Auswahl der wissenschaftlichen Literatur zum Thema „Nettoyage de structures fragiles“
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Zeitschriftenartikel zum Thema "Nettoyage de structures fragiles"
Lefrançois, Mélanie, Johanne Saint-Charles und Karen Messing. „« Travailler la nuit pour voir ses enfants, ce n’est pas l’idéal ! »“. Articles 72, Nr. 1 (19.04.2017): 99–124. http://dx.doi.org/10.7202/1039592ar.
Der volle Inhalt der QuelleKARAİSMAİLOĞLU, Mehmet Cengiz, und Özal GÜNER. „Nutlet structures of subsection Fragiles of the genus Stachys (Lamiaceae) from Turkey and their systematic applications“. TURKISH JOURNAL OF BOTANY 43, Nr. 5 (06.09.2019): 659–72. http://dx.doi.org/10.3906/bot-1812-31.
Der volle Inhalt der QuelleDesmichel, Pascal. „Les associations de valorisation du patrimoine ferroviaire dans le Massif central“. Les associations de patrimoine et le tourisme 30, Nr. 2 (07.09.2012): 71–81. http://dx.doi.org/10.7202/1012244ar.
Der volle Inhalt der QuelleBosqué, Clément. „La force d’âme, pour penser le management“. Forum 169, Nr. 2 (24.11.2023): 34–41. http://dx.doi.org/10.3917/forum.169.0034.
Der volle Inhalt der QuelleBodéré, Jean-Claude. „Le rôle des influences structurales sur le tracé d’une côte rocheuse volcanique : l’exemple des strandflats du sud-est de l’Islande“. Géographie physique et Quaternaire 35, Nr. 2 (01.02.2011): 231–40. http://dx.doi.org/10.7202/1000439ar.
Der volle Inhalt der QuelleGIRARDIN, Michaël. „Oppression, exploitation, persécution ? Historiographie de la fiscalité en Judée séleucide et romaine“. Archimède. Archéologie et histoire ancienne 10 (November 2023): 106–18. http://dx.doi.org/10.47245/archimede.0010.ds2.04.
Der volle Inhalt der QuellePetit, A., L. Berton, L. de Bastard, A. Ben Hellal, F. Prudhomme und O. Richard. „Collaboration ville–aide médicale urgente–hôpital à l’épreuve de la crise Covid-19, l’expérience des Yvelines“. Annales françaises de médecine d’urgence 10, Nr. 4-5 (September 2020): 212–17. http://dx.doi.org/10.3166/afmu-2020-0261.
Der volle Inhalt der QuelleBARALE-PENANGUER, MA, S. BERNAUDON, J. CARVELLI, A. JANCZEWSKI und J. FORTE. „POURQUOI TRANSFERE-T-ON AUX URGENCES DES RESIDENTS D'EHPAD EN FIN DE VIE ? UNE ETUDE QUALITATIVE AUPRES DES PROFESSIONNELS DES HAUTES ALPES“. EXERCER 34, Nr. 194 (01.06.2023): 252–58. http://dx.doi.org/10.56746/exercer.2023.194.252.
Der volle Inhalt der QuelleLe, Jacques. „Les banques américaines et la baisse des taux d'intérêt“. Revue de l'OFCE 48, Nr. 1 (01.01.1994): 131–50. http://dx.doi.org/10.3917/reof.p1994.48n1.0131.
Der volle Inhalt der QuelleLeandre, Konan Loukou, Kouadio Ahou Rosine, Essis Marie Laure, Kedote Marius, Fobil Julius und Tiembre Issaka. „Pollution de l’air et comportement à risque des employés de boulangerie à Abidjan (Côte d’Ivoire)“. European Scientific Journal, ESJ 18, Nr. 24 (31.07.2022): 90. http://dx.doi.org/10.19044/esj.2022.v18n24p90.
Der volle Inhalt der QuelleDissertationen zum Thema "Nettoyage de structures fragiles"
Mercadier, Thomas. „Retrait particulaire par étalement et retrait d’un film de résine“. Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALT095.
