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Dissertations / Theses on the topic 'Nuclear Quadrupole Resonance (NQR)'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Segiňák, Ján. "Optimalizace pokusného NQR spektrometru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-318168.

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The thesis deals with the NQR spectroscopy, which is one of the modern non-destructive measurement and diagnostic methods for the characterization of various materials. It is using a quadrupole moment - a property of atomic nuclei of certain isotopes. A method of nuclear quadrupole resonance (NQR) is in principle very similar to nuclear magnetic resonance (NMR). Thesis in the theoretical part analyse the principles of NMR and NQR, describes the possible use of this method to detect for example explosives, drugs, and other chemicals. In the following chapters are analysed the key parameters of

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2

Li, Xiaohua. "NMR of group 2 element quadrupolar nuclei and some applications in materials science and biology." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/30998.

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3

Motyčka, Lukáš. "Radiofrekvenční metoda detekce výbušnin a drog - NQR." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219982.

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The thesis deals with RF spectroscopic methods, which are applicable for the detection of hazardous substances such as explosives or drugs. Particular attention is focused on promising method of nuclear quadrupole resonance. Abroad this method has recently been applied in the detection of energetic materials in hazardous locations. The cornerstone of the nuclear quadrupole resonance is to evaluate the interaction between electromagnetic radiation, in the range of medium to very short waves, and the researched substance. Observed parameter are the resonant frequencies of the substance. Spectral

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4

Procházka, Michal. "NQR spektroskopie - návrh metod měření." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219990.

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Nuclear quadropole spectroscopy is a modern analytical method for detecting specific solid state materials, e.g. explosives, drugs etc. It uses phenomenon of atomic nucleus called nuclear quadrupole moment. NQR method is very similar to common nuclear magnetic resonance (NMR) that is why major principles are explained using NMR. The thesis deals with basic principle of NQR, its usage for explosives detection and also detection of other chemical compounds and many other useful applications. The thesis deals with specific circuit design, techniques for sufficient sensitivity, impedance matching

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5

Pratt, Devin Baker. "Array Analysis of Radio Frequency Interference Cancelation Requirements for a Land Mine Detection System." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1090.pdf.

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6

Ashbrook, Sharon Elizabeth. "New NMR techniques for the study of quadrupolar nuclei." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342238.

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7

Manninen, P. (Pekka). "Breit-Pauli Hamiltonian and Molecular Magnetic Resonance Properties." Doctoral thesis, University of Oulu, 2004. http://urn.fi/urn:isbn:9514274318.

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Abstract In this thesis, the theory of static magnetic resonance spectral parameters of nuclear magnetic resonance (NMR) and electron spin resonance (ESR) spectroscopy is investigated in terms of the molecular Breit-Pauli Hamiltonian, which is obtained from the relativistic Dirac equation via the Foldy-Wouthuysen transformation. A leading-order perturbational relativistic theory of NMR nuclear shielding and spin-spin coupling tensors, and ESR electronic g-tensor, is presented. In addition, the possibility of external magnetic-field dependency of NMR parameters is discussed. Various first-prin

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8

Trepanier, Roland J. "14N nuclear quadrupole resonance investigations." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74551.

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The interaction between non-spherical nuclear charge distribution and the electric field gradient is described. Expressions for the energy levels (I = 1), the nuclear quadrupolar resonance, NQR, transition frequencies and line shape are derived. The general equations to obtain the inverse line width parameter, T$ sb2 sp star,$ from the self-quenched super-regenerative oscillator, SRO, NQR spectra are derived and tested.<br>The construction and operation of the $ sp{14}$N Sullivan and Dean SRO spectrometers are described. Limits in the sensitivity of the SRO to yield T$ sb2 sp star$ data are di

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9

Kyriakidou, Georgia. "Medicines authentication using nuclear quadrupole resonance." Thesis, King's College London (University of London), 2016. https://kclpure.kcl.ac.uk/portal/en/theses/medicine-authentication-using-nuclear-quadrulope-resonance(793151c5-1939-4891-af01-f493cb48d846).html.

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Nuclear Quadrupole Resonance (NQR) is a radio-frequency (RF) spectroscopic technique, that allows the detection of solid-state compounds containing quadrupolar nuclei; a property of the majority of pharmaceutical products. This thesis investigates the application of NQR in medicines authentication, where accurate \ fingerprints" of the examined materials must be obtained, in response to the global threat of low quality and counterfeit medicines. In practice, a complete NQR system contains a database with profiles of commercial medicines, built using characteristic features of the NQR signals.

