Bibliografie tematiche / Quantification de la graisse

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Letteratura scientifica selezionata sul tema "Quantification de la graisse"

Autore: Grafiati
Pubblicato: 15 febbraio 2025

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Articoli di riviste sul tema "Quantification de la graisse"

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Sottier, D., J. M. Petit, S. Guiu, S. Hamza, H. Benhamiche, P. Hillon, J. P. Cercueil, D. Krausé e B. Guiu. "Quantification de la graisse viscérale et sous-cutanée au scanner : corrélation inter-observateur d’une technique monocoupe". Journal de Radiologie Diagnostique et Interventionnelle 94, n. 9 (settembre 2013): 889–94. http://dx.doi.org/10.1016/j.jradio.2013.02.019.

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Buscarnera, Giuseppe, Changbum Sohn e Dawa Seo. "Quantification of grain breakage during creep based on X-ray microtomography". E3S Web of Conferences 205 (2020): 09004. http://dx.doi.org/10.1051/e3sconf/202020509004.

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Abstract (sommario):
Delayed compression is among the leading causes of long-term deterioration in granular systems, especially when it is mediated by the action of pore fluids. This time-dependent process is often classified as ‘creep’, a term conveying time-dependence without specifying the causes of deformation. This paper presents a methodology based on X-ray synchrotron microtomography to track delayed microstructural changes in compacted sand. Experiments on materials characterized by different grain size and shape have been designed to measure macroscopic variables such as strain rate, as well as to visualize the topological and morphological alterations of the constituting particles. The results reveal that non-negligible inelastic processes such as grain breakage manifest during the first stages of loading, as well as during the ensuing constant-stress delayed compaction. A substantial role of the grain morphology was detected in both stages. Specifically, while samples made of angular grains displayed early breakage due to the exacerbated fragility of the particles, specimens made of rounded grains did not develop a markedly polydisperse structure prior to creep, which led to comparably more intense delayed fracturing. Furthermore, samples consisting of round grains were also found to exhibit more intense shape alterations, with morphological indicators that tended to converge over time towards those of initially angular grains. These results suggest that characterization and simulation of creep in granular media need to encompass a variety of microscopic processes controlled by grain-scale properties, thus requiring multi-scale testing and modelling techniques.
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Ullah, Riaz, Shabir Ahmad, Aimen Atiq, Hidayat Hussain, Najeeb ur Rehman, Naser M. AbdElsalam e Muhammad Adnan. "QUANTIFICATION AND ANTIBACTERIAL ACTIVITY OF FLAVONOIDS IN COFFEE SAMPLES". African Journal of Traditional, Complementary and Alternative Medicines 12, n. 4 (27 giugno 2015): 84–86. http://dx.doi.org/10.21010/ajtcam.v12i4.13.

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Background: Flavonoids are the phenolic substances widely found in fruits, vegetables, grains, bark, roots, stems, flowers, tea and coffee. Methodology: In the current study quantity of flavonoids and antibacterial activities were determined in different coffee samples namely Nescafe classic, Nescafe gold, Nescafe martina, original, creamy and cafe soluvel by using standard methodology available in literature. Results: Nescafe original and gold showed highest content of flavonoid while cafe soluvel showed lowest content of flavonoid. Cafe soluvel, gold and classic showed good antibacterial activities. Conclusion: This study showed that coffee is good source of flavonoids and had excellent antibacterial potential.
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MILLS, P. A., R. G. ROTTER e R. R. MARQUARDT. "MODIFICATION OF THE GLUCOSAMINE METHOD FOR THE QUANTIFICATION OF FUNGAL CONTAMINATION". Canadian Journal of Animal Science 69, n. 4 (1 dicembre 1989): 1105–6. http://dx.doi.org/10.4141/cjas89-128.

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Modifications to the glucosamine (GlcN) analysis method for the quantification of fungal material in cereal grains are described. The modifications improve recovery of GlcN, increase reliability of the method and reduce analytical time. Key words: Glucosamine, fungal material, grain
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Birsan, Rares I., Peter Wilde, Keith W. Waldron e Dilip K. Rai. "Recovery of Polyphenols from Brewer’s Spent Grains". Antioxidants 8, n. 9 (7 settembre 2019): 380. http://dx.doi.org/10.3390/antiox8090380.

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The recovery of antioxidant polyphenols from light, dark and mix brewer’s spent grain (BSG) using conventional maceration, microwave and ultrasound assisted extraction was investigated. Total polyphenols were measured in the crude (60% acetone), liquor extracts (saponified with 0.75% NaOH) and in their acidified ethyl acetate (EtOAc) partitioned fractions both by spectrophotometry involving Folin–Ciocalteu reagent and liquid-chromatography-tandem mass spectrometry (LC-MS/MS) methods. Irrespective of the extraction methods used, saponification of BSG yielded higher polyphenols than in the crude extracts. The EtOAc fractionations yielded the highest total phenolic content (TPC) ranging from 3.01 ± 0.19 to 4.71 ± 0.28 mg gallic acid equivalent per g of BSG dry weight. The corresponding total polyphenols quantified by LC-MS/MS ranged from 549.9 ± 41.5 to 2741.1 ± 5.2 µg/g of BSG dry weight. Microwave and ultrasound with the parameters and equipment used did not improve the total polyphenol yield when compared to the conventional maceration method. Furthermore, the spectrophotometric quantification of the liquors overestimated the TPC, while the LC-MS/MS quantification gave a closer representation of the total polyphenols in all the extracts. The total polyphenols were in the following order in the EtOAc fractions: BSG light > BSG Mix > BSG dark, and thus suggested BSG light as a sustainable, low cost source of natural antioxidants that may be tapped for applications in food and phytopharmaceutical industries.
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Noma, Satoshi, Yosuke Kikuchi, Megumi Satou, Tomoki Tanaka, Toshiyuki Takiya, Hideki Okusu, Satoshi Futo, Reona Takabatake, Kazumi Kitta e Junichi Mano. "Simple, Precise, and Less Biased GMO Quantification by Multiplexed Genetic Element-Specific Digital PCR". Journal of AOAC INTERNATIONAL 105, n. 1 (9 ottobre 2021): 159–66. http://dx.doi.org/10.1093/jaoacint/qsab138.

