Дисертації з теми "Soft surfaces"
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Chakrabarty, Souvik. "NOVEL SOFT SURFACES WITH INTERESTING SURFACE AND BULK MORPHOLOGY." VCU Scholars Compass, 2012. http://scholarscompass.vcu.edu/etd/397.
Повний текст джерелаKabiri, Farnaz Kabiri. "Gecko Adhesion on Soft Surfaces." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1516061596336554.
Повний текст джерелаPorter, Matthew Stanton. "Soft x-ray speckle from rough surfaces /." view abstract or download file of text, 2000. http://wwwlib.umi.com/cr/uoregon/fullcit?p9957568.
Повний текст джерелаTypescript. Includes vita and abstract. Includes bibliographical references (leaves 100-104). Also available for download via the World Wide Web; free to University of Oregon users. Address: http://wwwlib.umi.com/cr/uoregon/fullcit?p9957568.
Welsch, Nicole. "Interactions of proteins with soft polymeric surfaces." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2012. http://dx.doi.org/10.18452/16633.
Повний текст джерелаIn the present work the thermodynamics and the kinetic mechanism of protein adsorption to charged and uncharged core-shell microgels of colloidal dimension were explored. The soft polymeric layer of the shell is sensitive towards changes of the temperature, pH value, and salt concentration of the solution which results in a drastic volume change upon change of one of these triggers. Studies with Fourier-transform infrared (FT-IR) spectroscopy showed, that the secondary structure of the proteins used was significantly retained after immobilisation regardless of the charge state of the microgels employed. Moreover, unlike protein adsorption onto solid surfaces immobilisation into the networks did not compromise the catalytic activity of the proteins. Actually, an enhanced activity was found for some cases. The thermodynamic analysis performed by isothermal titration calorimetry (ITC) and structural investigations by FT-IR spectroscopy experiments led to the identification of the electrostatic and hydrophobic interactions as the main driving forces of protein adsorption. Further studies showed that proteins bound to negatively charged gel networks regulate their charge according to the electrostatic potential and to the lowered local pH value around the hydrogels. Fluorescence spectroscopy experiments with fluorescent-tagged proteins were suitable to analyse the kinetic uptake of the proteins into the gel networks as well as the reversibility of binding. It was demonstrated that bound proteins are dynamically exchanged by proteins in solution which justifies the application of equilibrium binding models to quantify the adsorption data. Moreover, the adsorption of proteins proceeds in two steps: i) a fast, diffusion-limited binding regime in which the majority of proteins is bound and ii) a second slow binding regime. The adsorption experiments were extended to binary protein mixtures in order to study competitive protein adsorption.
Shirafkan, Abbas. "Wettability and hydrophilicity of rigid and soft contact lens surfaces." Thesis, City University London, 1997. http://openaccess.city.ac.uk/8385/.
Повний текст джерелаKargar, Mehdi. "Controlling Microbial Adhesion to the Surfaces Using Topographical Cues." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/42771.
Повний текст джерелаMaster of Science
Lahrashe, Moktar. "Atomic force microscopy of soft surface : Characterisation of holographic optical elements." Université Louis Pasteur (Strasbourg) (1971-2008), 2005. http://www.theses.fr/2005STR13046.
Повний текст джерелаDriven largely by the needs for advanced lithographic processes surface measurement methods have significantly advanced in the last decade. The aim of this thesis is to apply recently developed measuring techniques to the specific problem of investigating the surface structure of holographic recording gratings. At the start of thesis, search for relevant literature was given high priority, with the purpose to find the best measuring device suitable for this investigation. The device chosen was an atomic force microscope (AFM) which is a tool that enables the spatially localised measurements with unprecedented resolution. AFM provides high-resolution imaging of surface structures from few nanometres to hundreds of micrometres. This capability is useful for quantitative analysis of surface micro-roughness of technological surfaces with high sensitivity and accuracy. Various holographic gratings are studied, along with the sequence by which raw images are analysed for grating profile, profile consistency, grating depth, profile roughness and elastic modulus. In addition, AFM probing of subsurface structures has been achieved for holographic samples with gelatine - like top layers. The AFM characterisation is completed with optical characterisation of holographic gratings: i. E. The refractive index, the refractive index modulation, the groove period, the emulsion thickness and the absorption and the scattering losses are determined by this method
Yarlagadda, Sri Charan. "Dynamics of hard and soft colloids in confined geometries and on structured surfaces." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53888.
