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Dissertations / Theses on the topic 'GCMS analysis'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Kassahun, Kelem. "Negative ion chemical ionization GCMS analysis of valproic acid and its metabolites." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26423.

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Valproic acid (VPA) is a major anticonvulsant drug widely used in the treatment of absence seizures. VPA is extensively metabolized in humans. Several VPA metabolites possess anticonvulsant activity and other metabolites are implicated in rare but fatal cases of hepatotoxicity. A highly sensitive and more specific analytical method was required to analyze the large number of VPA metabolites, some of which are present at trace levels. The objective of this study was to develop such a method and to make a preliminary application of the method to the determination of trace VPA levels and to searc

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2

Vestner, Jochen. "New Chemometric Approaches to Non-targeted GCMS Fingerprinting Analysis of Wine Volatiles." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0141/document.

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Contrairement à l’analyse ciblée des composés volatils du vin par chromatographie en phase gazeuse couplée à la spectrométrie de masse (GC-MS), les approches par GC-MS non ciblées prennent en compte les composés connus et inconnus. Ces méthodes sont plus rapides et fournissent une représentation plus complète de la composition de l’échantillon. Bien que plusieurs approches non-ciblées aient été développées, il y a encore une forte demande d’outils automatisés pour le traitement des données, en particulier pour les données multidimensionnelles complexes telles que celles de multiples chromatogr

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3

Li, Pik Kei 1978. "High pressure and microwave assisted generation and pyrolysis-GCMS analysis of glycated proteins." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79033.

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The extent of denaturation and glycation of lysozyme and BSA with the application of high hydrostatic pressure (HHP) at 400 MPa at 30°C from 8 to 48 hours and focused microwave irradiation at 50°C under varying microwave power and from 10 to 60 minutes was investigated in the presence and absence of D-glucose. The HHP treatment caused 10 to 20% denaturation of lysozyme whereas microwave irradiation caused 20 to 40% denaturation, with more destruction to the lysozyme in the presence of glucose compared to the control. The extent of glycation was also higher with the high pressure samples

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4

Kassam, Jeanine Posset. "GCMS analysis of valproic acid metabolites and the effects of salicylate on valproic acid metabolism." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24692.

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An assay has been developed for the simultaneous quantitative analysis of VPA and twelve of its metabolites namely 2-ene VPA, 3-ene VPA, 4-ene VPA, (E)-2,4-diene VPA, (E,E)-2,3'-diene VPA, 3-OH VPA, 4-OH VPA, 5-OH VPA, 3-keto VPA, 4-keto VPA, 2-propylsuccinic acid and 2-propylglutaric acid. The assay is accomplished in a single run using the Hewlett-Packard 5987A GC-MS. VPA and its metabolites were measured using selected ion monitoring of the characteristic (M-57)⁺ ions of the tertbutyldimethylsilyl (tBDMS) derivatives. The 4-OH VPA was measured as the underivatized ϒ-lactone. [²H₆]-VPA, [²H₃

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5

Sit, Hoi Leung. "Applications of thermal desorption GCMS analysis of nonpolar organic compounds in source and ambient aerosols /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CHEM%202008%20SIT.

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6

Westberg, Emilie. "Qualitative and Quantitative Analysis of Biodiesel Deposits Formed on a Hot Metal Surface." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-95617.

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This thesis aims to investigate the formation of deposits from thermally degraded biodiesel on a hot metal surface under the influence of sodium or copper contaminations. Biodiesel or Fatty Acid Methyl Esters (FAMEs) is a widely utilized biofuel with the potential to replace fossil fuels, however, issues regarding the thermal and oxidative stability prevent the progress of biodiesel for utilization as vehicle fuel. The thermal degradation of biodiesel causes formation of deposits often occurring in the fuel injectors, which could result in reduced engine efficiency, increased emissions and eng

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7

Fazlic, Ida <1995&gt. "Study of oxidation of polyunsaturated fatty acids in drying oil through a multi-analytical approach (NMR, GCMS, FTIR and ESI-ToF analysis)." Master's Degree Thesis, Università Ca' Foscari Venezia, 2020. http://hdl.handle.net/10579/16721.