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Abstract Background To provide the consumer with choices of genetically modified organisms (GMO) or non-GMO, official food labeling systems were established in many countries. Because the threshold GMO content values were set to distinguish between “non-GMO” and “GMO” designations, GMO content quantification methods are required for ensuring the appropriateness of labeling. Objective As the number of GMOs is continuously increasing around the world, we set out to develop a low-cost, simple and less biased analytical strategy to cover all necessary detection targets. Methods Digital PCR methods are advantageous compared to the conventional quantitative real-time PCR methods. We developed a digital PCR-based GMO quantification method to evaluate the GMO content in maize grains. To minimize the analytical workload, we adopted multiplex digital PCR targeting the 35S promoter and the nopaline synthase terminator, which are genetic elements commonly introduced in many GMOs. Results Our method is significantly simpler and more precise than the conventional real-time PCR-based methods. Additionally, we found that this method enables quantification of the copy number of GMO DNA without double counting multiple elements (35S promoter and nopaline synthase terminator) tandemly placed in a recombinant DNA construct. Conclusion This is the first report on the development of a genetically modified maize quantification method using a multiplexed genetic element-specific digital PCR method. The tandem effect we report here is quite useful for reducing the bias in the analytical results. Highlights Multiplexed genetic element-specific digital PCR can simplify weight-based GMO quantification and thus should prove useful in light of the continuous increase in the number of GM events.
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Živković, Andrej, Dejan Gođevac, Blaž Cigić, Tomaž Polak e Tomaž Požrl. "Identification and Quantification of Selected Benzoxazinoids and Phenolics in Germinated Spelt (Triticum spelta)". Foods 12, n. 9 (24 aprile 2023): 1769. http://dx.doi.org/10.3390/foods12091769.

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In this study, we investigated the effects of germination on the secondary metabolite composition in spelt grains. Germination significantly increased the content of various metabolites in free and bound forms. Benzoxazinoids were the most important compounds in the free fraction of the 96 h germinated grains (MBOA content as the predominant compound was 277.61 ± 15.29 µg/g DW). The majority of phenolic acids were present in the bound fraction, with trans-ferulic acid as the main component, reaching 753.27 ± 95.87 µg/g DW. The often neglected cis-isomers of phenolic acids accounted for about 20% of the total phenolic acids. High levels of apigenin di-C-glycosides were found in spelt grains, and the schaftoside content was most affected by germination, increasing threefold. The accumulation of secondary metabolites significantly increased the antioxidant activity of germinated spelt. According to the results of this study, the content of most bioactive compounds was highest in spelt grains after 96 h of germination. These data suggest that germinated spelt could potentially be valuable for the production of functional foods.
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Kasai, Midori. "The Visualization and Quantification of Water Distribution in Rice Grains during Cooking". Nippon Shokuhin Kagaku Kogaku Kaishi 58, n. 10 (2011): 506–10. http://dx.doi.org/10.3136/nskkk.58.506.

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Wang, Yongsheng, Jie Li, Bo Wang, Yuting Zhang, Junling Geng, Li Xin Wen e Aike Li. "Effective Quantification of Tannin Content in Sorghum Grains Using Near-infrared Spectroscopy". International Journal of Animal Science and Technology 5, n. 1 (2021): 7. http://dx.doi.org/10.11648/j.ijast.20210501.12.

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Boubrit, Hassiba, e Bachir Melbouci. "Quantification of the crushing of grains by the calculation of the surfaces". European Journal of Environmental and Civil Engineering 24, n. 13 (24 ottobre 2018): 2284–305. http://dx.doi.org/10.1080/19648189.2018.1505661.

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Più fonti

Tesi sul tema "Quantification de la graisse"

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Josset, Anne. "Suivi par thermométrie par imagerie par résonance magnétique (IRM) des ablations thermiques dans les tissus mous". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAD040.

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Les ablations thermiques constituent des alternatives prometteuses aux techniques conventionnelles, notamment pour le traitement de cancers. Le caractère minimalement invasif de ces thérapies contribue à réduire la morbidité et les effets secondaires, transformant ainsi la prise en charge des patients. Toutefois, cela nécessite l’utilisation d’outils appropriés pour un suivi en temps réel des thérapies afin d’attester un traitement efficace et d’assurer la sécurité de la procédure. La thermométrie par Imagerie par Résonance Magnétique (IRM) est reconnue comme le gold standard pour monitorer ces thérapies. En effet, cette technique d’imagerie non invasive permet de cartographier de façon précise les changements de température au sein des tissus aqueux grâce à la méthode de la PRFS (Proton Resonance Frequency Shift). Cependant, l’efficacité de cette méthode, en particulier dans les tissus contenant de la graisse, nécessite une évaluation précise. Dans le cadre de ce travail de thèse, nous avons mis au point une méthode pour quantifier les pics restants de la graisse après différentes méthodes de suppression de la graisse. Cette approche a été caractérisée lors d’expériences in vitro et in vivo. La précision des mesures de thermométrie IRM PRFS a été ensuite mesurée pour plusieurs quantités de gras avec différentes méthodes de suppression. Les résultats montrent que le signal résiduel de la graisse impacte les mesures de température IRM PRFS. Une méthode a alors été proposée pour évaluer les variations de température sans suppression de la graisse à l’aide d’un algorithme de séparation de l’eau et de la graisse. L’approche proposée est compatible avec des séquences rapides, adaptées au temps réel, et permet de mesurer avec précision les variations de température dans les tissus contenant de la graisse
Thermal ablation offers a promising alternative to traditional cancer treatment techniques, particularly due to its minimally invasive feature, which reduces morbidity and side effects. However, it requires the use of appropriate tools for real-time temperature monitoring to attest the effectiveness of the treatment and ensure the safety of the procedure. Magnetic Resonance Imaging (MRI) thermometry is recognized as the gold standard for this purpose, allowing for precise temperature mapping in aqueous tissues using the PRFS (Proton Resonance Frequency Shift) method. Nevertheless, the effectiveness of this method in fat-containing tissues requires careful evaluation. In this thesis, we developed a method to quantify the remaining fat peak signal after various fat suppression methods. This approach was assessed through both in vitro and in vivo experiments. We then evaluated the accuracy of PRFS MRI thermometry with several amounts of fat and different fat suppression methods. Our findings indicate that the residual fat signal impacts PRFS MRI temperature measurements. Consequently, a method was suggested to evaluate temperature variations without fat suppression techniques, using a water/fat separation algorithm. This approach is compatible with real-time sequences and enables accurate measurement of temperature variation in fat-containing tissues
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Roullier, Vincent. "Classification floue et modélisation IRM : application à la quantification de la graisse pour une évaluation optimale des risques pathologiques associés à l'obésité". Phd thesis, Université d'Angers, 2008. http://tel.archives-ouvertes.fr/tel-00348028.

