Дисертації з теми "Field spectrometry"
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Brown, Lauren J. "Field asymmetric waveform ion mobility spectrometry-mass spectrometry studies of peptides and proteins." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12001.
Повний текст джерелаBozec, Laurent. "Near-field photothermal Fourier-transform infrared micro-spectrometry." Thesis, Lancaster University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418454.
Повний текст джерелаSyed, Sarfaraz Uddin. "Quadrupole mass spectrometry under the influence of magnetic field." Thesis, University of Liverpool, 2012. http://livrepository.liverpool.ac.uk/5533/.
Повний текст джерелаThomas, Benjamin. "Tandem time-of-flight mass spectrometry incorporating quadratic-field technology." Thesis, University of Warwick, 2000. http://wrap.warwick.ac.uk/66998/.
Повний текст джерелаSmith, Robert W. "An evaluation of miniaturised field asymmetric waveform ion mobility spectrometry hyphenated with time-of-flight mass spectrometry." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/17837.
Повний текст джерелаHolmes, Colette Gail. "Field sampling and microcolumn preconcentration techniques in inductively coupled plasma spectrometry." Thesis, Sheffield Hallam University, 1996. http://shura.shu.ac.uk/19820/.
Повний текст джерелаMcGill, Colin Adam. "Studies of low-field nuclear magnetic resonance and Raman spectrometries for process analytical chemistry." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248282.
Повний текст джерелаMurray, Jacolin Ann. "High Flow Air Sampling for Field Detection Using Gas Chromatography-Mass Spectrometry." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2414.
Повний текст джерелаKuzema, P. O., M. Ya Dovzhyk, and O. S. Kuzema. "Main Stages of Development and Recent Advances of Mass Spectrometry." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42625.
Повний текст джерелаTaylor, M. J. "Field desorption mass spectrometry applied to polymers and compounds relevant to their synthesis." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.639167.
Повний текст джерелаZhao, Hongyan. "Development and application of high-field asymmetric waveform ion mobility spectrometry and mass spectrometry for the investigation of fibroblast growth factor signalling." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/7022/.
Повний текст джерелаBolton, David Robert. "Circuits and systems for CW and pulsed high-field electron spin resonance." Thesis, University of St Andrews, 2006. http://hdl.handle.net/10023/7104.
Повний текст джерелаBekker, Dmitriy L. "Hardware and software optimization of Fourier transform infrared spectrometry on hybrid-FPGAs /." Online version of thesis, 2007. http://hdl.handle.net/1850/4805.
Повний текст джерелаWu, Alex Ching-Hong. "Fundamentals and applications of high-field asymmetric waveform ion mobility spectrometry for the analysis of explosives." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024838.
Повний текст джерелаGagnon, Joel Edward. "Genesis of hydrothermal high field strength element mineral deposits : evidence from laser ablation--inductively coupled plasma mass spectrometry." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100367.
Повний текст джерелаMcCulloch, Ross David. "Development and characterization of a next generation, field-free atmospheric pressure photoionization (APPI) source for liquid chromatography-mass spectrometry." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44441.
Повний текст джерелаZhai, Lailiang. "Gas Chromatography: Mass Spectrometry of Chemical Agents and Related Interferents." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1266.pdf.
Повний текст джерелаConner, Laura. "Evaluation of field sampling and analysis methods for fire investigation including electronic noses and adsorption sampling/gas chromatography mass spectrometry." FIU Digital Commons, 2005. http://digitalcommons.fiu.edu/etd/2422.
Повний текст джерелаBohinski, Timothy Blaise. "STRONG FIELD MOLECULAR IONIZATION: CONTROLLED DISSOCIATION IN RADICAL CATIONS WITH DYNAMIC RESONANCES AND ADIABATICALLY PREPARED LAUNCH STATES." Diss., Temple University Libraries, 2015. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/310686.
Повний текст джерелаPh.D.