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L'obiettivo della tesi è fornire una nuova visione dello studio dell'ossidazione degli acidi grassi polinsaturi nell'olio essiccato. La raccolta di dati è stata acquisita per comprendere meglio il meccanismo di reticolazione negli oli essiccanti eseguendo reazioni di ossidazione su modelli semplificati. Gli acidi grassi polinsaturi considerati erano acido oleico, linoleico e linolenico. I singoli prodotti delle reazioni sono stati inizialmente analizzati mediante cromatografia TLC, in base al quale sono stati separati mediante flash cromatografia . Ogni frazione purificata è stata identificata

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8

Grigsby, Claude Curtis. "A Comprehensive Tool and Analytical Pathway for Differential Molecular Profiling and Biomarker Discovery." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1387540709.

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9

Borchmann, Daniel. "Axiomatizing Confident GCIs of Finite Interpretations." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-95245.

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Constructing description logic ontologies is a difficult task that is normally conducted by experts. Recent results show that parts of ontologies can be constructed from description logic interpretations. However, these results assume the interpretations to be free of errors, which may not be the case for real-world data. To provide some mechanism to handle these errors, the notion of confidence from data mining is introduced into description logics, yielding confident general concept inclusions (confident GCIs) of finite interpretations. The main focus of this work is to prove the existence o

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10

Lindström, Björn. "Analys av Nedbrytningsprodukter av Polymerer för Bitumenändamål." Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-9832.

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<p>This project was aimed to study the degradation of polystyrene-butadiene-styrene block copolymer (SBS). SBS is used to modify bitumen, the binder in asphalt. From earlier studies it is known that SBS degrades in bitumen, but the degradation products have not been identified. To be able to determine the long term effects of SBS in the environment, degradation products need to be identified. Polystyrene forms rigid blocks with polybutadiene as a rubbery matrix between the ridgid blocks. When blended in bitumen, the polystyrene blocks are crosslinked to form a three dimensional network. SBS is

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11

Gyllkvist, Sofi, and Katrin Marteliusson. "Motivation och Bostadsköp : Self Determination Theory ur ett konsumentperspektiv." Thesis, Högskolan i Gävle, Avdelningen för ekonomi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-8454.

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Studiens syfte: Vårt syfte är att med hjälp av en enkätundersökning och etablerade motivationsteorier ta reda på vad som motiverar konsumenter inför ett bostadsköp. Metod: Vi har använt oss av en kvantitativ metod och informationen har samlats in med hjälp av en elektronisk enkätundersökning för att sedan kopplas till Self Determination Theory (SDT). Resultat & slutsats: Resultatet analyserades med hjälp av statistikprogrammet SPSS. Faktoranalysen resulterade i 13 faktorer, vilket slutligen gav en bild av 6 olika typer av konsumenter som alla motiveras på olika sätt. Förslag till fortsatt

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12

Hood, Lon, Semjon Schimanke, Thomas Spangehl, Sourabh Bal, and Ulrich Cubasch. "The Surface Climate Response to 11-Yr Solar Forcing during Northern Winter: Observational Analyses and Comparisons with GCM Simulations." AMER METEOROLOGICAL SOC, 2013. http://hdl.handle.net/10150/623315.

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The surface climate response to 11-yr solar forcing during northern winter is first reestimated by applying a multiple linear regression (MLR) statistical model to Hadley Centre sea level pressure (SLP) and sea surface temperature (SST) data over the 1880–2009 period. In addition to a significant positive SLP response in the North Pacific found in previous studies, a positive SST response is obtained across the midlatitude North Pacific. Negative but insignificant SLP responses are obtained in the Arctic. The derived SLP response at zero lag therefore resembles a positive phase of the Arctic O

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13

Trollé, Xavier. "Développement d'un modèle de gestion des échanges de masse et d'énergie généralisable aux différents couverts dans les GCM : analyses et tests de nouveaux concepts." Paris 6, 2008. http://www.theses.fr/2008PA066676.

