Bibliografías temáticas / Surface characterizations

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Literatura académica sobre el tema "Surface characterizations"

Autor: Grafiati
Publicado: 25 de mayo de 2024
Última modificación: 19 de octubre de 2024

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Artículos de revistas sobre el tema "Surface characterizations"

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MALGOUYRES, RÉMY y GILLES BERTRAND. "COMPLETE LOCAL CHARACTERIZATION OF STRONG 26-SURFACES: CONTINUOUS ANALOGS FOR STRONG 26-SURFACES". International Journal of Pattern Recognition and Artificial Intelligence 13, n.º 04 (junio de 1999): 465–84. http://dx.doi.org/10.1142/s0218001499000288.

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In Ref. 6, two similar characterizations of discrete surfaces of ℤ3 are proposed which are called strong 18-surfaces and strong 26-surfaces. The proposed characterizations consist in some natural global properties of surfaces. In this paper, we first give local necessary conditions for an object to be a strong 26-surface. An object satisfying these local properties is called a near strong 26-surface. Then we construct continuous analogs for near strong 26-surfaces and, using the continuous Jordan Theorem, we prove that the necessary local conditions previously introduced in fact give a complete local characterization of strong 26-surfaces: the class of near strong 26-surfaces coincides with the class of strong 26-surfaces.
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Wang, Jingyu, Min Gao, Yonglin He y Zhilin Yang. "Ultrasensitive and ultrafast nonlinear optical characterization of surface plasmons". APL Materials 10, n.º 3 (1 de marzo de 2022): 030701. http://dx.doi.org/10.1063/5.0083239.

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Amid the rapid development of nanosciences and nanotechnologies, plasmonics has emerged as an essential and fascinating discipline. Surface plasmons (SPs) lay solid physical foundations for plasmonics and have been broadly applied to ultrahigh-resolution spectroscopy, optical modulation, renewable energy, communication technology, etc. Sensitive optical characterizations for SPs, including far/near-field optics, spatial-resolved spectroscopy, and time-resolved behaviors of SPs, have prompted intense interest in diverse fields. In this Research Update, the ultrasensitive optical characterization for sub-radiant SPs is first introduced. Then, distinct characterization methods of nonlinear plasmonics, including plasmon-enhanced second harmonic generation and plasmon-enhanced sum frequency generation, are demonstrated in some classical nanostructures. Transient optical characterizations of SPs are also demonstrated in some well-defined nanostructures, enabling the deep realization of time-resolved behaviors. Finally, future prospects and efforts of optical characterization for SPs are proposed.
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3

Liu, Xiao, Fan Yang, Maokun Li y Shenheng Xu. "Generalized Boundary Conditions in Surface Electromagnetics: Fundamental Theorems and Surface Characterizations". Applied Sciences 9, n.º 9 (8 de mayo de 2019): 1891. http://dx.doi.org/10.3390/app9091891.

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Generalized boundary conditions (GBCs) for electromagnetic surfaces are investigated in this paper, which can be used to analytically characterize field discontinuities across two-dimensional surfaces. First, five representative features are described to categorize various surface problems which require proper GBC-based characterization procedures. Next, the generalized boundary conditions are discussed in details, in association with impedance boundary conditions, generalized sheet transition conditions, and surface scattering coefficients. Then an extraction method for surface susceptibilities, the characteristic parameters of surfaces in GBCs, are proposed and validated. Finally, to illustrate the applications of GBCs, two representative surface problems are demonstrated, namely, isolated-aperture surface analysis and surface-wave mode characterization. For the isolated-aperture surface, a characterization procedure is derived based on GBCs and Babinet’s principle, and the accuracy is validated through comparison with full-wave simulations. For surface wave analysis, a characterization procedure is also developed from GBCs, and the feasibility is verified by numerical examples as well.
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Önder, Mehmet y H. Hüseyin Uğurlu. "Some Results and Characterizations for Mannheim Offsets of the Ruled Surfaces". Boletim da Sociedade Paranaense de Matemática 34, n.º 1 (1 de enero de 2016): 85–98. http://dx.doi.org/10.5269/bspm.v34i1.24756.

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In this study, we give the dual characterizations of Mannheim offsets of ruled surfaces in terms of their integral invariants and obtain a new characterization of the Mannheim offsets of developable surface, i.e., we show that the striction lines of developable Mannheim offset surfaces are Mannheim partner curves. Furthermore, we obtain the relationships between the area of projections of spherical images for Mannheim offsets of ruled surfaces and their integral invariants.
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Birman, Graciela S. y Graciela M. Desideri. "A surface that contains many Lorentzian circles". Proceedings of the Edinburgh Mathematical Society 53, n.º 2 (30 de abril de 2010): 293–98. http://dx.doi.org/10.1017/s0013091508000382.

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AbstractThe characterization of a surface by means of the circles contained in it has been studied by S. Izuyima, A. Takiyama, K. Ogiu, R. Takagi and N. Takeuchi, among others. The aim of this paper is to show some characterizations of a pseudosphere in Lorentz 3-space, assuming the existence of Lorentzian and Euclidean circles.
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6

Russ, John C. "Characterization of Surface Roughness". Microscopy and Microanalysis 6, S2 (agosto de 2000): 916–17. http://dx.doi.org/10.1017/s1431927600037077.

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Because of the session at this Microscopy and Microanalysis 2000 meeting concerned with the microanalysis of irregular surfaces, it seems appropriate to briefly review the methods used for the characterization of rough surfaces. This includes both mathematical tools for the concise description of surface roughness, and instruments used to acquire the necessary data. These methods are widely used in industry to characterize and specify the roughness of surfaces prepared by various machining, grinding, polishing, chemical etching, and physical and chemical deposition techniques, and to correlate the surface roughness with performance.Historically, surface roughness has been measured by performing a linear traverse with a mechanical stylus that is sensitive to vertical displacements of nm but with a lateral resolution on the order of pm, which is quite similar to the dimensions of the region analyzed by X-ray microanalysis. Recently, more comprehensive characterizations have been obtained using a raster scan over surface areas.
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Bartkowiak, Tomasz, Johan Berglund y Christopher A. Brown. "Multiscale Characterizations of Surface Anisotropies". Materials 13, n.º 13 (7 de julio de 2020): 3028. http://dx.doi.org/10.3390/ma13133028.

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Anisotropy can influence surface function and can be an indication of processing. These influences and indications include friction, wetting, and microwear. This article studies two methods for multiscale quantification and visualization of anisotropy. One uses multiscale curvature tensor analysis and shows anisotropy in horizontal coordinates i.e., topocentric. The other uses multiple bandpass filters (also known as sliding bandpass filters) applied prior to calculating anisotropy parameters, texture aspect ratios (Str) and texture directions (Std), showing anisotropy in horizontal directions only. Topographies were studied on two milled steel surfaces, one convex with an evident large scale, cylindrical form anisotropy, the other nominally flat with smaller scale anisotropies; a µEDMed surface, an example of an isotropic surface; and an additively manufactured surface with pillar-like features. Curvature tensors contain the two principal curvatures, i.e., maximum and minimum curvatures, which are orthogonal, and their directions, at each location. Principal directions are plotted for each calculated location on each surface, at each scale considered. Histograms in horizontal coordinates show altitude and azimuth angles of principal curvatures, elucidating dominant texture directions at each scale. Str and Std do not show vertical components, i.e., altitudes, of anisotropy. Changes of anisotropy with scale categorically failed to be detected by traditional characterization methods used conventionally. These multiscale methods show clearly in several representations that anisotropy changes with scale on actual surface measurements with markedly different anisotropies.
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Ghassa, Sina, Hadi Abdollahi, Mahdi Gharabaghi, Saeed Chehreh Chelgani y Mohammad Jafari. "The Surface Chemistry Characterization of Pyrite, Sphalerite and Molybdenite after Bioleaching". Solid State Phenomena 262 (agosto de 2017): 487–91. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.487.

