Academic literature on the topic 'Nuclear Quadrupole Resonance (NQR)'

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Journal articles on the topic "Nuclear Quadrupole Resonance (NQR)"

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Bray, Philip J., and Gary L. Petersen. "NMR and NQR Studies of Borate Glasses." Zeitschrift für Naturforschung A 53, no. 6-7 (1998): 273–84. http://dx.doi.org/10.1515/zna-1998-6-704.

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Abstract Nuclear magnetic resonance (NMR) has been used for some 40 years to study atomic arrangements, chemical bonding, and structural groupings in borate glasses and crystalline compounds, and nuclear quadrupole resonance (NQR) has more recently increased the resolution and accuracy of the measurements. Examples are presented of the use of first-order and second-order quadrupolar effects in 11B NMR spectra to obtain structural information, and 11B and 10B NQR spectra to obtain the quadrupolar parameters Qcc (the coupling constant) and ƞ (the asymmetry parameter) with accuracies of 5 or 6 si
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Grechishkin, V. S. "New Methods of Nuclear Quadrupole Resonance." Zeitschrift für Naturforschung A 45, no. 3-4 (1990): 559–64. http://dx.doi.org/10.1515/zna-1990-3-460.

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Abstract New NQR methods, developed over the past years, are discussed: 1. Two frequency NQR double resonance, 2. the influence of strong off-resonance combination of rf pulses on demagnetized state in NQR, 3. remote NQR.
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Blinc, R. "NQR in Dipolar and Quadrupolar Glasses." Zeitschrift für Naturforschung A 45, no. 3-4 (1990): 313–22. http://dx.doi.org/10.1515/zna-1990-3-417.

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Abstract It is shown that nuclear quadrupole resonance and quadrupole perturbed magnetic resonance represent a powerful technique to determine the local polarization distribution and its second moment, the Edwards-Anderson order parameter, in proton and deuteron glasses. For quadrupolar glasses the local orientational distribution function can be determined from the inhomogeneous NMR or NQR lineshape, thus allowing for a measurement of the quadrupolar Edwards-Anderson order parameter. The comparison of the temperature dependences of the thus obtained order parameters with theoretical predictio
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Seliger, J., and R. Blinc. "2 D Methods in NQR Spectroscopy." Zeitschrift für Naturforschung A 47, no. 1-2 (1992): 333–41. http://dx.doi.org/10.1515/zna-1992-1-258.

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AbstractThe application of two-dimensional spectroscopy to nuclear quadrupole resonance (NQR) is reviewed with special emphasys on spin 3/2 nuclei. A new two-dimensional level crossing double resonance NQR nutation technique based on magnetic field cycling is described. This technique allows for a determination of both the electric quadrupole coupling constant and the asymmetry parameter for spin 3/2 nuclei in powdered samples even in cases where the quadrupolar signals are too weak to be observed directly. It works if the usual double resonance conditions are met, i.e. if the spin-lattice rel
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Taylor, P. Craig. "Nuclear Quadrupole Resonance in Amorphous Semiconductors." Zeitschrift für Naturforschung A 51, no. 5-6 (1996): 603–10. http://dx.doi.org/10.1515/zna-1996-5-639.

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Abstract Nuclear quadrupole resonance (NQR) has provided a valuable tool for investigating the local structural order in semiconducting glasses. Measurements of NQR lineshapes and spin-lattice relaxation times help elucidate the local structural order and the unusual vibrational properties, respectively, of these glasses. In addition, NQR lineshape measurements on samples that are made under conditions that produce solids whose structures are far from equilibrium, such as fast-evap-orated films or rapidly-drawn fibers, provide detailed information on the changes in the local structural order f
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Sinyavsky, Nicolay, and Mariusz Mackowiak. "Nutation Spectra of Nuclear Quadrupole Resonance in Off-Resonance Conditions." Zeitschrift für Naturforschung A 59, no. 4-5 (2004): 228–34. http://dx.doi.org/10.1515/zna-2004-4-506.

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The modes of recording the multidimensional NQR nutation spectra have been analyzed using different off-resonance methods. A method of recording the nutation spectra in off-resonance conditions, based on optimal filtration, has been proposed. For the first time, an experimental spectrum of 3D-35Cl NQR nutation of chloral hydrate is presented.
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Basu, Rama. "Nuclear Quadrupole Resonance Studies on Molecular Complexes." Zeitschrift für Naturforschung A 41, no. 1-2 (1986): 240–42. http://dx.doi.org/10.1515/zna-1986-1-242.