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L’objectif de cette thèse est de déterminer comment le modèle de continuum sol plante atmosphère, développé par l’INRA (Tuzet et 2003), très sensible au stress hydrique, peut être incorporé à un modèle de circulation générale (GCM) et s’il peut lui apporter une amélioration sensible. Un schéma de résolution numérique a été créé, adapté à la logique de résolution des GCM tout en conservant les interactions responsables de l’équilibre du continuum. Cette résolution améliore ses performances (temps de calcul, stabilité). Les résultats de ce modèle ont été comparés avec ceux de SECHIBA (le GCM du

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14

Came, Rosemarie Evangeline. "Abrupt climate change in the Atlantic Ocean during the last 20,000 years : insights from multi-element analysis of benthic and planktic foraminifera and coupled OA-GCM." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33945.

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Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2005.<br>Includes bibliographical references.<br>Minor and trace element records of planktic and benthic foraminifera from Atlantic sediment cores, as well as output from a coupled OAGCM, were used to investigate the magnitude and distribution of the oceanic response to abrupt climate events of the past 20 kyr. The study addressed three major questions: 1) What is the magn

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15

Wu, Ruo-Ying, and 吳若穎. "Taiwan's Rainfall Frequency Analysis in the End of 21st Century, Based on the GCMs of CGCM3(T47) and CNRM-CM3." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/88717191836972481752.

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碩士<br>國立臺灣海洋大學<br>河海工程學系<br>99<br>The purpose of this research is to assess the potential impact of climate change on hydrologic frequency of extreme events (drought and flood) in Taiwan. Provided by IPCC’S GCM A1B scenarios of climate model data in CGCM3(T47)and CNRM-CM3, The adjusted data by using the quadrant conversion method over Taiwan are analyzed based on the Log-Pearson type III distribution and kriging method to realize the maximum consecutive dry days and maximum 1-day, 2-day, and 3-day rainfall within 2080-2099, as compared with those within 1979-1998. For maximum 1-day to 3-day ra

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16

江昀. "Analysis of Drought and Flood in Taiwan in the End of 21st Century, Based on the GCMs of GFDL-cm2.0 and FGOALS-g1.0." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/27492287564633334763.

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碩士<br>國立臺灣海洋大學<br>河海工程學系<br>99<br>The purpose of this research is to assess the potential impact of climate change on the hydrologic frequency of extreme event in Taiwan. Based on downscaled GCM outputs under the A1B emissions scenario GFDL and LASG, frequency of the maximum consecutive dry days and maximum 1-day, 2-day, and 3-day rainfall within 2080-2099 are studied, as compared with those within 1979-1998. In general, in the end of 21st century, extreme event in Taiwan has the tendency to be increasing than before. The distribution of water resource in Taiwan will be more uneven.Therefo

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17

Chen, Ya-Fang, and 陳雅芳. "Analysis of the GCMB gene for family hypoparathyroidism." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/08964925636718014415.

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碩士<br>國立臺灣大學<br>分子醫學研究所<br>97<br>Hypoparathyroidium (HP) is characterized by hypocalcemia and hyperphosphatemia due to deficient or absent secretion of parathyroid hormone (PTH). Familial isolated hypoparathyroidism (FIH) is associated with the mutation of several gene, including GCMB (MIN 603716), CaSR (MIN 601199), GATA3 (MIN 131320), and PTH (MIN 168450). FIH could be autosomoal dominant, autosomal recessive or X choromosome-linked in mode of inheritance. GCMB is identified as a transcription factor and plays a role in parathyroid gland development. Our study was to examine the GCMB gene i

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18

Brandão, Francisco Vasconcelos. "Evaluation of commercially available post-consumer recycled pet to produce bottles for mineral water." Master's thesis, 2020. http://hdl.handle.net/10400.14/32994.