Der volle Inhalt der QuelleEfficient particle contamination removal is crucial in maximizing yield within the microelectronics industry. However, conventional particle removal techniques may become impractical when dealing with complex and fragile surface structures, as their application can potentially cause physical damage. This challenge has led to the development of new cleaning processes based on innovative concepts, such as a resist film lift off approach. The resist film lift-off leads to the particle removal due to the particle surface bonded to the resist. One of these particle removal processes is studied in this manuscript. In this process, the resist film is composed of two immiscible organic polymers. The process consists of the resist spin-coating followed by a diluted ammonia dispense at room temperature. Thanks to the latter chemical step, one of the polymers is dissolved inducing the delamination and lift-off of the remaining polymer with drag and lift forces.This manuscript sheds light on the critical role of the organization of two immiscible polymers within the resist film in the context of film lift-off. The organization of these polymers was shown to depend on the substrate surface energy through Tof SIMS analysis. For instance, on a hydrophilic substrate, the soluble polymer exhibits a pronounced affinity for the interface. Such an organization on hydrophilic surface minimizes the interfacial area that needs to be delaminated during the resist removal step. Consequently, the effectiveness of ammonia-based film removal relies on the substrate’s surface energy and is only achievable if the substrate surface energy is below 66mN/m.This manuscript provides valuable insights into the modification of the polymers’ organization. The tuning of some parameters from the resist formulation as the blend ratio or the resist thickness and the addition of a bake after the coating are shown to modify this surface energy peeling limit. Additionally, a Particle Removal Efficiency study was conducted on blanket wafers to determine and understand how these three parameters influence cleaning efficiency. It has led to the optimization of process efficiency. This optimized process efficiency was evaluated on structured surfaces. The results showcased its capability to efficiently remove particles while preserving the integrity of delicate structures.This PhD project has contributed to broadening the comprehension of particle removal using a resist peeling process. Moreover, it has demonstrated the potential application of this method in an industrial context
Romani, Raja. „Rupture en compression des structures hétérogènes à base de matériaux quasi-fragiles“. Paris 6, 2013. http://www.theses.fr/2013PA066551.
Der volle Inhalt der QuelleQuasi brittle materials such as rocks, ceramics and concrete often exhibit heterogeneities (cracks, cavities, inclusions,. . . ). Under a compressive loading, stable cracks can take place and grow from these heterogeneities. This work is devoted to the study of the crack onset in quasi brittle materials under a uniaxial compressive loading. The plaster, a good model for ceramics, is the model material chosen in this study. The crack onset is studied in a structure of plaster containing a single cavity and in a structure of plaster with multiple cavities arranged in a periodic array in quincunx. For the two structures, the crack initiation is determined following two approaches: an experimental approach based on the 2D digital image correlation (2D-DIC) and a theoretical approach based on the mixed criterion of Leguillon. The 2D-DIC allows following the strain field around the cavity. In order to determine the crack onset experimentally, a method based on the analysis of the strain history is developed. The mixed criterion states that the crack onset occurs when the two conditions : the stress condition and the energy condition are simultaneously satisfied. The predictions based on the mixed criterion are in good agreement with experimental results
Vassaux, Maxime. „Comportement mécanique des matériaux quasi-fragiles sous sollicitations cycliques : de l’expérimentation numérique au calcul de structures“. Thesis, Cachan, Ecole normale supérieure, 2015. http://www.theses.fr/2015DENS0010/document.
Der volle Inhalt der QuelleMacroscopic mechanical behavior models are developed for their light computational costs, allowing the simulation of large structural elements, and the precise description of mechanical phenomena observed by the material at lower scales. Such constitutive models are here developed in the seismic solicitation framework, therefore implying cyclic alternate loadings at the material scale, and applied to civil engineering buildings, often made of concrete, or more generally of quasi-brittle materials. To date, macroscopic models applicable to structural computations, while representing the cyclic mechanical behavior are rare. In consequence of the intricacy of the fracture processes to homogenize, macroscopic constitutive models either do not present sufficient robustness or miss on important phenomena. One of the limitations to the resolution of this issue is the lack of experimental data. Indeed, because of the complexity of the experiments to set up, few results on alternate cyclic tests on concrete are available in the literature.A virtual testing approach has therefore been established on a microscopic model of the material, able to provide results needed to the formulation and the calibration of a macroscopic model. In the microscopic model, the material is considered as structure itself, it is developed so as to only necessitate a reduced amount of results from controlled experimental tests, in order to be used. The microscopic model, a lattice discrete element model, has been developed on the basis of an existing lattice model and extended to the simulation of multi-axial and cyclic loadings. The microscopic model has then been validated as a virtual testing tool and used to establish equations of the macroscopic model, on the basis of damage and plasticity theories. The consistency of the proposed constitutive relation, embedding progressive unilateral effect, has been achieved using non-linear elasticity. The macroscopic model has finally been calibrated, entirely with the microscopic model, and employed to simulate the response of a reinforced concrete wall under alternate shear loading. This simulation has served to showcase the numerical robustness of the proposed model, as well as the significant contribution of the uni-axial alternate behavior of concrete to the structural damping of such structures
Lespine, Ismael. „Influence de la géométrie des structures sur les propriétés de rupture dans les matériaux quasi-fragiles“. Bordeaux 1, 2007. http://www.theses.fr/2007BOR13533.
