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Articoli di riviste sul tema "NQR instrumentation"

Autore: Grafiati

Pubblicato: 12 ottobre 2024

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1

Brown, R. J. C., A. Christides, M. Gourdji e L. Guibé. "NQR investigation on ThBr4 and instrumentation". Journal of Molecular Structure 192, n. 3-4 (gennaio 1989): 355–67. http://dx.doi.org/10.1016/0022-2860(89)85055-0.

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2

Blanz, M., T. J. Rayner e J. A. S. Smith. "A fast field-cycling NMR/NQR spectrometer". Measurement Science and Technology 4, n. 1 (1 gennaio 1993): 48–59. http://dx.doi.org/10.1088/0957-0233/4/1/009.

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3

Osokin, D. Ya, e R. R. Khusnutdinov. "A two-frequency coherent pulse NQR spectrometer". Instruments and Experimental Techniques 52, n. 1 (gennaio 2009): 85–89. http://dx.doi.org/10.1134/s0020441209010138.

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4

Apih, Tomaž, Veselko Žagar e Janez Seliger. "NMR and NQR study of polymorphism in carbamazepine". Solid State Nuclear Magnetic Resonance 107 (giugno 2020): 101653. http://dx.doi.org/10.1016/j.ssnmr.2020.101653.

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5

Lehmann-Horn, J. A., D. G. Miljak e T. J. Bastow. "75As, 63Cu NMR and NQR characterization of selected arsenic minerals". Solid State Nuclear Magnetic Resonance 54 (luglio 2013): 8–12. http://dx.doi.org/10.1016/j.ssnmr.2013.05.001.

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6

Glickstein, Jarred, e Soumyajit Mandal. "An automated instrument for polarization-enhanced broadband nuclear quadrupole resonance (NQR) spectroscopy". Review of Scientific Instruments 89, n. 9 (settembre 2018): 093106. http://dx.doi.org/10.1063/1.5041002.

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7

Rudakov, T. N., V. V. Fedotov, A. V. Belyakov e V. T. Mikhal’tsevich. "Suppression of transient processes in the oscillatory circuit of the NQR spectrometer". Instruments and Experimental Techniques 43, n. 1 (gennaio 2000): 78–81. http://dx.doi.org/10.1007/bf02759003.

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8

Rommel, E., D. Pusiol, P. Nickel e R. Kimmich. "Spectroscopic rotating-frame NQR imaging ( rho NQRI) using surface coils". Measurement Science and Technology 2, n. 9 (1 settembre 1991): 866–71. http://dx.doi.org/10.1088/0957-0233/2/9/007.

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9

Ambrosetti, Roberto, Claudia Forte e Domenico Ricci. "14N Fourier Transform Nuclear Quadrupole Resonance. Instrumentation: Measurements on Cyanuric Chloride". Zeitschrift für Naturforschung A 47, n. 1-2 (1 febbraio 1992): 421–29. http://dx.doi.org/10.1515/zna-1992-1-271.

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Abstract (sommario):

AbstractA Matec pulsed instrument, already equipped with a laboratory-built data system, has been considerably improved by adding new capabilities, such as versatile pulse sequence programming. Among other things, this allows automated T1 relaxation measurements. The instrument has been employed to record the 14N NQR FT spectrum of cyanuric chloride and measure its T1 relaxation time from 77 K to the melting point at 418 K. The four-line 14N spectrum indicates the presence of two chemically inequivalent sites. The intensity ratio of the lines identifies the site pertaining to a couple of symmetry-related 14N nuclei. The lines smoothly decrease in frequency up to the melting point, where they remain narrow and almost equally spaced. Considering previous results at 4.2 K, this indicates that a single phase is stable over the entire accessible temperature range. The relaxation time T1 decreases smoothly with increasing temperature, with a T-2 law, from nearly 180 s at 77 K to about 1 s near the melting point, where a precipitous decrease starts. The high T1 values found are consistent with the lack of nuclei having high magnetic moment.

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10

Perić, Berislav, Régis Gautier, Chris J. Pickard, Marko Bosiočić, Mihael S. Grbić e Miroslav Požek. "Solid-state NMR/NQR and first-principles study of two niobium halide cluster compounds". Solid State Nuclear Magnetic Resonance 59-60 (maggio 2014): 20–30. http://dx.doi.org/10.1016/j.ssnmr.2014.02.001.

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11

Brunetti, A. H. "An NQR study of the polymorphism of triphenylchloromethane". Solid State Nuclear Magnetic Resonance 25, n. 1-3 (gennaio 2004): 167–72. http://dx.doi.org/10.1016/j.ssnmr.2003.05.002.