This dissertation investigates the electronic spectroscopy of a series of alkyl phenyl ketone radical cations and the dynamics of selective launch states in the strong field regime with tunable near infrared ultrashort laser pulses from 790 nm - 1550 nm coupled to mass spectrometric detection. Our method relies on tunable strong field laser pulses in the range from 1150 nm - 1550 nm to adiabatically ioinized gas phase molecules and prepare ions in the ground ionic state that serve as a launch state for future excitation and control. Adiabatic ionization is capable of transferring little energy to the molecule and producing a majority of a parent molecular ion in comparison to nonadiabatic ionization wherein multiple ionic states can be populated with an accompanying high degree of molecular fragmentation. We measure a dynamic resonance in the low lying electronic states of the acetopheone radical cation via preparation of a launch state with adiabatic ionization followed by a one photon transition within a single pulse duration which facilitates bond dissociation to produce the benzoyl ion. Experiments on acetophenone homologues and derivatives elucidate the structural dependence of the electronic resonance and supporting ab initio calculations identify the dynamic resonance along the molecular torsional coordinate between the ground ionic state, D0, and second excited state, D2. Post ionization excitation within the pulse duration transfers the ground state wavepacket to the D2 surface where the wavepacket encounters a three state conical intersection that facilitates the preferred bond dissociation. Time resolved photodissociation experiments measure the dynamics of the launch state, large amplitude oscillations and extended coherence times support the notion that adiabatic ionization populates a majority of the ground ionic surface. Control of the dissociation products is initiated from the launch state by varying the pump wavelength and probe intensity. Elimination of the D0 wavepacket with a 1370 nm reveals additional secondary dynamics that are attributed to wavepacket motion on the D2 surface. Finally, the effect of para substitution on the acetophenone radical cation is explored as a strategy to control the launch state wavepacket dynamics. Suppresion of the wavepacket dynamics are observed with the addition of alkoxy groups whereas extended coherence of the launch state dynamics approaching ~5 ps is observed upon trifluoromethyl substitution. A possible mechanism for the extended coherenece based on coupled torsional rotors is proposed.
Temple University--Theses
Alberti, James Joseph. "Fatty Acid Biomarker Detection for Breast Cancer Using Differential Mobility Spectrometry with Non-Radioactive Ion Source." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6611.
Повний текст джерелаReid, Joy Emily. "The development and geological application of a whole rock-LA-ICP-MS technique for the determination of high field strength elements." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0004/MQ42434.pdf.
Повний текст джерелаGhalaieny, Mohamed. "Lab and field studies of the kinetics and composition of atmospheric reactive nitrogen and volatile organic compounds." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/lab-and-field-studies-of-the-kinetics-and-composition-of-atmospheric-reactive-nitrogen-and-volatile-organic-compounds(14561aed-da23-44e8-8819-c752f0f9613d).html.
Повний текст джерелаPeterson, Zlatuse Durda. "Analysis of Clinically Important Compounds Using Electrophoretic Separation Techniques Coupled to Time-of-Flight Mass Spectrometry." BYU ScholarsArchive, 2004. https://scholarsarchive.byu.edu/etd/23.
Повний текст джерелаParrish, Douglas K. "Application of solid phase microextraction with gas chromatography-mass spectrometry as a rapid, reliable, and safe method for field sampling and analysis of chemical warfare agent precursors /." Download the dissertation in PDF, 2005. http://www.lrc.usuhs.mil/dissertations/pdf/Parrish2005.pdf.
Повний текст джерелаPaudel, Liladhar. "High Field 1H Nuclear Magnetic Resonance (NMR) Spectroscopy Based Metabolomics and Complex Mixture Analysis by Multidimensional NMR and Liquid Chromatography-Mass Spectrometry (LC-MS)." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1343403647.
Повний текст джерелаMcDonald, Shannon Scott. "Characterization and optimization of a high surface area-solid phase microextraction sampler for the collection of trace level volatile organic compounds in the field /." Download the thesis in PDF, 2006. http://www.lrc.usuhs.mil/dissertations/pdf/McDonald2006.pdf.
Повний текст джерелаSales, Martínez Carlos. "Development of advanced analytical methodologies based on gas chromatography coupled to mass spectometry for the determination of pops and vocs in the food and environmental field." Doctoral thesis, Universitat Jaume I, 2019. http://hdl.handle.net/10803/668939.
Повний текст джерелаEl trabajo en la presente tesis se ha dividido claramente en tres partes: En la primera parte, los esfuerzos se dirigieron a la obtención de un método de cuantificación a nivel de trazas para retardantes de llama halogenados utilizando inyecciones de gran volumen y cromatografía de gases acoplada a espectrometría de masas en tándem GC-MS/MS. En la segunda parte, se evaluó el potencial de la técnica GC-MS/MS junto con la nueva fuente de ionización química a presión atmosférica (APCI) para la cuantificación de PBDEs, NBFRs (incluido el hexabromociclododecano (HBCD)) y DL-PCBs a niveles de traza en alimentos y muestras ambientales. En la tercera parte, se desarrollaron dos metodologías de análisis no dirigido por GC-MS como herramientas complementarias de la PRUEBA DE PANEL para la clasificación del aceite de oliva de acuerdo a su calidad.
