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Dissertations / Theses on the topic 'Time domain NMR'

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Published: 9 March 2023

Last updated: 10 March 2023

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1

Urbańczyk, Mateusz, Wiktor Koźmiński, and Krzysztof Kazimierczuk. "A combined sparse sampling of time-gradient domain for NMR diffusometry and relaxometry: A combined sparse sampling of time-gradient domain for NMR diffusometry and relaxometry." Diffusion fundamentals 20 (2013) 105, S. 1, 2013. https://ul.qucosa.de/id/qucosa%3A13693.

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2

Marigheto, Niusa A. "Time-Domain NMR Studies of the Internal Quality of Horticultural Products." Thesis, University of East Anglia, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485289.

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Nuclear Magnetic Resonance was used to investigate selected fruit with internal defects and at different stages of ripening. This was motivated by the need for an industrial NMR sensor of fruit and vegetable quality capable of operating at typical industrial conveyor speeds. Such a sensor requires the development of NMR protocols capable of determining fruit and vegetable quality in a single-shot manner. It also requires knowledge of which combination of NMR parameters is most sensitive to the quality factor of interest. In this thesis we therefore address this issue by exploring the off-line relationship between NMR parameters and fruit quality. We mainly focus on three areas: the detection of mealiness in apples, the single-shot measurement of Brix, and a single-shot measurement of oil in avocado. One dimensional techniques, measuring transverse relaxation times, were used as starting point. The correlation between mealiness and one dimensional was not observed at low fields. Therefore two-dimensional approaches were taken. The first of these was correlation spectroscopy, which showed that the of the water associated with the cell wall in mealy apples is much longer that that of fresh apples. This in principle could be used to classify apples. The differences between fresh and mealy apples observed with the second two-dimensional protocol, could ~ot be used to classify apples. However, when the technique was applied to avocado, it became clear that the difference between the diffusion coefficients of water and oil could be exploited for an on-line application. A fast pulse sequence was developed and the off-line measurements showed a good correlation between oil content and the echo ratio. A similar protocol was developed for the on-line measurement of Brix value in apple and strawberry.

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3

DIBBANTI, MURALI KRISHNA. "Study of polymer cross-link density by time domain NMR spectroscopy." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/83654.

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Elastomeric polymers are important materials for many applications due to their exceptional long-range elastic property obtained by cross-linking. The cross-linking is the process of creating three dimensional network structure in the polymer materials and induces elasticity. Hence, the precise characterization of the molecular weight (Mc) between cross-links or other topological constraints (i.e. entanglements, filler etc.) is essential for tuning the elastic response in polymer networks. There are several techniques available for polymer network cross-link density measurement, among them equilibrium swelling and nuclear magnetic resonance (NMR) spectroscopy are widely used. Particularly multiple–quantum (MQ) NMR spectroscopy technique is emerging as an excellent tool for network characterization in the molecular level for last three decades. The unique advantage of this technique over the equilibrium swelling is that it gives the cross-link density together with cross-link distribution, besides being a rapid and solvent free technique. MQ NMR can be applied on inexpensive low resolution instrument without compromising on the data quality, where chemical shift resolution is not necessary. Moreover, other NMR pulse sequences are available for characterizing other polymer properties such as bound rubber fraction in filled networks, polymer dynamics, segmental motions etc. In the present work, MQ proton NMR has been used to obtain the dipolar coupling constant and the cross-link density in different classes of elastomers (commercial formulation for tire industry, polyacrylate networks and shape memory ionic elastomers). The robustness of the cross-link density measurements obtained from equilibrium swelling method (both phenomenological and statistical models) is compared with MQ NMR results in formulation for tire application. Thiol probes have been applied to quantify ranking of sulfidic bridges as a function of curing time in the network. The Kraus, Lorenz and Parks correction for filler restriction on swelling has been validated from the MQ NMR results. Differently from the published papers, focused on the effect of different vulcanization conditions at the optimum curing time, here the kinetics of vulcanization is studied. In this way a detailed and comprehensive picture of the polymer network as function of curing time is provided. Particularly Baum-Pines NMR pulse sequence allows the measurement of weak dipolar coupling constants in sulfur cured natural rubber, carbon black (N234) filled polyisoprene, polybutadiene and polyisoprene/polybutadiene blend networks. The network degradation has been studied by measuring the cross-link density as a function of curing time. Furthermore the five pulse MQ sequences have been applied for measuring relatively strong dipolar coupling constants in thermally cured cross-linked polybutylacrylate networks. The cross-link density and bound rubber fraction around the ionic domains in a shape memory polymer network - (carboxylated nitrile butyl rubber (XNBR) - have been obtained by the combination of Baum-Pines and 5 pulse MQ NMR sequences. The combined approach of Baum-Pines and 5 pulse MQ NMR gives cross-link density, allowing the estimation of bound rubber fraction as well. The measured bound rubber fraction has been further validated by magic sandwich echo NMR experiments, standard approach in this field. Finally the vulcanization curves and temperature dependent mechanical properties have been studied by rubber processing analyzer (RPA), using time-temperature superposition principle. Therefore this study allows proposing time domain-NMR as an inexpensive, fast and solvent-free (green) technique readily available for quality control and day to day R&D purposes.

