters. Such membranes could find use in membrane bioreactors treating municipal wastewater, a slightly upgraded version of what presently is used in Israel for irrigation. They also may find use for pretreatment of agricultural wastewaters, e.g., rendering facility wastewater, prior to reverse osmosis for desalination. The need to desalinate such impaired waters water for unlimited agricultural use is likely in the near future.

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Eric D. Wachsman. Electro-catalytically Active, High Surface Area Cathodes for Low Temperature SOFCs. Office of Scientific and Technical Information (OSTI), settembre 2006. http://dx.doi.org/10.2172/909486.

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Owens, Donna, e H. Schuman. Demonstration of an Active Electronically Scanned Array on a Conic Surface. Fort Belvoir, VA: Defense Technical Information Center, giugno 1993. http://dx.doi.org/10.21236/ada344607.

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Bae, I., H. Huang, E. Yeager e D. A. Scherson. In-Situ Spectroscopic Studies of Redox Active Self-Assembled Monolayers on Gold Electrode Surfaces. Fort Belvoir, VA: Defense Technical Information Center, ottobre 1990. http://dx.doi.org/10.21236/ada235564.

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