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10

Kerkour, Abdelaziz. "Study of DNA G-quadruplex structures by Nuclear Magnetic Resonance (NMR)." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0292/document.

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Les G-quadruplexes (G4) sont des structures d'acides nucléiques non-canoniques formées par des séquences riches en Guanines (G) principalement localisées dans les telomères et les régions promotrices des oncogènes. Elles sont constituées de l'empilement de plusieurs tétrades de G en présence de cations. En utilisant la spectroscopie par RMN, nous avons caractérisé l'interaction entre le ligand TAP et le G4 télomérique humain constituée de la séquence d(AG3(T2AG3)3). CD et RMN 1D 1H ont été utilisés pour suivre l'interaction entre les deux partenaires. RMN 2D a été utilisé pour attribuer sans a

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11

Koukoulas, Alexander Anthony. "Investigations in pulsed nuclear quadrupole resonance spectroscopy." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=74278.

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The theoretical and experimental aspects of Nuclear Quadrupole Resonance (NQR) spectroscopy are examined with respect to instrumentation and experimental methodology. The interaction of the quadrupolar moment with the electric field gradient is derived from first principles and extended to include transient experiments. The response of the nuclear magnetization to a single pulse for a spin I = 3/2 system, assuming zero asymmetry, is calculated exactly under the Bloom, Hahn and Herzog model and applied to the NQR spin-lattice (T$ sb1$) relaxation in polycrystalline solids.<br>The theory and use

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12

Colaux, Henri. "Investigating sensitivity improvement methods for quadrupolar nuclei in solid-state nuclear magnetic resonance." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/9628.

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The study of quadrupolar nuclei using NMR spectroscopy in the solid state significantly increased in popularity from the end of the 20th century, with the introduction of specific methods to acquire spectra free from the effects of the quadrupolar interaction, that results in broadened lineshapes that cannot be completely removed by spinning the sample at the magic angle (MAS), unlike most of the other interactions present in the solid state. The first technique which allows, without any specific hardware, the removal of this broadening has been the Multiple-Quantum MQMAS experiment. The metho

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13

Krishnan, Mangala Sunder. "Applications of irreducible spherical tensor operators to NMR and NQR spectroscopy." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75771.

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The thesis extends the concept of Irreducible Spherical Tensor Operators to spin dynamics problems in Nuclear Magnetic and Quadrupole Resonance Spectroscopy. NQR and solid state NMR deal with spin systems which behave as effective single spins in many, pulsed experiments, or as multispin systems when the dipolar interactions among spins cannot be neglected. The thesis considers problems in both areas. New analytic results are derived in the thesis for pure NQR spectroscopy and for the effect of radiofrequency fields in the presence of electric quadrupolar interaction. Three-pulse experiments a

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14

Glickstein, Jarred S. "Automated Polarisation Enhanced Broadband Nuclear Quadrupole Resonance Spectroscopy." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1513081362905414.

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15

Burgess, Kevin. "Solid-State Nuclear Magnetic Resonance of Exotic Quadrupolar Nuclei as a Direct Probe of Molecular Structure in Organic Ionic Solids." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/31971.

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In the past decade, the field of NMR spectroscopy has seen the emergence of ever more powerful superconducting magnets, which has opened the door for the observation of many traditionally challenging or non-receptive nuclei. In this dissertation, a variety of ionic solids with organic coordination environments are investigated using quadrupolar solid-state NMR experiments with an ultrahigh-field magnet (21.1 T). Two general research directions are presented including a 79/81Br solid-state NMR study of a series of 6 triphenylphosphonium bromides for which single-crystal X-ray structures are r

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16

Rudisch, Christian. "Nuclear Magnetic Resonance on Selected Lithium Based Compounds." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-130485.

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This thesis presents the NMR measurements on the single crystals LiMnPO4 and Li0.9FeAs. Therefore, the thesis is divided into two separated sections. The ﬁrst part reports on the competitive next generation cathode material LiMnPO4 with a stable reversible capacity up to 145 mAh/g and a rather ﬂat discharge voltage curve at 4.1 V. For the basic understanding of the material the magnetic properties have been investigated by a Li and P NMR study in the paramagnetic and antiferromagnetic phase. LiMnPO4 shows a strong anisotropy of the dipolar hyperﬁne coupling due to the strong local magnetic mom

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17

Tate, Elizabeth Alice Kate. "The application of nuclear quadrupole resonance to pharmaceutical analysis." Thesis, King's College London (University of London), 2007. https://kclpure.kcl.ac.uk/portal/en/theses/the-application-of-nuclear-quadrupole-resonance-to-pharmaceutical-analysis(c0402395-842a-4700-a0ac-42f498f7f25a).html.