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4

Urbańczyk, Mateusz, Wiktor Koźmiński, and Krzysztof Kazimierczuk. "A combined sparse sampling of time-gradient domain for NMR diffusometry and relaxometry." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183971.

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5

Musgrave, Christopher S. A. "Development of high energy laser target materials : synthesis of low density porous polymers, and characterisation using time domain nuclear magnetic resonace." Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/7074.

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This work details the synthesis of low density porous polymers, and characterisation with an emphasis on Time Domain Nuclear Magnetic Resonance (TD-NMR). High energy laser physics utilises low density porous polymers to study astrophysical phenomena at high pressures and temperatures in the form of plasma. Low Z, low density Polymerised High Internal Phase Emulsions (PolyHIPE) and aerogels form a large part of these capabilities, however increasingly stringent laser target parameters are now required to develop new capabilities. For low density porous polymers, this demands greater control over properties such as pore size, density, composition (C[sub]nH[sub](>n)) and homogeneity through novel synthesis and characterisation. Microstructure inhomogeneity of styrene-co-divinyl benzene (S-co-DVB) polyHIPEs in conjunction with novel t-butyl styrene and para divinyl benzene polyHIPEs were investigated using ¹H spin-lattice (T₁) and spin-lock (T[sub](1ρ)) NMR relaxation experiments using TD-NMR. The strong relationship between ¹H spin-lattice relaxation times and Dynmaic Mechanical Analysis (DMA) data, and application of relaxation experiments at varied temperatures reveal that structural inhomogeneity is based on poor emulsion stability and clustering of DVB polymer affecting bulk molecular motion. Divinyl benzene (DVB) aerogels and a range of innovative C[sub]nH[sub](>n) aerogels such as poly-5-vinyl-2-norbornene were synthesised using free-radical, cationic or ring opening metathesis polymerisation techniques. A one-step synthesis of homogeneous density gradient DVB aerogels was developed for the first time, which is fundamental to be able to study plasma shock fronts. Characterisation using X-ray tomography revealed the homogeneous density gradient. Successful carbonisation of dichloroparaxylene (DCPX) aerogels has similar properties to resorcinol-formaldehyde (RF) aerogels, but is produced in significantly less time and shrinkage, presents as a candidate for future laser experiments. Correlation between NMR relaxation times to established techniques of DMA and mercury porosimetry was explored to determine the suitability of TD-NMR in characterisation of low density porous polymers.

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6

Nie, Shouliang [Verfasser], and M. [Akademischer Betreuer] Wilhelm. "Aging of Natural Rubber Studied via Fourier-Transform Rheology and Time-Domain NMR / Shouliang Nie ; Betreuer: M. Wilhelm." Karlsruhe : KIT-Bibliothek, 2020. http://d-nb.info/1214301509/34.

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7

Brizi, Leonardo <1986&gt. "Time Domain and Spatially Resolved NMR: Advanced Applications to Porous Media of Interest to Environmental Sustainability and Human Healthcare." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7271/1/brizi_leonardo_tesi.pdf.

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Time-domain and spatially resolved NMR techniques developed in the field of Magnetic Resonance for fluids in Porous Media have been successfully applied to study various porous systems of different nature and origin, containing hydrogenous fluids. The unifying principle of this work is showing how the NMR analyses performed with these techniques can be extended to a multiplicity of porous material and how these methods are able to investigate the structure of the pore space and other features in a non-destructive manner, on the intact sample, from the macroscopic scale to the nanometric one. In particular, NMR relaxometry has been applied to the study of coral skeleton modifications due to Ocean Acidification. Skeletal porosity over length scales spanning from tens of nanometers to tens of micrometers was evaluated, giving precious information about the capability of coral to acclimate under adverse conditions. Another application of relaxometry was about the study of water compartmentalization for monitoring viability and water compartmentalization of cell populations kept under stress conditions. Parallel experiments performed by MRI and NMR single-sided techniques were executed in order to test the efficiency of protectives and consolidants applied for preserving and restore carbonate building materials of interest to Cultural Heritage. The study confirmed that quantitative MRI and NMR profiles are excellent tools for evaluating the performance of protective compounds. On the same samples the 2D NMR techniques were settled and implemented, showing the great potentiality in order to detect the pore space structure and in particular the surface-to-volume ratio, the tortuosity and the connectivity of the medium. The results of this thesis demonstrate that the same experimental NMR procedures can be successfully applied to perform researches in important topics that deal with the Sustainability of Environment and Human Healthcare.