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NQR studies of a number of molecular complexes with p-chloronitrobenzene and o-chloronitrobenzene as acceptors and different hydrocarbons as donors were carried out. A linear relationship between the NQR shift and the ionization potentials o f the donors is obtained. Maksyutin’s idea o f a positive shift with respect to acceptors having a quadrupolar nucleus is shown to hold in those systems. Townes and Dailey’s method was applied to calculate the change in the ionicity of the C - Cl bond on complexation to account for the σ-electronic contributions in the systems.
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Clarke, John. "Low Frequency Nuclear Quadrupole Resonance with SQUID Amplifiers." Zeitschrift für Naturforschung A 49, no. 1-2 (1994): 5–13. http://dx.doi.org/10.1515/zna-1994-1-204.

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Abstract The dc SQUID (Superconducting QUantum Interference Device) can be configured as an ampli­fier of spin-echos with a noise temperature of approximately 10 mK (f/1 M Hz) at an operating temperature of 1.5 K. A Fourier transform spectrometer based on a SQUID with a superconducting input circuit and operated in a flux-locked loop is used to obtain nuclear quadrupole resonance (NQR) spectra in a broadband m ode over the bandwith 0 -1 M Hz. Spin-echo spectra of 14N in NH4ClO4 reveal sharp NQR resonances, obtained simultaneously, at 17.4, 38.8 and 56.2 kHz. At 1.5 K, the measured longitudinal
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Huang, Xue Yi, Geng Guang Xu, and Feng Long Hao. "The Detection of Concealed Targets Based on NQR of Nitrogen-14." Applied Mechanics and Materials 596 (July 2014): 505–10. http://dx.doi.org/10.4028/www.scientific.net/amm.596.505.

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Nuclear quadrupole resonance (NQR) is an advanced radio frequency (RF) spectroscopic technique, widely used to analyse substances containing quadrupole nuclei, such as2H,14N,17O,35Cl and39K. In this paper, we focus on the NQR detection of nitrogenous compounds including nucleus Nitrogen-14 or14N. We will briefly introduce its fundamental principles, namely, nuclear quadrupole moment and NQR detection mechanism, and then provide some experimental results based on these theories, such as sodium nitrite, methenamine, urea and thiourea. At last, according to these results, we will make some discus
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Raevsky, A. M., A. G. Gukalova, and G. K. Semin. "Nuclear Quadrupole Resonance of Antimony in Ln3Sb5O12 Crystals." Zeitschrift für Naturforschung A 49, no. 6 (1994): 687–89. http://dx.doi.org/10.1515/zna-1994-0605.

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Abstract Complete 121,123Sb NQR spectra of crystalline rate earth antimonites Ln3Sb5O12 (Ln = La, Nd, Er, Lu) were recorded at 77 K. The quadrupole coupling constants and asymmetry parameters of the electric field gradient were measured. A “lanthanide compression” effect on the antimony NQR was observed. Using relations found for the antimonites under study, the Sb spectral parameters of other lanthanide compounds can be predicted.
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Dissertations / Theses on the topic "Nuclear Quadrupole Resonance (NQR)"

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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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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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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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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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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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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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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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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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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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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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Books on the topic "Nuclear Quadrupole Resonance (NQR)"

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Wasylishen, Roderick E., Sharon E. Ashbrook, and Stephen Wimperis. NMR of quadrupolar nuclei in solid materials. Wiley, 2012.

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NMR of quadrupolar nuclei in solid materials. Wiley, 2012.

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M, Rentería, Saitovitch E. Baggio-, Petrilli H, and SpringerLink (Online service), eds. HFI/NQI 2007: Proceedings of the 14th International Conference on Hyperfine Interactions and 18th International Symposium on Nuclear Quadrupole Interactions (HFI/NQI 2007) Iguassu Falls (Puerto Iguazú-Argentina / Foz de Iguaçcu-Brasil), 5–10 August 2007. Springer-Verlag Berlin Heidelberg, 2008.

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Chihara, H., ed. Nuclear Quadrupole Resonance Spectroscopy Data. Springer-Verlag, 1997. http://dx.doi.org/10.1007/b61951.

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Buslaev, Yu A. Nuclear quadrupole resonance in inorganic chemistry. Elsevier, 1987.