Повний текст джерелаVolný, Michael. "Reactive and soft landing of polyatomic gas-phase ions on plasma-treated metal surfaces /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/8650.
Повний текст джерелаKoller, Anton W. "The friction coefficient of soft contact lens surfaces in relation to comfort and performance." Thesis, City University London, 2014. http://openaccess.city.ac.uk/13791/.
Повний текст джерелаSupreeti, Shraddha [Verfasser], Stefan [Akademischer Betreuer] Sinzinger, Martin [Akademischer Betreuer] Hoffmann, and Steffen [Akademischer Betreuer] Strehle. "Soft nanoimprint lithography on curved surfaces / Shraddha Supreeti ; Stefan Sinzinger, Martin Hoffmann, Steffen Strehle." Ilmenau : TU Ilmenau, 2021. http://d-nb.info/1239051182/34.
Повний текст джерелаLiu, Zhiqiang. "Modelling and experimental studies of contact and friction of metallic rough surfaces in initial sliding." Thesis, Heriot-Watt University, 2001. http://hdl.handle.net/10399/542.
Повний текст джерелаChen, S. "An experimental investigation of drop impact phenomena with complex fluids on heated and soft surfaces." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3011893/.
Повний текст джерелаLi, Wanbo. "Rapid and low-cost mass fabrication of true three-dimensional hierarchical structures with dynamic soft molding and its application in affordable and scalable production of robust and durable whole-teflon superhydrophobic coating." HKBU Institutional Repository, 2019. https://repository.hkbu.edu.hk/etd_oa/611.
Повний текст джерелаWedler, Nils David [Verfasser], and C. [Akademischer Betreuer] Barner-Kowollik. "Dynamic Bonding in Soft Matter Materials and on Surfaces / Nils David Wedler ; Betreuer: C. Barner-Kowollik." Karlsruhe : KIT-Bibliothek, 2017. http://d-nb.info/1126036900/34.
Повний текст джерелаSong, Sukho. "Soft Robotic Grippers Using Gecko-Inspired Fibrillar Adhesives for Three-Dimensional Surface Grasping." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/936.
Повний текст джерелаWelsch, Nicole [Verfasser], Matthias [Akademischer Betreuer] Ballauff, and Nikolaus P. [Akademischer Betreuer] Ernsting. "Interactions of proteins with soft polymeric surfaces : driving forces and kinetics / Nicole Welsch. Gutachter: Matthias Ballauff ; Nikolaus P. Ernsting." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2012. http://d-nb.info/1029141150/34.
Повний текст джерелаSabiri, Noura. "Caractérisation du toucher des surfaces polymères, essais de corrélation entre analyse sensorielle : Mise au point d'un matériau à toucher "soft"." Paris, CNAM, 2008. http://www.theses.fr/2008CNAM0624.
Повний текст джерелаAux différents cirtères tels que durabilité et confort, toujours pris en compte pour l'achat d'un véhicule, viennent maintenant s'ajouter des critères dedimensions sensorielles comme l'odorat et le toucher. C'est sur l'évlauation de ce dernier cirtère qu'a porté notre étude. Les matières plastiques étant largement utilisées dans l'habitacle automomobile, c'est à leur toucher quue nous nous intéressons particulièrement. Actuellement, seule l'analyse sensorielle permet de carctériser le toucher, mais cette analyse est particulièrement difficile à mettre en oeuvre. C'est pourquoi, nous essayons d'évaluer le toucher à l'aide de mesures physiques adaptées telles que des essais de frottement et de rugosité. La première partie de ce travail consiste tout d'abord à s'assurer de la fiabilité des résultats de l'analyse sensorielle en se basabt sur des critères précis (répétabilité, cohérence, finesse d'analyse), Nous déterminons ensuite le coefficient de frottement et la rugisité de surface d'échantillons variés. Cette étude est précédée par une démarche statistique ayant pour but d'étudier la fiabilité de processus de mesure. Puis, nous essayons d'établir une corrélation entre les résultats de l'analyse sensorielle pour les descripteurs "Glissant" et "Râpeux" et les résultats de mesures physiques associées. Dans la deuxième partie, nous présentons une étude sur l'amélioration du toucher des matériaux à bas de polypropylène utilisés dabs les piéces d'intérieur automobile. L'objectif est ici d'obtenir un matériau à toucher "soft" pour remplacer des pièces revêtues de peinture "soft", tout en gardant les propriétés mécaniques exigées par le cahier des charges
Rios, Neyra César. "Design of mechanoresponsive surfaces and materials." Thesis, Strasbourg, 2013. http://www.theses.fr/2013STRAE019/document.