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8

Keller, Jonas Sebastian [Verfasser], and M. [Akademischer Betreuer] Wilhelm. "Molecular relaxation of partially deuterated polyisoprene model melts studied by rheology and $^1\textH}$/$^2\textH}$ time domain NMR / Jonas Sebastian Keller ; Betreuer: M. Wilhelm." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1238148441/34.

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9

Ungarato, Rafael Fernando De Santi 1988. "Influência da molhabilidade de rochas na recuperação avançada de petróleo : um estudo por RMN." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250155.

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Orientador: Edvaldo Sabadini
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Química
Made available in DSpace on 2018-08-22T20:35:03Z (GMT). No. of bitstreams: 1 Ungarato_RafaelFernandoDeSanti_M.pdf: 3937275 bytes, checksum: bb5e422a60e0f90e98a552f1ea02db61 (MD5) Previous issue date: 2013
Resumo: O estudo de soluções para métodos especiais de recuperação de petróleo vem sendo amplamente utilizado, principalmente devido à grande quantidade de óleo remanescente nos reservatórios após as recuperações primária e secundária. Soluções consideradas de potencial recuperador devem possuir algumas características específicas como uma baixa tensão interfacial água/óleo e viscosidade moderada, de modo a melhorar a eficiência do petróleo varrido. Interações fluidos-rocha e óleo-rocha são determinantes no montante de óleo a ser recuperado, assim sendo, estudos com relação à molhabilidade das superfícies das rochas mostram-se fundamentais. Um método de análise largamente empregado e considerado como padrão para medidas de molhabilidade é o teste de Amott, porém, tal método apresenta grande tempo de análise e preparo de amostra. O presente trabalho analisa a molhabilidade de rochas utilizando-se a técnica de Ressonância Magnética Nuclear de Baixo Campo. Ela se baseia nos tempos de relaxação da magnetização das populações de água e óleo, livres ou ligadas na superfície da rocha, permitindo de maneira rápida, a determinação da quantidade de óleo removida. Nesse estudo foram analisadas amostras de arenito e carbonato, caracterizando-as comparativamente com relação ao tamanho e homogeneidade dos poros por dados de RMN. As rochas foram impregnadas com petróleo e deixadas em contato com diferentes soluções de surfactantes (não iônico e zwiteriônico), sendo possível a análise quanto à diferença de molhabilidade entre as mesmas. Com relação a essas soluções, foram utilizados diversos surfactantes, com diferenças quanto aos grupos funcionais, ao tamanho da cadeia hidrofóbica, a presença de uma ou duas dessas cadeias e em diferentes concentrações, sendo possível a obtenção de informações relacionadas à eficiência de extração de óleo para cada uma delas. Observou-se que a técnica utilizada apresentou excelentes resultados, permitindo diferenciar a capacidade de extração para cada solução estudada
Abstract: The study of solutions to enhance oil recovery has been widely used, mainly due to large amount of oil that remains in reservoirs after primary and secondary recoveries. Solutions with good potential to recovery must have some specific characteristics such as low water/oil interfacial tension and a moderate viscosity to improve the efficiency of the oil swept. The fluid-rock and oil-rock interactions are of great importance concerning the total oil recovered. Therefore, studies involving wettability of rock surfaces are essential. A traditional method of analysis, which is considered as standard to measures the wettability is the Amott test, however, this method spends too much time and sample preparation. This study analyzes rock wettability using the technique of Low Field Nuclear Magnetic Resonance (low-field NMR). This is based on the relaxation rates of the magnetization of water and/or oil molecules, free or bounded at the surface of the pores of the rock. The technique allows a quick determination of the amount of oil removed. In the present study, the size and pores homogeneity of sandstone and carbonate were analyzed using low field-NMR. The rocks were impregnated with oil and then left in contact with different solutions of surfactants (non-ionic and zwitterionic), being possible to analyze the differences in wettability among them. Several concentrations of surfactants, in which differences in their: functional groups, hydrophobic chain length and number of chains, were studied. The NMR technique revealed excellent results, providing information related to the efficiency of oil extraction for each studied solution
Mestrado
Físico-Química
Mestre em Química

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10

CRISENZA, TOMMASO ULISSE FILIPPO. "Thermoplastic elastomers from chlorinated polyethylene/nylon terpolyamide blends." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28398.