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Research was conducted using nuclear quadrupole resonance (NQR) to investigate its potential application to pharmaceutical analysis. 14-nitrogen and 35-chlorine quadrupole resonance frequencies between 1 and 37 MHz have been established and characterised for a number of materials of pharmaceutical and chemical interest with a view to applying the technique of NQR to pharmaceutical analysis, possibly on an industrial scale. Background information and the theory of nuclear quadrupole resonance are discussed, together with the experimental hardware used, personal instrumental modifications made,

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18

Kitagawa, Shunsaku. "Nuclear Magnetic Resonance/ Nuclear Quadrupole Resonance studies of two dimensional layered compounds with the "1111" structure." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/175102.

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19

Zhang, Guowang John 1956. "Magnetic resonance imaging via radio frequency gradient with examples from NMR and pure NQR." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50496.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1998.<br>Includes bibliographical references (leaves 160-164).<br>In this thesis, we explore the use of RF gradients in NMR imaging. RF gradients have advantages over gradients of the static magnetic field in that they are non-secular and offer more experimental freedom (for example they permit amplitude, phase and frequency variations). In the case of pure NQR imaging, RF gradients preserve an undistorted line-shape. RF gradients also present significant new challenges in both the probe design and the spin dy

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20

Labouze, Xavier. "Etude par résonances nucléaires des propriétés magnétiques des cuprates supraconducteurs dans leurs phases isolantes." Grenoble 1, 1994. http://www.theses.fr/1994GRE10042.

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Cette these porte sur l'etude des proprietes magnetiques des cuprates supraconducteurs dans leurs phases isolantes. Les techniques experimentales utilisees sont la resonance nucleaire, magnetique (rmn) et quadrupolaire (rqn). La premiere partie presente une revue des proprietes essentielles des cuprates supraconducteurs. La deuxieme explique particulierement comment utiliser la rqn. L'etude des composes au plomb type ybco (partie iii) montre que le magnetisme des cuprates doit etre quasi-2d quasi-heisenberg. La partie iv traite des composes ybco substitues au calcium. L'etude statique par mesu

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21

Silva, Marcos Antonio da. "Estudo de compostos LiMePO4 (Me=Mg, Co, Ni) através de Ressonância Magnética Nuclear." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-13032014-112117/.

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Nesta dissertação é apresentado um estudo dos compostos Li1-3xMgFexPO4 através de Ressonância Magnética Nuclear (7Li e 31P), no intervalo de temperatura de 150 a 410 K. Estudos desses compostos através de técnicas de difração de elétrons e efeito Mossbauer confirmam que os íons Fe entram na rede cristalina na forma Fe3+, substituindo os íons Li+. O comportamento dos espectros de RMN, dos tempos de relaxação spin-rede e da susceptibilidade magnética dos núcleos 7Li e 31P em função da temperatura, em conjunto com medidas de condutividade iônica, indicam que, mesmo com a adição de impurezas Fe3+

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22

Rabbani, S. R. "Nuclear Quadrupole Double Resonance : Investigations in heterogeneous samples and biological compounds." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371561.

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23

Payne, Nicholas Roy. "Quadrupolar relaxation-based methods in fast field-cycling MRI." Thesis, University of Aberdeen, 2019. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=240235.

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Quadrupolar relaxation-based methods in Fast Field-Cycling MRI Nicholas R. Payne Aberdeen Biomedical Imaging Centre, University of Aberdeen, AB25 2ZD, Scotland, UK Fast Field-Cycling MRI (FFC-MRI) can access contrast based on the dependence of a sample's relaxation rate to the applied magnetic field strength. This technique can provide signal based on interactions with local quadrupolar nuclei through cross-relaxation, however, there are other so-called Nuclear Quadrupole Double Resonance (NQDR) techniques described in the literature. This work has been centred on efforts to apply these techni

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24

Widdifield, Cory. "Multinuclear Solid-State Magnetic Resonance Studies on ‘Exotic’ Quadrupolar Nuclei: Acquisition Methods, High-Order Effects, Quantum Chemical Computations, and NMR Crystallography." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20722.