Повний текст джерелаThe goal of my PhD was to develop new routes to design chemo-mechanoresponsive materials, materials that respond chemically to a mechanical stress, in a reversible way. All the systems designed during my PhD thesis were based on the functionalization of silicone sheets. First we created cryptic site surfaces by embedding biotin ligands into PEG brushes. The couple streptavidin/biotin was used as a model system. At rest, the surface so-prepared was antifouling and biotin ligands were specifically recognized by the streptavidin when the surface was stretched at 50%. Unfortunately, in this first approach, the mechanosensitive surface did not lead to a reversible process. In a second approach, we modified the silicone surface by using the polyelectrolyte multilayer (PEM) film deposition. This strategy was based on the covalent cross-linking of modified enzyme, the β-galactosidase, into the PEM. We succeeded in modulating the enzyme activity in the film under stretching and this approach appears as partially reversible under stretching/unstretching cycles. This work represents the first reported system where enzymatic activity can be modulated by stretching due to modulation of the enzyme conformation. In a last approach, we also designed a mixed system consisting of a silicone sheet onto which a polyacrylamide hydrogel is covalentlyattached with the goal to create a stretchable gel into which one can covalently attach enzymes or chemical mechanophores. These enzymes or mechanophores can thus be put under mechanical stress. We succeeded in creating a system that can be stretched up to 50% without detachment of the gel from the silicone and without inducing cracks in the gel
Dupont, Samuel James. "Shape-Shifting Surfaces for Rapid Release and Direct Stamping of Organized Micro-Tissues." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4310.
Повний текст джерелаStreubel, Robert. "Imaging Spin Textures on Curved Magnetic Surfaces." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-178266.
Повний текст джерелаOne of the foci of modern materials sciences is set on expanding conventional two-dimensional electronic, photonic, plasmonic and magnetic devices into the third dimension. This approach provides means to modify conventional or to launch novel functionalities by tailoring curvature and three-dimensional (3D) shape. The degree of effect is particularly high for vector properties like the magnetization due to an emergent inversion symmetry breaking. Aside from capabilities to design and synthesize 3D magnetic architectures, proper characterization methods, such as magnetic tomographic imaging techniques, need to be developed to obtain a thorough understanding of the system’s response under external stimuli. The main objective of this thesis is to develop a visualization technique that provides nanometer spatial resolution to image the peculiarities of the magnetic domain patterns on extended 3D curved surfaces. The proposed and realized concept of magnetic soft X-ray tomography (MXT), based on the X-ray magnetic circular dichroism (XMCD) effect with soft X-ray microscopies, has the potential to become a powerful tool to investigate element specifically an entirely new class of 3D magnetic objects with virtually any shape and magnetization. Imaging curved surfaces meets the challenge of three-dimensionality and requires a profound understanding of the recorded XMCD contrast. These experiences are gained by visualizing magnetic domain patterns on two distinct 3D curved surfaces, namely magnetic cap structures and rolled-up magnetic nanomembranes with cylindrical shape. The capability of MXT is demonstrated by reconstructing the magnetic domain patterns on 3D curved surfaces resembling hollow cylindrical objects
Katakam, Shravana K. "Laser Surface Treatment of Amorphous Metals." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc500194/.