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12

Sikorsky, Tomas, Andrzej Pelczar, Stephan Schneider e Thorsten Schumm. "Integrating superregenerative principles in a compact, power-efficient NMR/NQR spectrometer: A novel approach with pulsed excitation". Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 1062 (maggio 2024): 169239. http://dx.doi.org/10.1016/j.nima.2024.169239.

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13

Mikhaltsevitch, V. T., T. N. Rudakov, J. H. Flexman, P. A. Hayes e W. P. Chisholm. "Comparative experimental analysis of composite pulses in 14N NQR". Solid State Nuclear Magnetic Resonance 25, n. 1-3 (gennaio 2004): 61–63. http://dx.doi.org/10.1016/j.ssnmr.2003.03.012.

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14

Peshkovsky, A. S., L. Cerioni, T. M. Osan, N. I. Avdievich e D. J. Pusiol. "Three-dimensional high-inductance birdcage coil for NQR applications". Solid State Nuclear Magnetic Resonance 30, n. 2 (settembre 2006): 75–80. http://dx.doi.org/10.1016/j.ssnmr.2006.02.005.

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15

Pérez, Silvina C., Alberto Wolfenson e Mariano Zuriaga. "Isomorphism and disorder in o-chlorohalobenzenes studied by NQR". Solid State Nuclear Magnetic Resonance 57-58 (febbraio 2014): 39–45. http://dx.doi.org/10.1016/j.ssnmr.2013.12.002.

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16

Mikhaltsevitch, V. T., e T. N. Rudakov. "The transient processes in multi-pulse nitrogen-14 NQR". Solid State Nuclear Magnetic Resonance 24, n. 4 (dicembre 2003): 263–85. http://dx.doi.org/10.1016/s0926-2040(03)00031-6.

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17

Rommel, E., R. Kimmich, H. Robert e D. Pusiol. "A reconstruction algorithm for rotating frame NQR imaging ( rho NQRI) of solids with powder geometry". Measurement Science and Technology 3, n. 5 (1 maggio 1992): 446–50. http://dx.doi.org/10.1088/0957-0233/3/5/002.

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18

Monea, Cristian, Gabriel V. Iana, Silviu Ionita, Laurentiu M. Ionescu, Sandel A. Zaharia, Stelian Ilie e Nicu Bizon. "An optimized NQR spectrometer for detection of prohibited substances". Measurement 151 (febbraio 2020): 107158. http://dx.doi.org/10.1016/j.measurement.2019.107158.

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19

Zdanowska-Fra̧czek, M., e W. Medycki. "35Cl NQR and 19F NMR relaxation studies of CClF2 group dynamics in N(CH3)4H(ClF2CCOO)2". Solid State Nuclear Magnetic Resonance 6, n. 2 (aprile 1996): 141–46. http://dx.doi.org/10.1016/0926-2040(95)01216-8.

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20

Smith, John A. S., Michael D. Rowe, Kaspar Althoefer, Neil F. Peirson e Jamie Barras. "14N NQR, relaxation and molecular dynamics of the explosive TNT". Solid State Nuclear Magnetic Resonance 71 (ottobre 2015): 61–66. http://dx.doi.org/10.1016/j.ssnmr.2015.09.009.

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21

Rudakov, T. N., P. A. Hayes e J. H. Flexman. "Optimised NQR pulse technique for the effective detection of Heroin Base". Solid State Nuclear Magnetic Resonance 33, n. 3 (marzo 2008): 31–35. http://dx.doi.org/10.1016/j.ssnmr.2008.02.001.

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22

Sinyavsky, Nikolay, e Ivan Mershiev. "Measuring of short spin-spin relaxation times distributions using NQR nutation experiments". Solid State Nuclear Magnetic Resonance 104 (dicembre 2019): 101622. http://dx.doi.org/10.1016/j.ssnmr.2019.101622.

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23

Malone, Michael W., Michelle A. Espy, Sun He, Michael T. Janicke e Robert F. Williams. "The 1H T1 dispersion curve of fentanyl citrate to identify NQR parameters". Solid State Nuclear Magnetic Resonance 110 (dicembre 2020): 101697. http://dx.doi.org/10.1016/j.ssnmr.2020.101697.

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24

Samila, Andriy, Oleksandra Hotra e Jacek Majewski. "Implementation of the Configuration Structure of an Integrated Computational Core of a Pulsed NQR Sensor Based on FPGA". Sensors 21, n. 18 (9 settembre 2021): 6029. http://dx.doi.org/10.3390/s21186029.