Chau, Thoi-Dai. "Réactions chimiques sur surfaces de platine et d'or à l'échelle atomique: approche théorique et expérimentale." Doctoral thesis, Universite Libre de Bruxelles, 2004. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211119.
Повний текст джерела\
Doctorat en sciences, Spécialisation chimie
info:eu-repo/semantics/nonPublished
Al, Manasfi Rayana. "Uptake of organic micropollutants by vegetable crops irrigated by reclaimed wastewater : Analytical developments to conduct field studies." Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTG037.
Повний текст джерелаThe use of wastewater in agricultural sector for irrigation and fertilization purposes is not a recent practice. However, until the past couple decades this practice has been of increasing interest regarding the global safety, particularly human health. Besides to the useful nutrients and organic matter that wastewater introduces to the agricultural lands, pharmaceutical active compounds (PhACs) and other organic micropollutants are also co-introduced leading to the presence of undesired chemicals in agroecosystems, most remarkably in crops intended for human consumption. Incredible effort has been made in last couple decades to analyze such contaminants in environmental samples, yet there is still a lack of robust analytical methods for the extraction and quantification of a large number of PhACs and other wastewater pollutants, and a lack of knowledge regarding their fate and behavior in the entire agroecosystem including soil and crops.In this context, the first objective of this thesis was to develop robust and sensitive analytical methodologies specific to soil and crops matrices (e.g., root and leave) to analyze a large number of wastewater organic contaminants mainly PhACs and their metabolites. QuEChERS-based methods followed by detection and quantification on high-resolution mass spectrometry were successfully developed for soil, lettuce/leek root and lettuce/leek leaves. Good recoveries were obtained for the 48 studied compounds in all matrices (in general between 80 and 120 % for most of the compounds). Detection and quantification of compounds was performed on a high-resolution mass spectrometry on quadrupole-time of flight (Q-TOF) coupled to liquid chromatography provided from SCIEX technology. Comparing the two recently developed acquisition modes high-resolution multiple reaction monitoring (MRMHR) and Sequential Window Acquisition of All Theoretical Fragment-Ion Spectra (SWATH) gave similar results, though MRMHR gave more consistent results for most of the compounds. Finally, satisfying detection and quantification limits were obtained for all 3 matrices, for instance lettuce leaves matrix in MRMHR acquisition gave detection limits ranging from 0.01 to 0.12 ng/g and quantification limits ranging from 0.04 to 0.38 ng/g dry weight (d.w).Later, the following objective was to apply these methodologies on real agricultural field irrigated with local treated domestic wastewater. The second objective allowed us to understand the distribution of selected contaminants in soil and crops and calculate their bioconcentration factors, to discriminate their degradation in soil and crops, and finally to assess the potential risk for human consumption of wastewater irrigated crops. Two years of successive growth cycles of lettuce and leek under greenhouse field conditions were successfully implemented. Different kinds of water were used for irrigation mainly domestic treated wastewater, following real drip irrigation conditions. Little accumulation in soil and crops was found, which was explained by the intensive degradation of contaminants in soil and metabolism in crops. A few metabolites were detected in lettuce leaves, particularly carbamazepine-epoxide which was produced by the lettuce metabolism. Finally, this study revealed a de minimis human health risk related to the consumption of raw vegetable irrigated with treated wastewater.The last objective was to study the fate of selected contaminants introduced in soil by wastewater irrigation, when they are exposed to the ubiquitous filamentous soil fungi Trichoderma. Implemented experiments in liquid medium revealed for the first time an important ability of Trichoderma species, namely T. harzanium and T. asperellum to degrade two fluoroquinolones antibiotics (ciprofloxacin and ofloxacin), and one fungicide (climbazole). Equally important, new metabolites of ofloxacin and climbazole were tentatively identified in this study for the first time
Green, P., Ngozi G. Anyakoha, I. Gispan-Herman, G. Yadid, and Anna Nicolaou. "Arachidonic acid-containing phosphatidylcholine species are increased in selected brain regions of a depressive animal model: implications for pathophysiology." Elsevier, 2009. http://hdl.handle.net/10454/4584.
