Dissertations / Theses on the topic 'Deep peat'
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Zakaria, Salmah. "Water management in deep peat soils in Malaysia." Thesis, Cranfield University, 1992. http://dspace.lib.cranfield.ac.uk/handle/1826/7744.
Full textBennett, Michael Dever. "Effect of Concentration of Sphagnum Peat Moss on Strength of Binder-Treated Soil." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/93210.
Full textMaster of Science
Organic soils are formed continuously as matter from deceased organisms – mainly plants – is deposited in wet environs and decomposes. Organic soils are most commonly found in swamps, marshes, and coastal areas. These soils make poor foundation materials due to their low strengths. Deep mixing, or soil mixing, involves introducing a binder like Portland cement or lime into soil and blending the soil and binder together to form columns or blocks. Upon mixing, cementitious reactions occur, and the soil-binder mixture gains strength as it cures. Deep mixing may be performed using either a dry binder, known as dry mixing, or a binder-water slurry, referred to as wet mixing. Deep mixing may be used to treat either inorganic or organic soils to depths of 30 meters or greater. Contractor experience has shown that deep mixing is one of the most effective methods of improving the strength of organic soils. Lab-scale studies (by previous researchers) of wet mixing of inorganic soils have found that the strength of soil-binder mixtures can be expressed as a function of mixture curing time and curing temperature, as well as the quantity of binder used, or binder factor, and the consistency of the binder slurry. No corresponding expression has been generated for wet mixing of organic soils, although many studies on the subject have been performed by previous researchers. The goal of this research was to generate such an expression for one organic soil. The soil used was made of sphagnum peat moss, an organic material commonly found in nature, and an inorganic clay used by previous researchers in studies of deep mixing in inorganic soils. The binder used in this research was a Portland cement. For this research, 43 unique soil-binder mixtures were manufactured. Each mixture involved a unique combination of soil organic matter content, binder factor, and binder slurry consistency. After a soil-binder mixture was made, it was divided, placed into cylindrical molds, and allowed to cure. The temperature of the curing environment of the mixture was monitored. Mixture compressive strength was assessed after 7, 14, and 28 days of curing using two cylindrically molded specimens of the mixture. Data on mixture strength was then evaluated to assess whether it could be expressed as a function of the variables tested. iv This research determined that the strength of at least some organic soils improved with wet mixing can be expressed as a function of soil organic matter content, binder factor, binder slurry consistency, and mixture curing time and curing temperature. The function will likely prove useful to deep mixing contractors, who routinely perform lab-scale deep mixing trials on samples of the soils to be improved in the field. Assuming wet mixing is used, the results of the trials are used to select values of binder factor and binder slurry consistency for the project. The function generated from this research will allow deep mixing contractors to select these values more reliably during the lab-scale phase of their work.
Kakei, Mahdi. "Effects of lime application on fine-root development of Sitka spruce (Picea sitchesis (Bougard) carrie) trees grown on deep peat soils." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295396.
Full textJob, Nancy Merle. "Geomorphic origin and dynamics of deep, peat-filled, valley bottom wetlands dominated by palmiet (Prionium serratum) : a case study based on the Goukou Wetland, Western Cape." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013122.
Full textCunningham, Dustin T. "Fusion of Multimodal Neuroimaging for Deep Brain Stimulation Studies." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337895443.
Full textXu, Lina [Verfasser]. "Analyzing Tumor Lesions in PET/CT Images Using Deep Learning Methods and Physiological Models / Lina Xu." München : Verlag Dr. Hut, 2019. http://d-nb.info/1181514266/34.
Full textPllashniku, Edlir, and Zolal Stanikzai. "Normalization of Deep and Shallow CNNs tasked with Medical 3D PET-scans : Analysis of technique applicability." Thesis, Högskolan i Halmstad, Akademin för informationsteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-45521.
Full textBaydoun, Atallah. "FDG-PET/MR for Cervical Cancer Staging and Radiation Therapy Planning: A Novel, Deep Learning-based Approach." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1594844980840027.
Full textMercer, John A. (John Andrew). "Reliability of a Graded Exercise Test During Deep Water Running and Comparison of Peak Metabolic Responses to Treadmill Running." Thesis, University of North Texas, 1994. https://digital.library.unt.edu/ark:/67531/metadc501238/.
Full textVan, der Bijl Johannes. "Sustainable DSM on deep mine refrigeration systems : a novel approach / J. van der Bijl." Thesis, North-West University, 2007. http://hdl.handle.net/10394/1940.
Full textCantryll-Stewart, Ricki. "A discernment of prey selection by the ancient Maya : white-tailed deer (Odocoileus virginianus) : pest, prey, or domesticate." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/50198/.