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The mineral surface chemistry characterization is essential to describe the dissolution kinetics in leaching and bioleaching. Five different methods, including X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDS), Fourier Transform Infrared Spectroscopy (FTIR) and Raman Spectroscopy, have been applied to study the surface chemistry changes during pyrite, sphalerite and molybdenite bioleaching. The surface characterizations have been done for samples before and after biological and chemical leaching. The SEM images illustrated that the minerals surfaces were smooth before processing, while they covered with an ash layer after biological treatment. Although EDS analysis and Raman spectrum demonstrated the potassium jarosite formation on the pyrite surface during bioleaching, the formation of jarosite layer did not occur on the sphalerite surfaces during bioleaching. On the other hand, a sulfur layer formation on the sphalerite surface was confirmed by mentioned characterization methods. Finally, according to the XRD and EDS spectrum the molybdenite surface had been covered both with sulfur and jarosite.
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Önder, Mehmet y H. Hüseyin Uğurlu. "On the invariants of Mannheim offsets of timelike ruled surfaces with spacelike rulings". Asian-European Journal of Mathematics 08, n.º 01 (marzo de 2015): 1550009. http://dx.doi.org/10.1142/s1793557115500096.

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In this paper, we give the characterizations for Mannheim offsets of timelike ruled surfaces with spacelike rulings in dual Lorentzian space [Formula: see text]. We obtain the relations between terms of their integral invariants and also we give new characterization for the Mannheim offsets of developable timelike ruled surface. Moreover, we find relations between the area of projections of spherical images for Mannheim offsets of timelike ruled surfaces and their integral invariants.
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10

Poirson, Allen B., Brian A. Wandell, Denise C. Varner y David H. Brainard. "Surface characterizations of color thresholds". Journal of the Optical Society of America A 7, n.º 4 (1 de abril de 1990): 783. http://dx.doi.org/10.1364/josaa.7.000783.

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Tesis sobre el tema "Surface characterizations"

1

Murauski, Anatoli. "Surface and liquid crystal interlayer interactions : characterizations and applications /". View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20MURAUS.

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Po, Jiunn Hong. "Synthesis and characterizations of 2D nanoparticles with controlled folding for circularly polarized optical properties". Electronic Thesis or Diss., Université Paris sciences et lettres, 2023. http://www.theses.fr/2023UPSLS047.

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Appartenant aux semi-conducteurs II-VI, les nanoplaquettes de chalcogénure de cadmium présentent des caractéristiques optiques fines dans la région visible. Ces particules peuvent mesurer jusqu'à des centaines de nanomètres en longueur et en largeur, tout en présentant quelques nanomètres le long de leur dimension d'épaisseur sous confinement quantique. Lors de la fonctionnalisation des ligands en surface sur ces nanofeuillets ultrafins, des corps sous contrainte résiduelle sont créés. Cela provient du désaccord entre le réseau cristallin inorganique et la couche d'ancrage des atomes, en plus de la répulsion stérique induite par les chaînes aliphatiques. Ces trois composants agissants sont capturés via une analyse mécanique quantitative pour aboutir à un modèle permettant de prédire l’enroulement des nanoplaquettes. Les rayons résultants des nanohélices peuvent être ajustés en faisant varier linéairement les longueurs de chaîne organique associées, pour une population d'épaisseur donnée de nanoplaquettes. Malgré la contrainte de surface importante induite par les groupes thiolates, le paramètre de maille dans le plan des nanocristaux reste en moyenne égal à celui du zinc blende massif, comme le démontrent des expériences et des simulations par diffraction des rayons X à grand angle. L'orientation spécifique de ces objets anisotropes et déformés reflète un impact sur la forme et l'intensité de leurs pics correspondants en diffraction.Les moyens d'obtenir des nanoplaquettes de chalcogénure de cadmium présentant des propriétés chiroptiques en absorption sont abordés. La voie la plus prometteuse consiste à substituer les carboxylates achiraux en surface par des énantiomères chiraux de l'acide tartrique. Les valeurs de dissymétrie semblent augmenter avec le nombre de stéréocentres et présentent des signaux polarisés beaucoup plus forts avec les groupes fonctionnels de carboxylate qu'avec thiolate. Ces formes de courbe de type absorptif associées à la longueur d'onde de transition excitonique du cœur inorganique, résultent d'un effet d'hybridation entre leur niveau de trous et l'orbital moléculaire des ligands. D'autre part, les hélices de silice chirales décorées d'or, synthétisées à partir de l'auto-assemblage des molécules de tensioactif type gemini, sont également capables de démontrer le dichroïsme circulaire dans leur région de résonance plasmonique. Cela augmente avec la force du couplage plasmonique interparticulaire, en accord avec les simulations réalisées selon l'approximation des dipôles discrets. Une ouverture vers le tri des objets chiraux par optoacoustophorèse est documentée. Cette preuve de concept démontre de différentes vitesses de migration en moyenne dans le plan entre les énantiomères chiraux séparés, en fonction des conditions de travail acoustiques et optiques. L'effet de la forme et de la concentration des particules en solution montre qu'en cas d’empilement, la compressibilité d'un objet peut conduire à des comportements d'auto-organisation similaires à ceux des matières actives, des bactéries et des cellules
Belonging to II-VI semiconductors, cadmium chalcogenide nanoplatelets exhibit narrow optical features in the visible region. These particles can measure up to hundreds of nanometers in length and width, while presenting a few nanometers along their quantum confined thickness direction. During surface functionalization of ligands onto these ultrathin nanosheets, residually stressed bodies are created. This originates from the mismatch between the inorganic crystal lattice and layer of anchoring atoms, in addition to the steric repulsion brought by aliphatic chains. These three acting components are captured via a quantitative mechanical analysis to result in a model that allows for the prediction of curling in nanoplatelets. The resulting nanohelices radii are shown to be able to be tuned by linearly varying the associated organic chain lengths, for a given thickness population of nanoplatelets. Despite the important surface stress induced by thiolate headgroups, the average in-plane lattice parameter of these nanocrystals remains equal to that of zinc blende bulk as demonstrated experimentally and theoretically by wide-angle X-ray diffraction. Specific orientation of these anisotropic and distorted objects reflects an impact on the form and intensity of their corresponding scattered peaks.Ways to obtaining cadmium chalcogenide nanoplatelets that display chiroptical properties in absorption are addressed. The most promising route consists in substituting pristine surface achiral carboxylates by chiral enantiomers of tartaric acid. The dissymmetry values appear to increase with the number of stereocenters and show much stronger polarized signals with carboxylate than thiolate functional groups. These absorptive-like line shapes associated to the excitonic transition wavelength of the inorganic core, result from a hybridization effect between their hole level and the ligands’ molecular orbital. On the other hand, gold decorated chiral silica helices, synthesized from the benefit of the gemini surfactant molecules’ self-assembly, are also capable of exhibiting circular dichroism in their plasmon resonance region. This increases with the strength of the interparticle plasmonic coupling, in agreement with simulations performed under discrete dipole approximation. An opening towards sorting chiral objects via optoacoustophoresis is documented. This proof-of-concept demonstrates distinct average in-plane migration speeds between separate chiral enantiomers, as a function of the acoustics and optical working conditions. The effect of particles’ shape and concentration in solution show that upon jamming, an object’s compressibility can lead to self-organizing behaviors similarly to cases of active matters, bacteria and cells
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3

Liu, Juan. "Electrochemical Characterizations and Theoretical Simulations of Transport Behaviors at Nanoscale Geometries and Interfaces". Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/chemistry_diss/74.

