Bibliographies thématiques / Energy X-ray Dispersive Spectroscopy (EDX)

Littérature scientifique sur le sujet « Energy X-ray Dispersive Spectroscopy (EDX) »

Auteur : Grafiati

Publié le 11 mars 2023

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Articles de revues sur le sujet "Energy X-ray Dispersive Spectroscopy (EDX)"

Cvetkovic, Vesna, Luka Bjelica, Natasa Vukicevic et Jovan Jovicevic. « Alloy formation by Mg underpotential deposition on al from nitrate melts ». Chemical Industry and Chemical Engineering Quarterly 21, n^o 4 (2015) : 527–36. http://dx.doi.org/10.2298/ciceq141205009c.

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Magnesium was underpotentially deposited on aluminium electrodes from magnesium nitrate-ammonium nitrate melts at temperatures ranging from 390 K to 500 K. Electrochemical techniques used were linear sweep voltammetry and potential step. Electrodes were studied by Scanning electron microscopy (SEM), Energy dispersive spectrometry (EDS), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). It was found that reduction processes of nitrate, nitrite and water (when present), in the underpotential range studied, took part simultaneously with magnesium underpotential deposition. Consequently, magnesium UPD reduction and stripping voltammetry peaks were not pronounced and well defined. Nevertheless, EDS, EDX and XRD measurements showed evidence of Mg2Al3, MgAl2 and Al12Mg17 alloys formed by underpotential deposition of magnesium onto aluminium substrate.

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Hashimoto, R., E. S. K. Menon, M. Saunders et A. G. Fox. « Electron Energy-Loss and Energy Dispersive X-Ray Spectros-Copy Studies of Diffusion Bonded Cu-Al2O3 Interfaces ». Microscopy and Microanalysis 3, S2 (août 1997) : 993–94. http://dx.doi.org/10.1017/s1431927600011855.

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The metal-ceramic interface between copper and alumina has been studied by TEM, Electron Energy-Loss Spectroscopy (EELS), and Energy Dispersive X-ray spectroscopy (EDX). of partic-ular interest is the potential role of silicon which is the major impurity in commercial alumina. This investigation focuses on the presence and distribution of silicon within the bulk alumina and at the diffusion bonded CU-AI2O3 interface using a Topcon 002B TEM equipped with an EDAX EDX detector and a Gatan Imaging Filter. The interface was created under vacuum by diffusion bonding of 100/xm copper foils (99.999% purity) pressed between polished alumina substrates (∼99.5% purity) for several hours at ∼90% of the melting temperature of the metal.An initial investigation of the bulk AI2O3 indicated that the majority of the Si occurred at the triple points. A typical example is shown in Fig. la. EDX spectra acquired with a 6nm probe from the center of the junction (Fig. lbi) and at the grain boundary indicate that the Si wets the grain boundary to a limited extent.

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Höhne, Jens, Matthias Bühler, Theo Hertrich et Uwe Hess. « Cryodetectors for High Resolution X-Ray Spectroscopy ». Microscopy and Microanalysis 6, S2 (août 2000) : 740–41. http://dx.doi.org/10.1017/s1431927600036199.

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Based on excellent energy resolution and single quantum detection sensitivity, cryodetectors are offering a variety of new, analytical solutions for the analysis of elementary surface compositions, especially for the analysis of light elements and very small sized structures. Cryodetectors operate typically at temperatures between 30 and 200mK and require vibration free and fully automated cooling systems in order to qualify for industrial applications. Cryodetectors are low temperature superconductors where the two most prominent types are based on microcalorimeter and tunnel diode principles. Cryodetectors are mainly employed for surface analysis applications as energy dispersive X-ray spectrometers with energy resolutions of less than 15eV, but may also be used as highly sensitive UV, VIS or even mass spectrometers in the future.Conventional EDX detectors are semiconductors. An impinging X-ray quantum creates a number of electronhole pairs dependent on the energy of the triggering event thus allowing energy dispersive measurements. The performance limit of semiconductor detectors has almost been reached and is determined by the excitation energy necessary to create electron-hole pairs.

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Zhuiykov, Serge, Eugene Kats, Tomoaki Sato, Hiroshi Ikeda et Norio Miura. « Development of quasi-two-dimensional Nb2O5 nanoflakes with thickness-depended electro-chemical properties ». Functional Materials Letters 08, n^o 01 (février 2015) : 1550007. http://dx.doi.org/10.1142/s1793604715500071.

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Quasi-two-dimensional (Q2D) Nb 2 O 5 nanoflakes were synthesized by combined sol–gel/exfoliation method with the average thickness of 10–25 nm. Their structural, surface- and electro-chemical properties were closely studied and analyzed by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), conductive atomic force microscopy (AFM), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy techniques.

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Álvarez, Loisangela, Blanca Rojas de Gascue, Rolando J. Tremont, Edgar Márquez et Euclides J. Velazco. « Synthesis and Characterization of a New Aluminum-Doped Bismuth Subcarbonate ». Crystals 9, n^o 9 (6 septembre 2019) : 466. http://dx.doi.org/10.3390/cryst9090466.

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A new compound, Bi2O2CO3:Al, was synthesized by the coprecipitation method. The characterization was done by X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), electronic scanning microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). The characterization methods allowed to identify the Bi2O2CO3:Al compound, such as the Al-doped Bi2O2CO3 by XRD, the anionic part (CO32−) by FTIR, and the presence of aluminum in the compound by XPS and EDX. It was confirmed to have a nanostructure like a nanosheet and a microstructure that resembles a type sponge by SEM.

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Wang, Bai Bin, et Wein Duo Yang. « Study of Terbium-Doped Barium Zirconate ( BaZrO₃:Tb³⁺ ) and Cerium-Doped Strontium Zirconate ( SrZrO₃:Ce³⁺ ) and Europium-Doped Calcium Zirconate ( CaZrO₃:Eu³⁺ ) Phosphors ». Advanced Materials Research 679 (avril 2013) : 3–8. http://dx.doi.org/10.4028/www.scientific.net/amr.679.3.