Full textRoche, Basile. "Caractérisation quantitative de la variation métabolique cérébrale : application à la comparaison de PET-SCANS." Thesis, Clermont-Ferrand 1, 2016. http://www.theses.fr/2016CLF1MM25/document.
Full textPositron Emission Tomography is a nuclear medicine imaging method, allowing measure of an organe metabolic activity through degradation of an injected radio-tracer. This methode can be used, with the appropriate radio-tracer, such as 18F-Fluorodeoxyglucose, for observation of cerebral metabolic activity. Through a clinical study, brain damaged patients with counciousness disorders had an implantation surgery of Deep Brain Stimulation (DBS) electrodes. To be able to do the follow up of the patient before and after the DBS procedure, and because it's compatible with electrodes, PET imaging is used. We ask ourself the following question, how to characterize variations between two PET images, to precisely mesure the impact of a treatment ? By construction, PET imaging obtained values depend of numerous factors. If patient weight and injected radio-tracer are classicaly normalized, using the `Standard Uptake Value' (SUV) method, glycemia for exemple is not. For this reason, compute activity variations between two PET images is a delicate problem. We propose a specific function to allow computation of metabolic variation maps for two PET acquisitions, based on a voxel approach of the PET imaging ratio. We apply it to the study of stimulated patients (DBS) with counciousness disorders. More specifically, we are interested in intra-patient PET imaging comparison (before versus after DBS), but also in inter-patient comparison (patient versus reference). During the intra-patient maps creation process, PET patient images are rigidly registered with a T1 weighted structural Magnetic Resonance Imaging (MRI) acquisition. Due to major deformation caused by cerebral injuries, a precise brain mask is created by a clinical expert. During the inter-patient maps creation process, PET patient imaging are non-rigidly registered to a reference imaging, an Atlas we build. In this case, a semi automatic mask of the inside skull is computed. Results can be further improved by the supplementary application of a deformed manual mask. One of the method key elements, is to estimate a specific normalization for each imaging, making them comparable, in order to calculate quantitative charaterisation of cerebral metabolic variations. Cerebral metabolic variation maps obtained are then compared to observed clinical assesments and effects to judge their relevance
Roberts, Jordan. "Telluride mineralogy at the Deer Horn Au-Ag-Te-(Bi-Pb-W) deposit, Lindquist Peak, west-central British Columbia : implications for the generation of tellurides." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63390.
Full textScience, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
Martens, Corentin. "Patient-Derived Tumour Growth Modelling from Multi-Parametric Analysis of Combined Dynamic PET/MR Data." Doctoral thesis, Universite Libre de Bruxelles, 2021. https://dipot.ulb.ac.be/dspace/bitstream/2013/320127/5/contratCM.pdf.
Full textLes gliomes sont les tumeurs cérébrales primitives les plus communes et sont associés à un mauvais pronostic. Parmi ces derniers, les gliomes diffus – qui incluent la forme la plus agressive, le glioblastome (GBM) – sont connus pour être hautement infiltrants. Le diagnostic et le suivi des gliomes s'appuient sur la tomographie par émission de positons (TEP) ainsi que l'imagerie par résonance magnétique (IRM). Cependant, ces techniques d'imagerie ne permettent actuellement pas d'évaluer l'étendue totale de tumeurs aussi infiltrantes ni d'anticiper leurs schémas d'invasion préférentiels, conduisant à une planification sous-optimale du traitement. La modélisation mathématique de la croissance tumorale a été proposée pour répondre à ce problème. Les modèles de croissance tumorale de type réaction-diffusion, qui sont probablement les plus communément utilisés pour la modélisation de la croissance des gliomes diffus, proposent de capturer la prolifération et la migration des cellules tumorales au moyen d'une équation aux dérivées partielles. Bien que le potentiel de tels modèles ait été démontré dans de nombreux travaux pour le suivi des patients et la planification de thérapies, seules quelques applications cliniques restreintes semblent avoir émergé de ces derniers. Ce travail de thèse a pour but de revisiter les modèles de croissance tumorale de type réaction-diffusion en utilisant des technologies de pointe en imagerie médicale et traitement de données, avec pour objectif d'y intégrer des données TEP/IRM multi-paramétriques pour personnaliser davantage le modèle. Le problème de la segmentation des tissus cérébraux dans les images IRM est d'abord adressé, avec pour but de définir un domaine propre au patient pour la résolution du modèle. Une méthode proposée précédemment permettant de dériver un tenseur de diffusion tumoral à partir du