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Les travaux présentés dans cette thèse traitent de l'apport de l'incertitude, de l'imprécision et de l'a priori en traitement d'images médicales, dans le cadre d'outils d'aide au diagnostic des pathologies conséquentes de l'obésité et du surpoids. Deux parties composent ce travail : une modélisation du signal IRM d'une séquence prototype fournie par GE, et une méthode de classification floue adaptée pour répondre aux attentes des experts radiologistes et anatomopathologistes. Le signal IRM est issu des différents constituants du voxel. Afin de déterminer la proportion de graisse dans le tissu, les signaux issus de l'eau et de la graisse sont déterminées par régression à partir des images IRM obtenues en prenant en compte un a priori sur le bruit présent sur les images. Considéré de Gauss sur les images réelles et imaginaires, et de Rice sur les images amplitudes, cet a priori sur le bruit a permis de mettre en évidence l'apport de l'utilisation des données brutes lors de la quantification de la proportion de graisse et d'eau par rapport à une quantification uniquement effectuée sur les données amplitudes. La méthode de classification présentée ici permet une dépendance à longue distance lors du calcul des centroïdes. Cette méthode combinée à un algorithme de connectivité floue est adaptée à la mesure de la graisse viscérale et souscutanée. Elle fut également utilisée pour la quantification des vacuoles de triglycérides présentes sur des biopsies hépatiques. De part la proportion très hétérogène des vacuoles de stéatose, fonction du degré de la pathologie, nous avons amélioré l'algorithme de classification par une supervision permettant d'orienter la classification afin de se dédouaner de cette hétérogénéité. La classification est ensuite combinée à un système expert permettant d'éliminer les erreurs de classification survenues. L'ensemble des méthodes fut évalué dans le cadre d'expérimentations animales et de différents protocoles de recherche clinique.
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Daudé, Pierre. "Quantification du tissu adipeux épicardique à haut champ par IRM-Dixon, pour le phénotypage de la cardiomyopathie diabétique". Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0333.

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L’amélioration de la prise en charge des complications cardiaques dans les maladies métaboliques, obésité et diabète, est un enjeu majeur de notre société. La mesure du tissu adipeux épicardique (TAE), dépôt de graisse attaché au cœur, est un élément diagnostique émergent et prometteur pour identifier les patients à risque. Nous avons développé l’automatisation de cette mesure sur des images IRM de routine par apprentissage profond. Puis, une technique IRM innovante a été proposée pour mesurer et caractériser le TAE en 3D, réunissant : une acquisition en respiration libre, une reconstruction des images robuste au mouvement cardio-respiratoire et aux imperfections de l’IRM, un algorithme de caractérisation de la graisse optimisé et validé et la connaissance de la composition d’échantillons ex-vivo de TAE. L’ensemble permet la caractérisation in vivo et non-invasive du TAE, élément diagnostique novateur du risque cardio-métabolique
Improving the management of cardiac complications in metabolic diseases, obesity and diabetes, is a major challenge for our society. The measurement of epicardial adipose tissue (EAT), a fat depot attached to the heart, is an emerging and promising diagnosis to identify patients at risk. We developed the automation of this measurement on routine MRI images by deep learning. Then, an innovative MRI technique was proposed to measure and characterize the EAT in 3D, combining: a free-breathing acquisition, an image reconstruction robust to cardio-respiratory motion and MRI imperfections, an optimized and validated fat characterization algorithm and the knowledge of the composition of ex-vivo EAT samples. Together, this allows for in vivo, non-invasive characterization of EAT, a novel diagnosis for cardiometabolic risk
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Rahhal, Amer. "Identification and Quantification of Fibrosis and Adipose Tissue of the Atrial Myocardium using Cardiac Magnetic Resonance Imaging". Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS588.

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La fibrillation auriculaire est le plus souvent associée à une cardiomyopathie atriale composée de fibrose et d’infiltrats fibro-adipeux. L’identification de cette myopathie atrial en clinique est difficile, l’IRM qui permet l’imagerie tissulaire pourrait être un précieux outil diagnostic de la cardiomyopathie atriale. Méthodes: Etude de la déformation de la paroi libre de l’oreillette gauche (OG) par technique de « tracking IRM » (PLA) réalisée chez 13 patients, 24 heures avant une intervention de chirurgie valvulaire mitrale. 13 patients contrôles ont été inclus. Au cours de l’intervention, un échantillon de paroi libre de l’OG a été recueilli fixé dans le para formaldéhyde puis étudié à l’aide de technique d’histologie et par ex vitro par imagerie IRM. Résultats: La première étude a porté sur la corrélation entre les PLA et l’histologie auriculaire. Un PLA bas a été retrouvé chez les patients porteur d’un valvulopathie mitrale avec une OG remodelée par rapport à la population contrôle (P<0.001). Une corrélation significative a été observée entre la valeur du PLA et le dégrée d’infiltration fibro-adipeux du myocarde auriculaire (r=0.75, P=0.017). La deuxième étude a étudié la capacité de l’imagerie IRM d’analyser les différentes composantes histologiques du myocarde auriculaire. Nous avons établi les différentes séquences d’analyse d’image T2, Dixon qui permettent d’identifié: la fibrose, le myocarde et le tissu adipeux Conclusion : La déformation du myocarde auriculaire est liée au remodelage tissulaire et est un bon biomarqueur de la myopathie atriale. L’imagerie IRM est capable ex vivo d’identifier les différentes composantes histologiques du myocarde auriculaire
Introduction: Atrial fibrillation is associated with an atrial cardiomyopathy composed mainly of fibrosis and adipose tissue accumulation. However, its detection is difficult in clinical practice. Notably, there is controversy on the ability of MRI to quantify these components as well as the clinical significance of this parameter. Methods: LA strain (PLAS) was evaluated with MRI feature tracking in 13 patients 24 hours before mitral valve surgery and 13 healthy controls. Histologic correlation biopsies was available in 10 patients. Atrial samples were collected from patients who underwent cardiac surgery. Samples were fixed in formaldehyde and analyzed using 3D MRI acquisitions including T1 mapping and DIXON imaging. Samples were histologically analyzed in the same orientation used for MRI study. Results: We first studied the correlation between PLAS and atrial remodeling. PLAS was lower in patients with mitral regurgitation than in healthy subjects (P˂0.001). A strong association was found between PLAS and the degree of fibrofatty replacement evaluated by histologic analysis (r=-0.75, P=0.017). In a second study, we studied the ability of MRI to discriminate the various atrial components. High correlation was observed between T1 Mapping and histology for total r=0.93, interstitial r=0.93, and fatty fibrosis r=0.96. High correlation between DIXON and histology were found in fat r=0.98. Conclusion: PLAS correlates with the degree of fibrofatty infiltration which could be used as an imaging biomarker for the atrial cardiomyopathy. High field ex vivo MRI is able to identify the various components of the atrial myocardium; however, in vivo application remains a challenge
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Masson, François-Xavier. "Quantification 3D de la morphologie des grains d'or dans les sédiments meubles". Doctoral thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/67752.