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Sini︠a︡vskiĭ, N. I︠A︡. Nutat︠s︡ionnai︠a︡ radiospektroskopii︠a︡ i︠a︡dernogo kvadrupolʹnogo rezonansa. Baltiĭskai︠a︡ gos. akademii︠a︡ rybopromyslovogo flota, 2009.

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Monea, Cristian, and Nicu Bizon. Signal Processing and Analysis Techniques for Nuclear Quadrupole Resonance Spectroscopy. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-87861-0.

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Turk, Ahmet S. Subsurface sensing. Wiley, 2010.

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Turk, Ahmet S. Subsurface sensing. Wiley, 2010.

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Wasylishen, Roderick E., Sharon E. Ashbrook, and Stephen Wimperis. NMR of Quadrupolar Nuclei in Solid Materials. Wiley & Sons, Incorporated, John, 2012.

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Book chapters on the topic "Nuclear Quadrupole Resonance (NQR)"

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Wright, John R., Wayne A. Hendrickson, Shigemasa Osaki, and Gordon T. James. "Nuclear Quadrupole Resonance (Nqr)." In Physical Methods for Inorganic Biochemistry. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4684-4997-6_3.

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Ahluwalia, V. K. "Nuclear Quadrupole Resonance (NQR) Spectroscopy." In Instrumental Methods of Chemical Analysis. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-38355-7_30.

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Monea, Cristian, and Nicu Bizon. "Solutions to Improve NQR Detection." In Signal Processing and Analysis Techniques for Nuclear Quadrupole Resonance Spectroscopy. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87861-0_9.

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Furman, G. B., V. M. Meerovich, and V. L. Sokolovsky. "Entanglement in nuclear quadrupole resonance." In HFI / NQI 2010. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-1269-0_78.

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Monea, Cristian, and Nicu Bizon. "Development of Signal Analysis Algorithms for NQR Detection." In Signal Processing and Analysis Techniques for Nuclear Quadrupole Resonance Spectroscopy. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87861-0_8.

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Haas, Heinz. "Hyperfine interaction and nuclear quadrupole resonance." In HFI / NQI 2010. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-1269-0_82.

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Mallick, Prabal Kumar. "Nuclear Magnetic Resonance (NMR), Electron Spin or Paramagnetic Resonance (ESR/EPR) and Nuclear Quadrupole Resonance (NQR) Spectroscopy." In Fundamentals of Molecular Spectroscopy. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0791-5_9.

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Monea, Cristian, and Nicu Bizon. "Study of the NQR Signal Processing and Analysis Algorithms." In Signal Processing and Analysis Techniques for Nuclear Quadrupole Resonance Spectroscopy. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87861-0_6.

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Somasundaram, S. D., K. Althoefer, J. A. S. Smith, and L. D. Seneviratne. "Detection of Landmines Using Nuclear Quadrupole Resonance (NQR): Signal Processing to Aid Classification." In Climbing and Walking Robots. Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-26415-9_100.

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Chizhik, Vladimir I., Yuri S. Chernyshev, Alexey V. Donets, Vyacheslav V. Frolov, Andrei V. Komolkin, and Marina G. Shelyapina. "Nuclear Quadrupole Resonance." In Magnetic Resonance and Its Applications. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05299-1_8.

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Conference papers on the topic "Nuclear Quadrupole Resonance (NQR)"

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Garroway, Allen N., Michael L. Buess, James P. Yesinowski, Joel B. Miller, and Ronald A. Krauss. "Explosives detection by nuclear quadrupole resonance (NQR)." In SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, edited by Andre H. Lawrence. SPIE, 1994. http://dx.doi.org/10.1117/12.189164.

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He, Gaokui, Xiangyang Zhang, Guobao Wang, Yuqing Wan, and Huayang Tian. "Nuclear Quadrupole Resonance Technology Applied in the Field of Explosives Detection." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-15072.

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There are a number of detection techniques for the detection of explosives, 14N nuclear quadrupole resonance (NQR) is a very promising technique owing to its unambiguous detection and identification of explosives. with this unique advantage, NQR technique gets more and more attentions around the world. Almost all of the explosives contain nitrogen element, the 14N nucleus is a non-spherically symmetric nucleus and has a quadrupole moment, the same 14N nuclei in different substances have different NQR frequencies, therefore, each substance is characterized by its own NQR frequency. So far, ther
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Somasundaram, Samuel D., Andreas Jakobsson, John A. S. Smith, and Kaspar A. Althoefer. "Frequency selective detection of nuclear quadrupole resonance (NQR) spin echoes." In Defense and Security Symposium, edited by J. Thomas Broach, Russell S. Harmon, and John H. Holloway, Jr. SPIE, 2006. http://dx.doi.org/10.1117/12.665444.