tenseur de diffusion de l'eau évalué par imagerie DTI a ensuite été implémentée afin de guider la migration anisotrope des cellules tumorales le long des fibres de matière blanche. L'utilisation de l'imagerie TEP dynamique à la [S-méthyl-11C]méthionine ([11C]MET) est également investiguée pour la génération de cartes de potentiel prolifératif propre au patient afin de nourrir le modèle. Ces investigations ont mené au développement d'un modèle compartimental pour le transport des traceurs TEP dérivés des acides aminés dans les gliomes. Sur base des résultats du modèle compartimental, une nouvelle méthodologie est proposée utilisant l'analyse en composantes principales pour extraire des cartes paramétriques à partir de données TEP dynamiques à la [11C]MET. Le problème de l'estimation des conditions initiales du modèle à partir d'images IRM est ensuite adressé par le biais d'une étude translationelle combinant IRM et histologie menée sur un cas de GBM non-opéré. Différentes stratégies de résolution numérique basées sur les méthodes des différences et éléments finis sont finalement implémentées et comparées. Tous ces développements sont embarqués dans un framework commun permettant d'étudier in silico la croissance des gliomes et fournissant une base solide pour de futures recherches dans le domaine. Cependant, certaines hypothèses communément admises reliant les délimitations des anormalités visibles en IRM à des iso-contours de densité de cellules tumorales ont été invalidée par l'étude translationelle menée, laissant ouverte les questions de l'initialisation et de la validation du modèle. Par ailleurs, l'analyse de l'évolution temporelle de cas réels de gliomes multi-traités démontre les limitations du modèle. Ces dernières affirmations mettent en évidence les obstacles actuels à l'application clinique de tels modèles et ouvrent la voie à de nouvelles possibilités d'amélioration.
Doctorat en Sciences de l'ingénieur et technologie
info:eu-repo/semantics/nonPublished
Fourcade, Constance. "Suivi de l'évolution du cancer du sein métastasé via le recalage et la segmentation d'images TEP en utilisant des réseaux entraînés et non-entraînés." Thesis, Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0029.
Full textMetastatic breast cancer requires constant monitoring. During follow-up care, PET images are regularly acquired and interpreted according to specific guidelines, such as PERCIST, to decide whether or not the treatment should be adapted. However, PERCIST focuses only on one lesion representing tumor burden. The objective of this PhD thesis is to assist physicians monitormetastatic breast cancer patients with longitudinal PET images and improve tumor evaluation by providing them tools to consider all regions showing a high uptake. Our first contribution is a method for the automatic segmentation of active organs (brain, bladder, etc). Our second contribution formulates the segmentation of lesions in the followup examination as an image registration problem.The longitudinal full-body PET image registration problem is addressed, in this thesis, with our novel method called MIRRBA (Medical Image Registration Regularized By Architecture), which combines the strengths of both conventional and DL-based approaches within a Deep Image Prior (DIP) setup. We validated the three types of approaches (conventional, DL and MIRRBA) on a private longitudinalPET dataset obtained in the context of the EPICURE project. Finally, the third contribution is the evaluation of the biomarkers extracted from lesion segmentations obtained from the lesion registration step. We propose a new tool for the monitoring of metastatic breast cancer
Lehujeur, Maximilien. "Étude d'un réservoir géothermique profond par corrélation de bruit sismique ambiant." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAH013/document.
Full textThis work focuses on the application of the ambient seismic noise correlation technique for the imaging and monitoring of deep geothermal reservoirs near Rittershoffen (ECOGI) and Soultz-sous-Forêts (GEIE-EMC). The strong spatial and temporal variability of the noise sources in the period range 0.2-7s limits the reconstruction of the Green’s functions. This results in significant errors in the velocity models. Two approaches are proposed to overcome the spatial non-uniformity of the noise and to improve the quality of the velocity models. Besides that, the temporal variability of the noise sources is a limiting factor for monitoring purposes. We estimate that the speed variations should be larger than 0.1% to 1% to be detected by the available networks. This threshold was not reached at Rittershoffen during the drillings or the stimulations. However, a probable change of the diffracting properties of the medium was observed following a hydraulic stimulation
Wei, Wen. "Apprentissage automatique des altérations cérébrales causées par la sclérose en plaques en neuro-imagerie multimodale." Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4021.