Der volle Inhalt der QuelleOliver-Leblond, Cécile. „Comportement à rupture des structures : description à deux échelles des mécanismes locaux appliquée aux matériaux fragiles renforcés“. Thesis, Cachan, Ecole normale supérieure, 2013. http://www.theses.fr/2013DENS0057/document.
Der volle Inhalt der QuelleIn the context of sustainable development, the study of cracking of large concrete structures has become of primary importance. Two levels of analysis appear: the structure scale and the crack scale. At the structural level, non-linear finite element analyses based on continuum damage mechanics can be carried out. Nevertheless, the use of such models requires the introduction of a characteristic length to prevent the occurrence of spurious mesh dependency in case of strain softening. This characteristic length tends to smooth the discontinuity and thus makes the study of the cracks harder. At the crack level, an explicit description of the crack can be achieved using discrete element methods. This way, the main failure mechanisms of quasi-brittle materials are recovered. But the mesh density required for such modeling is nevertheless prohibitive to treat a whole industrial structure. A non-intrusive technique is proposed, allowing the use of finite element models at a global scale and a decoupled local analysis of some interesting areas, i.e. around cracks, for which a discrete element model is used. Numerical results obtained from the proposed strategy are compared with experimental results and show the applicability of the approach. Several test cases are studied proving the capability of the approach to model the cracks propagation of loaded concrete structures. Specific concrete problems such as scale effect, 3D effect or rebars impact are addressed
Morice, Erwan. „Fissuration dans les matériaux quasi-fragiles : approche numérique et expérimentale pour la détermination d'un modèle incrémental à variables condensées“. Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2014. http://tel.archives-ouvertes.fr/tel-01048626.
Der volle Inhalt der QuelleTong, Yue. „Modélisation de l'endommagement et de la fissuration des matériaux fragiles cohésifs et des structures avec la méthode couplée de péridynamique et des éléments finis“. Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1I070.
Der volle Inhalt der QuelleMacroscopic failure in cohesive geological and cement-based materials and structures is generally a progressive process induced by the transition from diffuse micro-cracks to localized macro-fracturing. In spite of significant advances obtained, efficient modeling of this complex process is still an open issue. In this study, some new contributions are presented on modeling of progressive processes in cohesive rock-like and concrete materials and strtcures with a coupled peridynamics and finite element method. The first part is devoted to the description of tensile cracking behavior of cohesive brittle materials. A new bond damage model, composed of an exponential reduction term and a residual strength term, is proposed. Unlike the original bond model for elastic brittle materials, the new bond model is able to account for the progressive failure and residual strength of bonds. Based on the fracture energy concept, this new bond damage model is introduced into the framework of bond-based peridynamics theory. Moreover, in order to improve the computational efficiency of peridynamics modeling as a non-local theory, the coupled procedure with the finite element method is further proposed. The effectiveness of the proposed bond damage model is assessed by several benchmark tests concerning mode-I and mixed-mode fractures in concrete structures. In the second part, the new bond damage model is introduced to the framework of ordinary state-based peridynamics theory to overcome the limitations of bond-based peridynamics theory. For the purpose of further enhancing the computational efficiency, an adaptive coupling method is proposed for the combination of the state-based peridynamics theory and classical finite element method. The evolving boundary between cracking domain and the elastic one is taken into account. The accuracy of the new bond damage model implemented in the adaptive coupling method for modeling the progressive failure process in cohesive materials is clearly validated through a series of representative laboratory tests on concrete structures. The last part is devoted to exploring the applicability of peridynamics theory, as well as the new bond damage model, for dealing with progressive cracking problems in geotechnical engineering structures. Two typical galleries, related to the in-situ experiments carried out by French national radioactive waste management agency (ANDRA), are studied as examples to estimate excavation damage zones around underground constructions. And a self-established slope is also considered to analyze its instability induced by stacked loads at the top. Some concluding remarks and perspectives for future works are finally outlined
Bui, Huu phuoc. „Approche multi-échelle de la rupture des structures en béton : Influence des agrégats sur la longueur interne du matériau“. Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-01017092.
Der volle Inhalt der QuelleMichel, Yann. „Phénomène d'impact à haute vitesse sur cibles minces fragiles : application au projet de laser mégajoule et à la problématique des débris spatiaux“. Toulouse 3, 2007. http://www.theses.fr/2007TOU30034.