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Guinet, Maé. "Quantification des flux d’azote induits par les cultures de légumineuses et étude de leurs déterminants : comparaison de 10 espèces de légumineuses à graines". Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCK011/document.

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Dans le contexte de la transition agroécologique en faveur de systèmes de culture plus économes en intrants azotés, la réintroduction des légumineuses a un rôle majeur à jouer pour atteindre la durabilité de ces systèmes. Peu de références sont actuellement disponibles sur les intérêts agronomiques et écologiques des différentes espèces, notamment à l’échelle de la rotation. Dans ce cadre, notre objectif principal consiste à mieux quantifier les flux d’azote impliqués au cours et après culture de légumineuses, et ce pour une gamme élargie d’espèces. Notre travail expérimental porte donc sur la caractérisation des flux d’azote induits dans le sol et dans les cultures de légumineuses aux caractéristiques morphologiques contrastées en parallèle de la mesure des déterminants de ces flux. Les objectifs spécifiques consistent à : i) quantifier la fixation symbiotique en fonction du niveau du stock d’azote minéral du sol, la minéralisation de l’azote des résidus de légumineuses après enfouissement et les pertes d’azote en dehors du système sol-plante (lixiviation, émission de protoxyde d’azote), ii) identifier les « traits de plantes » explicatifs des fonctions liées à ces flux d’azote. Pour atteindre ces objectifs, les différents flux d’azote ont été quantifiés au cours d’une expérimentation au champ avec implantation d’une culture de légumineuses en première année suivie par une culture de blé en année 2 qui a été menée en 2014-2015 et reconduite sur la campagne 2016-2017. En parallèle, les traits des plantes, notamment racinaires, ont été caractérisés plus finement au cours d’expérimentations conduites en conditions contrôlées
In the context of agroecological transition, the reintroduction of legume crops should play a key role in cropping system sustainability by allowing a reduction of nitrogen (N) inputs. But few references are available concerning the agronomical and ecological services provided by a wide range of legume crops, particularly within crops succession scale. Thus, the main objective of our study is to quantify the N fluxes during and after the legume crops taking into account 10 legume crops (peas, lupin, faba bean, soybean...). Our experiment consists in i) quantifying symbiotic N fixation depending on the amount of soil inorganic N, the mineralisation of N present in legume crop residues after soil incorporation and N losses outside of the soil-plant system (leaching, emission of nitrous oxide), ii) identifying plant biological traits associated to N fluxes. Thus, different N fluxes were quantified during a two-year field experiment, i.e. the first year (2014) legume crops were implanted and followed by wheat the second year (14-15) after incorportation of legume residues. This experiment was repeated in 2016-2017.In parallel, plant root traits were characterised during greenhouse hydroponic experiments
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Outal, Souhaïl. "Quantification par analyse d'images de la granulométrie des roches fragmentées : amélioration de l'extraction morphologique des surfaces, amélioration de la reconstruction stéréologique". Phd thesis, École Nationale Supérieure des Mines de Paris, 2006. http://pastel.archives-ouvertes.fr/pastel-00002394/en/.

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Cette recherche s'inscrit dans le cadre général du contrôle de qualité des processus utilisés en production minière, tels que le tir à l'explosif, le broyage et le concassage. Elle s'intéresse plus particulièrement à la quantification par traitement d'images de la granulométrie des roches fragmentées. Globalement, les développements menés portent sur l'amélioration des deux étapes les plus déterminantes de la mesure : l'extraction des contours des fragments de roches dans l'image (2D) et la reconstruction de la courbe granulométrique en volume (étape de stéréologie, 3D). Actuellement, le tamisage (ou plus généralement le criblage) est le moyen le plus utilisé pour la mesure de la granulométrie des roches fragmentées. Il constitue la référence actuelle de la mesure. En conséquence, toute mesure établie par traitement d'images sera validée sur la base des résultats du tamisage. En ce qui concerne l'étape d'extraction des contours des fragments, le problème majeur qui se pose est celui du filtrage correct du bruit présent dans l'image. Dans un premier temps, de nouveaux outils de filtrage, basés sur les transformations morphologiques résiduelles, assez puissants et adaptés au cas des images de fragments de roches sont introduits et évalués. Dans un second temps, les surfaces des fragments sont extraites grâce une segmentation de l'image, basée sur une ligne de partage des eaux contrôlée par les marqueurs extraits des filtrages. La robustesse et l'automatisation de la démarche sont validées sur plusieurs cas d'images de fragments de roches. Le second problème abordé dans cette recherche est celui de la reconstruction de la courbe granulométrique en volume à partir des surfaces extraites par traitement d'images. Afin d'éviter l'occurrence de nombreux biais liés à cette étape, nous proposons un découpage en deux sous-problèmes, et ce, en fonction de la disposition des matériaux analysés (tas abattu, camion, convoyeur à bande) : - dans le cas de faible recouvrement et chevauchement : un modèle expérimental de reconstruction volumique mettant en jeu les données des refus matériels (surface et volumes), et basé d'emblée sur les résultats de référence est développé. Les deux lois des tailles et des épaisseurs (lois de reconstruction) permettant d'attribuer une taille et un volume aux surfaces sont validées expérimentalement. - dans le cas complexe de présence de masquage entre fragments : nous commençons par émettre des hypothèses essentielles à l'adaptation de la théorie des modèles de structures aléatoires à notre cas de fragments de roches. L'analyse des limites d'une application directe du modèle aléatoire de feuilles mortes (hypothèse du schéma booléen) nous a amené à élaborer une nouvelle méthode d'acquisition basée sur une incidence à éclairement variable. S'inspirant de la technique du «shape-from-shading», elle permet d'obtenir une information supplémentaire sur le recouvrement (ombre portée entre fragments) pour l'application de la statistique des grains intacts. Enfin, les résultats obtenus dans cette recherche pour les fragments en vrac mais aussi pour d'autres types d'images d'éléments granulaires, nous ont permis d'envisager d'ores et déjà une valorisation aussi bien auprès de l'industrie minérale et aussi dans d'autres domaines tels que l'agroalimentaire, pharmaceutique, cimenteries,...
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Ben, Saada Mariem. "Étude du comportement visco-plastique du dioxyde d'uranium : quantification par analyse EBSD et ECCI des effets liés aux conditions de sollicitation et à la microstructure initiale". Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0270/document.