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This Study Successfully Synthesized Terbium-Doped Barium Zirconate Phosphor and Cerium-Doped Strontium Zirconate Phosphor and Europium-Doped Calcium Zirconate Phosphor Using the Sol-Gel Method. we Employed X-Ray Powder Diffraction ( XRD ) and Energy-Dispersive X-Ray Spectroscopy ( EDX ) and Photoluminescence Spectroscopy ( PL ) to Analyze the Crystal Characteristics and Element Composition and Spectral Characteristics of Three Phosphors.

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Holzinger, Angelika, Gregor Neusser, Benjamin J. J. Austen, Alonso Gamero-Quijano, Grégoire Herzog, Damien W. M. Arrigan, Andreas Ziegler, Paul Walther et Christine Kranz. « Investigation of modified nanopore arrays using FIB/SEM tomography ». Faraday Discussions 210 (2018) : 113–30. http://dx.doi.org/10.1039/c8fd00019k.

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FIB/SEM tomography and energy dispersive X-ray (EDX) spectroscopy are employed to study the interface between two immiscible electrolyte solutions at nanopore arrays, which were electrochemically modified by silica.

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AL-Husseini, A. H., B. T. Sih et A. M. Al-Araji. « Green synthesis of iron oxide nanoparticles (Fe₂O₃) using saffron extract ». Journal of Physics : Conference Series 2114, n^o 1 (1 décembre 2021) : 012082. http://dx.doi.org/10.1088/1742-6596/2114/1/012082.

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Abstract In this study, iron oxide nanoparticles were prepared using saffron plant extract, and the prepared particles were diagnosed using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray resolution (EDX), infrared spectroscopy (FTIR) and ultraviolet-visible spectroscopy (UV–Vis). This method falls within the green chemistry, an environmentally friendly method and at a lower cost than other methods

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Ben Abdessalem, M., S. Chkoundali, A. Oueslati et A. Aydi. « AC conductivity and phase transition of the BST–BFO ceramic doped with Yb ». RSC Advances 12, n^o 42 (2022) : 27154–61. http://dx.doi.org/10.1039/d2ra03371b.

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The homogeneity of the 0.8(Ba0.8Sr0.2)TiO3–0.2(Bi0.85Yb0.15)FeO3 ceramic, prepared by a solid-state process, was studied and quantitatively analyzed by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX).

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Agorku, Eric S., Bhekie B. Mamba, Avinash C. Pandey et Ajay K. Mishra. « Sulfur/Gadolinium-Codoped TiO2Nanoparticles for Enhanced Visible-Light Photocatalytic Performance ». Journal of Nanomaterials 2014 (2014) : 1–11. http://dx.doi.org/10.1155/2014/289150.

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A series of S/Gd3+-codoped TiO2photocatalysts were synthesized by a modified sol-gel method. The materials were characterized by X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), UV-visible diffuse reflectance spectroscopy, scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM)/energy-dispersive spectroscopy (EDS). Laboratory experiments with Indigo Carmine chosen as a model for organic pollutants were used to evaluate the photocatalytic performance of S/Gd3+-codoped TiO2under visible-light with varying concentrations of Gd3+ions in the host material. XRD and Raman results confirmed the existence of anatase phase TiO2with particle size ranging from 5 to 12 nm. Codoping has exerted a great influence on the optical responses along with red shift in the absorption edge. S/Gd3+-codoped TiO2showed significant visible-light induced photocatalytic activity towards Indigo Carmine dye compared with S-TiO2or commercial TiO2. TiO2-S/Gd3+(0.6% Gd3+) degraded the dye (ka= 5.6 × 10−2 min−1) completely in 50 min.

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Thèses sur le sujet "Energy X-ray Dispersive Spectroscopy (EDX)"

Canli, Sedat. « Thickness Analysis Of Thin Films By Energy Dispersive X-ray Spectroscopy ». Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612822/index.pdf.

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EDS is a tool for quantitative and qualitative analysis of the materials. In electron microscopy, the energy of the electrons determines the depth of the region where the X-rays come from. By varying the energy of the electrons, the depth of the region where the X-rays come from can be changed. If a thin film is used as a specimen, different quantitative ratios of the elements for different electron energies can be obtained. Unique thickness of a specific film on a specific substrate gives unique energy-ratio diagram so the thickness of a thin film can be calculated by analyzing the fingerprints of the energy-ratio diagram of the EDS data obtained from the film.

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Gharehbaghi, Ali. « Precipitation Study in a High Temperature Austenitic Stainless Steel using Low Voltage Energy Dispersive X-ray Spectroscopy ». Thesis, KTH, Materialens processteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103492.

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Precipitation of second phase particles is a key factor dominating the mechanical properties of high temperature alloys. In order to control and optimize the precipitation effect it is of great importance to study the role of alloying elements in the formation and stability of precipitates. As a favored family of corrosion and creep resistant austenitic stainless steels the 20Cr-25Ni alloy was modified by addition of copper, molybdenum, nitrogen, niobium and vanadium. A set of alloys with similar matrix but varying contents of niobium, vanadium and nitrogen were prepared. Sample preparation process included melting, hot forging, solution annealing and finally aging for 500 h at 700, 800 and 850 ºC.Light optical and scanning electron microscopy revealed micron-scale precipitates on grain and twin boundaries as well as sub-micron intragranular precipitates in all samples. Characterization of precipitates was carried out by means of energy dispersive X-ray spectroscopy (EDS). Among micron-scale precipitates M23C6 carbide was the dominant phase at 700 ºC aging temperature; whereas silicon-rich eta phase (M5SiC) was the main precipitate in samples aged at 800 and 850 ºC. A few sigma phase particles were found in one of the niobium containing samples aged at 700 and 800 ºC. Sub-micron intragranular precipitates were analyzed using low voltage EDS. The spatial resolution of EDS microanalysis at 5 kV accelerating voltage was estimated as almost 100 nm which was at least eight times better than that using the ordinary 20 kV voltage. Also, low voltage EDS revealed the presence of light elements (carbon, nitrogen and boron) in the composition of sub-micron particles thanks to the less matrix effect in absorption of low energy X-rays of light elements. In samples aged at 700 ºC niobium-rich and vanadium-rich carbonitrides were found as the dominant precipitates; whereas they contained much less carbon in samples aged at 800 ºC and mostly became carbon-free nitrides with well-defined cuboidal shapes at 850 ºC aging temperature. This showed that niobium/vanadium-rich nitride phases are stable precipitates at aging temperatures above 700 ºC.The drawbacks of low voltage EDS were indicated as high detection limit (no detection of low- content elements), poor accuracy of quantitative analysis and high sensitivity to surface contamination. Some possible ways to improve the accuracy of low voltage EDS, e.g. longer acquisition time were examined and some other suggestions are proposed for future works.