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Blends of chlorinated polyethylene (CPE) and Nylon terpolyamide (PA) were prepared with different ratios. It is generally known that CPE has intrinsic properties of heat, oil and oxidation resistance, so the obtained materials are well suitable in the hose, pipe and seal industry. CPE was strengthened by a 6,6-6,12 co-polyamide with the glass transition temperature slightly above room temperature and a particularly low melting temperature, that allowed to obtain the blends by typical industrial processes of mixing, milling and injection molding. Mechanical and rheological properties were investigated both with tensile tests and dynamic mechanical analysis: the results showed that CPE and PA form phase separated systems with excellent compatibility as the strength and modulus were improved. The thermal and mechanical behavior of the blends is that typical of thermoplastic elastomers. The comparison of the FTIR spectra of the blends in respect of linear combination of those of the component polymers allowed the detection of differences attributed to the existence of interactions at the interface responsible of the enhanced mechanical properties. These results were corroborated by time-domain proton NMR experiments, with an improved method for the measurement of the hard/soft ratio in phase separated systems. With the aim to resolve the morphology of the blends, samples were studied with laser scanning confocal fluorescent microscopy (LSCFM). CPE rubber was homogeneously labeled with a fluorescent dye by solution treatment and then blended with PA in order to increase the contrast between phases in fluorescent microscopy. Scanning Electron Microscopy and Atomic Force Microscopy techniques were used to confirm the data collected with LSCFM. A continuous and interpenetrating structure of the two phases is finally revealed for the blend with the best mechanical properties.Blends with co-continuous structures may combine the properties of both components in a favorable way. For example, a co-continuous structure leads to the maximum contribution of the mechanical modulus from each component simultaneously. Synergistic effects have also been shown in mechanical properties. Constituting a stable co-continuous morphology just mixing two polymers it is not that easy, and even more difficult is to detect such microstructure within the bulk of the material. For these two reasons, cocontinuous polymer blends are an interesting and challenging research topic. In addition, these co-continuous structures offer promising opportunities for improving properties and creating tailor-made materials. For these reason, and also as very few examples of Thermoplastic elastomers based on Chlorinated polyethylene and Nylon are present in the literature, the project for this thesis came to life. This work is aimed at the achievement of a material with thermoplastic elastomeric mechanical and processing properties, for which the structure properties relationships would be completely understood and explained as due to synergistic interfacial interaction between phases and cocontinuous morphology within them.

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11

Sankaran, Krishnaswamy. "Accurate domain truncation techniques for time-domain conformal methods /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17447.

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12

Benkler, Stefan. "Robust conformal subcell modeling for electromagnetic simulations in time domain /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16969.

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13

Weber, Benedikt. "Rational transmitting boundaries for time-domain analysis of dam-reservoir interaction /." Zürich : [s.n.], 1994. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10673.

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14

Feltrin, Glauco. "Absorbing boundaries for the time-domain analysis of dam-reservoir-foundation systems /." Basel ; Boston ; Berlin : Birkhäuser, 1997. http://e-collection.ethbib.ethz.ch/show?type=incoll&nr=808.

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15

Ernst, Jacques Robert. "2-D finite-difference time-domain full-waveform inversion of crosshole georadar data /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17105.

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16

Baumann, Dirk. "A 3-D numerical field solver based on the finite-volume time-domain method /." Zürich : ETH, 2006. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=16650.

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17

Schuster, Christian. "Simulation, analysis, and parameter extraction of electronic components and circuits using the finite difference time domain method /." Zürich, 1999. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=13522.

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18

Ferreira, Juliana Borges. "Simulações da SAR em virtude da exposição por tablets operados próximo à cabeça." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/143369.

