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Dissertations / Theses on the topic 'Resonance and Steric Effects'

Author: Grafiati
Published: 5 June 2025
Last updated: 1 August 2025

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1

Liu, Sung Ying. "Steric effects in Lanthanide pyrazolylborate chemistry." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.561271.

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2

Massat, Alain. "Spectroscopie infra-rouge de cetones aliphatiques saturees : comportement associatif et analyse du massif nu(c=0) : apport a l'elucidation des effets de structure, de solvant et de conformation." Paris 7, 1987. http://www.theses.fr/1987PA077002.

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Un modele conformationnel est etabli pour une population de cetones aliphatiques saturees a partir des massifs nu (oh) de phenols associes aux cetones et des massifs nu (co) des cetones du splitting de ces massifs sont analyses: existance de deux complexes dimeres supposes n et pi; existence d'equilibres conformationnels; resonance de fermi
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3

McLachlan, Lorna J. "Steric and electronic effects on the structures of substituted silicon compounds." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/15345.

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This thesis is concerned with the application of the SARACEN method to a range of molecules with interesting structural properties and applications in industry. The gas-phase structures of a series of compounds have been obtained, combining gas-phase electron diffraction and <i>ab initio </i>molecular orbital theory. For each compound a series of the potential energy surface was carried out to investigate the number of conformational minima and to locate the global energy minimum. The gas-phase structures of <i>trans-</i>1,2-dichloro-1,2-disilylethene (1), 1,1-bromosilylethene (2) and 1,1,1,4,
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4

Bachir, Alexia. "Characterization of quantum dot blinking and steric effects on fluorescence-based biophysical techniques." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19293.

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Semiconductor nanoparticles, or quantum dots (QDs) are being increasingly applied as luminescent labels in optical studies for biophysical and cell biological applications due to their unique spectroscopic properties as compared to traditional organic fluorescent probes. However, the intermittency in the fluorescence emission of QDs, commonly referred to as 'blinking', is suggested to affect transport studies using fluctuation correlation techniques. The QD size has also been suggested to be sterically limiting for some st
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5

Laitinen, R. (Riitta). "New heterodonor phosphine and bipyridine ligands." Doctoral thesis, University of Oulu, 1999. http://urn.fi/urn:isbn:9514252292.

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Abstract Twenty-seven phosphine and six bipyridine ligands were synthesised and characterized. Additionally, a new route to the family of phosphine ligands via o-thioanisyldichlorophosphine was found. The phosphine ligands contain thiomethylphenyl, methoxyphenyl, dimethylaminophenyl, pyridyl, naphthyl and anthracenyl groups, and the bipyridine ligands thiomorpholine and piperidine groups. Metal complexes of 3-pyridyldiphenylphosphine, 6,6'-bis(methylthiomorpholine)-2,2'-bipyridine and 4,4'-dimethyl-6,6'-bis(methylthiomorpholine)-2,2'-bipyridine were prepared. Ligands and complexes were charac
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6

Smith, Adam C. R. "The Effects of Carrier Ligands on Cisplatin Binding to Cysteine and Methionine." TopSCHOLAR®, 2017. http://digitalcommons.wku.edu/theses/1969.

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We have reacted several derivatives of the anticancer drug cisplatin with N-acetyl-Lcysteine (N-AcCys) and N-acetyl-L-methionine (N-AcMet), which are two of the primary amino acid targets of platinum. NMR spectroscopy was used to monitor the reactions and determine the effect the different ligands would have on the platinum reactivity. Several of the platinum compounds were tested at pH of 4 and 7, and with platinum:amino acid ratios of 1:1, 2:1 and 1:2. Competition reactions between cysteine and methionine were done to confirm which would react with the platinum compound first. [Pt(dien)(NO3)
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7

Rowland, Keith E. (Keith Edward). "An NMR Investigation of Aryl Mercury Compounds." Thesis, North Texas State University, 1987. https://digital.library.unt.edu/ark:/67531/metadc500453/.