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This dissertation attempts to extend the classes of halogen-containing systems which may be studied using solid-state nuclear magnetic resonance (SSNMR). As line shape broadening due to the quadrupolar interaction (QI) scales inversely with the applied field, high-field magnet technology is indispensable for this research. Combining advanced radiofrequency pulse sequences with high-field wideline data acquisition allowed for the collection of very broad SSNMR signals of all quadrupolar halogen nuclei (i.e., 35/37Cl, 79/81Br and 127I) within a reasonable amount of experimental time. The init

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25

Gosling, P. "Nuclear quadrupole double resonance : Detection of low frequency quadrupolar nuclei using fluorine and hydrogen." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375258.

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26

Mukherjee, Shrijit. "Broadband electric field sensing and its application to material characterisation and nuclear quadrupole resonance." Thesis, University of Sussex, 2012. http://sro.sussex.ac.uk/id/eprint/7666/.

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The aim of this project is to address the challenges associated with extending the radio frequency capability of Electric Potential Sensors to greater than 10 MHz. This has culminated in a single broadband sensor, with a frequency range of 200 Hz to greater than 200 MHz. The use of Electric Potential Sensors for the measurement of electric field with minimal perturbation has already been demonstrated at Sussex. These high impedance sensors have been successfully employed in measuring signals with frequencies in the range 1 mHz to 2 MHz. Many different versions of these sensors have been produc

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27

Poulin, Neal M. "Deuterium nuclear magnetic resonance in model membrane systems : an investigation of the interaction of a synthetic, amphiphilic polypeptide with charged lipids." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24898.

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The theory of the quadrupole interaction in nuclear magnetic resonance spectroscopy and relaxation measurements is presented in detail, with applications to ²H-NMR studies of order and dynamics in bilayers of deuterated lipids. Investigations of lipid-protein interactions in reconstituted membrane systems and intact biological membranes are reviewed. An experimental program is described which uses a synthetic amphiphilic polypeptide, with known geometry and variable length, to isolate questions about the geometrical interpretation of orientational order in lipid-protein interactions. A report

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28

Dong, Sunny Ronald. "The investigation of indium halides and graphite intercalation compounds using time-differential perturbed angular correlation gamma-ray spectrosocopy." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28375.

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This thesis discusses in general terms the theory and application of time-differential perturbed angular correlation gamma-ray spectroscopy (TDPAC) to the study of solid state physics. The technique yields valuable information on the electric field gradients experienced by radionuclides which have been substituted for nonradioactive isotopes or inserted as impurities into various inorganic compounds. The indium halides are examined in a series of experiments. The first applications of this technique to the study of graphite intercalation compounds are discussed.<br>Science, Faculty of<br>Physi

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29

Grevin, Benjamin. "Étude par RMN de la dynamique de charge et de la localisation des porteurs dans les cuprates TRBa2Cu3O7 (TR=Pr, Y) : influence des milieux intercalaires." Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10095.

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Ce memoire est consacre a l'etude par rmn et rqn des couches <single high-reversed-9 quotation mark>intercalaires<right single quotation mark> dans les supraconducteurs de la famille trba#2cu#3o#6# #+# # (tr pour terre-rare). Les resultats presentes portent sur la rqn/rmn du site cu(1) des chaines, dans l'isolant prba#2cu#3o#y##7, et le supraconducteur surdope yba#2cu#3o#y##7, et demontrent l'importance des fluctuations de charge dans les plans intercalaires. Dans prba#2cu#3o#7 l'analyse des parametres rmn/rqn statiques et dynamiques entre 300k et 4. 2k revele une transition dans les excitatio

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30

Viger-Gravel, Jasmine. "Characterization of Halogen Bonds with Multinuclear Magnetic Resonance in the Solid-State, X-ray Crystallography, and Quantum Chemical Calculations." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32851.

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Solid-state nuclear magnetic resonance (SSNMR) has proven to be a useful tool in the characterization of non-covalent interactions such as hydrogen bonding and cation-π interactions. In recent years, the scientific community has manifested a renewed interest towards an important class of non-covalent interaction, halogen bonding (XB), as it has applications in various fields such as crystal engineering and biological processes. This dissertation demonstrates that NMR parameters measured in the solid state are sensitive to changes in electronic structure, which are caused by halogen bonds.