Повний текст джерелаBenkoula, Safia. "Étude de la structure, des propriétés de surface et de la réactivité de nanoparticules isolées par spectroscopie de photoélectrons par rayonnement synchrotron dans le domaine des rayons X-mous." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS219/document.
Повний текст джерелаDuring the past decade, a world-wide industrial expansion of nanosystems has been taking place at the junction between fundamental and applied sciences. Among these nanosystems, clusters, defined as small particles whose constitution ranges from few atoms (or molecules) to several thousand units, constitute "the missing link" between the isolated atom and the bulk solid. Studying the interactions in the aggregates would allow to understand how the atom is influenced by its neighborhood when it is included in a dense system within other atoms. "Nanoparticle" (NP) is usually defined as a system extanding from several thousands to millions of atoms, and its size is expressed in nanometer (nm, 1 nm = 10^{-9} m).This interest for nanosystems mainly results from their particular physical properties at the nanometer scale, but also from their large "surface to bulk" ratio. Hence, more active sites are available at the surface, enhancing their reactivity. This characteristic is used in numerous fields of applications (heterogeneous catalysis, cleanup, photovoltaics, nanomedicine).% and is also relevant in natural processes (atmospheric sprays, volcanic eruptions).This expansion of the "nanotechnological" activities involves the development of new methods for the characterization of these new kinds of materials, which take a considerable part in our daily life. Among the methods of matter characterization, synchrotron radiation based soft X-ray spectroscopy has shown to be a powerful technique for the study of atoms and molecules as well as materials, and appears today as an efficient technique of characterization in surface science.The idea of this thesis is to combine the atomic selectivity of the spectroscopy applied to dilute matter, with the surface sensitivity of soft X-ray spectroscopy, to study isolated nanosystems (clusters and NPs) in the gas phase, by XPS in the energy range of soft X-ray (typically 100 eV to 1000 eV). We present in this thesis the first results obtained by this approach at the PLEIADES beamline of SOLEIL synchrotron radiation facility. PLEIADES is a ultra-high resolution beamline dedicated to the study of dilute matter. The experiments carried out in this work relate to materials often used in the industrial and biomedical fields: TiO2 NPs, Silicon and glycosylated polystyrene NPs. We show how XPS on isolated NPs allows us to answer concrete questions, as the surface reactivity of the NPs, processes and oxidation dynamics, the doping efficiency or the interface ligand/NP. The results presented here not only show the feasibility of the method, but much more than that, prove that it is possible to give insight about surface chemical processes occuring on isolated, randomly oriented NPs
Zaafouri, Zaineb. "Modélisation de l'adsorption et du transport des surfactants en milieu poreux : influence de la thermodynamique et de la cinétique de l'adsorption." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALY041.
Повний текст джерелаThe adsorption of surfactant exhibits complex behavior related to lateral interaction and the formation of aggregates on the adsorbing surfaces. In this thesis, we propose a new model by using adsorption desorption ratio that are concentration dependent to account for the hindered or facilitated adsorption and a packing parameter to characterize the aggregated objects. The model was validated against experimental data and it proved its physical interest by obeying the quasi-chemical approximation. The numerical study of the interplay between adsorption and transport is of important interest for the industry. In this work, we perform a series of numerical simulation using LBM-TRT scheme to model the transport of passive and adsorbing tracer in simple and complex structure. The results in the parallel plates geometry proved that the Henry adsorption leads to a higher displacement and it leads to an over-adsorption when using high value of adsorption desorption ratio. While for the Langmuir model, results showed the importance of the value of the initial concentration. A high concentration values leads to change the transport regimes, by introducing an intermediate Taylor dispersion regime, before reaching the adsorption dispersion regime. The results in the porous geometry proved that transport in this geometry is highly affected by the heterogeneity of the structure; it showcases a non-stationary dispersive regime. As for the adsorption, it leads to a decrease in the displacement variance since it is hindered by the adsorption in the x-direction. Thanks to the surface saturation, the Langmuir adsorbing model, gives more dispersed molecules than the Henry adsorbing model within the geometry
Manuzon, Michele Yabes. "Investigation of Pseudomonas Biofilm Development and Removal on Dairy Processing Equipment Surfaces Using Fourier Transform Infrared (FT-IR) Spectroscopy." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1253576498.