Повний текст джерелаThe Flinders Sensitive Line (FSL) rat is a genetic animal model of depression. Following recent findings that the brain fatty acid composition of FSL is characterised by increased arachidonic acid (AA), we used electrospray tandem mass spectrometry and 1H-NMR to examine lipid species in different brain areas. Cholesterol and sphingolipids were increased in the hypothalamus of the FSL rats. Furthermore, arachidonic acid-containing phosphatidylcholine species (AA-PC) were elevated with PC16:0/20:4, PC18:1/20:4 and PC18:0/20:4 (p<0.003) increased in the hypothalamus and striatum. In contrast, there was a decrease in some docosahexaenoic acid (DHA)-containing species, specifically PC18:1/22:6 (p<0.003) in the striatum and PE18:1/22:6 (p<0.004) in the prefrontal cortex. Since no significant differences were observed in the erythrocyte fatty acid concentrations, dietary or environmental causes for these observations are unlikely. The increase in AA-PC species which in this animal model may be associated with altered neuropathy target esterase activity, an enzyme involved in membrane PC homeostasis, may contribute to the depressive phenotype of the FSL rats.
Le, Galudec Joël. "lmagerie hyperspectrale infrarouge pour l'identification sans marquage de pathogènes sur milieu gélosé." Thesis, Université Grenoble Alpes, 2022. http://www.theses.fr/2022GRALS006.
Повний текст джерелаIndustry and health care are demanding rapid and inexpensive means for microbial identification. Thanks to its low cost and practical advantages, Petri dish culture is a ubiquitous tool in microbiology, but the sole observation of microbial colonies does not offer a reliable diagnosis. Identification in itself depends on secondary analysis, such as chemical reactions, PCR or mass spectrometry, which require specific sample preparation, which involves additional costs and delays. That is why several dish imaging systems have already been tested to automate the observation of cultures and to propose an identification directly on the Petri dish. However, these systems are generally limited to the visible and near infrared range (400 - 1000 nm), which only provides information on the morphotype of the microorganism colonies and therefore limits the identification accuracy.This thesis focuses on the development of a multispectral imaging system in the mid-infrared. In this wavelength range, images provide information on both the morphotype and the chemical composition of the observed colonies. This non-destructive and label-free imaging could provide species identification of colonies grown on agar, while opening the way to new applications. An experimental system, combining quantum cascade lasers as a light source and a microbolometers array as an imager, allowed the acquisition of images of colonies at nine wavelengths between 5 and 8 µm. 2253 colonies belonging to eight species of common microorganisms were imaged. For one of the species, Staphylococcus epidermidis, three different strains were analyzed to test the typing capabilities of the system.After acquisition, several image classification methods were tested to obtain an average correct identification rate of 94.4%
Le, Breton Michael Robert. "Airborne measurements of trace gases using a Chemical Ionisation Mass Spectrometer (CIMS) onboard the FAAM BAe-146 research aircraft." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/airborne-measurements-of-trace-gases-using-a-chemical-ionisation-mass-spectrometer-cims-onboard-the-faam-bae146-research-aircraft(84308915-6dae-46d8-acb6-f189683e3e6d).html.
Повний текст джерелаRösch, Tobias [Verfasser]. "Filling the gap in environmental analysis : enrichment of ionizable micropollutants by electromembrane extraction or field-step electrophoresis and their analysis by capillary electrophoresis and liquid chromatography mass spectrometry for (non-)target screening / Tobias Rösch." Tübingen : Universitätsbibliothek Tübingen, 2022. http://d-nb.info/1240673264/34.
Повний текст джерелаBrenac, Ariel. "Développements instrumentaux pour la photoémission inverse." Grenoble 1, 1987. http://www.theses.fr/1987GRE10010.
Повний текст джерелаAgbonkonkon, Nosa. "Counter-flow Ion Mobility Analysis: Design, Instrumentation, and Characterization." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2136.pdf.
Повний текст джерелаManea, Vladimir. "Penning-trap mass measurements of exotic rubidium and gold isotopes for a mean-field study of pairing and quadrupole correlations." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112246/document.