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Abstract (sommario):

This paper presents a method for implementing the configuration structure of an integrated computational core of a pulsed nuclear quadrupole resonance (NQR) sensor based on a field-programmable gate array (FPGA), which comprises the following modules: a three-channel direct digital synthesizer (DDS), a pulse sequence shaper and a software-defined radio. Experimental studies carried out using the in-circuit analyzer SignalTap Logic Analyzer have confirmed the reliability of the correct and stable operation of the functional modules of the configuration structure at all stages of signal transformations, starting from the formation of the envelope of the excitation pulses and ending with the obtainment of low-frequency quadrature signals at the outlet of the compensating filters. The time and frequency dependences of the amplitude of the output signals generated using the DDS based on a 48 bit phase accumulator are investigated. This development can be used when creating pulsed coherent NQR sensors in the frequency range of 1 MHz–50 MHz.

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25

Samila, A., I. Safronov e O. Hotra. "Structural and functional synthesis of the continuous wave NQR temperature sensor with increased conversion linearity". Solid State Nuclear Magnetic Resonance 110 (dicembre 2020): 101700. http://dx.doi.org/10.1016/j.ssnmr.2020.101700.

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26

Furman, G. B., S. D. Goren, A. M. Panich e A. I. Shames. "Spin diffusion and nuclear spin-lattice relaxation in irradiated solids: a multiple-pulse NQR study". Solid State Nuclear Magnetic Resonance 14, n. 3-4 (settembre 1999): 145–55. http://dx.doi.org/10.1016/s0926-2040(99)00026-0.

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27

Mikhaltsevitch, V. T., e T. N. Rudakov. "Study of quasistationary and stationary states in the short-repetition-time sequences in the NQR of nitrogen". Solid State Nuclear Magnetic Resonance 25, n. 1-3 (gennaio 2004): 99–111. http://dx.doi.org/10.1016/j.ssnmr.2003.03.005.

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28

Poleshchuk, O. Kh, B. Nogaj, J. N. Latosińska e J. Koput. "Electronic structure of bridging halogen atoms in metal halide dimers studied by the AM1 method and NQR spectroscopy". Solid State Nuclear Magnetic Resonance 6, n. 3 (giugno 1996): 267–74. http://dx.doi.org/10.1016/0926-2040(96)01232-5.

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29

Larsen, Olav I., Morten Enersen, Anne Karin Kristoffersen, Ann Wennerberg, Dagmar F. Bunæs, Stein Atle Lie e Knut N. Leknes. "Antimicrobial Effects of Three Different Treatment Modalities on Dental Implant Surfaces". Journal of Oral Implantology 43, n. 6 (1 dicembre 2017): 429–36. http://dx.doi.org/10.1563/aaid-joi-d-16-00147.

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Resolution of peri-implant inflammation and re-osseointegration of peri-implantitis affected dental implants seem to be dependent on bacterial decontamination. The aims of the study were to evaluate the antimicrobial effects of 3 different instrumentations on a micro-textured dental implant surface contaminated with an avirulent or a virulent Porphyromonas gingivalis strain and to determine alterations to the implant surface following instrumentation. Forty-five dental implants (Straumann SLA) were allocated to 3 treatment groups: Er:YAG laser, chitosan brush, and titanium curette (10 implants each) and a positive (10 implants) and a negative (5 implants) control. Each treatment group and the positive control were split into subgroups of 5 implants subsequently contaminated with either the avirulent or virulent P. gingivalis strain. The antimicrobial effect of instrumentation was evaluated using checkerboard DNA–DNA hybridization. Implant surface alterations were determined using a light interferometer. Instrumentation significantly reduced the number of attached P. gingivalis (P < .001) with no significant differences among groups (P = .310). A significant overall higher median score was found for virulent compared with avirulent P. gingivalis strains (P = .007); the Er:YAG laser uniquely effective removing both bacterial strains. The titanium curette significantly altered the implant surface micro-texture. Neither the Er:YAG laser nor the chitosan brush significantly altered the implant surface. The 3 instrumentations appear to have a similar potential to remove P. gingivalis. The titanium curette significantly altered the microstructure of the implant surface.

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30

Korneva, I., M. Ostafin, N. Sinyavsky, B. Nogaj e M. Maćkowiak. "Determination of the electric field gradient asymmetry from 2D nutation NQR spectra of 75As nuclei in oriented samples of As2Se3 semiconductor". Solid State Nuclear Magnetic Resonance 31, n. 3 (maggio 2007): 119–23. http://dx.doi.org/10.1016/j.ssnmr.2007.03.001.