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Since single nanopores were firstly proposed as a potential rapid and low-cost tool for DNA sequencing in 1990s (PNAS, 1996, 93, 13770), extensive studies on both biological and synthetic nanopores and nanochannels have been reported. Nanochannel based stochastic sensing at single molecular level has been widely reported through the detection of transient ionic current changes induced by geometry blockage due to analytes translocation. Novel properties, including ion current rectification (ICR), memristive and memcapacitive behaviors were reported. These fundamental properties of nanochannels arise from the nanoscale dimensions and enables applications not only in single molecule sensing, but also in drug delivery, electrochemical energy conversion, concentration enrichment and separation, nanoprecipitation, nanoelectronics etc. Electrostatic interactions at nanometer-scale between the fixed surface charges and mobile charges in solution play major roles in those applications due to high surface to volume ratio. However, the knowledge of surface charge density (SCD) at nanometer scale is inaccessible within nanoconfinement and often extrapolated from bulk planar values. The determination of SCD at nanometer scale is urgently needed for the interpretation of aforementioned phenomena. This dissertation mainly focuses on the determination of SCD confined at a nanoscale device with known geometry via combined electroanalytical measurements and theoretical simulation. The measured currents through charged nanodevices are different for potentials with the same amplitude but opposite polarities, which deviates away from linear Ohm's behavior, known as ICR. Through theoretical simulation of experiments by solving Poisson and Nernst-Planck equations, the SCD within nanoconfinement is directly quantified for the first time. An exponential gradient SCD is introduced on the interior surface of a conical nanopre based on the gradient distribution of applied electric field. The physical origin is proposed based on the facilitated deprotonation of surface functional groups by the applied electric field. The two parameters that describe the non-uniform SCD distribution: maximum SCD and distribution length are determined by fitting high- and low-conductivity current respectively. The model is validated and applied successfully for quantification and prediction of mass transport behavior in different electrolyte solutions. Furthermore, because the surface charge distribution, the transport behaviors are intrinsicaly heterogeneous at nanometer scale, the concept is extended to noninvasively determine the surface modification efficacy of individual nanopore devices. Preliminary results of single molecule sensing based on streptavidin-iminobiotin are included. The pH dependent binding affinity of streptavidin-iminobiotin binding is confirmed by different current change signals ("steps" and "spikes") observed at different pHs. Qualitative concentration and potential dependence have been established. The chemically modified nanopores are demonstrated to be reusable through regenerating binding surface.
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Borg, Marine. "Etude de l'adhérence peinture sur des nouvelles matières plastiques. Mécanismes et caractérisation". Electronic Thesis or Diss., Pau, 2024. http://www.theses.fr/2024PAUU3076.

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Les matériaux à base de copolymères de polypropylène (PP) sont largement utilisés par l'industrie automobile grâce à leurs nombreux avantages : allègement de la masse du véhicule, réduction de sa consommation et de la pollution induite, propriétés mécaniques et thermiques adaptées (résistance à la déformation et à la chaleur), réduction des coûts de production. La plupart des éléments intérieurs sont concernés mais aussi quelques pièces extérieures, tels que les boucliers ou les pare-chocs. Dans le cadre de nos travaux, nous nous sommes intéressés plus particulièrement aux boucliers, qui sont généralement peints pour des raisons esthétiques. Cela n'est pas sans poser quelques difficultés compte tenu de la faible tension de surface naturelle de ces matériaux qui peut engendrer des difficultés de tenue de la peinture sur ce type de surface. Plusieurs développements et améliorations sur le procédé de mise en peinture de ces matériaux ont eu lieu depuis le début de leur utilisation.(1) De nombreux travaux de recherche ont été menés sur les phénomènes d'adhésion sur des surfaces à faible énergie de surface. Il a ainsi été mis en évidence l'importance de préparer les surfaces avant leur mise en peinture afin d'augmenter leur énergie de surface. Les divers travaux se focalisent sur les différents paramètres de traitement, comme le flammage, en vue d'optimiser l'énergie de surface et de manière induite la tenue de la peinture. La composition chimique des matériaux à base de polypropylène (PP) est également un sujet traité par différents travaux, car selon les additifs et charges dans les formulations, l'adhésion de surface peut varier. Ce projet de thèse s'est focalisé sur la problématique de l'adhésion des peintures sur des matières plastiques commerciales. L'objectif principal est de mieux comprendre les mécanismes physico-chimiques d'adhésion entre les peintures et les pièces plastiques à base de polypropylène. Nous proposons une caractérisation complète, à différentes échelles, d'une série d'échantillons modèles visant à une meilleure compréhension des mécanismes d'adhésion de la peinture sur les plastiques. Des techniques de caractérisations de surface, comme l'XPS, le MEB, l'AFM ou des mesures d'angle de contact ont été utilisées pour comprendre les mécanismes se produisant à l'interface. Les traitements par flammage et par UV-ozone ont été choisis pour activer les surfaces. Deux axes de recherches ont été menés. D'une part, nous avons étudié l'influence de la quantité de talc, charge contenue dans les formulations commerciales, sur les propriétés d'adhésion. D'autre part, nous avons étudié l'impact des traitements de surface. D'après nos résultats, la quantité de charge minérale dans les mélanges de PP n'impacte pas la tenue de la peinture malgré leur influence sur le degré de cristallisation pouvant affecter la structure de la surface. Un traitement de surface modifiant les propriétés physiques de la surface, comme le flammage, reste indispensable pour assurer une bonne tenue de la peinture sur le support plastique et nous montrons dans nos travaux les modifications engendrées par ce traitement aboutissant à une meilleure tenue de la peinture.(1) En Europe, la Renault 5 fut la première voiture dotée d'un parechoc plastique. Vers 1985, on voit apparaitre des boucliers peints de la même couleur que la carrosserie
Materials based on polypropylene (PP) copolymers are widely used in automotive industry, thanks to their many advantages: lower vehicle weight, reduced fuel emission and pollution, good mechanical and thermal properties (resistance to deformation and heat), lower production costs. This applies to most interior components, but also a number of external parts like bumpers and shields. In our work, we were particularly interested in shields which are generally painted for aesthetic reasons. This raises several issues given the low natural surface tension of these materials, leading to a weak adhesion of paints on this type of surface. There have been a number of developments and improvements in the painting process for these materials since the beginning of their use. Many research projects have been carried out regarding adhesion phenomena on surfaces with low surfaces energy. They have highlighted the importance of preparing surfaces before they are painted in order to increase their surface energy. Various studies focus on the different treatment parameters, such as flaming, with a view to optimizing the surface energy and, consequently, the durability of the paint. The chemical composition of polypropylene (PP)-based materials is also a subject treated by various studies, because surface adhesion can vary depending on the additives and fillers in the formulations. This project aims at investigating the issues related to paint adhesion to commercial plastics. The main objective is to better understand the physico-chemical mechanisms of adhesion between paint and polypropylene-based plastic parts. We are proposing a complete characterization, at different scales, of a series of model samples aimed at a better understanding of the adhesion mechanisms of paint on plastics. Surface characterization techniques such as XPS, MEB, AFM and contact angle measurements were used to understand the interface mechanisms. Flame and UV-ozone treatments were chosen to activate the surfaces. Two lines of research were carried out. Firstly, we studied the influence of the quantity of talc, a filler contained in commercial formulations, on adhesion properties. Secondly, we studied the impact of surface treatments. According to our results, the quantity of mineral filler in PP blends has no impact on paint adhesion, despite their influence on the degree of crystallization, which can affect the surface structure. A surface treatment that modified the physical properties of the surface, such as flaming, is still essential to ensure that the paint holds well on the plastic substrate, in our work we show the modifications generated by this treatment, leading to better paint adhesion.(1) In Europe, the Renault 5 was the first car to be equipped with a plastic bumper. Around 1985, bumpers were painted the same color as the bodywork
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5

Jaabar, Ilhem Lilia. "Surface characterizations to investigate osteoarticular mesenchymal tissues : new insights to monitor the extracellular matrix remodeling at the supramolecular level". Electronic Thesis or Diss., Sorbonne université, 2022. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2022SORUS145.pdf.