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A variable temperature ^13 C and ^199 Hg NMR study has been conducted for diphenyl-, bis(o-tolyl)-, bis(m-tolyl)-, and bis(2, 6-xylyl)mercury in dimethyl sulfoxide and 1,1,2,2 tetrachloroethane; ^13 C T1 relaxation times are reported as a function of temperature. Barriers to rotation of the aryl rings are obtained. Chemical shifts and couplings in CDCl_3 are given for bis(p-tolyl)-, bis(2, 5-xylyl)-, bis(mesityl)-,phenyl(o-tolyl)-, phenyl(m-tolyl)mercury, and the compounds listed above. The steric interactions of these aryl mercury compounds are discussed.
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8

Sethuraman, Swaminathan. "New measures and effects of stochastic resonance." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/2705.

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In the case of wideband (aperiodic) signals, the classical signal and noise measures used to characterize stochastic resonance do not work because their way of distinguishing signal from noise fails. In a study published earlier (L. B. Kish, 1996), a new way of measuring and identifying noise and aperiodic (wideband) signals during strongly nonlinear transfer was introduced. The method was based on using cross-spectra between the input and the output. According to the study, in the case of linear transfer and sinusoidal signals, the method gives the same results as the classical method and in
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9

Liau, Joy. "Baseline effects in functional magnetic resonance imaging." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3330237.

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Thesis (Ph. D.)--University of California, San Diego, 2008.<br>Title from first page of PDF file (viewed February 6, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 125-131).
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10

Kahan, Rachel Jennifer. "Investigating the steric and electronic effects of low-valent uranium complexes on the activation of small molecules." Thesis, University of Sussex, 2015. http://sro.sussex.ac.uk/id/eprint/54170/.

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In the last decade substantial progress has been made in our understanding of uranium organometallic chemistry, specifically regarding the activation of small molecules by uranium(III) complexes. Research by Cloke and colleagues has employed dianionic eight- and monoanionic five-membered aromatic ligands around a uranium(III) centre to make mixed-sandwich systems, which have demonstrated novel reactivity with carbon monoxide and carbon dioxide. This thesis continues this work and furthers our understanding of the properties and reactivity of these complexes. The first part of this thesis descr
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11

Ramirez-Huerta, Mayela Cristina. "Steric and Anchimeric Effects on the Hydrolysis of Oligoesters and their Influence on End-Use Polyurethane Coatings." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1258662846.

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12

Desai, Salil Dileep. "Ortho substitution effects on the acidic and alkaline hydrolyses of formanilides." Diss., University of Iowa, 2009. https://ir.uiowa.edu/etd/353.

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The objectives of this project were to determine the reaction schemes of formanilide and substituted formanilides in acidic and alkaline solutions, to quantiate the kinetics of hydrolysis, to propose reaction mechanisms, and to assess the role of ortho words substitution in formanilide hydrolysis kinetics. A set of thirty substituted formanilides were synthesized and characterized. Hydrolysis of the formanilides was carried out under first order conditions in hydrochloric acid (0.01-8 M, 40°C) and in hydroxide solutions (0.01-3 M, 25°C and 40°C). Hydrolysis kinetics were evaluated in terms of
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13

d'Avila, Ronald L. "Anharmonic effects on the resonance line shape of U-238 in UO[subscript]2." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/15703.

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14

Yang, Shaoguang. "Design and Investigation of Polyurethane End-Capped Polyesters with Controlled Hydrolytic Stability." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1407971721.

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15

Khayat, Mario. "An analysis of flow effects in magnetic resonance imaging /." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64018.

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16

PICCO, ANDREA. "Resonance effects in the Raman analysis of sige nanostructures." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28617.

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In the last two decades, attention has raised towards SiGe nanostructures for applications in microelectronics and optoelectronics. Many efforts have been payed in order to control the growth of the nanostructures and characterize their structural properties: for this purpose, a wide series of different experimental techniques have been developed. Raman spectroscopy of SiGe is commonly used to obtain information about the average values of composition and strain inside the nanostructures. Actually, due to the lack of data about the Raman efficiency of SiGe as a function of the alloy compositi
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17

Gutteridge, Sarah. "Imaging using long range dipolar field effects." Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251787.

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18

Woosley, Barry. "Directed ortho Metalation in Hydrocarbon Solvents: Opposing Pi-Resonance Effects." TopSCHOLAR®, 2004. http://digitalcommons.wku.edu/theses/539.