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31

Walder, Brennan J. "Separating, correlating, and exploiting anisotropic lineshapes for NMR structure determination in solids." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429846088.

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32

Aissani, Sarra. "Résonance quadrupolaire de l'azote-14 : amélioration de la qualité spectrale et effet d'un champ magnétique statique de faible amplitude." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0069/document.

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La Résonance Quadrupolaire Nucléaire (RQN) est une technique spectroscopique appliquée à l’état solide et qui ne nécessite aucun champ magnétique statique contrairement à la Résonance Magnétique Nucléaire (RMN). Elle permet de détecter, les molécules qui contiennent un noyau quadrupolaire (tel que l'azote-14). La RQN de l’azote-14 suscite un intérêt particulier car elle s'avère utile dans la détection de drogues et d’explosifs, qui contiennent, pour la plupart, des molécules azotées. Cette thèse porte en premier lieu sur l’amélioration de la qualité spectrale en résonance quadrupolaire (RQN) d

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33

Naidja, Houda. "Etude microscopique de systèmes fermioniques finis : corrélations dans les noyaux atomiques et gaz d'électrons confinés par un potentiel harmonique en présence d'un champ magnétique." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2009. http://tel.archives-ouvertes.fr/tel-00404558.

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Dans le cadre d'une approche Higher Tamm Dancoff Approximation notée HTDA, nous avons étudié les corrélations vibrationnelles de type quadrupole, avec et sans appariement. Le champ moyen a été déterminé dans le cadre d'une approche microscopique utilisant l'interaction effective de Skyrme. Une interaction résiduelle schématique de type delta plus quadrupole-quadrupole, tenant compte en particulier de l'appariement neutron-proton T=0 et T=1 a été utilisé. Les résultats obtenus pour la résonance géante quadrupolaire isoscalaire du noyau Ca40 ont été comparés aux données expérimentales et à d'aut

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34

Naïdja, Houda. "Etude microscopique de systèmes fermioniques finis : corrélations dans les noyaux atomiques et gaz d'électrons confinés par un potentiel harmonique en présence d'un champ magnétique." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13762/document.

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Dans le cadre d'une approche Higher Tamm Dancoff Approximation notée HTDA, nous avons étudié les corrélations vibrationnelles de type quadrupole, avec et sans appariement. Le champ moyen a été déterminé dans le cadre d'une approche microscopique utilisant l'interaction effective de Skyrme. Une interaction résiduelle schématique de type delta plus quadrupole-quadrupole, tenant compte en particulier de l'appariement neutron-proton T=0 et T=1 a été utilisé. Les résultats obtenus pour la résonance géante quadrupolaire isoscalaire du noyau Ca40 ont été comparés aux données expérimentales et à d'aut

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35

Amdjadi, Mohammed Hossein Ala. "Nuclear Quadrupole Resonance And Relaxation Studies In Chloropyridines And High Pressure Studies In Chlorates." Thesis, 1997. https://etd.iisc.ac.in/handle/2005/1835.

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Amdjadi, Mohammed Hossein Ala. "Nuclear Quadrupole Resonance And Relaxation Studies In Chloropyridines And High Pressure Studies In Chlorates." Thesis, 1997. http://etd.iisc.ernet.in/handle/2005/1835.

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37

Domínguez, Gabriela Alejandra. "Caracterización por Resonancia Cuadrupolar Nuclear de diversos polimorfos de la Clorpropamida." Bachelor's thesis, 2011. http://hdl.handle.net/11086/66.

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Tesis (Lic. en Física)--Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física, 2011.<br>La caracterización de los compuestos sólidos juega un rol fundamental tanto en el área de la física como de la química. En particular, en la industria farmacéutica resulta sumamente importante el conocimiento exhaustivo de los diferentes ordenamientos que puede adquirir una molécula al variar ciertos parámetros externos, como la temperatura. En trabajos recientes se ha mostrado comprobado la factibilidad de utilizar la Resonancia Cuadrupolar Nuclear como una técnica muy sensible para

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Cerioni, Lucas Matías Ceferino. "Técnicas para aplicaciones que presentan baja sensibilidad y ensanchamiento inhomogéneo en Resonancia Cuadrupolar Nuclear /." Doctoral thesis, 2009. http://hdl.handle.net/11086/134.