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Hubbard, Philip J. « Understanding biomineralization of polycaprolactone surfaces ». Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/119039/1/Philip_Hubbard_Thesis.pdf.

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This thesis explored both a method to fabricate new model systems of the gut using 3D printing (Universiteit Utrecht, UU), and the fundamental mechanisms behind a coating process used to improve the qualities of 3D-printed scaffolds for bone regeneration applications (Queensland University of Technology, QUT). More specifically, the projects involved using stereolithography (SLA) technology to produce a "midi-gut" representative of intestinal architecture for cell seeding at UU, and investigating and optimising calcium phosphate coating on polycaprolactone surfaces at QUT. This thesis corresponds to the dual Master in Biofabrication programme, carried out between UU (Utrecht, Netherlands) and QUT (Brisbane, Australia).

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Rueda-Fonseca, Pamela. « Magnetic quantum dots in II-VI semiconductor nanowires ». Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENY015/document.

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Dans ce travail de thèse a été développé et étudié un nouveau type d'objet semiconducteur magnétique : des boîtes quantiques de CdMnTe insérées dans des nanofils de ZnTe/ZnMgTe constituant une structure de type cœur-coquille. L'objectif était d'étudier la croissance par épitaxie par jets moléculaires et les propriétés fondamentales de ces hétéro-structures complexes. Dans ce but deux aspects principaux ont été abordés : i) la qualité et le contrôle des propriétés structurales, électroniques et magnétiques de ces objets, grâce à une maîtrise de leur croissance et ii) l'obtention d'informations quantitatives locales sur la composition chimique de ces nanostructures inhomogènes. Pour atteindre ces objectifs, nous avons divisé notre étude en quatre étapes. La première étape de ce travail a été concentrée sur l'étude quantitative de la formation des particules d'or servant de catalyseurs à la croissance des nanofils. La seconde étape a porté sur l'analyse des mécanismes de croissance et des paramètres gouvernant la croissance des fils de ZnTe. En particulier deux types de fils ont été observés : des fils cylindriques de structure wurtzite et des fils coniques de structures zinc-blende. Un modèle de croissance guidée par la diffusion a été utilisé pour rendre compte de certains des résultats quantitatifs présentés dans cette partie. La troisième étape a concerné l'insertion de boîtes quantiques de CdMnTe dans des nanofils de structure cœur-coquille ZnTe/ZnMgTe. Une étude préalable des paramètres pertinents influençant les propriétés magnéto-optiques de ces objets, tels que le confinement de la boîte quantique, l'incorporation du Mn et l'anisotropie de contrainte créée par la structure, a été menée. La quatrième et dernière étape de ce travail a porté sur l'interprétation quantitative de mesures d'analyse dispersive en énergie effectuées sur des nanofils de structure cœur-multicoquille. Un modèle géométrique a été proposé, permettant de retrouver la forme, les dimensions et la composition chimique des boîtes quantiques et des coquilles. Cette étude a été couplée à des mesures de caractérisation telles que la cathodo-luminescence, la micro-photo-luminescence et la spectroscopie magnéto-optique effectuées sur le même nanofil
In this PhD work a novel type of magnetic semiconductor object has been developed: Cd(Mn)Te quantum dots embedded in ZnTe/ZnMgTe core-shell nanowires. The goal was to investigate the growth, by molecular beam epitaxy, and the fundamental properties of these complex heterostructures. For that purpose, two main issues were addressed: i) gaining control of the structural, electronic and magnetic properties of these quantum objects by mastering their growth; and ii) obtaining quantitative local knowledge on the chemical composition of those non-homogeneous nanostructures. To tackle these topics, our research was divided into four stages. The first stage was devoted to perform a quantitative study of the formation process of the Au particles that catalyze the growth of nanowires. The second stage involved the analysis of the mechanisms and parameters governing the growth of ZnTe nanowires. In particular, two different types of nanowires were found: cone-shaped nanowires with the zinc-blende crystal structure and cylinder-shaped nanowires with the hexagonal wurtzite structure. A diffusion-driven growth model is employed to fit some of the quantitative results presented in this part. The third stage focused on the insertion of pure CdTe quantum dots containing Mn ions in the core-shell nanowires. An initial study of the relevant parameters influencing the magneto-optical properties of these objects, such as the quantum dot confinement, the Mn incorporation, and the strain anisotropy, was performed. The four and last stage of this work concerned the quantitative interpretation of Energy-Dispersive X-ray spectroscopy measurements performed on single core-multishell nanowires. A geometrical model was proposed to retrieve the shape, the size and the local composition of the quantum dot insertions and of the multiple layers of the heterostructures. This study was coupled to other complementary characterization measurements on the same nanowire, such as cathodo-luminescence, micro-photo-luminescence and magneto-optical spectroscopy

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Lepinay, Kevin. « Développement et applications de la tomographie chimique par spectroscopie EDX ». Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0124/document.