Повний текст джерелаThe most complex nuclei are situated between the magic and the mid-shell ones, in regions known for sudden changes of the trends of nuclear observables. These are the so-called shape-transition regions, where the nuclear paradigm changes from the vibrational liquid drop to the static rotor. With few exceptions, nuclei in these regions are radioactive, with half-lives dropping into the millisecond range.Complementing the information obtained from the low-lying excitation spectrum, nuclear binding energies and mean-square charge radii are among the observables most sensitive to these changes of nuclear structure. In the present work, a study of the shape-transition phenomenon is performed by measurements of radioactive nuclides produced by the ISOLDE facility at CERN. The masses of the neutron-rich rubidium isotopes 98−100Rb and of the neutron-deficient gold isotopes 180,185,188,190,191Au are determined using the Penning-trap mass spectrometer ISOLTRAP. The mass of 100Rb is determined for the first time. Significant deviations from the literature values are found for the isotopes 188,190Au. A new experimental method is presented, using a recently developed multi-reflection time-of-flight mass spectrometer as a beam-analysis tool for resonance-ionization laser spectroscopy. The new method opens the path to measurements of atomic hyperfine spectra with ISOLTRAP, from which charge radii and electromagnetic moments of radioactive nuclides can be extracted. The properties of the studied nuclides map the borders of two prominent regions of quadrupole deformation, which constrain the fine balance between pairing and quadrupole correlations in the nuclear ground states. This balance is studied by the Hartree-Fock- Bogoliubov (HFB) approach. The sensitivity of the shape-transition phenomenon to the strength of pairing correlations is demonstrated. In particular, the strong odd-even staggering of charge radii in the mercury isotopic chain is shown to result in the HFB approach from the fine interplay between pairing, quadrupole correlations and quasi-particle blocking
Døhlen, Kjetil. "Design of an interferometric spectrometer for environmental surveillance." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283824.
Повний текст джерелаKopelvski, Maycon Max. "Sistema de caracterização elétrica de dispositivos emissores de campo." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-28032008-174207/.
Повний текст джерелаAt this work is presented the development of a field emission devices trial system to render possible to obtain the electrical characteristics of the field emission devices. Here are shown some results taken from some trials. During the development of the trial system, it was used at the programming microcontroller stage, the environment of programming supplied by the manufacturer of the microcontroller. At this development, peripheral of input and output from the microcontroller, like, keyboard reading, USART manipulation, SPI manipulation and analogic to digital converters were used. At the microcontroller were implanted routines of configuration, customing and display sweeping, besides the transmission and the receiving of instructions came from the computer. For computer, a program was elaborated dedicated for manipulation of the trials system applying the virtual instrumentation concept, storing readings of the trials as well as the visualization \"on-line\" of the course of the trial through available graphs in the program. As an important result of this work has the establishment of a system for trial of field emission devices controlled on place or remotely, system that is composed by hardware and software in which were made several trials with acquisition and data manipulation and the presentation of received information.
Mitri, Georges Habib. "An investigation in the use of advanced remote sensing and geographic information system techniques for post-fire impact assessment on vegetation." Doctoral thesis, Università degli studi di Trieste, 2008. http://hdl.handle.net/10077/2662.
Повний текст джерелаGli incendi boschivi rappresentano uno dei maggiori problemi ambientali nella regione Mediterranea con vaste superfici colpite ogni estate. Una stima dell’impatto ambientale degli incendi (a breve e a lungo termine) richiede la raccolta di informazioni accurate post-incendio relative al tipo di incendio, all’intensità, alla rigenerazione forestale ed al ripristino della vegetazione. L’utilizzo di tecniche avanzate di telerilevamento può fornire un valido strumento per lo studio di questi fenomeni. L’importanza di queste ricerche è stata più volte sottolineata dalla Commissione Europea che si è concentrata sullo studio degli incendi boschivi ed il loro effetto sulla vegetazione attraverso lo sviluppo di adeguati metodi di stima dell’impatto e di mitigazione. Scopo di questo lavoro è la stima dell’impatto post-incendio sulla vegetazione in ambiente Mediterraneo per mezzo di immagini satellitari ad alta risoluzione, di rilievi a terra e mediante tecniche avanzate di analisi dei dati. Il lavoro ha riguardato lo sviluppo di un sistema per l’integrazione di dati telerilevati ad altissima risoluzione spaziale e spettrale. Per la stima dell’impatto a breve termine, un modello di classificazione