Повний текст джерелаBodin, Audrey. "Un dispositif de filtre en énergie couplé à un spectromètre de masse quadrupolaire pour le dépôt d'ions moléculaires sur des surfaces isolantes avec énergie contrôlée." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2224/.
Повний текст джерелаMolecular electronics is an alternative technology for nanoelectronics. It requires the conception of new equipments in order to deposit large and fragile molecules on insulating surfaces under ultra high vacuum (UHV). Keeping intact the deposited molecules is essential for the functionality of the fabricated devices. The most generally used deposition technique for molecules under UHV is thermal evaporation. However, this technique is often detrimental for fragile molecules. The development of less destructive deposition methods is therefore needed. An alternative technique is based on the use of a dedicated mass spectrometer. The commercial device used for our study is a Finnigan triple quadrupole mass spectrometer TSQ700 coupled to a multi-chamber equipment under UHV called " Dinamo " UHV Factory. To transform the TSQ700 in a low energy ion source, we studied the energy distribution of the ions at the exit of the analyzer by using the simulation software SIMION(r). This study revealed that the ion beam displays a high energy tail up to 1500 eV. The ion beam must then be filtered in energy in order to remove the high energy tail. To filter the ions in energy, we decided to add an electrostatic sector. The ion current measured at the output of electrostatic sector showed that the high-energy tail has been removed after this modification. The modified spectrometer was used to deposit CF3+ ions on a KBr(001) surface then characterized by Non-Contact Atomic Force Microscopy (NC-AFM) and Kelvin Probe Force Microscopy (KPFM). KPFM observations are consistent with the presence of positive charges
Dika, Timbo Christelle. "Propriétés interfaciales des virus, concept de particules molles multicouches, corrélation avec les capacités d'adhésion." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0038/document.
Повний текст джерелаThe aim of this work is to characterize the interfacial properties of phages using the soft multilayer particles concept in order to interrelate appropriately their reactivity and their physico-chemical features. It was demonstrated that the RNA inside the capsid do have a major impact on the physico-chemical properties of the virus, in particular its electrophoretic mobility. We further compared electrohydrodynamic features of MS2 phage with those of the corresponding VLPs (virus particles without RNA). In line with theoretical predictions based on the soft particles concept, it is shown that MS2 are more negative than VLPs. The aggregation profiles of both particles significantly differ demonstrating the major influence of the genome on stability of viral suspensions. We then analyzed the influence of the virus purification method on the observed differences in terms of stability and electrohydrodynamics. We also studied the interfacial properties of phages exhibiting similar structures. It appeared that the phages display similar electrostatic charge while their hydrophobicity degree follows the sequence MS2
Hazell, Gavin D. A. "Surface scattering from soft matter at interfaces." Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.642031.
Повний текст джерелаKehl, Catherine Eliza. "Soft Surface Grasping: Radular Opening in Aplysia Californica." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1544204621730828.
Повний текст джерелаArnab, Sylvester. "Soft volume simulation using a deformable surface model." Thesis, University of Warwick, 2009. http://wrap.warwick.ac.uk/1932/.
Повний текст джерелаGuttag, Mark A. (Mark Andrew). "Tunable surface topographies via particle-enhanced soft composites." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/97851.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 75-76).
We introduce a new class of particle-enhanced soft composites (PESC) that can generate, on demand, custom and reversible surface topographies, with surface features that can be highly localized. These features can be specifically patterned or alternatively can be random in nature. Our PESC samples comprise a soft elastomeric matrix with stiff particles embedded below the surface. The surfaces of the samples presented in this thesis are originally smooth and flat but complex morphologies emerge under application of a stimuli (here we show application of primarily compressive loading). We demonstrate these adaptive surface topographies with both physical experiments and finite element simulations which are used to design and to study the mechanical response. A variety of different surface patterns can be attained by tailoring different dimensionless geometric parameters (e.g. different particle sizes, shapes, and distributions), as well as material properties. The design space of the system and the resulting surface topographies are explored and classified systematically. Given that our method depends primarily on the geometry of the particle arrays, our mechanism for on-demand custom surface patterning is applicable over a wide range of length scales. These surfaces can be used in a variety of different applications including control of fluid flow, adhesion, wettability and many others.
by Mark A. Guttag.