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Le dioxyde d’uranium (UO2) est utilisé en tant que combustible, sous forme de pastilles élaborées par métallurgie des poudres, dans les réacteurs nucléaires à eau pressurisée. Lors de transitoires de puissance, le centre des pastilles est le siège de mécanismes de déformation visco-plastique qui peuvent être partiellement reproduits, hors irradiation, par des essais de compression uniaxiale à haute température (typiquement 1500°C). Les conditions de sollicitation et la microstructure initiale des pastilles d’UO2 ont une influence sur leur comportement mécanique macroscopique. A l’échelle des grains, des mécanismes de sous-structuration interviennent mais, à ce jour, la sous-structure n’est pas quantifiée et le rôle des pores sur ces mécanismes n’est pas connu. Afin d’apporter des réponses sur ces points, deux lots de pastilles (L1 et L2) de taille de grains similaires, de même fraction volumique de pores, mais ceux-ci étant distribués différemment (2,5 fois plus de pores intra-granulaires dans L1 que dans L2), ont été fabriqués. Ils ont ensuite été soumis à des essais mécaniques dans différentes conditions. Le résultat montre que le lot L2 présente une vitesse de fluage plus élevée que le lot L1. Les techniques Electron BackScatter Diffraction (EBSD) et Electron Channeling Contrast Imaging (ECCI) ont été mises en œuvre et optimisées pour suivre l’évolution de la microstructure après déformation. En EBSD, le développement d’une procédure adaptée aux matériaux poreux a permis de détecter des sous-joints de grains (S-JG) de très faible désorientation (jusqu’à 0,1°), de mener une étude statistique de l'évolution de la sous-structuration des grains et d'évaluer la densité de dislocations géométriquement nécessaires générées. Différents types d’arrangements de dislocations formant les S-JG ont été révélés et analysés par ECCI. Grâce à la complémentarité de l’EBSD et de l’ECCI, la répartition des pores dans les grains et la localisation des S-JG ont pu être mises en regard. Les résultats montrent que le nombre ainsi que la fraction linéaire des S-JG et leur désorientation augmente avec le taux et la vitesse de déformation. Aux forts taux de déformation, cela conduit à la formation de nouveaux grains par un mécanisme de restauration/recristallisation dynamique par rotation de sous-grains. Pour des conditions de sollicitation identiques, les échantillons du lot L1 présentent un nombre et une fraction linéaire de S-JG nettement supérieurs à ceux du lot L2. De plus, dans le lot L1, les S-JG se localisent essentiellement à proximité des joints de grains alors qu’ils sont répartis dans l’ensemble du grain pour le lot L2. Ces différences seraient liées à une réduction du libre parcours moyen des dislocations du fait de la présence des pores intra-granulaires
Uranium dioxide (UO2) is used as a fuel, in pressurized water nuclear reactors, in the form of pellets produced by powder metallurgy. During power transients, the center part of pellets undergoes visco-plastic deformation by creep mechanisms. These mechanisms can be partially reproduced, out of irradiation, by uniaxial compression tests at high temperature (typically 1500°C). Testing conditions and initial microstructure of the UO2 pellets influence their macroscopic mechanical behavior. At the grain scale, sub-structuring mechanisms are involved, but, up to now, the sub-structure is not quantified and the role of pores on these mechanisms is unknown. In order to provide answers to these points, two batches of pellets (L1 and L2), characterized by a similar grain size, a same volume fraction of pores, but different pores distribution (2.5 times more intra-granular pores in L1 than in L2), were elaborated. They were submitted to mechanical tests under different conditions. The result shows that L1 has as a lower creep rate than L2. Electron Backscatter Diffraction (EBSD) and Electron Channeling Contrast Imaging (ECCI) techniques were used and optimized for porous materials to analyze the evolution of the microstructure after deformation. An original EBSD methodology was implemented to detect Sub-Grain Boundaries (S-GB) with very low disorientation angles (down to 0.1°), study statistically the grain fragmentation into sub-grains and evaluate the average density of the geometrically necessary dislocations. Thanks to ECCI, the arrangement of dislocations in some S-GB was evidenced and analyzed. EBSD and ECCI complementarity allowed relating the distribution of pores within the grains and the S-GB location. The results obtained on the two batches show that the number and the linear fraction of S-GB increases with the deformation level and rate. At high deformation rates, new grains appear by a mechanism of dynamic recovery/recrystallization by rotation of sub-grains. For identical loading conditions and strain rates, the samples of batch L1 have a number and a linear fraction of S-GB that are significantly higher than those of batch L2. Furthermore, in batch L1, S-GB are located essentially in the vicinity of the grain boundaries while they are distributed throughout the grain for batch L2. These microstructural differences seem to be related to a dislocation's mean free path reduction due to the presence of intra-granular pores
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Brun, Thomas. "Développement de méthode dosimétrique et de quantification du volume cible par IRM multiparamétrique pour le traitement ultra-focal du cancer de la prostate en curiethérapie de grains liés d'iode-125 personnalisés". Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSES071.