ad oggetti è stato sviluppato utilizzando immagini Ikonos ad altissima risoluzione spaziale per cartografare il tipo di incendio, differenziando l’incendio radente dall’incendio di chioma. I risultati mostrano che la classificazione ad oggetti potrebbe essere utilizzata per distinguere con elevata accuratezza (87% di accuratezza complessiva) le due tipologie di incendio, in particolare nei boschi Mediterranei aperti. È stata inoltre valutata la capacità della classificazione ad oggetti di distinguere e cartografare tre livelli di intensità del fuoco utilizzando le immagini Ikonos e l’accuratezza del risultato è stimata all’ 83%. Per la stima dell’impatto a lungo termine, la mappatura della rigenerazione post-incendio (pino) e la ripresa della vegetazione arbustiva sono state valutate mediante tre approcci: 1) la classificazione ad oggetti di immagini ad altissima risoluzione QuickBird che ha permesso di mappare la ripresa della vegetazione e l’impatto sulla copertura a seguito dell’incendio distinguendo due livelli di intensità dell’incendio (accuratezza della classificazione 86%). 2) l’analisi statistica di dati iperspettrali rilevati in campo che ha permesso una riduzione del 97% del volume di dati e la selezione delle migliori 14 bande per discriminare l’età e le specie di pino e le 18 migliori bande per la caratterizzazione delle specie arbustive. Successivamente, i dati iperspettrali Hyperion sono stati utlizzati per mappare la rigenerazione forestale e la ripresa della vegetazione. L’accuratezza complessiva della classificazione è stata del 75.1% considerando due diverse specie di pino ed altre specie vegetali. 3) una classificazione ad oggetti che ha combinato l’analisi dei dati QuickBird ed Hyperion. Si è registrato un aumento dell’accuratezza della classificazione pari all’8.06% rispetto all’utilizzo dei soli dati Hyperion. Complessivamente, si osserva che strumenti avanzati di telerilevamento consentono di raccogliere le informazioni relative alle aree incendiate, la rigenerazione forestale e la ripresa della vegetazione in modo accurato e vantaggioso in termini di costi e tempi.
Forest fires are a major environmental problem in the Mediterranean region, where large areas are affected each summer. An assessment of the environmental impact of forest fires (in the short-term and in the long-term) requires the collection of accurate and detailed post-fire information related to fire type, fire severity, forest regeneration and vegetation recovery. Advanced tools in remote sensing provide a powerful tool for the study of this phenomenon. The importance of this work was often emphasized by the European Commission, which focused on the studying of forest fires and their effect on vegetation through the development of appropriate impact assessment and mitigation methods. The aim of this study was to assess the post-fire impact on vegetation in a Mediterranean environment by employing high quality satellite and field data and by using advanced data processing techniques. The work entailed the development of a whole system integrating very high spatial and spectral resolution remotely sensed data. For short-term impact assessment, an object-oriented model was developed using very high spatial resolution Ikonos imagery to map the type of fire, namely, canopy fire and surface fire. The results showed that object-oriented classification could be used to accurately distinguish and map areas of surface and crown fire spread (overall accuracy of 87%), especially that occurring in open Mediterranean forests. Also, the performance of object-based classification in mapping three levels of fire severity by employing high spatial resolution Ikonos imagery was evaluated, and accuracy of the obtained results was estimated to be 83%. As for long-term impact assessment, the mapping of post-fire forest regeneration (pine) and vegetation recovery (shrub) was performed by following three different approaches. First, the developed object-based classification of QuickBird (very high spatial resolution) allowed post-fire vegetation recovery and survival mapping of canopy within two different fire severity levels (86% of classification accuracy). The main effect of fire has been to create a more homogeneous landscape. Second, statistical analysis of field hyperspectral data allowed a 97% reduction in data volume and recommended 14 best narrowbands to discriminate among pine trees (age and species) and 18 bands that best characterize the different shrub species. Then, hyperspectral Hyperion was employed for mapping post-fire forest regeneration and vegetation recovery. The overall classification accuracy was found to be 75.81% when mapping two different regenerated pine species and other species of vegetation recovery. Third, an object-oriented combined analysis of QuickBird and Hyperion was investigated for the same objective. An improvement in classification accuracy of 8.06% was recorded when combining both Hyperion and QuickBird imageries than by using only the Hyperion image. Overall, it was observed that advanced tools in remote sensing provided the necessary means for gathering information about the burned areas, the regenerated forests and the recovered vegetations in a successful and a timely/cost effective manner.