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O Polietileno Tereftalato (PET) é o principal polímero para a produção de garrafas de água e refrigerantes, sendo cada vez mais importante, no contexto global, o combate ao desperdício e descarte através da reciclagem deste importante recurso. Neste trabalho, seis resinas processo mecânicos aprovados pela EFSA foram avaliadas. As propriedades de cor, viscosidade intrínseca, temperatura de fusão, concentração de benzeno, limoneno, oligómeros e substâncias não intencionalmente adicionadas (NIAS) foram avaliadas. No que toca à determinação das concentrações de Benzeno, Limoneno e Oligómeros, fora

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19

Liu, Zhijie. "Genetic analysis of the role of Gcm2 gene in mouse embryonic development." 2007. http://purl.galileo.usg.edu/uga%5Fetd/liu%5Fzhijie%5F200708%5Fphd.

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20

Hsu-HuaiHong and 洪詡淮. "Analysis of Brain Functional Activity and Connectivity Using Granger Causality Model (GCM) Based on fMRI." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/25630113795357786183.

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碩士<br>國立成功大學<br>資訊工程學系碩博士班<br>100<br>The research of functional neural activity within human brain has been discussed widely in recent years, while functional Magnetic Resonance Imaging (fMRI) is one of the major equipments for examination. Due to the high spatial resolution of fMRI, the analysis of fMRI has become more and more important to medical researcher and expert. There were three goals we wished to achieve: first, to specify the active brain regions with respect to certain motions; second, to analyze the functional connectivity between these regions; finally, to describe the result of

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21

Wang, Shih-Ping, and 王釋平. "The survival analysis of Glasgow Coma Scale（GCS）in Traumatic Brain Injury patients on arrival and discharged from hospital." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/28746923861054986624.

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碩士<br>臺北醫學大學<br>傷害防治學研究所<br>95<br>In Taiwan, traumatic brain injuries (TBIs) account for 12.5% of all traumatic injuries. Analyzing the data of deceased patient, 55% of them were caused by TBIs. Since 1974, Glasgow Coma Scale (GCS) has been generally used as the tool to evaluate the cognitive function of TBIs. This research was aimed at studying the relationship between the survival of TBI patients and the scores of GCS. In study, we included 27,625 eligible cases which were collected from the data bank in 55 hospitals between July 1, 2001 to June 30, 2006, after excluding 6,452 cases, (trea

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22

Karmakar, Nirupam. "Space-Time Evolution of the Intraseasonal Variability in the Indian Summer Monsoon and its Association with Extreme Rainfall Events : Observations and GCM Simulations." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3205.

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In this thesis, we investigated modes of intraseasonal variability (ISV) observed in the Indian monsoon rainfall and how these modes modulate rainfall over India. We identified a decreasing trend in the intensity of low-frequency intraseasonal mode with increasing strength in synoptic variability over India. We also made an attempt to understand the reason for these observed trends using numerical simulations. In the first part of the thesis, satellite rainfall estimates are used to understand the spatiotem-poral structures of convection in the intraseasonal timescale and their intensity durin

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23

Karmakar, Nirupam. "Space-Time Evolution of the Intraseasonal Variability in the Indian Summer Monsoon and its Association with Extreme Rainfall Events : Observations and GCM Simulations." Thesis, 2016. http://hdl.handle.net/2005/3205.

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In this thesis, we investigated modes of intraseasonal variability (ISV) observed in the Indian monsoon rainfall and how these modes modulate rainfall over India. We identified a decreasing trend in the intensity of low-frequency intraseasonal mode with increasing strength in synoptic variability over India. We also made an attempt to understand the reason for these observed trends using numerical simulations. In the first part of the thesis, satellite rainfall estimates are used to understand the spatiotem-poral structures of convection in the intraseasonal timescale and their intensity durin

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