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Le traitement conventionnel du cancer localisé de la prostate, le plus fréquent chez l'homme, repose sur des approches de traitement de la glande entière et entraîne un risque important d'effets indésirables en termes de continence et de sexualité. A l'heure actuelle, les différentes stratégies de traitements peuvent être une chirurgie, une radiothérapie externe ou une curiethérapie interstitielle. Cependant, des échantillons chirurgicaux ont montré que chez une proportion significative de patients, le risque de progression du cancer était lié à un seul foyer de cancer indifférencié. De ce fait, le traitement de la lésion index primitive permettrait à la fois de lutter contre le cancer et de préserver la qualité de vie des patients. Bien que les développements récents des technologies d'imagerie et de biopsie puissent décrire l'étendue du cancer, le défi de focaliser avec précision le traitement sur la cible unique reste une tâche ardue, et les traitements focaux proposés entre la surveillance active du cancer de la prostate à faible risque et le traitement définitif des formes agressives sont encore des options en cours d'évaluation. En effet, les traitements focaux soulèvent donc des questions encore imparfaitement résolues pour un montage clinique optimal : Comment définir précisément le volume cible? Comment focaliser l'agent thérapeutique sur cette cible? Et enfin, comment surveiller le reste de la glande après le traitement ? Ce projet de thèse a pour but de développer et d'évaluer la faisabilité dosimétrique d'un traitement expérimental ultra-focal d'un cancer de la prostate par une technique de curiethérapie de grains liés d'iode 125 (I-125) et de développer une méthode de quantification dans la définition précise du foyer primitif tumoral à l'aide d'imagerie IRM multiparamétrique (IRMmp). Pour cela, le nombre et l'activité des grains d'I-125 utilisées pour la curiethérapie conventionnelle de la prostate sont définis sur la base du volume de la glande entière (environ 2 grains/cc). Par définition, la curiethérapie ultra-focale s'adresse à des cibles de formes complexes et de plus petits volumes, ce qui nous a poussé à développer une méthode dosimétrique d'implantation de multiples grains de faible activité. Deuxièmement, l'objectif de précision dans la délivrance des grains nous a conduit à mettre en œuvre l'utilisation séquentielle de trois systèmes d'imagerie distincts: l'IRMmp pour informer sur la position et le volume de la cible, l'échographie transrectale 3D (TRUS) pour délivrer un marqueur fiduciaire dans la cible tirant parti de la fusion non rigide avec l'IRMmp et une sonde échographique 2D biplanaire requis pour la planification du traitement et la pose des grains. Enfin, l'évaluation de la qualité du traitement - c'est-à-dire de la dose délivrée à la cible unique, par opposition à la glande entière en curiethérapie conventionnelle - a été rendu possible grâce au développement d'une méthode de quantification basée sur la définition précise de la position du volume cible tumoral à traiter à partir des données des imageries IRMmp et en comparaison par rapport aux données dosimétriques obtenues pour chaque patient de l'étude
The conventional treatment of localized prostate cancer, the most common cancer in men, is based on whole-gland treatment approaches and drives a significant risk of adverse effects in terms of continence and sexuality. Currently, various treatment strategies include surgery, external beam radiotherapy, or brachytherapy. However, surgical specimens have shown that in a significant proportion of patients, the risk of cancer progression is associated with a single focus of undifferentiated cancer. Therefore, treating the primary index lesion would achieve both cancer control and preservation of quality of life. Although recent developments in imaging and biopsy technologies can outline the extent of the cancer, the challenge of focusing the required precision with the treatment agent remains a daunting task, and focal treatments proposed between active surveillance of low-risk Prostate Cancer and definitive treatment of aggressive forms are still options under assessment Indeed, focal treatments raise questions that are still imperfectly resolved for an optimal clinical implementation: How to precisely define the target volume? How to focus the therapeutic agent on this target? And finally, how to monitor the rest of the gland after treatment? The aim of this thesis project is to develop and evaluate the dosimetric feasibility of an experimental ultra-focal treatment for prostate cancer using iodine-125 seeds brachytherapy and to develop a quantification method for the precise definition of the primary tumor focus using multiparametric MRI (mpMRI) imaging. To achieve this, the number and activity of I-125 seeds used for conventional prostate brachytherapy are defined based on the volume of the entire gland (approximately 2 seeds/cc). By definition, ultra-focal brachytherapy targets complex-shaped and smaller volumes, prompting us to develop a dosimetric method for implanting multiple seeds with low activity. Secondly, the precision objective in seed delivery led us to implement the sequential use of three distinct imaging systems: mpMRI to inform on the position and volume of the target, 3D transrectal ultrasound to deliver a fiducial marker into the target leveraging non-rigid fusion with mpMRI, and a 2D biplanar ultrasound probe required for treatment planning and seed placement. Finally, the evaluation of treatment quality - that is, the dose delivered to the single target as opposed to the entire gland in conventional brachytherapy - was made possible by developing a quantification method based on the precise definition of the position of the target tumor volume to be treated from mpMRI data and compared to dosimetric data obtained for each patient in the study
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Beaujeux, Rémy. "Spécificité, fonction et imagerie de la graisse épidurale lombaire postérieure". Université Louis Pasteur (Strasbourg) (1971-2008), 1994. http://www.theses.fr/1994STR11419.

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Libri sul tema "Quantification de la graisse"

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Condamin, Laurent. Risk Quantification. New York: John Wiley & Sons, Ltd., 2007.

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Ferré, François, a cura di. Gene Quantification. Boston, MA: Birkhäuser Boston, 1998. http://dx.doi.org/10.1007/978-1-4612-4164-5.

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Soize, Christian. Uncertainty Quantification. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54339-0.

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Condamin, Laurent, Jean-Paul Louisot e Patrick Naïm, a cura di. Risk Quantification. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781119209331.

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François, Ferré, a cura di. Gene quantification. Boston: Birkhäuser, 1997.

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France, Société mathématique de, a cura di. Quantification relativiste. Montrouge: Société Mathématique de France, 1991.

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Lefebvre, Jean-Pierre. La mauvaise graisse: Essai de pathologie bureaucratique. Luneray: Bertout, 1999.

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Nishisato, Shizuhiko, Eric J. Beh, Rosaria Lombardo e Jose G. Clavel. Modern Quantification Theory. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2470-4.

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Hamm, Fritz, e Erhard Hinrichs, a cura di. Plurality and Quantification. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-2706-8.

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Melaragno, Michele. Quantification in Science. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-6524-2.

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Capitoli di libri sul tema "Quantification de la graisse"

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Haschke, Michael. "Quantification". In Laboratory Micro-X-Ray Fluorescence Spectroscopy, 157–99. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04864-2_4.

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Jones, Charles. "Quantification". In Studies in Linguistics and Philosophy, 172–200. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3478-1_5.

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Gries, David, e Fred B. Schneider. "Quantification". In A Logical Approach to Discrete Math, 139–56. New York, NY: Springer New York, 1993. http://dx.doi.org/10.1007/978-1-4757-3837-7_9.

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Gutiérrez-Rexach, Javier. "Quantification". In The Handbook of Hispanic Linguistics, 307–32. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118228098.ch16.

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Peregrin, Jaroslav. "Quantification". In Doing Worlds with Words, 76–105. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8468-5_5.

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Wilde, Douglass J. "Quantification". In Jung’s Personality Theory Quantified, 17–21. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-100-4_3.

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Dutilh Novaes, Catarina, Cecilia Martini Bonadeo e Cecilia Martini Bonadeo. "Quantification". In Encyclopedia of Medieval Philosophy, 1093–96. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-1-4020-9729-4_425.

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Novaes, Catarina Dutilh. "Quantification". In Encyclopedia of Medieval Philosophy, 1625–29. Dordrecht: Springer Netherlands, 2020. http://dx.doi.org/10.1007/978-94-024-1665-7_425.