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Hydrocarbon solvents are known to be unreactive toward organolithium reagents and do not typically support ortho-metalation reactions without the aid of a promoter. An exception would be an arene substrate having the capability to bidentate complex to the reactive alkyllithium dimer, which enables ortho-metalation to occur in high yields. A second, more limiting exception, would be that the arene substrate possesses localized lone pairs of electrons, as is the case when the directed ortho metalating group (DMG) is located in the benzyl position. The work reported here centers upon developing a
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19

Oprea, Corneliu I. "Theoretical calculations of heavy atom effects in magnetic resonance spectroscopy." Licentiate thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3971.

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20

Baird, Michael David. "Effects of Product Prototypicality on Brand Resonance in Brand Extensions." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/863.

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This study investigates whether differing degrees of prototypical brands and brands that are either functional or symbolic in nature can undertake brand extensions, and if so, to what degree of congruency. The research uses a factorial design of 3 (congruency) x 2 (prototypicality) x 2 (motivation) x 2 (brand type) using four real brands. The study also creates a uni-dimensional prototypicality scale which is the first to provide a Likert type measure for prototypical brands.
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21

Companioni, Dania. "Targeting of ribonucleotide reductase with 2'-Disulfide analogs of adenosine. Electronic versus steric effects in radical deoxygenation of fluorine-containing nucleosides." FIU Digital Commons, 2002. http://digitalcommons.fiu.edu/etd/2417.

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Inhibition of the enzyme ribonucleotide reductase is an appealing concept for the rational drug design against rapid proliferation of systems such as viruses and cancer cells. Synthesis of 2'-thionucleoside analogs as possible inhibitors of the enzyme was targeted in this research. For protecting the reactive thiol group, mixed disulfides were prepared as precursors of the sulfur-containing nucleosides. The thionucleoside obtained are currently under biological studies. Fluorinated compounds are widely used in biochemistry, medicinal chemistry, and pharmacology. Synthesis of 2'-deoxy-2'-fluoro
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22

Ng, Yao Tsan. "Magnetic field effects in echo planar imaging at 3T." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262965.

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23

Braybrook, Julian Hugh. "Effects of paramagnetic and ferromagnetic particles on magnetic resonance (MR) imaging." Thesis, University of Cambridge, 1989. https://www.repository.cam.ac.uk/handle/1810/250949.

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24

Clayton, C. "Magnetic resonance as a probe of solvent effects in heterogeneous catalysis." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597760.

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The first experimental work discussed in this thesis is a series of reaction studies to look at the effect of four solvents - methanol, propan-1-ol, propan-2-ol and octanol - on the hydrogenation of 4-tertiary butyl phenol (TBP). Experiments are first done in a stirred pot-type reactor with two different sized catalyst particles and the rate and selectivity were compared. The same reaction was also performed in a small trickle bed reactor so that the effect of the reactor could be considered along with the effect of particle size and solvent. The next three areas of experimental work, use NMR
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25

Maxwell, R. J. "Nuclear magnetic resonance studies of drug metabolism and effects in vivo." Thesis, University College London (University of London), 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376471.

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26

Brookes, David Thomas. "The effects of resonance decays on particle ratios and momentum spectra." Master's thesis, University of Cape Town, 1997. http://hdl.handle.net/11427/17560.

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Includes bibliographical references and index.<br>A Hadron Gas model, including resonance decays, is used to predict momentum spectra and particle ratios. The model, including all significant two and three body resonance decays, is compared with transverse momentum spectra from the CERN-SPS NA44 Pbr Pb experiment and the implications of the fits are discussed. It is shown that resonance decays fail to explain the low mT anomaly in the pion transverse momentum spectrum. The effects of resonance decays are then considered in the calculation of various particle ratios. The width of the rapidity w
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27

Urban, Jeffry Todd. "Nuclear magnetic resonance studies of quadrupolar nuclei and dipolar field effects." Berkeley, Calif. : Oak Ridge, Tenn. : Lawrence Berkeley National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/836811-joXo6p/native/.

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Thesis (Ph.D.); Submitted to the University of California, Berkeley, CA (US); 21 Dec 2004.<br>Published through the Information Bridge: DOE Scientific and Technical Information. "LBNL--56768" Urban, Jeffry Todd. USDOE Director. Office of Science. Office of Basic Energy Sciences (US) 12/21/2004. Report is also available in paper and microfiche from NTIS.
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28

Cavin, I. D. "Investigating the biological effects of MRI magnetic fields." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490976.