S.M.
Nesser, Manar. "Influence of laser treatment with long, short, or ultra-short pulse duration on the magnetic properties and the domain structure of grain-oriented Iron-Silicon steels." Electronic Thesis or Diss., Amiens, 2021. http://www.theses.fr/2021AMIE0026.
Повний текст джерелаPulsed laser technology is one of the productive solutions adopted to optimize the electromagnetic properties of certain electrical steels. However, its industrial application on different alloys, thicknesses, or applications remains restricted. Moreover, the deterministic impact of this technique on the magnetic structure of a material and its performance requires deep investigation. Further, the ultra-short pulsed laser ablation technique remains unfamiliar for electrical steels although it represents a vital potential in terms of a repeatable process that withstands high temperatures. The main intention of the thesis is to study the influence of surface laser treatments on the magnetic properties of grain-oriented silicon iron electrical steels in order to improve their performance. A classification of the different laser processes is proposed according to the pulse duration, repetition frequency, power, and laser fluence. Accordingly, three types of treatments are selected: irradiation, scribing, and ablation, with a particular emphasis on the ablation process. Remarkably, the principal criterion analyzed was the energy conversion efficiency (i.e. especially iron losses). On that account, the impact of these laser processes is studied using dynamic magnetization and loss models, identified by magnetic measurements with an SST "Single Sheet Tester" bench. Then, an optimization of the laser ablation parameters is carried out to ensure a reduction in iron losses of around 20% while maintaining the apparent permeability at certain operating points (medium and high inductions at 50 Hz and low inductions up to 5000 Hz). An additional study on two different grades of FeSi GO (conventional 0.23 mm and HiB 0.28 mm) permitted the adaptation of the laser parameters and patterns with the material thickness. Spectacularly, the ablation process has shown more resistance to a higher temperature than other processes. Furthermore, a correlation between the optical energy parameters (pulse energy, cumulative energy density, and peak power density), the patterns and laser impacts (groove depth, heat affected zone, induced thermal stress), and the identified magnetic parameters (Bertotti coefficients; Lambda model parameters) is presented. This study reveals some physical interpretations.Besides, the effect of surface laser treatments on the magnetic domain structure has been analyzed. We visualized the changes in magnetic domains with Magneto-optical images using the MOIF technique (Magneto-Optical Indicator Film) for an overview of the domains between the laser lines with a resolution of about 20 µm. Following this, more precise observations with a horizontal resolution of the order of 100 nm were performed using the Magnetic Force Microscope (MFM), which shows the structural details in the vicinity and in the laser tracing line. To conclude, an optimization of the laser ablation parameters is accomplished ensuring an iron loss reduction at 50 Hz with more than 30% for an induction 0.5 T, and a percentage of 15% for an induction above 1.5 T. At higher frequencies and for 0.1 T, the reduction percentage can exceed the 30%. Concurrently, the apparent permeability can either be enhanced below 1.2 T (saturation inclination) or slightly reduced between 1.2 T and saturation. Anyhow, the polarization J800 > 1.70 T (conventional GO) and J800 > 1.80 T (GO HiB) under a magnetic field of 800 A/m will be guaranteed after laser treatment
Zareeipolgardani, Bahareh. "Surface reactivity of soft minerals at the atomic scale." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1018/document.