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Çalışkan, Ahmet Selami. "Quantification". In Homo Faber and Homo Economicus in the Scientific Revolution, 36–78. New York: Routledge, 2022. http://dx.doi.org/10.4324/9781003275756-4.

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Iacona, Andrea. "Quantification". In LOGIC: Lecture Notes for Philosophy, Mathematics, and Computer Science, 99–108. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64811-4_11.

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Atti di convegni sul tema "Quantification de la graisse"

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Picka, Jeffrey D. "Uncertainty quantification and granular thermodynamics". In POWDERS AND GRAINS 2013: Proceedings of the 7th International Conference on Micromechanics of Granular Media. AIP, 2013. http://dx.doi.org/10.1063/1.4811897.

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J. Paliwal, N.S. Visen, D.S. Jayas e N.D.G. White. "Quantification of Variations in Machine-Vision-Computed Morphological Features of Cereal Grains". In 2002 Chicago, IL July 28-31, 2002. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2002. http://dx.doi.org/10.13031/2013.10462.

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Buono, Antonio, Shawn Fullmer, Kelly Luck, Keith Peterson, Hubert king, PJ More e Stephanie LeBlanc. "Quantitative Digital Petrography: Full Thin Section Quantification of Pore Space and Grains". In SPE Middle East Oil and Gas Show and Conference. Society of Petroleum Engineers, 2019. http://dx.doi.org/10.2118/194899-ms.

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Portugal, D., J. P. Souza, M. Kuroda, A. Vidal, A. De Mello, M. Resende e Y. M. Silva. "Quantification of Mineral Grains and Pores in Thin Sections Using Mathematical Morphology". In 85th EAGE Annual Conference & Exhibition - Workshop Programme. European Association of Geoscientists & Engineers, 2024. http://dx.doi.org/10.3997/2214-4609.2024101299.

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Yusa, M., e E. T. Bowman. "Quantification of time-dependent microstructural change of a silty sand under load". In POWDERS AND GRAINS 2013: Proceedings of the 7th International Conference on Micromechanics of Granular Media. AIP, 2013. http://dx.doi.org/10.1063/1.4811925.

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Kemper, Björn, Alexander Höink, Daniel Carl e Gert von Bally. "Algorithm for fringe independent quantification of noise in wrapped phase distributions obtained by digital holography and speckle interferometry". In Speckle06: Speckles, From Grains to Flowers, a cura di Pierre Slangen e Christine Cerruti. SPIE, 2006. http://dx.doi.org/10.1117/12.695489.

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Gavrilenko, Maxim, Valentina Batanova, Xavier Llovet, Alina Koshlyakova, Alexander Sobolev, Daria Gavrilenko e Stepan Krasheninnikov. "Secondary fluorescence effect quantification of EPMA analyses of olivine grains embedded in basaltic glass". In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.10155.

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Siefert, John A., Jonathan D. Parker, Ryan MacLachlan, Sabrina Yan e Rachel Thomson. "Assessment and Quantification of Damage in the Grade 91 Steel Partially Transformed Zone". In AM-EPRI 2019, a cura di J. Shingledecker e M. Takeyama. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.am-epri-2019p0022.

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Abstract Damage in the grade 91 steel partially transformed zone of weld heat affected zones has historically been associated with many different types of microstructural features. Features described as being responsible for the nucleation of creep damage include particles such as laves phase, coarse M23C6, inclusions, nitrides, or interactions between creep strong and creep week grains, grain boundaries and potentially other sources. Few studies have attempted to link the observations of damage on scales of increasing detail from macro, to micro, to nano. Similarly, assessments are not made on a statistically relevant basis using 2D or 3D microscopy techniques. In the present paper, 2D assessment using scanning electron microscopy (SEM) and quantification techniques such as energy dispersive X-ray spectroscopy (EDS) and electron backscatter diffraction (EBSD) are utilized in combination with 3D serial sectioning of large volumes using plasma focused ion beam milling (P-FIB) and simultaneous EDS to evaluate an interrupted cross-weld creep test. Moreover, the sample selected for examination was from a feature cross-weld creep test made using a parent material susceptible to the evolution of creep damage. The test conditions were selected to give creep brittle behaviour and the sample was from a test interrupted at an estimated life fraction of 60%. The findings from these evaluations provide perspective on the features in the microstructure responsible for the nucleation and subsequent growth of the observed damage.
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Wu, Zhidi, Eric Edelman, Phil Smith, Sean Smith, Trevor Irons e Brian McPherson. "Uncertainty Quantification of Young's Modulus on Core Scale: A Bayesian Analysis on a Comprehensive Geomechanical Model". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0367.

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ABSTRACT The ability to accurately measure the static Young's modulus is crucial for understanding subsurface storage reservoirs. However, obtaining this data can be difficult and costly. Much previous research focused on the impact of one or two factors on geomechanical properties at a single scale, but a more comprehensive understanding is needed. This study examines the impact of six rock properties - porosity, clay content, permeability, sample size, and the framework grain content to cement content (FGC/CC) ratio on Young's modulus in samples from five rock facies. The goal is to systematically quantify the effects of these secondary rock properties on a primary geomechanical property in a range of sandstones at the core scale. This study suggests that the pore abundance and the relative amount of framework grains and cements play competing roles in rock's elastic behavior. In addition, the surrogate model yields the minimum uncertainty and reflects nonlinear trends between Young's modulus and secondary rock properties. Overall, we represented a data-driven approach to quantify the uncertainty of Young's modulus of rocks using cost-effective experimental measurements. INTRODUCTION Understanding and minimizing uncertainties in geomechanical properties can lead to successful geological investigations and complex engineering projects and prevent accidents such as reservoir leakage and wellbore collapse. Elastic modulus is a primary property (among mechanical properties), but data are often unavailable and can be costly to measure. Alternative to direct measurements, estimating elastic modulus is more effective if the roles of secondary properties, such as geological, hydrological, and petrophysical properties, can be quantified. Previous studies often evaluate the correlation between primary and secondary properties to predict primary geomechanical properties (Han et al., 1986; Chang et al., 2006). However, the correlations between primary and secondary properties are not comprehensive, and the uncertainty associated with predictive primary geomechanical properties is generally unknown. Therefore, a framework for the Bayesian assessment of a comprehensive geomechanical model with constrained uncertainty has been developed to address this challenge. The comprehensive geomechanical model is capable of predicting elastic modulus based on main secondary properties.
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Andaru, Arkanu, e Sarah Sausan. "Intelligent Detection of SEM Mineralogy Using Dynamic Segmentation Algorithm in Geothermal Sedimentary Reservoir: Case Study with Quantification of Quartz Overgrowth". In SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/215327-ms.