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A grande maioria da população mundial está crescentemente exposta à radiação eletromagnética proveniente de fontes que muitas vezes estão localizadas nas proximidades do corpo. A radiação eletromagnética é considerada um agente possivelmente cancerígeno para as pessoas, classificação 2B indicada pela Organização Mundial da Saúde-OMS (WHO/IARC, 2011). Devido às preocupações em relação aos riscos associados a esta exposição existem normas que recomendam os valores máximos de exposição permitidos (ICNIRP, 1998; FCC, 2001). A correta avaliação das doses de radiação é, portanto, relevante. Este trabalho tem a finalidade de avaliar o impacto dos resultados do cálculo da dose da Taxa de Absorção Específica (SAR) em usuários expostos a radiação por tablets operando na faixa de radiocomunicações Wi-fi. Os três modelos existentes de cabeça humana utilizados serão um manequim homogêneo SAM phantom e dois modelos de cabeça realistas heterogêneos: um adulto masculino e uma criança masculina. Será também utilizado nas simulações um modelo masculino de criança que foi desenvolvido através de imagens de tomografia computadorizada (TC) pelo processo de segmentação feito no software AMIRA. Será utilizado um modelo genérico de tablet. Os parâmetros dosimétricos usados para simulação da SAR serão computados pelo software SEMCAD X que é baseado no Método das Diferenças Finitas no Domínio do Tempo (FDTD). Será criado também um código do Método FDTD através do software MATLAB que servirá para a escolha dos parâmetros do SEMCAD X. A distância entre o tablet e os modelos de cabeças varia de 50 mm a 300 mm. Os resultados da SAR serão comparados com os limites de exposição recomendados pelas normas internacionais. Também serão simuladas diferentes posições da antena no tablet. Da análise dos resultados foi constatado que os valores de SAR são muito baixos e todos os resultados ficaram dentro dos limites do psSAR recomendados pela FCC de 1,6 W/kg em cada 1 g de tecido e de 2 W/kg em cada 10 g de tecido estabelecidos pela ICNIRP. Comparando os valores de SAR do modelo SAM com o modelo DUKE, o modelo SAM se mostra conservador, porém quando a comparação é feita com as crianças o SAM deixa de ser conservador.
The vast majority of the world population is increasingly exposed to electromagnetic radiation from sources which are often located near to the body. Electromagnetic radiation is considered a possible carcinogen for people, classification 2B indicated by the World Health Organization-WHO (WHO/IARC, 2011). Due to concerns regarding the risks associated with this exposition there are regulations suggesting maximum allowed exposure values (ICNIRP, 1998; FCC, 2001). The correct evaluation of radiation doses is therefore relevant. This work aims to assess the impact of the results of the calculation of Specific Absorption Rate dose (SAR) in users exposed to radiation from tablets operating in the Wi-fi band. The three existing models of human head used are a homogeneous dummy SAM phantom and two heterogeneous realistic head models: a male adult and a male child. It will also be used in the simulations a male child model which was developed from computed tomography (CT) imaging using the AMIRA software for the segmentation process. A generic model of tablet is used. Dosimetric parameters used for simulation of the SAR are computed using the SEMCAD X software which is based on the Finite Difference Method in Time Domain (FDTD). A FDTD code was developed using the MATLAB software in order to help to choose the input SEMCAD X parameters. The distances between the tablet and the head of the models varies from 50 mm to 300 mm. SAR results are compared with the exposure limits recommended by international standards. Different antenna positions on the tablet are simulated too. Examining the results it was found that the SAR values are very low and all results are within the psSAR limits recommended by FCC (1,6 W/kg averaged over 1 g of tissue) and by ICNIRP (2 W/kg in 10 g of tissue). Comparing the SAR in the SAM model with the SAR in the DUKE model, the SAM model shows to be conservative. However, when compared with the children, the SAM is not conservative.

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19

Karlekar, Kirtish. "Design, Fabrication And Characterization Of Low-Scattering Transport Regime Tissue-Equivalent Phantom And Their Use In Time-Domain NIR Imaging." Thesis, 2004. http://etd.iisc.ernet.in/handle/2005/1212.

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20

"Voltage stability phenomenon analysis: transient and long term time domain simulation." Tese, MAXWELL, 1997. http://www.maxwell.lambda.ele.puc-rio.br/cgi-bin/db2www/PRG_0991.D2W/SHOW?Cont=8941:pt&Mat=&Sys=&Nr=&Fun=&CdLinPrg=pt.

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"Asymptotic formulations for time-domain scattering by conducting surfaces and application to the transient analysis of reflector antennas." Tese, MAXWELL, 2001. http://www.maxwell.lambda.ele.puc-rio.br/cgi-bin/db2www/PRG_0991.D2W/SHOW?Cont=1989:pt&Mat=&Sys=&Nr=&Fun=&CdLinPrg=pt.

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22

Mathejczyk, Julia Eva. "Innovative NIR fluorescent probes for an improved tumor detection in vivo." Doctoral thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-000D-EFAA-1.

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