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This thesis addresses the much needed quantitative assessment of the physiological effects the magnetic fields used in MRI. MRI has a well-earned reputation for being a safe, non-ionising alternative imaging modality for both the patient and MR practioner alike. Although the operating environment can prove hazardous for inexperienced and untrained personnel, appropriate training and adoption of safe working practices can prevent adverse incidents.
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29

Eagan, Robert Lee. "Investigation of the steric and/or electronic effects associated with the (1,5)-sigmatropic rearrangement of 1-substituted-2,3,4,5-tetraphenyl- 2,4-cyclopentadien-1-ols." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/74730.

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A series of eight l-substituted-2,3,4,5-tetraphenyl-2,4-cyclopentadien-l-ols were efficiently synthesized by the addition of the appropriate organometallic reagent to tetracyclone. It was determined that the steric and electronic nature of the migrating groups played a predictable role in the [l,5]-sigmatropic rearrangement of these compounds. Electron donating groups increased the rate of migration whereas electron withdrawing substituents were responsible for slowing the migration. Likewise, smaller groups accelerated the rate while bulky groups deterred the migration. Consequently, the expe
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30

Assländer, Jakob [Verfasser]. "Static Field Inhomogeneities in Magnetic Resonance Encephalography: Effects and Mitigation / Jakob Assländer." München : Verlag Dr. Hut, 2014. http://d-nb.info/1063221269/34.

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31

SCRIBANTE, ANDREA. "EFFECTS OF MAGNETIC RESONANCE ON TEMPERATURE AND ADHESION EFFICACY OF ORTHODONTIC DEVICES." Doctoral thesis, Università degli studi di Pavia, 2021. http://hdl.handle.net/11571/1422618.

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Magnetic resonance (MRI) is a widely used diagnostic technique. Often, patients wearing orthodontic appliances are requested to remove appliance even when the MRI exam involves anatomic areas far from mouth, in order to avoid metal heating and appliance detachment. The purpose of the present investigation was to measure and compare temperature changes and adhesion to enamel of orthodontic appliances after different MRIs. 220 orthodontic bracket were bonded on bovine incisors and wires with different materials (stainless steel and nickel titanium) and sizes (0.014’’ and 0.019’’x0.025’’) were en
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32

Tanna, Jigisha. "ANTI Preference of the Pyramidalized Radical Center to the Two Fluorines in Difluoro Cyclic Compounds." Thesis, University of North Texas, 2008. https://digital.library.unt.edu/ark:/67531/metadc6047/.

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An extensive study of disubstituted cycloalkanes like CnH2n where n=3,4,5 and 6 using DFT((U)B3LYP/6-31G(d) and 6-311+G(2df,2p)) calculations is presented focusing on the effect of pyramidalization of the radical center. A potential energy surface (PES) analysis shows that the radical prefers to pyramidalize anti to the two cis fluorines in the disubstituted cycloalkanes. The degree of pyramidalization for 1,2-difluorocyclopropyl radical is 43.9o away from the cis fluorines whereas for 1,3-difluorocyclobutyl radical, 1,3-difluorocyclopentyl radical and 1,3-difluorocyclohexyl radical is 3.8o, 5
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33

Skutt, Glenn R. "High-Frequency Dimensional Effects in Ferrite-Core Magnetic Devices." Diss., Virginia Tech, 1996. http://hdl.handle.net/10919/30596.

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MnZn ferrites are widely used in power electronics applications where the switching frequency is in the range of several tens of kilohertz to a megahertz. In this range of frequencies the combination of relatively high permeability and relatively low conductivity found in MnZn ferrite helps to minimize the size of magnetic devices while maintaining high efficiency. The continuing improvement in semiconductor switches and circuit topologies has led to use of high-frequency switching circuits at ever increasing power levels. The magnetic devices for these high-power, high-frequency circuits re
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34

Li, Lilong, and Songhua Chen. "Incorporating internal gradient and restricted diffusion effects in Nuclear Magnetic Resonance log interpretation." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-186342.