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Un tissu conjonctif est un ensemble coopératif de cellules différenciées enchevêtrées dans une matrice extracellulaire (ECM). Cette dernière, particulièrement abondante, se compose principalement de protéines, telles que les collagènes, et d'un gel visqueux constitué d'eau et de protéoglycanes chargés négativement. Tous les tissus conjonctifs subissent un renouvellement constant de leur ECM, préservant ainsi l'intégrité et les propriétés des tissus. Des perturbations dans le remodelage de l'ECM, en termes de composition ou de structure supramoléculaire, peuvent avoir un impact significatif sur l'intégrité du tissu et sur ses propriétés biomécaniques, entraînant ainsi des dysfonctionnements et le développement de pathologies. Cependant, le remodelage de l’ECM est souvent étudié par des techniques biochimiques standards qui ne permettent pas de fournir des informations à l’échelle supramoléculaire. Sonder l’organisation de l’ECM à cette échelle peut contribuer significativement à la compréhension de la nature des processus biologiques et physicochimiques impliqués dans le remodelage pathologique de l’ECM. Dans cette objectif, nous avons développé une approche méthodologie originale permettant la caractérisation de tissus biologiques par des techniques de caractérisation de surface telle que l’AFM et l’XPS. Dans une première étude, l'AFM a été utilisé pour étudier l'effet de la procédure de réticulation UV/riboflavine sur la structure et les propriétés mécaniques de capsules d'épaule malades, qui sont principalement constituées de fibrilles de collagène de type I. Les résultats montrent que la procédure de réticulation a modifié les propriétés biomécaniques des capsules malades, en augmentant la rigidité des tissus sans modification de la structure et de la viabilité cellulaire.Dans une deuxième étude, nous avons étudier le remodelage de l’ECM du cartilage articulaire humain au cours de l’arthrose. Pour ce faire, nous avons caractérisé la composition, la structure et les propriétés mécaniques à différents degrés de sévérité d’arthrose par XPS et AFM. Les résultats ont permis de mettre en évidence deux phases : (1) une tentative de réparation, et (2) une dégradation irréversible du cartilage. Par ailleurs, des modifications structurales similaires à celles observées dans le cartilage arthrosique ont été observé sur des échantillons non arthrosiques traités enzymatiquement. Nos travaux ont donc permis de souligner le rôle central de l'équilibre homéostatique sur la progression de l’arthrose. Dans une troisième, un éventail de techniques de caractérisation moléculaire, biochimique et physicochimique a été utilisé pour déterminer la dynamique de minéralisation et les modifications de l’ECM au cours de la différenciation hypertrophique des chondrocytes. Cette étude a permis de montrer que la différenciation hypertrophique des chondrocytes préhypertrophiques induit un remodelage de l’ECM qui précède la minéralisation. Les analyses chimiques ont, par ailleurs, révélé que les minéraux nouvellement formés sont de l'hydroxyapatite faiblement cristallisée. La cartographie chimique révèle également la présence de débris cellulaires riches en phosphore. Ces derniers semblent être générés par l'apoptose croissante des chondrocytes
A connective tissue is a cooperative set of differentiated cells entangled in an extracellular matrix (ECM). The latter, which is particularly abundant, is composed mainly of proteins, such as collagens, and a viscous gel made up of water and negatively charged polysaccharides: proteoglycans. All connective tissues undergo a constant renewal of their ECM, thus preserving the integrity and properties of the tissue. Disturbances in ECM remodeling, in terms of composition or supramolecular structure, can have a significant impact on tissue integrity and biomechanical properties, leading to dysfunction and the development of pathologies. However, ECM remodeling is often studied by standard biochemical techniques that do not provide information at the supramolecular scale. Probing the organization of the ECM at this scale can contribute significantly to the understanding of the nature of the biological and physicochemical processes involved in pathological ECM remodeling. To this end, we have developed an original methodological approach allowing the characterization of biological tissues by surface characterization techniques such as AFM and XPS.In a first study, AFM was used to study the effect of the UV/riboflavin cross-linking procedure on the structure and mechanical properties of diseased shoulder capsules, which are mainly composed of type I collagen fibrils. The results show that the cross-linking procedure modified the biomechanical properties of the diseased capsules, increasing tissue stiffness without altering the structure and cell viability.In a second study, we investigated the remodeling of human articular cartilage ECM during OA. To do so, we characterized the composition, structure and mechanical properties at different degrees of OA severity by XPS and AFM. The results revealed 2 phases: (1) a repair attempt, and (2) an irreversible degradation of the cartilage. Moreover, structural modifications similar to those observed in osteoarthritic cartilage were observed on non-osteoarthritic samples treated with enzymes. Our work has thus highlighted the central role of homeostatic balance in the progression of OA.In a third study, a range of molecular, biochemical and physicochemical characterization techniques were used to determine the mineralization dynamics and ECM modifications during hypertrophic differentiation of chondrocytes. This study showed that hypertrophic differentiation of prehypertrophic chondrocytes induces ECM remodeling that precedes mineralization. Chemical analyses further revealed that the newly formed minerals are weakly crystallized hydroxyapatite. Chemical mapping also reveals the presence of phosphorus-rich cellular debris. The latter seem to be generated by the increasing apoptosis of chondrocytes
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6

Kutluer, Kutlu. "Electrical, Optical, And Noise Characterizations Of Mwir Type-ii Inas/gasb Superlattice Single Pixel Detectors". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614737/index.pdf.

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Detection of mid-wavelength infrared radiation is crucial for many industrial, military and biomedical applications. Photon detectors in the market can operate at only low temperature which increases weight, power consumption and total cost. Type-II InAs/GaSb superlattice infrared detectors are expected to have a major role in the infrared detector market with providing high quality detection characteristics at higher temperatures. Therefore, in the past decade, there has been an increasing interest in infrared detectors based on type-II InAs/GaSb superlattice technology due to their long range adjustable bandgap, low tunneling current and Auger recombination rates which bring potential of high temperature operation. Characterization of this photodiodes requires detailed investigations on different aspects. This study focuses on various optical and electrical characterization techniques for single pixel infrared detectors: responsivity characterization using FTIR and blackbody source, dark I-V and R-V characterizations, response time measurement. Characterizations of detector noise with respect to frequency and bias voltage are studied in detail. These characterization techniques are carried out in order to observe the effects of design with three different &ldquo
standard&rdquo
and a new &ldquo
N&rdquo
structure designs and also to understand the effects of surface passivation with atomic layer deposited Al2O3 layer and ordinary PECVD deposited Si3N4 and SiO2 layers. When standard photodiodes are compared, we observed that the one with the thickest active absorber region has the highest response and dark current density values. &ldquo
N&rdquo
structure design photodiode has very low dark current density while its optical performance is not as high as the standard designs. Si3N4 passivation degrades both optical and electrical performances. SiO2 and Al2O3 passivation layers improve optical and electrical characteristics of photodiodes. Theoretical and experimental dark current noise values of SiO2 passivated sample in agreement up to 0.18V reverse bias while those values of unpassivated and Si3N4 passivated samples agree only at zero bias. Temperature dependent R-V characteristics of photodiodes are analyzed and the surface limited activation energy is calculated in order to investigate the additional noise. At the end, surface recombination noise is proposed to cover the deficit on the noise calculation.
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7

Peyroux, Jérémy. "Développement de films extrudés à propriétés spécifiques grâce aux technologies de traitement de surfaces : fluoration, plasma et combinaisons". Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22547.