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Cette thèse porte sur l’évaluation des techniques pour la tomographie chimique par STEM EDX : mise au point des procédures expérimentales, traitement des données, reconstruction des volumes, analyse de la qualité des résultats obtenus et évaluation de la complexité globale. Les performances très limitées de l’analyse STEM EDX font que peu d’études, jusqu’à aujourd’hui, se sont portées sur cette technique. Cependant, les avancées très notables procurées par les nouveaux détecteurs ‘SDD’ ainsi que les sources électroniques X-FEG haute brillance, rendant l’analyse STEM EDX 2D très rapide, ont relancé la possibilité de la tomographie chimique ; la technique demande toutefois à être mise au point et évaluée (performances et complexité). Nous avons travaillé sur un microscope Tecnai Osiris permettant d’acquérir des cartographies chimiques EDX de centaines de milliers de pixels avec une résolution de l’ordre du nanomètre en quelques minutes. Nous avons choisi de préparer par FIB des échantillons en forme de pointe et d’utiliser un porte-objet permettant une exploration angulaire de 180° sans ombrage. Puis, à l’aide d’échantillons modèles (billes de SiO2 dans une résine), nous avons évalué les déformations d’échantillon par l’irradiation du faisceau électronique. Ceci nous a permis de proposer une méthode pour limiter cet effet par déposition d’une couche de 20 nm de chrome. Des simulations d’images ont permis d’évaluer les logiciels et méthodes de reconstruction. La méthodologie de chaque étape d’une analyse de tomographie STEM EDX a ensuite été expliquée, et l’intérêt de la technique démontré grâce à la comparaison de l’analyse 2D et 3D d’un transistor FDSOI 28 nm. La qualité des reconstructions (rapport signal-sur-bruit, résolution spatiale) a été évaluée en fonction des paramètres expérimentaux à l’aide de simulations et d’expériences. Une résolution de 4 nm est démontrée grâce à l’analyse d’une mire et d’un transistor « gate all around ». Pour ce même transistor, la possibilité et l’intérêt d’analyse de défaillance à l’échelle nanométrique est prouvée. Une analyse d’un défaut de grille d’une SRAM ou de trous dans un pilier en cuivre permettent d’expliquer l’intérêt d’une combinaison d’un volume HAADF (morphologie et résolution < 4 nm) et du volume EDX (information chimique). La conclusion est que cette technique, qui reste encore à améliorer du point de vue de sa simplicité, montre déjà son utilité pour l’analyse et la mise au point des technologies avancées (nœud 20 nm et après)
This thesis focuses on the evaluation of the STEM EDX chemical tomography technique: development of experimental procedures, data processing and volumes reconstruction, quality analysis of the results and evaluation of the overall complexity. Until now, STEM EDX analysis performances were very limited, so only few studies about this technique have been realized. However, very significant progress procured by the new SDD detectors as well as by the high brightness electronic sources (X-FEG), making the STEM EDX 2D analysis very fast, have revived the possibility of the chemical tomography, although the technique has to be developed and evaluated (performance and complexity). We have worked on a Tecnai Osiris which acquires EDX chemical mapping of hundreds of thousands of pixels with resolution of one nanometer and in a few minutes. We chose to prepare the rod-shaped samples by FIB and use a sample holder allowing an angle of exploration of 180° without shadowing effects. Then, using model samples (SiO2 balls in resin), we evaluated the sample deformation due to the electron beam irradiation. This allowed us to propose a method to reduce this effect by depositing a 20 nm chromium layer. Images simulations were used to evaluate the software and the reconstruction methods. The methodology of each step of the STEM EDX tomography analysis is then explained and the technique interest is demonstrated by comparing the 2D and the 3D analysis of a transistor 28 nm FDSOI. The quality of the reconstructions (signal-to-noise ratio, spatial resolution) was evaluated, in function of experimental parameters, using simulations and experiments. A resolution of 4 nm is demonstrated through the analysis of a test pattern and a "gate all around” transistor. For the same transistor, the possibility and the interest of a failure analysis at the nanoscale is proven. Analyses of a SRAM gate fail or of the holes in a copper pillar explain the benefits of a combination between a HAADF volume (morphology and resolution < 4 nm) and an EDX volume (chemical information). To conclude, this technique, which still needs to be improved in terms of simplicity, is already showing its usefulness for the analysis and the development of advanced technologies (20nm node and beyond)

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Ozaslan, Mehtap, Wei Liu, Maarten Nachtegaal, Anatoly Frenkel, Bogdan Rutkowski, Matthias Werheid, Anne-Kristin Herrmann et al. « Homogeneity and Elemental Distribution in Self-Assembled Bimetallic Pd-Pt Aerogels prepared by a spontaneous one-step gelation process ». Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-210970.

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Multi-metallic aerogels have recently emerged as a novel and promising class of unsupported electrocatalyst materials due to their high catalytic activity and improved durability for various electrochemical reactions. Aerogels can be prepared by a spontaneous one-step gelation process, where the chemical co-reduction of metal precursors and the prompt formation of the nanochain-consisting hydrogels, as a preliminary stage for the preparation of aerogels take place. However, detailed knowledge about the homogeneity and chemical distribution of these three-dimensional Pd-Pt aerogels at the nano-scale as well as at the macro-scale is still unclear to date. Therefore, we used a combination of spectroscopic and microscopic techniques to obtain a better insight into the structure and elemental distribution of the various Pd-rich Pd-Pt aerogels prepared by the spontaneous one-step gelation process. Synchrotron-based extended X-ray absorption fine structure (EXAFS) spectroscopy and high-angle annular dark-field (HAADF) scanning transmission electron microscopy (STEM) in combination with energy-dispersive X-ray spectroscopy (EDX) were employed in this work to uncover the structural architecture and chemical composition of the various Pd-rich Pd-Pt aerogels over a broad length range. The Pd80Pt20, Pd60Pt40 and Pd50Pt50 aerogels showed heterogeneity in the chemical distribution of the Pt and Pd atoms inside the macroscopic nanochain-network. Features of monometallic clusters were not detected by EXAFS or STEM-EDX, indicating alloyed nanoparticles. However, the local chemical composition of the Pd-Pt alloys strongly varied along the nanochains and thus within a single aerogel. To determine the electrochemically active surface area (ECSA) of the Pd-Pt aerogels for applications in electrocatalysis, we used the electrochemical CO stripping method. Due to high porosity and extended network structure, the resulting values of the ECSA for the Pd-Pt aerogels were higher than that for a commercially available unsupported Pt black catalyst. We show that the Pd-Pt aerogels possess a high utilization of catalytically active centers for electrocatalytic applications based on the nanostructured bimetallic framework. Knowledge about the homogeneity and chemical distribution of the bimetallic aerogels can help to further optimize their preparation by the spontaneous one-step gelation process and to tune their electrocatalytic reactivity.