XX Ciclo
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Bertin, Gwladys. "Etude différentielle des protéines membranaires exprimées à la surface de l'hématie infectée par Plasmodium falciparum, en fonction de la symptomatologie." Thesis, Paris 5, 2013. http://www.theses.fr/2013PA05P635/document.
Повний текст джерелаPlasmodium falciparum is responsible for severe malaria (cerebral malaria, CM and pregnancy associated malaria, PAM). During the intra-erythrocytic maturation of P. falciparum, parasite-derived proteins are expressed, exported and presented at the surface of the infected erythrocyte (iE) membrane. These include Plasmodium falciparum erythrocyte membrane protein-1 (PfEMP-1). PfEMP-1 is a highly polymorphic adherence receptor, variants of which have been assigned to four groups (A-E) based on their sequence homology. Semi-conserved types, defined by tandem runs of specific domains (“domain cassettes” (DC)), are also recognized. The PfEMP-1 type expressed determines the iE adherence phenotype, and is associated with the clinical outcome of infection. Parasite isolates from Beninese children or women presenting with, respectively, CM or PAM were collected along with samples from patients with uncomplicated malaria (UM). We assessed the transcript level of var genes by RT-qPCR and the expression of membrane and hypothetical proteins of Plasmodium by LC-MS/MS. Obtaining LC-MS/MS data enabled a comparison of hypothetical and membrane proteome samples from PAM and CM for comparison with UM samples. The proteomics-based identification of PfEMP-1 showed the expression of a particular PfEMP-1, VAR2CSA, in PAM isolates. These results corroborate the analysis of gene transcripts showing that var2csa is overexpressed in PAM, with transcripts found in isolates from infections both early and late in pregnancy. The PfEMP-1 variants identified in CM samples were predominantly from the Ups groups A and B/A, and most of the peptides identified by LC-MS/MS were associated with the DC8 cassette for which the transcripts were also overexpressed. Analysis using filter-based feature selection identified subsets of 13 and 14 proteins, assigned either as hypothetical or membrane proteins that were predictive of PAM and CM syndromes respectively. The presence of VAR2CSA amongst the proteins overexpressed in PAM samples validates the analytical approach. PFI1785w has previously been identified and associated with the PAM, whilst four other proteins, PFB0115w, PFF0325c, PFA_0410w and PF14_0018, appear to be also predictive of the syndrome. PfEMP-2 protein and antigen-332 were found to be specifically expressed in CM samples. Three other proteins, assigned as ‘exported’ but with unknown function, were also associated with CM samples. Obtaining and analyzing LC-MS/MS-derived data from protein extracts of field isolates represents the originality of this work and it allowed the identification of correlations between clinical and biological data. This study confirms the transcriptional data relating to the var gene family and provides evidence of new protein interactions in the context both of malaria associated with pregnancy and of cerebral malaria
Rouleau, Gary. "An electron spectrometer using adiabatic motion in a magnetic field /." Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65933.
Повний текст джерелаAnyakoha, Ngozi Gloria. "Fatty acid and lipid profiles in models of neuroinflammation and mood disorders : application of high field NMR, gas chromotography and liquid chromotography-tandem mass spectrometry to investigate the effects of atorvaststin in brain and liver lipids and explore brain lipid changes in the FSL model of depression." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4328.
Повний текст джерелаAnyakoha, Ngozi G. "Fatty acid and lipid profiles in models of neuroinflammation and mood disorders. Application of high field NMR, gas chromotography and liquid chromotography-tandem mass spectrometry to investigate the effects of atorvaststin in brain and liver lipids and explore brain lipid changes in the FSL model of depression." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4328.
Повний текст джерелаRen, Deqing. "New techniques of multiple integral field spectroscopy." Thesis, Durham University, 2001. http://etheses.dur.ac.uk/3800/.
Повний текст джерелаLíšková, Ivana. "Stanovení geotechnických vlastností zemin s využitím metody Elektrické impedanční spektrometrie." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265699.
Повний текст джерелаGarcía, Fusté María José. "Neutron spectrometry in complex n - y fields: Application to LINAC and PET facilities." Doctoral thesis, Universitat Autònoma de Barcelona, 2010. http://hdl.handle.net/10803/3427.