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En raison de leurs nombreux avantages, les matériaux polymères sont aujourd'hui reconnus comme des éléments essentiels de notre quotidien. Ils composent une quantité importante d'objets de la vie courante dans lesquels ils ont souvent substitué les substances naturelles initialement utilisées. Néanmoins, pour une utilisation dans le domaine de l’emballage, ces matériaux présentent des contraintes non négligeables qui nécessitent une recherche permanente. L’amélioration et l’optimisation des propriétés d’imprimabilité, barrières aux gaz et de machinabilité représentent un enjeu crucial pour répondre aux nouvelles réglementations, législations mais aussi phénomènes sociétaux et exigences industrielles. La solution d'étude retenue ici est de traiter la surface de matériaux commerciaux. Les différents traitements plasma, relativement bien maitrisés sur ce type de matériaux, ont été combinés avec des procédés de fluoration, plus originaux. La fluoration directe est ainsi apparue comme une solution privilégiée du fait de son efficacité avérée sur ce type de matériaux. La maitrise des différents paramètres intrinsèques à chaque procédé a permis d’identifier l’unicité de chaque traitement et combinaison afin d’ajuster, non seulement la morphologie, mais surtout la composition de surface des films traités en fonction des propriétés ciblées. Des caractérisations spectroscopiques ont tout d’abord été mises en place pour identifier les mécanismes associés à chacun de ses traitements seuls ou combinés. La morphologie des surfaces a également été caractérisée par des techniques classiques de microscopie. Enfin, l’étude des propriétés résultantes et leur stabilité dans le temps ont permis de mettre en évidence l’intérêt de ces procédés pour améliorer les propriétés actuelles des films d’emballages et leur stabilité ; notamment leur imprimabilité, et leur comportement barrière aux gaz
Currently, polymeric materials are currently well-recognized as essential elements of our daily life due to the advantages that they exhibit, in which they can replace the originally natural products. However, the use of these materials for packaging applications has still significant drawbacks. The interest of research on polymeric materials is potentially required in order to provide a good compromise of properties such as printability, gas barrier and machinability. Aims are to follow the new regulations, laws, but also societal phenomena and industrial phenomena.In this study, surface treatments were directly applied on material polymers dedicated to packaging applications. Plasma treatments, relatively well mastered, were combined with original fluorination processes. In comparison, direct fluorination was effectively used to increase polymer properties. Each treatment and their combination were carried out with various intrinsic parameters under control to adjust both surface morphology and surface composition of treated polymers according to targeted film properties.Spectroscopic characterizations were first monitored to identify the mechanisms associated with each treatment (alone or in combination). Surface morphology was also observed on standard microscopic techniques. The resulting properties and their long-termed stability were carried. These studies highlight the effectiveness of those treatments to improve the current properties of packaging films and stability: including printability, and barrier properties
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8

Gakis, Giorgos. "Modélisation multi-échelles et analyse expérimentale de l'ALD d'alumine : interactions entre dynamique du procédé, chimie de surface et phénomènes interfaciaux". Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0097.

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Le rétrécissement continu des dispositifs microélectroniques exige la production des couches nanométriques uniformes et conformes, avec une pureté chimique et des interfaces abruptes. Le dépôt de couche atomique (ALD) est un procédé favorable à la production de tels films. Tirant ses avantages de la nature auto-limitante des réactions, ALD peut permettre un contrôle de l’épaisseur à la monocouche, produisant des films de haute pureté. Bien que l'ALD présente de nombreux avantages, des inconvénients se rencontrent lors du dépôt de films de quelques nanomètres. En particulier, la croissance initiale en îlots et la formation d'une couche interfaciale sont deux de ses limitations principales, en particulier dans le cas du dépôt d’oxyde métallique sur Si. De plus, le dépôt sur des grandes surfaces n'est pas toujours uniforme et dépend du réacteur et des conditions du procédé. Ces inconvénients doivent être supprimés afin de déposer des films d'oxydes sur Si, essentiels pour la production de transistors à effet de champ du futur. Dans cette thèse, l'ALD de Al2O3 de TMA et H2O sur Si est étudiée de manière approfondie, afin de remédier aux inconvénients ci-dessus. L'étude consiste en une approche multi-échelles numérique et expérimentale combinée. Quatre modèles numériques différents ont été développés pour traiter différentes échelles d'espace. Un ensemble de techniques de caractérisation a été utilisé, notamment l'ellipsométrie, XRR, TEM, STEM, EDX, XPS et SIMS. Dans ce cadre, les phénomènes détaillés sont illuminés, ce qui permet de comprendre le processus et l'origine des inconvénients de l'ALD. La compétition entre la désorption et les réactions de surface, s'est avérée être le facteur limitant pour le dépôt à basse température, jusqu'à 200°C. La concentration des sites réactifs en surface limite le dépôt à des températures supérieures à 300°C. Bien que l’ALD soit conçu comme un processus dépendant uniquement de la chimie de surface, l’analyse des phénomènes de transport à l’intérieur du réacteur a montré que la conception du réacteur et du processus peut affecter la distribution des réactifs et la température à l’intérieur du réacteur ALD. L'approche multi-échelles et le couplage entre les différents modèles numériques ont révélé que l'interaction entre les mécanismes de surface et les phénomènes de transport avait un effet sur l'uniformité du dépôt. En utilisant cette approche numérique, il est possible de dériver des conditions optimales garantissant une uniformité du film. Au cours des premières étapes, le dépôt du film est inhibée, ce qui a conduit à un régime de croissance en îlots. L'analyse intégrée a montré que 25 cycles d'ALD sont nécessaires pour déposer un film continu de Al2O3. Au cours de ce régime, l'oxydation interfaciale a conduit à la formation d'une couche d'oxyde interfacial d'environ 2 nm, composée de SiOx, AlOx et SixOyAl, qui altère les propriétés et donc les applications potentielles de la structure déposée. Un prétraitement in situ au plasma N2-NH3 du substrat de Si a été introduit, conduisant à la formation d'une couche de SixNyH sur la surface du substrat. Le prétraitement a augmenté la réactivité de surface, et la période d’inhibition était limitée. Une croissance linéaire est obtenue après 5 cycles. En outre, l'oxydation interfaciale du Si a été réduite, car la couche SixNyH s'est avérée servir de barrière efficace pour la diffusion de l' O et l'oxydation du Si. Le travail présenté dans cette thèse montre la nécessité de telles approches intégrées pour analyser les phénomènes impliqués dans l'ALD. Telles études permettent une compréhension approfondie des mécanismes, afin de proposer des solutions pour lutter contre les inconvénients apparus lors des premières étapes de dépôt. Cela pourrait permettre a l’ ALD de produire des couches minces nanométriques uniformes et conformes de grande pureté avec des interfaces abruptes, capables de répondre aux exigences de l’industrie électronique
The constant shrinking of microelectronic devices requires the production of conformal and uniform nanometric thin films, with a high chemical purity and abrupt interfaces. In this context, Atomic Layer Deposition (ALD) has emerged as a favorable process to produce such films. Drawing its advantages from the self-limiting nature of the surface reactions involved, ALD can yield thickness control down to the monolayer, producing conformal films of high purity. Although ALD has many advantages, drawbacks arise when depositing films of some nanometers. In particular, the initial island growth and the formation of an interfacial oxide layer are two of its main limitations, especially for the case of metal oxide ALD on Si. Moreover, the deposition on large area wafers is not always uniform, and depends on the reactor and process design. These drawbacks need to be suppressed in order to establish ALD as the adequate process for the deposition of high-k gate oxides on Si, essential for the production of field effect transistors of the future. In this thesis, the ALD of Al2O3 from TMA and H2O on Si is thoroughly investigated, in order to tackle the above drawbacks. The investigation consists of a combined multiscale computational and experimental approach. Four different numerical models were developed dealing with different space scales. A complete set of characterization techniques was used, including ellipsometry, XRR, TEM, STEM, EDX, XPS and SIMS. Using this framework, the detailed phenomena involved are illuminated, thus allowing to better understand the process and identify the factors responsible for the drawbacks of ALD. The competition between surface mechanisms, namely desorption and surface reactions, was found to be the limiting factor for deposition at low temperatures, up to 200oC. The concentration of surface reactive sites was found to limit the deposition at higher temperatures up to 300oC. Although ALD is conceived as a process depending only on surface chemistry, the analysis of the transport phenomena inside the ALD chamber showed that the reactor and process design can affect the reactant and temperature distribution inside the ALD reactor. The multiscale approach and the coupling among the different computational models revealed that the interplay between surface mechanisms and transport phenomena affects the film uniformity. Using this computational approach, it was possible to derive optimal process conditions that ensure maximum film uniformity. During the first deposition steps, the film deposition was found to be inhibited, leading to an island growth regime. The integrated analysis showed that 25 cycles are needed in order to deposit a continuous Al2O3 film. During this regime, interfacial oxidation of the Si substrate led to the formation of a ~2 nm interfacial oxide layer, consisting of SiOx, AlOx, and Al-silicates, which degrades the properties and thus the potential applications of the deposited structure. An in situ N2-NH3 plasma pretreatment of the HF-cleaned Si substrate was introduced, leading to a formation of a SixNyH layer on the substrate surface. The pretreatment was found to enhance the surface reactivity, as the inhibition period was restricted and linear ALD growth was obtained even after 5 cycles. Furthermore, interfacial Si oxidation was reduced, as the SixNyH layer was found to serve as an effective barrier for O diffusion and Si oxidation. The work presented in this thesis demonstrates the necessity of such integrated approaches to analyze the detailed phenomena involved in ALD. Such studies help in the thorough understanding of the ALD mechanisms, and consequently in elaborating solutions which restrict the drawbacks arising during the initial deposition steps. This could pave the way for the ALD process to industrially produce uniform and conformal nanometric thin films of high purity and abrupt interfaces, able to answer to the demands of the future electronic industry
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9