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31

Smith, John A. S., Michael D. Rowe, Kaspar Althoefer, Neil F. Peirson e Jamie Barras. "Off-resonance effects in 14N NQR signals from the pulsed spin-locking (PSL) and three-pulse echo sequence; a study for monoclinic TNT". Solid State Nuclear Magnetic Resonance 71 (ottobre 2015): 41–54. http://dx.doi.org/10.1016/j.ssnmr.2015.10.004.

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32

Stark, Edward, e Karen Luchter. "NIR Instrumentation Technology". NIR news 16, n. 7 (novembre 2005): 13–16. http://dx.doi.org/10.1255/nirn.855.

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33

Odin, Christophe. "Repetitive experiments of one or two-pulse sequences in NQR of spins I=3/2: Liouville space, steady-state, Ernst angle and optimum signal". Solid State Nuclear Magnetic Resonance 85-86 (settembre 2017): 25–33. http://dx.doi.org/10.1016/j.ssnmr.2017.04.004.

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34

Mayo, Ann M. "Psychometric Instrumentation". Clinical Nurse Specialist 29, n. 3 (2015): 134–38. http://dx.doi.org/10.1097/nur.0000000000000131.

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35

Edelstein, William A. "Oil core NMR imaging/spectroscopy instrumentation". Magnetic Resonance Imaging 9, n. 5 (gennaio 1991): 865–67. http://dx.doi.org/10.1016/0730-725x(91)90390-8.

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36

Hatipoğlu, Şirin, e Tuğçe Paksoy. "Do Conventional and New-Generation Multiple Ultrasonic Applications Change the Shear Bond Strength of Metal Brackets?" Journal of Dental Research and Review 9, n. 1 (gennaio 2022): 29–34. http://dx.doi.org/10.4103/jdrr.jdrr_175_21.

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Background: The purpose of this study was to compare orthodontic braces' shear bond strength (SBS) before and after conventional and new-generation multiple ultrasonic instrumentations (UIs). Materials and Methods: One hundred and seventy-five extracted human premolars were bracketed and embedded in acrylic molds. Teeth were separated into 7 groups; each group consisted of 25 teeth. All samples were thermocycled 500 times and control group was randomly selected. To the rest of the teeth, UI and vector ultrasonic instrumentation (VUI) were performed, UI1 and VUI1 were separated. Following the second thermocycling, UI and VUI; UI2 and VUI2, and after the third thermocycling, UI and VUI the UI3 and VUI3 were separated. Results: The decreases in the mean SBS of the UI3 and VUI3 were found to be statistically significant compared to the control group's means. There were no statistically significant differences between neither the means of the control group and UI1, UI2, VUI1, VUI2; nor the means of the VUI1-UI1; VUI2-UI2; VUI3-UI3. There was no statistically significant difference among the means of the UI1-UI2-UI3. On the other hand, the VUI3 was found to have the least statistically significant SBS among VUI groups. Conclusions: Our results revealed that multiple UI and VUI applications both reduce the SBS of brackets. Although the reduction with VUI was found to be more than UI, there was no statistically significant difference between the two instrumentations. Both procedures can be used with caution as a multiple cleaning aid for patients undergoing fixed orthodontic treatment.

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37

Anoardo, E., G. Galli e G. Ferrante. "Fast-field-cycling NMR: Applications and instrumentation". Applied Magnetic Resonance 20, n. 3 (aprile 2001): 365–404. http://dx.doi.org/10.1007/bf03162287.

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38

Davies, Tony. "NIR Instrumentation Companies: The Story So Far". NIR news 10, n. 6 (dicembre 1999): 14–15. http://dx.doi.org/10.1255/nirn.547.

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39

Himmelsbach, D. S., F. E. Barton e D. E. Akin. "Comparison of Responses of 13C NMR and NIR Diffuse Reflectance Spectroscopies to Changes in Particle Size and Order in Cellulose". Applied Spectroscopy 40, n. 7 (settembre 1986): 1054–58. http://dx.doi.org/10.1366/0003702864508133.

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High-resolution solid-state 13C NMR and NIR diffuse reflectance spectra were obtained on microcrystalline and “noncrystalline” celluloses. Particle sizes and relative crystallinity were confirmed by scanning electron microscopy and MIR transmission spectroscopy, respectively. The results showed that NMR is more sensitive to order changes and less sensitive to particle size. NIR reflectance, on the other hand, is very sensitive to particle size changes and essentially insensitive to differences in order.