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Abstract Quantifying quartz overgrowth in sedimentary geothermal reservoirs can provide vital information about reservoir quality and drilling success rates. The traditional process, which involves manual inspection of numerous Scanning Electron Microscope (SEM) images, is tedious and time-consuming. This paper introduces an automated approach using computer vision and random forest algorithms to streamline the process, providing a more efficient method for noise reduction, multi-level thresholding, machine learning (ML) model training, and application to SEM images for quartz overgrowth detection. Our approach employs a dynamic segmentation algorithm that integrates noise suppression, multi-level auto-thresholding, and dynamic overlaying. This enables automatic mineral identification from lower-quality images, accommodating varying brightness and contrast levels. Additionally, the algorithm effectively handles overlay shifting in cathodoluminescence (CL) and backscattered electron (BSE) images. We use a Random Forest technique to train the algorithm using comprehensive ground truth data and CL image features like Gabor, Canny Edge, and Roberts Edge. The resultant ML model helps refine the image segmentation predictions, acting as a more precise mineralogy predictor. Our model training achieved an encouraging 75% accuracy score, demonstrating its effectiveness in distinguishing between quartz grains and overgrowth, as well as identifying porosity and other minerals. However, due to the vast data size, further model improvement necessitates additional training data and usage of a High Performance Computing (HPC) cluster. After training, the model showed enhanced detection capabilities, particularly a reduction in false porosity detections associated with internal cracks. Future improvements could involve applying morphology detection principles and allowing user input for parameters like overlay shifting. The program was designed for easy use by individuals with minimal coding experience, and further development into a web app is suggested for increased accessibility. In summary, this method significantly enhances the efficiency and accuracy of mineralogy analysis using SEM images, providing a quick and accurate method for geoscientists to determine mineral composition.
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Rapporti di organizzazioni sul tema "Quantification de la graisse"

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Konolige, Kurt. Quantification in Autoepistemic Logic. Fort Belvoir, VA: Defense Technical Information Center, settembre 1991. http://dx.doi.org/10.21236/ada461025.

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2

de Caritat, Patrice, Brent McInnes e Stephen Rowins. Towards a heavy mineral map of the Australian continent: a feasibility study. Geoscience Australia, 2020. http://dx.doi.org/10.11636/record.2020.031.

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Abstract (sommario):
Heavy minerals (HMs) are minerals with a specific gravity greater than 2.9 g/cm3. They are commonly highly resistant to physical and chemical weathering, and therefore persist in sediments as lasting indicators of the (former) presence of the rocks they formed in. The presence/absence of certain HMs, their associations with other HMs, their concentration levels, and the geochemical patterns they form in maps or 3D models can be indicative of geological processes that contributed to their formation. Furthermore trace element and isotopic analyses of HMs have been used to vector to mineralisation or constrain timing of geological processes. The positive role of HMs in mineral exploration is well established in other countries, but comparatively little understood in Australia. Here we present the results of a pilot project that was designed to establish, test and assess a workflow to produce a HM map (or atlas of maps) and dataset for Australia. This would represent a critical step in the ability to detect anomalous HM patterns as it would establish the background HM characteristics (i.e., unrelated to mineralisation). Further the extremely rich dataset produced would be a valuable input into any future machine learning/big data-based prospectivity analysis. The pilot project consisted in selecting ten sites from the National Geochemical Survey of Australia (NGSA) and separating and analysing the HM contents from the 75-430 µm grain-size fraction of the top (0-10 cm depth) sediment samples. A workflow was established and tested based on the density separation of the HM-rich phase by combining a shake table and the use of dense liquids. The automated mineralogy quantification was performed on a TESCAN® Integrated Mineral Analyser (TIMA) that identified and mapped thousands of grains in a matter of minutes for each sample. The results indicated that: (1) the NGSA samples are appropriate for HM analysis; (2) over 40 HMs were effectively identified and quantified using TIMA automated quantitative mineralogy; (3) the resultant HMs’ mineralogy is consistent with the samples’ bulk geochemistry and regional geological setting; and (4) the HM makeup of the NGSA samples varied across the country, as shown by the mineral mounts and preliminary maps. Based on these observations, HM mapping of the continent using NGSA samples will likely result in coherent and interpretable geological patterns relating to bedrock lithology, metamorphic grade, degree of alteration and mineralisation. It could assist in geological investigations especially where outcrop is minimal, challenging to correctly attribute due to extensive weathering, or simply difficult to access. It is believed that a continental-scale HM atlas for Australia could assist in derisking mineral exploration and lead to investment, e.g., via tenement uptake, exploration, discovery and ultimately exploitation. As some HMs are hosts for technology critical elements such as rare earth elements, their systematic and internally consistent quantification and mapping could lead to resource discovery essential for a more sustainable, lower-carbon economy.
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3

Belliveau, A., R. Tunuguntla e A. Noy. Carbon nanotube sizing and quantification. Office of Scientific and Technical Information (OSTI), maggio 2014. http://dx.doi.org/10.2172/1132015.

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4

Urban, Nathan Mark. Climate Uncertainty Quantification at LANL. Office of Scientific and Technical Information (OSTI), aprile 2016. http://dx.doi.org/10.2172/1250690.

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5

Gaines, William L., Richy J. Harrod e John F. Lehmkuhl. Monitoring biodiversity: quantification and interpretation. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1999. http://dx.doi.org/10.2737/pnw-gtr-443.

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6

Marina, Oana. Microwave digestion and quantification procedure. Office of Scientific and Technical Information (OSTI), settembre 2020. http://dx.doi.org/10.2172/1669075.

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7

Thiagarajan, J. Uncertainty Quantification in Scientific ML. Office of Scientific and Technical Information (OSTI), settembre 2020. http://dx.doi.org/10.2172/1670557.

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8

Stracuzzi, David, Maximillian Chen, Michael Darling, Matthew Peterson e Charlie Vollmer. Uncertainty Quantification for Machine Learning. Office of Scientific and Technical Information (OSTI), giugno 2017. http://dx.doi.org/10.2172/1733262.

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9

Karpius, Peter. Nuclide Identification, Quantification, and Uncertainty. Office of Scientific and Technical Information (OSTI), maggio 2021. http://dx.doi.org/10.2172/1782632.

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10

Seifried, Jeffrey E. Adjoint-Based Uncertainty Quantification with MCNP. Office of Scientific and Technical Information (OSTI), settembre 2011. http://dx.doi.org/10.2172/1110395.

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