Gür, Fatih Nadi. "Plasmonic waveguides self-assembled on DNA origami templates: from synthesis to near-field characterizations". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-235762.

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Manipulating light by controlling surface plasmons on metals is being discussed as a means for bridging the size gap between micrometer-sized photonic circuits and nanometer-sized integrated electronics. Plasmonic waveguides based on metal nanoparticles are of particular interest for circumventing the diffraction limit, thereby enabling high-speed communication over short-range distances in miniaturized micro-components. However, scalable, inexpensive fine-tuning of particle assemblies remains a challenge and near-field probing is required to reveal plasmonic interactions. In this thesis, self-assembled waveguides should be produced on DNA scaffolds. DNA origami is an extremely versatile and robust self-assembly method which allows scalable production of nanostructures with a fine control of assemblies at the nanoscale. To form the plasmonic waveguides, six-helix bundle DNA origami nanotubes are used as templates for attachment of highly monodisperse and monocrystalline gold nanoparticles with an inter-particle distance of 1-2 nm. In the first part of this thesis, the effects of parameters which are involved in assembly reactions are systematically investigated. The assembly yield and binding occupancy of the gold nanoparticles are determined by an automated, high-throughput image analysis of electron micrographs of the formed complexes. As a result, unprecedented binding site occupancy and assembly yield are achieved with the optimized synthesis protocol. In addition, waveguides with different sizes of gold nanoparticles and different inter-particle distances, quantum dots attachments to the waveguides and multimerization of the waveguides are successfully realized. In the second part of this thesis, direct observation of energy transport through a self-assembled waveguide towards a fluorescent nanodiamond is demonstrated. High-resolution, near-field mapping of the waveguides are studied by electron energy loss spectroscopy and cathodoluminescence imaging spectroscopy. The experimental and simulation results reveal that energy propagation through the waveguides is enabled by coupled surface plasmon modes. These surface plasmon modes are probed at high spatial and spectral resolutions. The scalable self-assembly approach presented here will enable the construction of complex, sub diffraction plasmonic devices for applications in high-speed optical data transmission, quantum information technology, and sensing
Die Manipulation des Lichts durch die Kontrolle von Oberflächenplasmonen auf metallischen Oberflächen und Nanopartikeln gilt als vielversprechende Methode zur Überbrückung der Größen-Lücke zwischen Mikrometer-großen photonischen und nanometer-großen elektronischen Schaltkreisen. Plasmonische Wellenleiter basierend auf metallischen Nanopartikeln sind vom besonderen Interesse, da sie die Umgehung des Beugungslimits und somit eine Hochgeschwindigkeitskommunikation über kurze Distanzen in immer kleiner werdenden Schaltkreisen ermöglichen könnten. Allerdings ist die skalierbare und kostengünstige Anordnung von Partikeln eine große Herausforderung und es werden Nahfelduntersuchungen benötigt um plasmonische Interaktionen detektieren zu können. Das Ziel dieser Arbeit ist die Selbstassemblierung von multi-partikel Wellenleitern auf DNA Gerüsten. Die Verwendung von DNA-Origami bietet eine äußerst vielseitige Plattform zur skalierbaren Herstellung von Nanostrukturen mittels Selbstassemblierung und ermöglicht eine präzise Kontrolle der Anordnungen im Nanobereich. Für den Aufbau der plasmonischen Wellenleiter werden DNA-Origami Nanoröhren, bestehend aus sechs Helices als Templat für die Anbindung von monodispersen und monokristallinen Goldnanopartikeln mit einem interpartikulären Abstand von 1-2 nm verwendet. Im ersten Abschnitt dieser Arbeit werden die beeinflussenden Faktoren dieser Assemblierungsreaktion systematisch untersucht. Die Ausbeute der assemblierten Strukturen und die Besetzung der Bindungsstellen werden durch eine automatisierte und effiziente Bildanalyse von Elektronenmikroskopieaufnahmen ausgewertet. Durch die Entwicklung eines optimierten Syntheseprotokolls werden bisher unerreichte Assemblierungsausbeuten ermöglicht. Zusätzlich erfolgen die experimentelle Realisierung von Strukturen mit verschieden großen Goldnanopartikeln und unterschiedlichen interpartikulären Abständen, sowie die Anbindung von Quantenpunkten an die Wellenleiter und eine Verknüpfung der assemblierten Strukturen. Der zweite Abschnitt dieser Dissertation befasst sich mit der Untersuchung des Energietransports in selbstassemblierten Wellenleitern über einen fluoreszierenden Nanodiamanten. Dazu erfolgen hochaufgelöste Nahfeldmessungen der Wellenleiter mittels Elektronenenergieverlustspektroskopie und Kathodolumineszenz-mikroskopie. Die experimentellen Ergebnisse und zusätzlich durchgeführte Simulationen bestätigen eine durch gekoppelte Oberflächenplasmonenmoden induzierte Weitergabe der Energie innerhalb des Wellenleiters. Diese Oberflächenplasmonenmoden werden bei hoher räumlicher und spektraler Auflösung untersucht. Das hier umgesetzte Konzept der Selbstassemblierung wird den Aufbau komplexer plasmonischer Geräte für Anwendungen im Bereich der optischen Hochgeschwindigkeitsdatenübertragung, der Quanteninformations-technolgie und der Sensorik ermöglichen
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Andrews, Marilyn Mockus 1958. "Characterization of the surface acidity of passivated iron particles by flow microcalorimetry". Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276614.

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The characteristics of passivated iron particles have been examined with flow microcalorimetry to determine the acidic nature of the surface sites. The molar heat of adsorption of pyridine from hexane was measured with a FMC and a differential refractive index detector, at 23 and 40°C. The adsorption data were found to obey the assumptions of the Freundlich isotherm. The adsorption densities at different temperatures were used to calculate the isosteric heat of adsorption. The molar heat of adsorption of triethylamine from hexane was also measured and combined with the data for pyridine in order to calculate the Drago constants for the iron particles. A static adsorption method was used for the adsorption of pyridine from hexane onto the iron particles, for comparison with the dynamic method. The heat of wetting for the iron particles, with hexane, has also been measured. The iron particles were examined with X-ray diffraction. Mossbauer spectroscopy, XPS, SEM, TEM, and electrophoresis to characterize the surface layer. These techniques have revealed that the iron particles are coated with ferric oxide and this surface is amphoteric in aqueous solutions.
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Libros sobre el tema "Surface characterizations"

1

Sadiq, Shah, NACE Task Group T-3A-16 y NACE Task Group T-3L-17, eds. Surface and interface characterizations in corrosion. Houston, Tex: NACE International, 1994.

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Jones, D. W. Summary of biological, chemical and morphological characterizations of 33 surface-mine lakes in Illinois and Missouri. S.l: s.n, 1985.

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1931-, Brune Dag, ed. Surface characterization: A user's sourcebook. [Oslo]: Scandinavian Science Publisher, 1997.