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It is shown that internal gradient combined with the restricted diffusion effect can significantly influence the D-T2 cross plots, which are widely used for fluid typing in Nuclear Magnetic Resonance (NMR) well-logging applications. By using models that capture the most important features of the internal gradient in the sedimentary rocks, such effects can be accounted for in the D-T2 inversion process, making fluid typing more accurate.
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Li, Lilong, and Songhua Chen. "Incorporating internal gradient and restricted diffusion effects in Nuclear Magnetic Resonance log interpretation." Diffusion fundamentals 14 (2010) 4, S. 1-5, 2010. https://ul.qucosa.de/id/qucosa%3A13850.

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It is shown that internal gradient combined with the restricted diffusion effect can significantly influence the D-T2 cross plots, which are widely used for fluid typing in Nuclear Magnetic Resonance (NMR) well-logging applications. By using models that capture the most important features of the internal gradient in the sedimentary rocks, such effects can be accounted for in the D-T2 inversion process, making fluid typing more accurate.
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36

Truong, Trong-Kha. "Susceptibility effects in ultra-high field magnetic resonance imaging of the human brain." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1093830567.

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37

Sella, Sabrina. "In vitro analysis of Quantum Molecular Resonance effects on human mesenchymal stromal cells." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3425307.

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Effects of high frequency electromagnetic fields and electric currents on biological systems, in particular concerning stem cells, are not extensively studied. Medical devices based on Quantum Molecular Resonance (QMR) technology are actually used in clinical practice for the treatment of musculoskeletal disorders and post-surgical articulation conditions. QMR is a new technology based on the quantum theory and assumes that a quantum value of energy exists for breaking every type of molecular bond without any increase of temperature. QMR produces waves at high frequencies (4-64 MHz) and low in
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38

Eveson, Robert W. "Geminate free radical processes and magnetic field effects." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325978.

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39

Beveridge, Madeleine Edith Louisa. "Motor activation in language processing : effects of handedness, experience, and planning." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9875.

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Embodied Cognition accounts propose that motor activation contributes to semantic representations in action language (Fischer & Zwaan, 2008). However, the nature of this activation remains largely unspecified: in particular, which processes result in relevant activation? Long-term motor experience (e.g., the comprehender’s dominant hand), short-term motor experience (e.g., the hand the comprehender has recently used), and action planning (e.g., the hand the comprehender is planning to use) are all potential candidates. This thesis uses a range of psycholinguistic methods (e.g., timed sentence-
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40

Trusca, Ovidiu Cezar. "Interaction Effects in Nickel Nanowires Arrays." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/696.

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Systems of magnetic nanowires are considered strong candidates in many technological applications as microwave filters, sensors or devices for data storage. Because of their strong potential as candidates in such applications they became lately the object of many studies. However, due to the very complicated nature of the interwire interactions, their magnetic behavior is very difficult to be interpreted. The main parameter controlling the response of magnetic nanowires assemblies is the aspect ratio of the nanowires that is defined as the ratio of the length to the wire's diameter. In o
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41

Taguchi, Hiroomi. "Studies on PNP-Pincer Type Phosphaalkene Complexes Stabilized by a Fused-Ring Bulky Protection Group." Kyoto University, 2018. http://hdl.handle.net/2433/232481.

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42

Dorcéna, Cassandre Jenny. "Effects of Metallic Nanoalloys on Dye Fluorescence." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/35057.

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Metallic nanoparticles (NPs) are exploited for their ability to interact with organic compounds and to increase significantly the fluorescence intensity and the photostability of many fluorescent dye molecules. Metal enhanced fluorescence (MEF) is therefore widely investigated for biosensing applications. When used in immunoassays, silver island films (SIFs) could augment the fluorescence intensity of fluorescein by a factor of seventeen; SIFs were also able to double or triple the emission intensity of cyanine dyes which are commonly used in (deoxyribonucleic acid) DNA microarrays. The emissi
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43

Ronan, Leah L. "An NMR investigation of pore size and paramagnetic effects in synthetic sandstones." University of Western Australia. School of Oil and Gas Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0198.