Der volle Inhalt der QuelleDue to its optical properties, glass is often essential for optical systems but its inability to undergo large deformations makes it particularly sensitive to high velocity impacts (HVI). The objective of this PhD consist in characterising and modelling damages and matter ejection induced by such impacts on thin monolithic targets (LMJ Disposable Debris Shields, DDS) or multilayered targets (solar cells). An important effort is dedicated to experimental activities including characterisation of fused silica behaviour under shock loadings and of damages induced by 3D HVI (VProj £ 3. 5km/s) on thin brittle targets. SEM and metrological analyses of impacted targets as well as innovating characterisation methods of ejected clouds allowed a better understanding of ejection processes. This phenomenological observation led to improvements of the LS-DYNA Johnson-Holmquist material model (JH-2). This modified model has been coupled with an SPH method and allows to reproduce effects of fragmentation and permanent densification under planar shock loadings. The 2nd part of this work presents the results of 3D modelling activity corresponding to CNES & CEA applications. It has been performed to assess ballistic performances (spallation & perforation), to reproduce damages and matter ejection observed on DDS and solar cells. 3D numerical simulations allowed to identify actual limitations of the code which provides satisfying results for damaging and ejection phenomenology for the range 0-5 km/s. The modelling tool has been used to predict ballistic limits and ejection tendencies due to impact on 2 mm DDS involving various projectiles (shape, material, velocity) in the validated range
Bui, Huu Phuoc. „Approche multi-échelle de la rupture des structures en béton : Influence des agrégats sur la longueur interne du matériau“. Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI070/document.
Der volle Inhalt der QuelleFor durability analysis and economic design (less material) of structures made of concrete-like materials, modeling of cracking process and failure is essential. In the framework of continuum mechanics, an internal length is introduced in nonlocal models to remedy the problem related to mesh sensitivity which is a pathology of classical damage models, when dealing with softening materials. However, the assessment of the internal length from heterogeneities of the material is still a difficult question, which makes an obscure issue in using nonlocal models. Our work concerns developing of a numerical tool based on the Lattice Element Method (LEM) which is a discrete model for simulating and predicting fracture in concrete(-like) material. Using the lattice model at the mesoscopic scale, there is no need to introduce any internal length in the constitutive law, as done in nonlocal models, and we can enfranchise this parameter by explicitly introducing the material mesotructure via geometric description. Based on the developed numerical tool, we studied, by performing numerical uniaxial tensile tests, the geometric influence of the material mesotructure as well as the influence of the boundary conditions and specimen sizes (that result in different stress gradient and material rotation field) on the size of the FPZ (Fracture Process Zone) and on the characteristic length of the homogenized quasi-brittle material. These studies provide recommendations/warnings when extracting an internal length required for nonlocal damage models from the material microstructure. Moreover, the studies contribute a direct insight into the mesoscale origin of the FPZ size and the material characteristic length, and consequently into the origin and nature of the nonlinear behavior of the material. Then, we implemented the lattice model into SOFA library developed by INRIA for realizing the coupling with the Finite Element Method (FEM) in order to deal with large-scale structures. We proposed a strong coupling algorithm between a macroscopic approach represented by FEM and a mesoscopic approach dealt by LEM within an adaptive manner. The coupling model is first used to validate the multiscale approach proposed on heuristic simulations. And in the long term, it provides a promising tool for simulations of large-scale structures made of quasi-brittle materials of real life
Bücher zum Thema "Nettoyage de structures fragiles"
International Union of Testing and Research Laboratories for Materials and Structures. Technical Committee 62 SCF. Soiling and cleaning of building facades: Report of Technical Committee 62 SCF, RILEM (the International Union of Testing and Research Laboratories for Materials and Structures). London: Chapman and Hall, 1988.
Den vollen Inhalt der Quelle findenOntario. Esquisse de cours 12e année: Sciences de l'activité physique pse4u cours préuniversitaire. Vanier, Ont: CFORP, 2002.
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Den vollen Inhalt der Quelle findenBuchteile zum Thema "Nettoyage de structures fragiles"
Villez, Alain. „Fragilité des structures innovantes“. In Les vieux sont-ils forcément fragiles et vulnérables ?, 269. ERES, 2019. http://dx.doi.org/10.3917/eres.eynar.2019.01.0269.
Der volle Inhalt der QuelleLORENTZ, Éric. „Modélisation de la rupture quasi fragile“. In Modélisation numérique en mécanique fortement non linéaire, 189–273. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9081.ch5.
Der volle Inhalt der QuelleBerichte der Organisationen zum Thema "Nettoyage de structures fragiles"
Aubry, Philippe, Nicolas Boileau, Marie Briandy, Marie-Christine Chauvat, Sandrine Conin und Éric Min-Tung. Rapport sur le chantier IdRef en Normandie. Normandie Université, Dezember 2023. http://dx.doi.org/10.51203/rapport.nu.000003.
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