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Pike, Richard J. Quantitative characterization of micro-topography: A bibliography of industrial surface metrology. Menlo Park, CA: U.S. Dept. of the Interior, U.S. Geological Survey, 1998.

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A, Favre Eduardo y Fuentes Néstor O, eds. Functional properties of bio-inspired surfaces: Characterization and technological applications. Hackensack, NJ: World Scientific, 2009.

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Laboratory, Oak Ridge National, ed. Surface Modification and Characterization Collaborative Research Center at Oak Ridge National Laboratory. Oak Ridge, Tenn: Oak Ridge National Laboratory, 1986.

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1936-, Unger Klaus Konradin y International Union of Pure and Applied Chemistry., eds. Characterization of porous solids. Amsterdam: Elsevier, 1988.

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Miyoshi, Kazuhisa. Surface characterization techniques: An overview. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.

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United States. National Aeronautics and Space Administration., ed. Surface characterization and contamination analysis. Huntsville, Ala: In-line Process Control Laboratory, Center for Automation & Robotics, University of Alabama in Huntsville, 1994.

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Luigia, Sabbatini y Zambonin Pier Giorgio, eds. Surface characterization of advanced polymers. Weinheim [Germany]: VCH, 1993.

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Capítulos de libros sobre el tema "Surface characterizations"

1

Zhou, Meng. "Characterizations of Surface Ligands and Stabilizers on Metallic Nanoparticles". En ACS Symposium Series, 103–33. Washington, DC: American Chemical Society, 2019. http://dx.doi.org/10.1021/bk-2019-1317.ch006.

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Vargha-Butler, E. I., D. R. Absolom, A. Wilhelm Neumann y H. A. Hamza Emr Canmet. "Characterizations of Coal by Contact-Angle and Surface-Tension Measurements". En Interfacial Phenomena in Coal Technology, 33–84. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9780367813185-3.

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Ramezanzade, Vahid, Fariba Mehvari, Mohammad Dinari y Shahid ul Islam. "Advances in Synthetic Methods, Surface Chemistry, and Characterizations of Fullerenes". En Green Carbon Materials for Environmental Analysis: Emerging Research and Future Opportunities, 41–74. Washington, DC: American Chemical Society, 2023. http://dx.doi.org/10.1021/bk-2023-1441.ch003.

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Le Magueresse, Romain, Frédéric Giraud, Fabrice Casset, Anis Kaci, Brigitte Desloges y Mikael Colin. "Preliminary Design of a Flexible Haptic Surface". En Haptics: Science, Technology, Applications, 207–15. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06249-0_24.

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AbstractThis paper presents the preliminary development of a flexible haptic surface in order to produce texture rendering on a large conformable area. For this purpose, Haptic Pixels vibrating at ultrasonic frequencies are actuated by piezoelectric elements and implanted on a flexible matrix. The design leads to square glass plates of 10 $$\times $$ × 10 mm$$^2$$ 2 with a thickness of 500 $$\upmu $$ μ m, actuated by PZT ceramics with a thickness of 200 $$\upmu $$ μ m and a radius of 2.5 mm bonded on a 100 $$\upmu $$ μ m thick PEEK film. Electromechanical characterizations validate the design. The PEEK film between two pixels is exploited to separate them, to obtain the flexibility of the surface and to create an area of friction reduction with a stationary wave. Haptic evaluations are carried out to confirm the performances of the approach on a Haptic Pixel.
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Lang, S. B., G. A. Stanciu y S. G. Stanciu. "Chapter 4. Non-linear Characterizations of Surface Charge and Interfacial Morphology". En Nanoscience & Nanotechnology Series, 45–62. Cambridge: Royal Society of Chemistry, 2011. http://dx.doi.org/10.1039/9781849733366-00045.

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Charitidis, C. A., D. A. Dragatogiannis, E. P. Koumoulos y D. Perivoliotis. "Mechanical, Tribological Properties, and Surface Characteristics of Nanotextured Surfaces". En Nanomaterial Characterization, 179–208. Hoboken, NJ, USA: John Wiley & Sons, Inc, 2016. http://dx.doi.org/10.1002/9781118753460.ch9.

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Huanga, Xiaohu, Jaime Jia Min Pang y Yee Ng. "Effect of Plasma Electrolytic Oxidation on the Fatigue Strength of Al Alloys: Mechanistic Understanding from Surface and Sub-Surface Characterizations". En Lecture Notes in Mechanical Engineering, 231–34. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8643-9_26.

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Kocak, Emine Dilara, Nigar Merdan, Ilker Mistik y Burcu Yılmaz Sahinbaskan. "Fiber Extraction from Okra Plant Agricultural Wastes, Their Characterizations and Surface Modifications by Environmental Methods". En Sustainable Innovations in Textile Fibres, 53–80. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8578-9_3.

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Tantra, R., K. N. Robinson y J. C. Jarman. "Surface Area". En Nanomaterial Characterization, 133–52. Hoboken, NJ, USA: John Wiley & Sons, Inc, 2016. http://dx.doi.org/10.1002/9781118753460.ch7.

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Belsey, N. A., A. G. Shard y C. Minelli. "Surface Chemistry". En Nanomaterial Characterization, 153–78. Hoboken, NJ, USA: John Wiley & Sons, Inc, 2016. http://dx.doi.org/10.1002/9781118753460.ch8.

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Actas de conferencias sobre el tema "Surface characterizations"

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Kwarteng, Felix A., Mohsen A. Hassan, Hidenori Ohashi y Ahmed S. G. Khalil. "Textile Wastewater Treatment Using Activated Graphene-Like Biochar Derived from Onion Peel Biomass". En 2024 8th International Conference on Materials Engineering and Nano Sciences & 2024 8th International Conference on Material Engineering and Manufacturing, 3–11. Switzerland: Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-lxmzt1.

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Allium cepa L., popularly known as onion, has many benefits aside from being used as a vegetable. This study explored onion peel biomass by converting it to biochar (BC) followed by activation with KOH under optimal temperature and mix ratio. Various characterizations such as Raman, SEM, XRD and BET were performed to examine the surface and morphological properties of the activated biochar. The developed BC was utilized to treat textile wastewater composing methyl orange (MO) dye. The KOH-activated onion peel biochar showed a surface area of 1725.6 m2/g, resulting in a maximum dye adsorption capacity of 454.54 mg/g. Raman spectroscopy further revealed the existence of graphene-like structures of the biochar. The adsorption kinetics show that BC follows the pseudo-second-order model with an R2 of 0.9988. The isotherm experiments also conformed to the Langmuir model with an R2 of 0.9958. The influence of pH was studied, and results showed higher removal efficiencies at a pH of 2. Finally, the regeneration and recyclability of the prepared adsorbent was run for three successive cycles, after which it maintained appreciable adsorption capacity and removal efficiencies. Overall, the BC derived from onion peel demonstrated that it could be a promising alternative and high-performance adsorbent for treating textile wastewater.
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Kim, Hyunjun, Randall S. Hay, Sean A. McDaniel, Gary Cook, Nicholas G. Usechak, Augustine M. Urbas, HeeDong Lee et al. "Optical characterizations on surface-polished polycrystalline YAG fibers". En SPIE Defense + Security, editado por Mark Dubinskii y Stephen G. Post. SPIE, 2017. http://dx.doi.org/10.1117/12.2262673.

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Bons, Jeffrey y Kenneth Christensen. "A Comparison of Real and Simulated Surface Roughness Characterizations". En 37th AIAA Fluid Dynamics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-3997.

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Wu, Zhouling, Pao-Kuang Kuo, Y. S. Lu y S. T. Gu. "Laser-induced surface thermal lensing for thin film characterizations". En Laser-Induced Damage in Optical Materials: 1995, editado por Harold E. Bennett, Arthur H. Guenther, Mark R. Kozlowski, Brian E. Newnam y M. J. Soileau. SPIE, 1996. http://dx.doi.org/10.1117/12.240357.