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[Truncated abstract] This thesis describes the development of synthetic rock samples, representative of core samples from hydrocarbon reservoirs. The basic process consists of screening and sorting silica particles into discrete grain sizes, and then binding them together using a proprietary process known as CIPS, (Calcite In-situ Precipitation System). In the bonding process, the porosity of the system is substantially preserved, and the technique allows the manufacture of synthetic core samples with a tailor-made permeability. The produced samples were extensively characterised using a varie
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44

Sekar, Sakthivel. "Investigation of Neuronal Effects of Anxiogenic and Antidepressant Medications using Pharmacological Magnetic Resonance Imaging." Thesis, University of Newcastle Upon Tyne, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519474.

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45

Kranert, Christian. "Investigation of wide-bandgap semiconductors by UV Raman spectroscopy: resonance effects and material characterization." Doctoral thesis, Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-160062.

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Die vorliegende Arbeit befasst sich mit der Untersuchung von weitbandlückigen Halbleitern mittels Raman-Spektroskopie. Diese wurde vorwiegend unter Verwendung von Licht einer Wellenlänge von 325 nm im ultravioletten Spektralbereich angeregt. Damit konnten zum einen aufgrund eines erhöhten Streuquerschnittes Messungen zur Probencharakterisierung durchgeführt werden, die mit Anregung im sichtbaren Spektralbereich nicht möglich gewesen wären. Zum anderen wurden bei dieser Anregungswellenlänge auftretende Resonanzeffekte untersucht. Dabei werden zwei verschiedene Materialsysteme behandelt: zum ein
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46

Jayasundar, Rama. "Magnetic resonance studies in oncology : measurement of the effects of hyperthermia on tumour pH." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335171.

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47

Richert, Sabine. "Electron paramagnetic resonance studies and magnetic field effects on porphyrin nanostructures and triad systems." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:9575a056-1a68-4f26-a970-4ad8d0d17c4f.

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The studies presented in this thesis deal with the investigation of inter- and intramolecular interactions in porphyrin nanostructures and molecular triad systems using a variety of different electron paramagnetic resonance (EPR) based techniques as well as optical spectroscopy. Dipolar and exchange couplings were investigated in a range of linear and cyclic copper-containing porphyrin nanostructures by continuous wave (cw) and pulse EPR. The magnitude of the exchange interaction, J, and trends in this property could be determined by numerical simulations of the cw EPR spectra or pulse dipolar
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48

Russell, Gregory. "Understanding the Effects of Diffusion and Relaxation in Magnetic Resonance Imaging using Computational Modeling." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/333215.

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The work described in this dissertation was motivated by a desire to better understand the cellular pathology of ischemic stroke. Two of the three bodies of research presented herein address and issue directly related to the investigation of ischemic stroke through the use of diffusion weighted magnetic resonance imaging (DWMRI) methods. The first topic concerns the development of a computationally efficient finite difference method, designed to evaluate the impact of microscopic tissue properties on the formation of DWMRI signal. For the second body of work, the effect of changing the intrins
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49

Cabañas, Francisco Xavier. "A study of level crossing effects in TCNQ salts." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28632.

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ESR results for DEM(TCNQ)₂ and for MEM(TCNQ)₂ are presented as examples of TCNQ salts with and without level crossing effects. In the case of DEM(TCNQ)₂ we are performing ESR on a system with two types of spins. The latter are due to the two kinds of stacks of the acceptor TCNQ molecules in DEM(TCNQ)₂. The level crossing occurs when the g value of these two kinds of electrons are the same. This is compared to the case of MEM(TCNQ)₂ where there is only one kind of TCNQ stack and consequently no level crossing effect. It is found that g values and susceptibilities of the ESR spectra for DEM(TCNQ
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50

McCreary, Kacey. "Transient Radicals Produced by Sonication and the Investigation of Paramagnetic Effects." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/45147.

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Ultrasound can be used to create free radicals by growth and collapse of cavitation bubbles. These free radicals have potential use in various fields. The formation of free radicals can be monitored by decrease in T1 during NMR experiments due to paramagnetic effects. Our goal is to develop a method in which ultrasound is used to enhance NMR. By irradiating the sample during analytical measurements, we can decrease T1 which can be used as a non-toxic contrast agent1 producing hydroxyl radicals from the water in the body, invoke NMR enhancement using dynamic nuclear polarization2, control a
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