Full textMultiple Sclerosis (MS) is the most common progressive neurological disease of young adults worldwide and thus represents a major public health issue with about 90,000 patients in France and more than 500,000 people affected with MS in Europe. In order to optimize treatments, it is essential to be able to measure and track brain alterations in MS patients. In fact, MS is a multi-faceted disease which involves different types of alterations, such as myelin damage and repair. Under this observation, multimodal neuroimaging are needed to fully characterize the disease. Magnetic resonance imaging (MRI) has emerged as a fundamental imaging biomarker for multiple sclerosis because of its high sensitivity to reveal macroscopic tissue abnormalities in patients with MS. Conventional MR scanning provides a direct way to detect MS lesions and their changes, and plays a dominant role in the diagnostic criteria of MS. Moreover, positron emission tomography (PET) imaging, an alternative imaging modality, can provide functional information and detect target tissue changes at the cellular and molecular level by using various radiotracers. For example, by using the radiotracer [11C]PIB, PET allows a direct pathological measure of myelin alteration. However, in clinical settings, not all the modalities are available because of various reasons. In this thesis, we therefore focus on learning and predicting missing-modality-derived brain alterations in MS from multimodal neuroimaging data
Jeng, Jya-wei, and 鄭家偉. "The technology of deep dyeing auxiliary on PET microfiber." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/47582949345279340018.
Full text國立中央大學
化學工程與材料工程研究所
96
The deep dyeing effect of the disperse dye on polyester microfiber in the presence of cationic auxiliaries synthesized by (3-acrylamidopropyl)trimethyl ammonium chloride (APTAC) and acrylonitrile (AN) as monomers and ammonium persulfate (APS) as the initiator has been developed. The different parameters, dyeing temperature, auxiliary components, auxiliary content, dyeing holding time, dyeing temperature rate and auxiliary’s molecular weight, were discussed. Colour shade depth ( K/S ), wash fastness test and SEM photographs of dyed microfiber were measured. The result showed that the K/S of the dyed microfiber was increased and maintain good wash fastness, with adding cationic auxiliaries (especially with low molecular weight) in the dye bath or decreasing dyeing temperature. The highest value of K/S, 550 (increase 25%), of dyed microfiber was obtained by adding auxiliary.
"Deep Learning based Classification of FDG-PET Data for Alzheimer's Disease." Master's thesis, 2017. http://hdl.handle.net/2286/R.I.44112.
Full textDissertation/Thesis
Masters Thesis Computer Science 2017
Ahmad, Tariq B. "Supply Current Modeling and Analysis of Deep Sub-Micron Cmos Circuits." 2008. https://scholarworks.umass.edu/theses/82.
Full textHong, Siang-Yu, and 洪香瑜. "The Relationship between Pet Companionship and Nine Principles of Deep Knowledge of Habitual Domains." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/78743455902464119597.
Full text國立中興大學
運動與健康管理研究所
100
Nowadays, the population of pet owners is increasing. Through pet companionship, the owners can receive relaxation and pleasure of mind. On the other side, the benefits of the companionship will increase physical activities and cultivate habit of taking exercise. The purpose of this study was to investigate the relationship between attachment of pet owners and attitudes of principles for deep knowledge. The two questionnaires were used as the research tool, including Lexington Attachment to Pet Scale (LAPS) (Johnson, Garrity, & Stallones, 1992) and Nine Principles for Deep Knowledge Scale (PDKS). PDKS had content validity and convergent validity. In this study, the content validity was measured by back translation method and Cronbach’s value (α =.921) was measured by internal consistency, and indicated that LAPS was a useful tool. There were 209 pet owners (Male=80, Female=129) who had taken pets to Veterinary Medical Teaching Hospital of National Chung Hsing University participated in this study. The statistical methods of descriptive statistics, Pearson’s Correlation ,t-test, one-way ANOVA, Simple Linear Regression and Logistic Regression of software SPSS 19.0 were used to exam the relationships between attachment to pet owners’ attitude toward the principles for deep knowledge in their daily lives. The result of this study showed that the degree of attachment to pets had a positive correlation with attitude of deep knowledge. Additionally, there were statistically significant differences between the gender and the two variables of attachment to pets and attitude of deep knowledge. Therefore, the owners(N=148,70.8%) used to carry their pets to exercise demonstrated higher levels in the two variables of attachment to pets and attitude toward the principles for deep knowledge. The finding of this study proved the concept that pet companionship can increase both of the mental and interpersonal supports. Hence, to be aware of the degree of attachment to pets will predict the attitude toward the principles for deep knowledge and to improve owners’ daily lives and habits.
Ситник, Олександр Георгійович, and O. S. Yurchenko. "INTERCONNECTION OF EFFECTS OF PEAK AND LATITUDINAL IMPULSIVE MODULATION IN THE PROCESS OF DEEP PRINT AND HIS INFLUENCE ON QUALITY OF MAKING OF DOCUMENT IN CALS-TECHNOLOGY." Thesis, 2008. http://er.nau.edu.ua/handle/NAU/11037.
Full text