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Chaudron, S., V. Gernigon y A. Rissons. "Vertical-cavity surface-emitting laser characterizations for space applications". En SPIE OPTO, editado por Chun Lei y Kent D. Choquette. SPIE, 2015. http://dx.doi.org/10.1117/12.2079633.

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Hopkins, Matthew, Ashish Jindal, Ezra Bussmann, Taisuke Ohta, Morgann Berg, Cherrelle Thomas, David Scrymgeour, Paul Clem y Christopher Moore. "Employing Nanoscale Surface Characterizations in a Field Emission Model." En Proposed for presentation at the 47th IEEE International Conference on Plasma Sciences held December 6-10, 2020. US DOE, 2020. http://dx.doi.org/10.2172/1835000.

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Hopkins, Matthew M., Ashish K. Jindal, Ezra Bussmann, Taisuke Ohta, Morgann Berg, Cherrelle Thomas, David Scrymgeour, Paul G. Clem y Christopher H. Moore. "Employing Nanoscale Surface Characterizations in a Field Emission Model". En 2020 IEEE International Conference on Plasma Science (ICOPS). IEEE, 2020. http://dx.doi.org/10.1109/icops37625.2020.9717571.

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Hillmann, S., H. Heuer y N. Meyendorf. "High frequency eddy current device for near surface material characterizations". En SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, editado por Norbert G. Meyendorf, Kara J. Peters y Wolfgang Ecke. SPIE, 2009. http://dx.doi.org/10.1117/12.815455.

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Hasegawa, Kunio, Yinsheng Li, Valery Lacroix y Bohumir Strnadel. "Re-Characterization of Subsurface Flaw to Surface Flaw Based on Equivalent Fatigue Crack Growth Rate". En ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45946.

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A subsurface flaw located near a component surface is transformed to a surface flaw in accordance with a flaw-to-surface proximity rule. The re-characterization process from subsurface to surface flaw is adopted in all fitness-for-service (FFS) codes. However, the criteria of the re-characterizations are different among the FFS codes. In addition, the proximity factors in the rules are defined by constant values, irrespective of flaw aspect ratios. This paper describes the stress intensity factor interaction between the subsurface flaw and component free surface, and proposes a proximity factor from the point of view of fatigue crack growth rates.
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Chik, Zamri y Taohidul Islam. "Near surface soil characterizations through soil apparent resistivity: A case study". En 2013 IEEE 7th International Conference on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications (IDAACS). IEEE, 2013. http://dx.doi.org/10.1109/idaacs.2013.6662639.

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Informes sobre el tema "Surface characterizations"

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Sharpe, Lisa M. Analytical Characterization of Bistatic Scattering from Rough Surfaces: Dependence on Surface Correlation Function. Fort Belvoir, VA: Defense Technical Information Center, junio de 1992. http://dx.doi.org/10.21236/ada256525.

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Marín Boyero, Adrián y Miguel Angel Rodriguez Valverde. Shear adhesion of a sessile drop under a centrifugal field. Fundación Avanza, mayo de 2023. http://dx.doi.org/10.60096/fundacionavanza/1542022.

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White, Kenneth W., Albert S. Kobayashi, K. Ravi-Chandar y John C. Wolfe. Acquisition of Surface Characterization Equipment. Fort Belvoir, VA: Defense Technical Information Center, mayo de 2000. http://dx.doi.org/10.21236/ada378887.

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Author, Not Given. Biomass Surface Characterization Laboratory (Fact Sheet). Office of Scientific and Technical Information (OSTI), abril de 2012. http://dx.doi.org/10.2172/1051140.

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Leckie, J. O. Characterization of surface processes on mineral surfaces in aqueous solutions. Annual report for fiscal year 1993. Office of Scientific and Technical Information (OSTI), noviembre de 1993. http://dx.doi.org/10.2172/425289.

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McClure, Michael A., Yitzhak Spiegel, David M. Bird, R. Salomon y R. H. C. Curtis. Functional Analysis of Root-Knot Nematode Surface Coat Proteins to Develop Rational Targets for Plantibodies. United States Department of Agriculture, octubre de 2001. http://dx.doi.org/10.32747/2001.7575284.bard.

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The goal of this research was to provide a better understanding of the interface between root-knot nematodes, Meloidogyne spp., and their host in order to develop rational targets for plantibodies and other novel methods of nematode control directed against the nematode surface coat (SC). Specific objectives were: 1. To produce additional monoclonal SC antibodies for use in Objectives 2, 3, and 4 and as candidates for development of plantibodies. 2. To determine the production and distribution of SC proteins during the infection process. 3. To use biochemical and immunological methods to perturbate the root-knot nematode SC in order to identify SC components that will serve as targets for rationally designed plantibodies. 4. To develop SC-mutant nematodes as additional tools for defining the role of the SC during infection. The external cuticular layer of nematodes is the epicuticle. In many nematodes, it is covered by a fuzzy material termed "surface coat" (SC). Since the SC is the outermost layer, it may playa role in the interaction between the nematode and its surroundings during all life stages in soil and during pathogenesis. The SC is composed mainly of proteins, carbohydrates (which can be part of glycoproteins), and lipids. SC proteins and glycoproteins have been labeled and extracted from preparasitic second-stage juveniles and adult females of Meloidogyne and specific antibodies have been raised against surface antigens. Antibodies can be used to gain more information about surface function and to isolate genes encoding for surface antigens. Characterization of surface antigens and their roles in different life-stages may be an important step towards the development of alternative control. Nevertheless, the role of the plant- parasitic nematode's surface in plant-nematode interaction is still not understood. Carbohydrates or carbohydrate-recognition domains (CROs) on the nematode surface may interact with CROs or carbohydrate molecules, on root surfaces or exudates, or be active after the nematode has penetrated into the root. Surface antigens undoubtedly play an important role in interactions with microorganisms that adhere to the nematodes. Polyclonal (PC) and monoclonal (MC) antibodies raised against Meloidogyne javanica, M. incognita and other plant-parasitic nematodes, were used to characterize the surface coat and secreted-excreted products of M. javanica and M. incognita. Some of the MC and PC antibodies raised against M. incognita showed cross-reactivity with the surface coat of M. javanica. Further characterization, in planta, of the epitopes recognized by the antibodies, showed that they were present in the parasitic juvenile stages and that the surface coat is shed during root penetration by the nematode and its migration between root cells. At the molecular level, we have followed two lines of experimentation. The first has been to identify genes encoding surface coat (SC) molecules, and we have isolated and characterized a small family of mucin genes from M. incognita. Our second approach has been to study host genes that respond to the nematode, and in particular, to the SC. Our previous work has identified a large suite of genes expressed in Lycopersicon esculentum giant cells, including the partial cDNA clone DB#131, which encodes a serine/threonine protein kinase. Isolation and predicted translation of the mature cDNA revealed a frame shift mutation in the translated region of nematode sensitive plants. By using primers homologous to conserved region of DB#131 we have identified the orthologues from three (nematode-resistant) Lycopersicon peruvianum strains and found that these plants lacked the mutation.
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Hercules, D. Characterization of oxidized coal surfaces. Office of Scientific and Technical Information (OSTI), septiembre de 1989. http://dx.doi.org/10.2172/5514091.

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Gaines, D. P., D. W. Sweeney, K. W. DeLong, S. P. Vernon, S. L. Baker, D. A. Tichenor y R. Kestner. Surface characterization of optics for EUV lithography. Office of Scientific and Technical Information (OSTI), mayo de 1996. http://dx.doi.org/10.2172/378184.

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Koberstein, Jeffrey T. Characterization of Polymeric Surfaces and Interfaces. Fort Belvoir, VA: Defense Technical Information Center, marzo de 1989. http://dx.doi.org/10.21236/ada210227.

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Koberstein, Jeffrey T. Characterization of Polymeric Surfaces and Interfaces. Fort Belvoir, VA: Defense Technical Information Center, octubre de 1986. http://dx.doi.org/10.21236/ada175602.

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