Повний текст джерелаIdentifying reaction mechanisms of minerals is fundamental to understand diagenesis, i.e, sedimentary rock formation, construction material, like cement or gypsum, hardening, and biomineralization. The macroscopic reaction rates of minerals are generally deduced from solution chemistry measurements. Beside the measurement of macroscopic reaction rates, the study of the reactivity of minerals includes now the investigation of the atomic mechanisms involved in the reactions. This has been made possible for two decades by the use of tools resolving nanometric objects, such as vertical scanning interferometry (VSI) and atomic force microscopy (AFM). Gypsum and calcite are among soft minerals. They are extremely widespread mineral that can be found naturally in sedimentary rocks. They are also used in many industrial fields. Gypsum (CaSO4,2H2O) is an evaporate mineral. Gypsum uses include: manufacture of wallboards, plaster of Paris, soil conditioning, and hardening retarder in Portland cement. Varieties of gypsum known as "satin spar" and "alabaster" are used for a variety of ornamental purposes; however, their low hardness limits their durability. Calcite, the most stable crystalline form of CaCO3, is moreover important as a bio-mineral and a major constituent of host rock in carbonate reservoirs, which host drinking water and natural oil and gas. When biological organisms grow their shells, they control the crystal morphology, size, orientation and even the crystal phase of precipitated calcium carbonate. This results in materials with physical and chemical properties that differ significantly from those of inorganically precipitated calcite. Gaining more insight into the surface reactivity of calcite and the effect of surface impurities will bring us one step closer to being able to synthesize biomimetic material, which mimic the properties of biogenic calcite. In this thesis, I had three main focus points. In the first part I studied the effect of stress on the dissolution mechanisms. I investigated to deduce the dissolution rate from the atomic kinetics. The second and the most extensive was the study of the influence of stress on the calcite growth and probing the role of an organic additive on the dynamics of calcite growth while applying stress. In the third part I emphasised on quantitative topographic measurements of dissolving calcite crystal over a relatively large and fixed view at vast range of pH. I considered the influence of an organic additive on the dissolution and surface reaction kinetics at this larger scale. Both macroscopic and microscopic dissolution rates can also be deduced from the dynamics of molecular events (etch pit growth, atomic step migration), but they hardly ever agree, even qualitatively, and the elaboration of a general theory linking the kinetics at the two scales is still in progress. I presented here microscopic dissolution rates of gypsum, measured by atomic force microscopy (AFM), in quantitative agreement with macroscopic rates. This agreement has been obtained in taking care to neutralize the bias induced by the force applied by the AFM tip on the surface, and to identify clearly the driving molecular mechanism. The force applied by the AFM tip on the surface has been seen to increase the solubility of the mineral, thereby introducing a bias, so I have always worked with a constant and low applied force. This result shows that the determination, among the topographic changes during the dissolution of a mineral, of the dominant one, and the measurement of its dynamics, may permit deducing from AFM experiments a reliable macroscopic dissolution rate. The transformation of loose grains into a cohesive solid requires the crystallites to grow eventually constrained by the surrounding grains. Whereas never measured, this confinement and the associated stress is expected to influence noticeably the growth, and the final properties of the material… [etc]
Levitt, Nicholas Paul. "Heterogeneous organic acid uptake on soot surfaces." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1235.
Повний текст джерелаBalog, Richard. "Low energy electrons as a soft tool for surface modification." [S.l. : s.n.], 2004. http://www.diss.fu-berlin.de/2004/263/index.html.
Повний текст джерелаPihan, Sascha Alexander [Verfasser]. "Surface and bulk properties of soft nanocomposites / Sascha Alexander Pihan." Siegen : Universitätsbibliothek der Universität Siegen, 2011. http://d-nb.info/1017706220/34.
Повний текст джерелаGreenwood, Jedediah Drury 1977. "Three-dimensional analysis of surface settlement in soft ground tunneling." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29558.
Повний текст джерелаIncludes bibliographical references (leaves 78-80).
A parametric study was performed to evaluate the effects of different construction variables on surface settlements above tunnels in soft ground. The finite element program "PLAXIS 3D Tunnel" was used to carry out the numerical analysis for the earth pressure balance (EPB) shield tunneling method in a saturated, normally consolidated clay. The two construction parameters that were varied were the face pressure and the grout pressure. Longitudinal settlement profiles were obtained for many different face pressures and several different grout pressures. Results show that the ground surrounding the tunnel is very sensitive to changes in grout pressure in terms of surface settlement and failure of the soil body, while a wide range of face pressures can be accommodated without failure. Furthermore, minimum surface settlement is achieved for a certain face pressure and becomes larger as the pressure is increased or decreased from that particular value, which for this analysis corresponded to an overload factor of one. Also, results show that surface settlement decreases with increasing grout pressure, as expected.
by Jedediah Drury Greenwood.