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Lu, Shifeier. « Analytical study of osteoporosis of maxilla in ovariectomized rats ». Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/88474/1/Shifeier_Lu_Thesis.pdf.

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The project applied analytical facilities to characterize the composition and mechanical properties of osteoporosis in maxillary bone using an ovariectomized rat model. It was found that osteoporotic jaw bone contained different amount of trace elements in comparison with the normal bone, which plays a significant role in bone quality. The knowledge generated from the study will assist the treatment of jaw bone fracture and dental implant placement.

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Fairbrother, P. J. « Thermal diffuse scattering in energy-dispersive x-ray spectroscopy ». Thesis, University of Exeter, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.232967.

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Vídeňský, Ondřej. « Analýza bateriových hmot metodami EDS ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399522.

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This master thesis deals with analysis of battery mass using x-ray spectral microanalysis. For the measurement two scanning electron microscopes equipped with energy dispersive x-ray spectroscopes were used. Appropriate examples were prepaired by standard method. Then elemental analysis was performed with changing conditions of measurement. Two programs were used for spectrums evaluation and in the end the size of errors was observed for every conditions.

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Kleinhans, Henrik. « Evaluation of the Carbonization of Thermo-Stabilized Lignin Fibers into Carbon Fibers ». Thesis, Linköpings universitet, Kemi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-120519.

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Thermo-stabilized lignin fibers from pH-fractionated softwood kraft lignin were carbonized to various temperatures during thermomechanical analysis (TMA) under static and increasing load and different rates of heating. The aim was to optimize the carbonization process to obtain suitable carbon fiber material with good mechanical strength potential (high tensile strength and high E-modulus). The carbon fibers were therefore mainly evaluated of mechanical strength in Dia-Stron uniaxial tensile testing. In addition, chemical composition, in terms of functional groups, and elemental (atomic) composition was studied in Fourier transform infrared spectroscopy (FTIR) and in energy-dispersive X-ray spectroscopy (EDS), respectively. The structure of carbon fibers was imaged in scanning electron microscope (SEM) and light microscopy. Thermogravimetrical analysis was performed on thermo-stabilized lignin fibers to evaluate the loss of mass and to calculate the stress-changes and diameter-changes that occur during carbonization. The TMA-analysis of the deformation showed, for thermo-stabilized lignin fibers, a characteristic behavior of contraction during carbonization. Carbonization temperatures above 1000°C seemed most efficient in terms of E-modulus and tensile strength whereas rate of heating did not matter considerably. The E-modulus for the fibers was improved significantly by slowly increasing the load during the carbonization. The tensile strength remained however unchanged. The FTIR-analysis indicated that many functional groups, mainly oxygen containing, dissociate from the lignin polymers during carbonization. The EDS supported this by showing that the oxygen content decreased. Accordingly, the relative carbon content increased passively to around 90% at 1000°C. Aromatic structures in the carbon fibers are thought to contribute to the mechanical strength and are likely formed during the carbonization. However, the FTIR result showed no evident signs that aromatic structures had been formed, possible due to some difficulties with the KBr-method. In the SEM and light microscopy imaging one could observe that porous formations on the surface of the fibers increased as the temperature increased in the carbonization. These formations may have affected the mechanical strength of the carbon fibers, mainly tensile strength. The carbonization process was optimized in the sense that any heating rate can be used. No restriction in production speed exists. The carbonization should be run to at least 1000°C to achieve maximum mechanical strength, both in E-modulus and tensile strength. To improve the E-modulus further, a slowly increasing load can be applied to the lignin fibers during carbonization. The earlier the force is applied, to counteract the lignin fiber contraction that occurs (namely around 300°C), the better. However, in terms of mechanical performance, the lignin carbon fibers are still far from practical use in the industry.

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Livres sur le sujet "Energy X-ray Dispersive Spectroscopy (EDX)"

Energy dispersive x-ray fluorescence analysis. Warszawa : PWN, 1989.

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Italy) European Conference on Energy Dispersive X-Ray Spectrometry (1998 Bologna. Proceedings of the European Conference on Energy Dispersive X-Ray Spectrometry 1998 : EDXRS-98 : San Giovanni in Monte, Bologna, Italy, 7-12 June 1998. Bologna : Compositori, 1999.

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C, Jackson John. A method of quantitative analysis of trace elements in silicate rocks by energy-dispersive X-ray fluorescence spectroscopy. [Denver, Colo.?] : U.S. Dept. of the Interior, Geological Survey, 1988.

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Jackson, John C. A method of quantitative analysis of trace elements in silicate rocks by energy-dispersive X-ray fluorescence spectroscopy. [Denver, Colo.?] : U.S. Dept. of the Interior, Geological Survey, 1988.

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Budd, P. M. Light-element analysis in the transmission electron microscope, WEDX and EELS. Oxford : Oxford University Press, 1988.