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DeBardelaben, James A., Jeremy K. Miller, Wilbur L. Myrick, Joel B. Miller, G. Charmaine Gilbreath, and Blerta Bajramaj. "Enhancing nuclear quadrupole resonance (NQR) signature detection leveraging interference suppression algorithms." In SPIE Defense, Security, and Sensing. SPIE, 2012. http://dx.doi.org/10.1117/12.920942.

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Rowe, M. D. "Mine detection by nuclear quadrupole resonance." In EUREL International Conference. The Detection of Abandoned Land Mines: A Humanitarian Imperative Seeking a Technical Solution. IEE, 1996. http://dx.doi.org/10.1049/cp:19961080.

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Somasundaram, S. D., A. Jakobsson, N. R. Butt, M. D. Rowe, J. A. S. Smith, and K. Althoefer. "Detection of Stochastic Nuclear Quadrupole Resonance Signals." In 2007 15th International Conference on Digital Signal Processing. IEEE, 2007. http://dx.doi.org/10.1109/icdsp.2007.4288595.

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Hibbs, Andrew D., Geoffrey A. Barrall, Peter V. Czipott, et al. "Land mine detection by nuclear quadrupole resonance." In Aerospace/Defense Sensing and Controls, edited by Abinash C. Dubey, James F. Harvey, and J. Thomas Broach. SPIE, 1998. http://dx.doi.org/10.1117/12.324225.

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Miller, Joel B. "Nuclear quadrupole resonance detection of explosives: an overview." In SPIE Defense, Security, and Sensing, edited by Russell S. Harmon, John H. Holloway, Jr., and J. Thomas Broach. SPIE, 2011. http://dx.doi.org/10.1117/12.887213.

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Monea, Cristian. "Improved Signal Models for Nuclear Quadrupole Resonance Spectroscopy." In 2020 12th International Conference on Electronics, Computers and Artificial Intelligence (ECAI). IEEE, 2020. http://dx.doi.org/10.1109/ecai50035.2020.9223187.

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Zhu, Kairan, Zhifeng Zhao, and Huiqin Jia. "Nuclear quadrupole resonance signal detectability enhancement methods — An overview." In 2017 International Conference on Information and Communication Technology Convergence (ICTC). IEEE, 2017. http://dx.doi.org/10.1109/ictc.2017.8190986.

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Reports on the topic "Nuclear Quadrupole Resonance (NQR)"

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Deas, Robert M., Constantino Cervantes, and Stephen F. Schaedel. Landmine Detection by Nuclear Quadrupole Resonance (NQR). Defense Technical Information Center, 2004. http://dx.doi.org/10.21236/ada431654.

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Espy, Michelle A., Todor Karaulanov, Young Jin Kim, Algis V. Urbaitis, Petr L. Volegov, and Jacob Yoder. Nuclear Quadrupole Resonance (NQR) for stand-off detection of contraband. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1095841.

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Hintenlang, D. E., K. Jamil, and L. H. Iselin. Mixed-radiation-field dosimetry utilizing Nuclear Quadrupole Resonance. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/6707222.

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Hintenlang, D. Mixed radiation field dosimetry utilizing Nuclear Quadrupole Resonance. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/5880716.

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Chang, Jih Wen. Low-frequency nuclear quadrupole resonance with a dc SQUID. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/10147735.

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Chang, J. W. Low-frequency nuclear quadrupole resonance with a dc SQUID. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/5258685.

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Hintenlang, D. E., K. Jamil, and L. H. Iselin. Mixed-radiation-field dosimetry utilizing Nuclear Quadrupole Resonance. Final report. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10138695.

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TonThat, Dinh M. DC SQUID Spectrometers for Nuclear Quadrupole and Low-Field Nuclear Magnetic Resonance Spectroscopy. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/760336.

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Hintenlang, D. Mixed radiation field dosimetry utilizing Nuclear Quadrupole Resonance. Technical progress report. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/10111977.

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Iselin, L. H. Using nitrogen-14 nuclear quadrupole resonance and electric field gradient information for the study of radiation effects. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/527440.

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