M.Eng.
Kurt, Pinar. "Biotesting and Surface Science of Polyurethanes with Novel Soft Blocks." VCU Scholars Compass, 2007. http://scholarscompass.vcu.edu/etd_retro/13.
Повний текст джерелаStromback, Anna Christina. "A sub-surface evaluation of the Weissliegend facies, UK, southern North Sea." Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250239.
Повний текст джерелаCanning, Gregory William. "Soft X-ray spectroscopic studies of surface films from oil additives." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ39807.pdf.
Повний текст джерелаHoffmann, William Darryle. "Study of Novel Ion/surface Interactions Using Soft-landing Ion Mobility." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc177214/.
Повний текст джерелаHenry, Kevin C. "Soft surface roll mechanics parameters for light vehicle rollover accident reconstruction /." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2024.pdf.
Повний текст джерелаHenry, Kevin Claude. "Soft Surface Roll Mechanics Parameters for Light Vehicle Rollover Accident Reconstruction." BYU ScholarsArchive, 2007. https://scholarsarchive.byu.edu/etd/1436.
Повний текст джерелаPottier, Basile. "Les fluctuations de surface pour mesurer les propriétés de systèmes complexes en l'absence de sollicitation." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00936208.
Повний текст джерелаWelch, Kyle. "Emergent thermodynamics in a system of macroscopic, chaotic surface waves." Thesis, University of Oregon, 2016. http://hdl.handle.net/1794/20694.
Повний текст джерелаSchwaab, Daniel. "Surface patterning by means of soft lithography for molecular and bio-electronics." Jülich : Forschungszentrum, Zentralbibliothek, 2007. http://d-nb.info/987853880/34.
Повний текст джерелаMirano, Geronimo (Geronimo J. ). "Jacobian-based control of soft robots for manipulation using implicit surface models." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113126.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (page 47).
Soft robot hands offer numerous advantages over rigid ones for manipulation, including robustness and safety. Yet, compared to rigid robots, soft robots are characterized by continuous mechanics, and finite-element approximations with many degrees of freedom present a significant obstacle for modern control approaches. The central question my thesis explores is whether we can capture the benefits of soft robot hands with relatively simple dynamical models. Specifically, we demonstrate a very simple model of a 2D soft manipulator that uses pulleys and cables to model deformable surfaces. This model captures much of the qualitative behavior of soft membranes, while also proving amenable to modern control techniques. We validate this model physically using a hardware set-up. We then demonstrate a simple quasi-static Jacobian controller which solves a second-order cone program to achieve the task of in-hand object repositioning.
by Geronimo Mirano.
M. Eng.
Ahmadi, Mojtaba. "Mechanics of Surface Instabilities of Soft Nanofibers and Nonlinear Contacts of Hydrogels." Diss., North Dakota State University, 2020. https://hdl.handle.net/10365/31861.
Повний текст джерелаHaguet, Julie. "Gliding of a way soft elastomer on a lubricated hard glass surface." Grenoble INPG, 2010. http://www.theses.fr/2010INPG0162.
Повний текст джерелаPrefillable syringes for the pharmaceutical industry are made of different kinds of materials which can have undesirable interactions with the medicinal solutions present inside the syringe barrel. When a plunger stopper glides inside a syringe barrel, the materials used and the geometry of the different elements influence the gliding mechanics. The study of the gliding of a wavy elastomeric plunger stopper inside a siliconized glass barrel has been done. The influence of various parameters on the gliding forces, as the viscosity and the quantity of the lubricant, and the nature of the elastomer has been studied. This experimental study has been coupled to a modelization which has enabled to emphasize some critical parameters that govern the general shape of a gliding curve as the deformation of the stopper and the shear of the silicone oil. A necessary condition to obtain an activation peak for the gliding curves is to have a friction coefficient that follows a Stribeck-like variation
Tian, Yuan TIAN. "How to Measure Work of Adhesion and Surface Tension of Soft Materials." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1523295919890025.
Повний текст джерела