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1943-, Goodhew Peter J., et Royal Microscopical Society, dir. Light-element analysis in the transmission electron microscope. Oxford : Oxford University Press (for) Royal Microscopical Society, 1988.

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Frs, M. Ashby, John C. Russ, R. Kiessling et J. Charles. Fundamentals of Energy Dispersive X-Ray Analysis : Butterworths Monographs in Materials. Elsevier Science & Technology Books, 2013.

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Ressler, Thorsten. Application of energy-dispersive X-ray absorption spectroscopy in heterogeneous catalysis : Exfoliation of graphite intercalation compounds and oscillatory behaviour in the CO oxidation. 1995.

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Chapitres de livres sur le sujet "Energy X-ray Dispersive Spectroscopy (EDX)"

Schneider, Reinhard. « Energy-Dispersive X-Ray Spectroscopy (EDXS) ». Dans Surface and Thin Film Analysis, 293–310. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527636921.ch18.

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Sarkar, Purbasha, Manish R. Shukla, Priyanka Kumbhar, Suvarna Manjre, Santanu Dasgupta et Vishnupriya Bhakthavatsalam. « Intracellular Localization of Micronutrients in Algae Cells Using Scanning Transmission Electron Microscopy–Energy-Dispersive X-ray Spectroscopy (STEM-EDX) ». Dans Applications of Microscopy in Materials and Life Sciences, 203–10. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2982-2_20.

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Shindo, Daisuke, et Tetsuo Oikawa. « Energy Dispersive X-ray Spectroscopy ». Dans Analytical Electron Microscopy for Materials Science, 81–102. Tokyo : Springer Japan, 2002. http://dx.doi.org/10.1007/978-4-431-66988-3_4.

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Mathon, Olivier, Innokenty Kantor et Sakura Pascarelli. « Time-Resolved XAS Using an Energy Dispersive Spectrometer : Techniques and Applications ». Dans X-Ray Absorption and X-Ray Emission Spectroscopy, 185–212. Chichester, UK : John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118844243.ch8.

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Marotta, Roberto, A. Falqui, A. Curcio, A. Quarta et Teresa Pellegrino. « Immunocytochemistry, Electron Tomography, and Energy Dispersive X-ray Spectroscopy (EDXS) on Cryosections of Human Cancer Cells Doped with Stimuli Responsive Polymeric Nanogels Loaded with Iron Oxide Nanoparticles ». Dans Nanomaterial Interfaces in Biology, 179–98. Totowa, NJ : Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-462-3_14.

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Marshall, James L. « Scanning Electron Microscopy and Energy Dispersive X-ray (SEM/EDX) Characterization of Solder Solderability and Reliability ». Dans Solder Joint Reliability, 173–224. Boston, MA : Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3910-0_6.

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Carpinteri, A., A. Chiodoni, A. Manuello et R. Sandrone. « Energy dispersive X-ray spectroscopy analysis on rock samples subjected to piezonuclear tests ». Dans Experimental Mechanics on Emerging Energy Systems and Materials, Volume 5, 49–56. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9798-2_7.

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Rickerby, D. G. « Application of Low Voltage Scanning Electron Microscopy and Energy Dispersive X-Ray Spectroscopy ». Dans Impact of Electron and Scanning Probe Microscopy on Materials Research, 367–85. Dordrecht : Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4451-3_16.

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Fontaine, Alouin, Elisabeth Dartyge, Jean Paul Itie, Alain Jucha, Alain Polian, Helio Tolentino et Gerard Tourillon. « Time-resolved X-ray absorption spectroscopy using an energy dispersive optics : Strengths and limitations ». Dans Synchrotron Radiation in Chemistry and Biology III, 179–203. Berlin, Heidelberg : Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/3540512012_17.

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Cerón Loayza, María L., et Jorge A. Bravo Cabrejos. « Characterization of the Carancas–Puno meteorite by energy dispersive X-ray fluorescence, X-ray diffractometry and transmission Mössbauer spectroscopy ». Dans LACAME 2010, 175–81. Dordrecht : Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-4301-4_23.

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Actes de conférences sur le sujet "Energy X-ray Dispersive Spectroscopy (EDX)"

Ma, Man Man Mani, Ze Zhu et Yan Cheong Chan. « Environmental impact analysis of smartwatch using SimaPro8 tools and energy dispersive X-ray spectroscopy (EDX) technique ». Dans 2017 IEEE 19th Electronics Packaging Technology Conference (EPTC). IEEE, 2017. http://dx.doi.org/10.1109/eptc.2017.8277438.

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Simmnacher, B., R. Weiland, E. Langer, M. Bühler, J. Höhne et C. Hollerith. « Microcalorimeter Energy Dispersive X-Ray Spectroscopy in Routine Semiconductor Failure Analysis ». Dans ISTFA 2002. ASM International, 2002. http://dx.doi.org/10.31399/asm.cp.istfa2002p0087.

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Abstract Microcalorimeter based energy dispersive X-ray analysis (EDS) combines in a revolutionary way resolution of wavelength dispersive spectroscopy (WDS) with the ease of use of conventional EDS. The necessary operating temperatures (~100mK) for the superconducting sensor are supplied by a mechanical, maintenance free and fully automated cooling system, allowing the integration of the system not only in a traditional F/A environment, but also as an inline (cleanroom) installation. Typical examples of material analysis in everyday F/A work show that the detector exhibits an energy resolution of about 10 eV. With this performance, the solution of well known overlap problems existing for element combinations commonly used in semiconductor technology (peak separation of Ti/N, Ta/Si, W/Si) is possible. Structures of small volume can be investigated successfully, since the tool is optimized for work in the low energy range. The case of a failing TiN-layer showed that μcalorimeter EDS allows also thin film analysis: oxide layers with a thickness difference of a few nm can be distinguished; subsequent depth-profiling with Auger electron spectroscopy confirmed the results.