Повний текст джерелаEl manuscrito describe el diseño, caracterización y aplicación del nuevo espectrómetro pasivo de esferas Bonner para neutrones de la UAB. La matriz de respuesta en energía del espectrómetro se ha simulado con técnicas de Monte‐Carlo y se ha validado experimentalmente con irradiaciones en campos neutrónicos de referencia. Se ha establecido un procedimiento para estimar el límite de detección de la tasa de fluencia neutrónica. El BSS pasivo de la UAB se ha utilizado para medir los espectros de neutrones alrededor de 7 aceleradores LINAC diferentes. A partir de los resultados obtenidos se han estudiado los efectos de la utilización de diferentes técnicas de irradiación, de diferentes energías nominales del haz de fotones y de diferentes geometrías de las salas de irradiación. El espectrómetro también se ha utilizado para determinar los espectros de neutrones alrededor de 2 ciclotrones PET, uno de ellos una máquina sin blindaje, el otro un ciclotrón auto‐blindado.
The present work deals with the need of characterising experimentally the neutron fields generated in LINAC and PET medical facilities. These fields may be pulsed, intense and mixed with high energy predominant photon component, where active instruments may experiment some limitations such as pulse pile‐up, dead‐time and radiofrequency interferences. To overcome these difficulties, a passive Bonner sphere spectrometer (BSS), using pure gold foils as central detectors, has been recently developed in the laboratory of the Grup de Física de les Radiacions at the UAB. This spectrometer should tolerate exposures in extreme environment conditions of temperature and humidity, and should be able to measure neutron spectra in such environments independently on their direction of incidence and over a wide energy range (from 1meV up to 20 MeV).
The manuscript describes the design, characterisation and application of the new UAB neutron passive Bonner sphere spectrometer. The energy response matrix of the spectrometer has been simulated with Monte‐Carlo techniques and experimentally validated with irradiations in reference neutron fields. A procedure to estimate the neutron fluence rate detection limit has also been established. The UAB passive BSS has been used to measure the neutron spectra around 7 different LINAC accelerators to study the effects of using different irradiation techniques, nominal beam energies and room geometries. The spectrometer has also been used to determine the neutron spectra around 2 PET cyclotrons, one of them an un‐shielded machine, the other one a self‐shielded one.
Fuchs, Martin R. "A high field, high frequency electron paramagnetic resonance spectrometer (360 GHz, 14 T)." [S.l. : s.n.], 1999. http://www.diss.fu-berlin.de/2000/7/index.html.
Повний текст джерелаGouilleux, Boris. "Gradient-based methodson a benchtop spectrometer : new perspectives for low-field NMR spectroscopy." Thesis, Nantes, 2017. http://www.theses.fr/2017NANT4036/document.
Повний текст джерелаHigh-field NMR based on superconducting magnets involves an expensive and bulky equipment, which has hampered the use of NMR in harsh environments. A new generation of benchtop NMR spectrometers, compact and cryogen free, has brought NMR spectroscopy under the chemist’s fume-hood and as close as possible to production sites. The driving force of this PhD project is to improve the analytical performance of these benchtop NMR systems. We report here the first implementation of Ultrafast (UF) 2D NMR- a method yielding 2D NMR spectra in a single scan- as well as modern gradient-based solvent suppression methods on a 43 MHz benchtop spectrometer, including a B0-gradient coil. Substantial optimizations have led to UF experiments at low-field (LF) with a reasonable performance while the acquisition duration is reduced by one order of magnitude. Then, the presence of non-deuterated solvents –commonly used in LF NMR– has been tackled by the development of suppression methods both in static and flowing conditions. This methodological effort has opened new opportunities for benchtop NMR applications. Several on- and in-line real-time monitorings have been performed on different types of chemical reactions: Heck-Matsuda coupling reaction, oxidative neutralization of mustard-gas simulants or even the synthesis of a natural product in flow-chemistry. Besides applications to process monitoring, UF 2D NMR at 43 MHz has been successfully applied to discriminate the botanical origins of a panel of edible oils. This fast 2D approach has provided a better classification than standard 1D experiments while remaining compatible with high-throughput analysis
Dreyfus, Matthew A. "Laboratory and field measurements of organic aerosols with the photoionization aerosol mass spectrometer." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 166 p, 2008. http://proquest.umi.com/pqdweb?did=1654492141&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Повний текст джерелаBostrom, Gregory Alan. "Modifications to a Cavity Ringdown Spectrometer to Improve Data Acquisition Rates." PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2208.
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