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Tesis (Doctor en Física)--Universidad Nacional de Córdoba. Facultad de Matemática, Astronomía y Física, 2009.<br>El objetivo de esta tesis fue desarrollar y evaluar técnicas para optimizar la relación señal-ruido y mejorar el desempeño de las aplicaciones de la Resonancia Cuadrupolar Nuclear afectadas por la baja sensibilidad y el ensanchamiento inhomogéneo en las señales. Los métodos se han concentrado en la mejora de las técnicas de pulsos y la instrumentación del espectrómetro.

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39

Rudisch, Christian. "Nuclear Magnetic Resonance on Selected Lithium Based Compounds." Doctoral thesis, 2013. https://tud.qucosa.de/id/qucosa%3A27352.

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This thesis presents the NMR measurements on the single crystals LiMnPO4 and Li0.9FeAs. Therefore, the thesis is divided into two separated sections. The ﬁrst part reports on the competitive next generation cathode material LiMnPO4 with a stable reversible capacity up to 145 mAh/g and a rather ﬂat discharge voltage curve at 4.1 V. For the basic understanding of the material the magnetic properties have been investigated by a Li and P NMR study in the paramagnetic and antiferromagnetic phase. LiMnPO4 shows a strong anisotropy of the dipolar hyperﬁne coupling due to the strong local magnetic mom

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40

Klein, Susan P. "Nuclear magnetic resonance and nuclear quadrupole resonance study of atomic motion in YBa��Cu��O��." Thesis, 1995. http://hdl.handle.net/1957/34587.

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41

Henshaw, Seth. "An Investigation of the Isovector Giant Quadrupole Resonance in 209Bi using Polarized Compton Scattering." Diss., 2010. http://hdl.handle.net/10161/3076.

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<p><p></p><p>Giant multipole resonances are a fundamental property of nuclei and</p><p>arise from the collective motion of the nucleons inside</p><p>the nucleus. Careful studies of these resonances and their properties provides</p><p>insight into the nature of nuclear matter and constraints</p><p>which can be used to test our theories. </p><p></p></p><p><p></p><p>An investigation of the Isovector Giant Quadrupole Resonance (IVGQR)</p><p>in <sup>209</sup>Bi has been preformed using the High Intensity γ-ray</p><p>Source (HIγS) facility. Intense nearly monochromatic</p><p>pol

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Biagetti, Lisa. "Caracterización dinámica de la fase vítrea en clorotolueno." Bachelor's thesis, 2017. http://hdl.handle.net/11086/5793.

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En el presente trabajo se presentan resultados experimentales que permiten caracterizar dinámica y estructuralmente las fases sólidas encontradas en el p-clorotolueno y el o-clorotolueno a temperaturas mayores a 80 K. La evidencia de desorden resultante de los espectros de RCN es atribuida a la ocupación aleatoria de los sitios del cloro y el grupo metilo. En los dos compuestos hay evidencia de reorientaciones moleculares. En el caso del p-clorotolueno, estas reorientaciones ocurrirían en torno a un eje perpendicular al anillo bencénico y, en el o-clorotolueno, en torno a un eje de pseudosimet

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Usman, Iyabo Tinuola. "Identification of characteristic energy scales in nuclear isoscalar giant quadrupole resonances: Fourier transforms and wavelet analysis." Thesis, 2008. http://hdl.handle.net/10539/5302.

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The identification of energy scales in the region of Isoscalar Giant Quadrupole Resonance (ISGQR) is motivated by their potential use in understanding how an ordered collective motion transforms into a disordered motion of intrinsic single-particle degrees-of-freedom in many-body quantum systems. High energy-resolution measurements of the ISGQR were obtained by proton inelastic scattering at Ep= 200 MeV using the K600 magnetic Spectrometer at iThemba LABS. The nuclei 58Ni, 90Zr, 120Sn and 208Pb, associated with closed shells, were investigated. Both the Fourier transform and Wavelet analysis w

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Eles, Philip Thomas. "Peptide backbone orientation and dynamics in spider dragline silk and two-photon excitation in nuclear magnetic and quadrupole resonance." Thesis, 2005. http://hdl.handle.net/2429/17123.

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In the first part of the dissertation, spider dragline silk is studied by solid state NMR techniques. The dependence of NMR frequency on molecular orientation is exploited using the DECODER experiment to determine the orientation of the protein backbone within the silk fibre. Practical experimental considerations require that the silk fibres be wound about a cylindrical axis perpendicular to the external magnetic field, complicating the reconstruction of the underlying orientation distribution and necess-itating the development of numerical techniques for this purpose. A two-component mo

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