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Blalock, Travis, Xiao Bai et Afsaneh Rabiei. « Effect of Substrate Temperature on Properties of Nano-Scale Functionally Graded Calcium Phosphate Coatings ». Dans ASME 2006 International Manufacturing Science and Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/msec2006-21047.

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The effect of substrate temperature and processing parameters on microstructure and crystallinity of calcium phosphate coatings deposited on heated substrates in an Ion Beam Assisted Deposition (IBAD) system are being studied. The experimental procedures include mechanical testing and film thickness measurements using bonding strength and profilometery. Cross-sectional scanning transmission electron microscopy (STEM) with energy dispersive X-ray spectroscopy (EDX) through the thickness of the film as well as scanning electron microscopy (SEM) with EDX at the top surface of the film was performed to evaluate the microstructure of the film. The coating crystallinity was studied through X-ray diffraction (XRD). The information gained from current analysis on the set temperature coatings will be used to refine the processing techniques of the Functionally Graded Hydroxyapatite (FGHA) coating.

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Singh, Gurpreet, Hazoor Singh et Buta Singh Sidhu. « Characterisation and In Vitro Corrosion Resistance of Plasma-Sprayed Hydroxyapatite and Hydroxyapatite–Silicon Oxide Coatings on 316L SS ». Dans ITSC2015, sous la direction de A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen et C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0941.

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Abstract In the current investigation plasma spray technique was used for depositing hydroxyapatite (HA) and hydroxyapatite – silicon oxide (SiO2) coatings on 316L SS substrate. In HA-SiO2 coating, 20 wt% SiO2 was mixed with HA. The feedstock and coatings were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) / energy-dispersive X-ray spectroscopy (EDX) analyses. The corrosion resistance of the uncoated, HA coated and HA + 20 wt% SiO2 coated 316L SS was investigated by electrochemical corrosion testing in simulated human body fluid (Ringer’s solution). After the corrosion testing, the samples were analyzed by XRD and SEM / EDX analyses. The addition of SiO2 reduces the crystallinity of the coating. The corrosion resistance of the 316L SS was found to increase after the deposition of the HA + 20 wt% SiO2 and HA coatings.

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Vanderlinde, William E., et Don Chernoff. « X-Ray Nanoanalysis in the SEM ». Dans ISTFA 2005. ASM International, 2005. http://dx.doi.org/10.31399/asm.cp.istfa2005p0370.

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Abstract Scanning electron microscopy (SEM)/energy dispersive x-ray spectroscopy (EDS) is generally thought of as a bulk analysis technique that is not suited for nano-scale analysis. This paper discusses several options for reducing or eliminating the interaction volume size and obtaining x-ray data with much higher spatial resolution and surface sensitivity than is typically achieved in the SEM. These include collecting data at very low accelerating voltages to minimize beam spread in the sample, tilting the sample to keep the interaction volume near the surface, and analyzing thin sections to reduce or eliminate the problem of beam spread in the sample. Computer software simulations, in conjunction with experimental data are used to illustrate these methods. The paper also discusses issues effecting EDS analysis in the environmental SEM. It has been shown that computer modeling is a useful tool for determining the optimum beam conditions to improve energy dispersive analysis in the SEM.

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Zhu, Jie, Yi Qiang Shen et Si Ping Zhao. « Chemical analysis of semiconductor devices using TEM energy-dispersive X-ray spectroscopy (EDS) and electron energy-loss spectroscopy (EELS) ». Dans 2016 IEEE 23rd International Symposium on the Physical and Failure Analysis of Integrated Circuits (IPFA). IEEE, 2016. http://dx.doi.org/10.1109/ipfa.2016.7564254.

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Roller, Justin, Zhenxin Zhong, Michael Strauss, Oleksii Bidiuk, Jeff Blackwood, Martin Verheijen, Ozan Ugurlu et Jason Donald. « Automation to Enable Energy Dispersive X-ray Spectroscopy for High Throughput Failure Analysis and Metrology ». Dans ISTFA 2017. ASM International, 2017. http://dx.doi.org/10.31399/asm.cp.istfa2017p0386.

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Abstract Automated S/TEM (auto-S/TEM) and by extension automated energy dispersive x-ray spectroscopy (auto-EDS) enable the collection of large volumes of data that historically was not feasible on a sustained basis using manual S/TEM operation. Automation removes variabilities attributed to operator training and bias while enabling repeatable, precise, and consistent data. This paper examines general considerations for high volume and auto-EDS metrology. Maps are evaluated relative to analysis time and the requisite signal-to-noise (SNR) necessary for adequate measurement precision. Auto-EDS parameters (dwell time and mapping time) were investigated to maximize EDS net counts and SNR for throughput. A methodology was presented to monitor the SNR ratio of critical dimensions which can be extended to further understand the minimum value needed to maintain an acceptable measurement precision. It is important to further study other means of increasing the SNR, such as beam current, accelerating voltage, and larger solid-angle detectors.

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An, Ping, Yandong He, Shitao Wang, Yanping Bai et Yilong Hao. « Failure Investigation and Analysis of Abnormal Capacitance of Accelerometer After ICP Release ». Dans 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2008. http://dx.doi.org/10.1115/micronano2008-70201.

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An abnormal capacitance case of capacitive accelerometer after inductive coupled plasma (ICP) release was investigated to solve the failure problem. scanning electron microscopy (SEM)/transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDX), X-Ray transmission inspection, epoxy resin filling/polishing were used to identify the possible root cause. Failure analysis results confirmed that abnormal capacitance occurred by some connecting combs. Based on the results of three ways to analysis, it was concluded that the abnormal capacitance was not due to the contamination between combs of accelerometer and the substrate, but due to the connection between some combs caused by the ICP etching ununiformity. The static capacitance and resistance test results also testified this conclusion.

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Hage, Ilige S., Ré-Mi Hage, Charbel Y. Seif et Ramsey F. Hamade. « Relating Bone Intra-Cortical Elastic Stiffness to EDX Spectroscopy Mineralization Measurements ». Dans ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86233.

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It is widely recognized that bone mineral content is a main contributor to cortical bone stiffness. Previous works by the authors revealed that stiffness of mid-diaphysis cortical bone increases with increasing radial position from interior to exterior regions. In this work, we correlate this radial cortical stiffness to the chemical composition of several bone rings cut from 2-year old bovine cow femur (collected fresh from butcher). This mineralization is quantified using energy-dispersive X-ray (EDX) spectroscopy. On each bone ring, five regions are assigned along a 4 mm radial line covering the entire cortical wall thickness. Locations along the radial distance are assigned to acquire the chemical analysis spectrum. Calcium (Ca) and Phosphorus (P) elements chemical elements are traced/detected. Measured mineralization results are expressed as per weight percent concentration (wt %). These elemental results for Calcium (Ca) and Phosphorus (P) are correlated to radial position and stiffness values using statistical analysis (SPSS®). Calcium (Ca) and Phosphorus (P) elements were positively correlated with stiffness values and radius whilst Ca/P ratio was almost constant with the radius. Findings suggest that with increasing radius, Ca (wt%) and P (wt %) showed a fairly increasing trend that correlates to increasing stiffness values proving that increased bone mineralization would contribute to cortical bone stiffness.

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Li, J., K. Brew, K. Cheng, V. Chan, N. Arnold, A. Gasasira, R. Pujari et al. « Low Angle Annular Dark Field Scanning Transmission Electron Microscopy Analysis of Phase Change Material ». Dans ISTFA 2021. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.istfa2021p0206.

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Abstract In this work, we investigate mushroom type phase-change material (PCM) memory cells based on Ge2Sb2Te5. We use low-angle annular dark field (LAADF) STEM imaging and energy dispersive X-ray spectroscopy (EDX) to study changes in microstructure and elemental distributions in the PCM cells before and after SET and RESET conditions. We describe the microscope settings required to reveal the amorphous dome in the RESET state and present an application example involving the failure analysis of a PCM test array made with devices fabricated at IBM’s Albany AI Hardware Research Center.

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Rapports d'organisations sur le sujet "Energy X-ray Dispersive Spectroscopy (EDX)"

Friedrich, S., T. Niedermayr, O. Drury, T. Funk, M. Frank, S. E. Labov et S. Cramer. Superconducting Detector System for High-Resolution Energy-Dispersive Soft X-Ray Spectroscopy. Office of Scientific and Technical Information (OSTI), février 2001. http://dx.doi.org/10.2172/15013583.

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Drummond, J. L., A. D. Steinberg et A. R. Krauss. X-ray photo-emission and energy dispersive spectroscopy of HA coated titanium. Office of Scientific and Technical Information (OSTI), août 1997. http://dx.doi.org/10.2172/510589.

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Lacerda Silva, P., G. R. Chalmers, A. M. M. Bustin et R. M. Bustin. Gas geochemistry and the origins of H2S in the Montney Formation. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329794.

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The geology of the Montney Formation and the geochemistry of its produced fluids, including nonhydrocarbon gases such as hydrogen sulfide were investigated for both Alberta and BC play areas. Key parameters for understanding a complex petroleum system like the Montney play include changes in thickness, depth of burial, mass balance calculations, timing and magnitudes of paleotemperature exposure, as well as kerogen concentration and types to determine the distribution of hydrocarbon composition, H2S concentrations and CO2 concentrations. Results show that there is first-, second- and third- order variations in the maturation patterns that impact the hydrocarbon composition. Isomer ratio calculations for butane and propane, in combination with excess methane estimation from produced fluids, are powerful tools to highlight effects of migration in the hydrocarbon distribution. The present-day distribution of hydrocarbons is a result of fluid mixing between hydrocarbons generated in-situ with shorter-chained hydrocarbons (i.e., methane) migrated from deeper, more mature areas proximal to the deformation front, along structural elements like the Fort St. John Graben, as well as through areas of lithology with higher permeability. The BC Montney play appears to have hydrocarbon composition that reflects a larger contribution from in-situ generation, while the Montney play in Alberta has a higher proportion of its hydrocarbon volumes from migrated hydrocarbons. Hydrogen sulphide is observed to be laterally discontinuous and found in discrete zones or pockets. The locations of higher concentrations of hydrogen sulphide do not align with the sulphate-rich facies of the Charlie Lake Formation but can be seen to underlie areas of higher sulphate ion concentrations in the formation water. There is some alignment between CO2 and H2S, particularly south of Dawson Creek; however, the cross-plot of CO2 and H2S illustrates some deviation away from any correlation and there must be other processes at play (i.e., decomposition of kerogen or carbonate dissolution). The sources of sulphur in the produced H2S were investigated through isotopic analyses coupled with scanning electron microscopy, energy dispersive spectroscopy, and mineralogy by X-ray diffraction. The Montney Formation in BC can contain small discrete amounts of sulphur in the form of anhydrite as shown by XRD and SEM-EDX results. Sulphur isotopic analyses indicate that the most likely source of sulphur is from Triassic rocks, in particular, the Charlie Lake Formation, due to its close proximity, its high concentration of anhydrite (18-42%), and the evidence that dissolved sulphate ions migrated within the groundwater in fractures and transported anhydrite into the Halfway Formation and into the Montney Formation. The isotopic signature shows the sulphur isotopic ratio of the anhydrite in the Montney Formation is in the same range as the sulphur within the H2S gas and is a lighter ratio than what is found in Devonian anhydrite and H2S gas. This integrated study contributes to a better understanding of the hydrocarbon system for enhancing the efficiency of and optimizing the planning of drilling and production operations. Operators in BC should include mapping of the Charlie Lake evaporites and structural elements, three-dimensional seismic and sulphate ion concentrations in the connate water, when planning wells, in order to reduce the risk of encountering unexpected souring.

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