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40

Nordon, Alison, Céline Meunier, Colin A. McGill e David Littlejohn. "Comparison of Calibration Methods for the Monitoring of a Fluorobenzene Batch Reaction Using Low-Field 19F NMR, 1H NMR, NIR, and Raman Spectrometries". Applied Spectroscopy 56, n. 4 (aprile 2002): 515–20. http://dx.doi.org/10.1366/0003702021954971.

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The suitability of different process spectrometry techniques has been assessed, in terms of calibration requirements, accuracy, and precision, for the at-line monitoring of the sulfonation of fluorobenzene. Partial least-squares (PLS) calibration was required to analyze the spectra obtained by NIR spectrometry and low-field (29.1 MHz) 1H NMR spectrometry. The low-field (27.4 MHz) 19F NMR spectra contained well-resolved signals for the three fluorine containing compounds and univariate calibration was adequate. The Raman spectra of two of the compounds exhibited fluorescence and so this technique was not considered suitable for monitoring the reaction. The accuracy of the results obtained using univariate analysis of the 19F NMR data and PLS analysis of NIR data were comparable (average % error of 3.5 and 2.9%, respectively, for concentrations >0.5 mol dm−3 and 11.3 and 11.1%, respectively, for <0.5 mol dm−3). The least accurate results were obtained using PLS analysis of low-field 1H NMR data, as the spectra of two of the components were too similar. For concentrations >0.05 mol dm−3, the most precise results were obtained with PLS analysis of NIR data (average RSD of 1.6%), although the precision of the results obtained using univariate analysis of 19F NMR data was still good (average RSD of 3.7%).

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41

Pham, Pierce, Ratnamala Mandal, Chang Qi e Christian Hilty. "Interfacing Liquid State Hyperpolarization Methods with NMR Instrumentation". Journal of Magnetic Resonance Open 10-11 (giugno 2022): 100052. http://dx.doi.org/10.1016/j.jmro.2022.100052.

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42

Hallberg, Fredrik, István Furó, Pavel V. Yushmanov e Peter Stilbs. "Sensitive and robust electrophoretic NMR: Instrumentation and experiments". Journal of Magnetic Resonance 192, n. 1 (maggio 2008): 69–77. http://dx.doi.org/10.1016/j.jmr.2008.02.001.

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43

Bronskill, Michael. "NMR in Medicine: The Instrumentation and Clinical Applications". Radiology 164, n. 1 (luglio 1987): 198. http://dx.doi.org/10.1148/radiology.164.1.198.

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44

Bellon-Maurel, Véronique. "NIR Imaging Spectroscopy Instrumentation: Looking Forward to 2020?" NIR news 17, n. 7 (novembre 2006): 14–23. http://dx.doi.org/10.1255/nirn.927.

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45

Smith, Francis W. "NMR in medicine: The instrumentation and clinical applications". Magnetic Resonance Imaging 6, n. 1 (gennaio 1988): 101. http://dx.doi.org/10.1016/0730-725x(88)90535-8.

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46

Joaquim, Andrei F., Enrico Ghizoni, Diogo V. Anderle, Evandro de Oliveira e Helder Tedeschi. "Axis instrumentation: surgical results". Arquivos de Neuro-Psiquiatria 70, n. 11 (novembre 2012): 857–63. http://dx.doi.org/10.1590/s0004-282x2012001100007.

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OBJECTIVE: Evaluate the surgical results of axis screw instrumentation. METHODS: Retrospective evaluation of the clinical and radiological data of patients submitted to axis fixation using screws. RESULTS: Seventeen patients were surgically treated. The mean age was 41.8 years (range: 12-73). Spinal cord trauma was the most common cause of instability (8 patients - 47%). Bilateral axis fixation was performed in all cases, except one, with laminar screw (total of 33 axis screws). Seven patients (41.1%) underwent bilateral pars screws; laminar screws were used in six cases and pedicular screws were used in two. In two cases, we performed a hybrid construction (laminar + pars and pedicle + pars). There was no neurological worsening or death, nor complications directly related to use axis screws. CONCLUSION: Axis instrumentation was effective and safe, regardless of the technique used for stabilization. Based on our learnt experience, we proposed an algorithm to choose the best technique for axis screw fixation.

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47

Miller, Faith G., T. Chris Riley-Tillman, Sandra M. Chafouleas e Alyssa A. Schardt. "Direct Behavior Rating Instrumentation". Assessment for Effective Intervention 42, n. 2 (24 luglio 2016): 119–26. http://dx.doi.org/10.1177/1534508416658007.

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Abstract (sommario):

The purpose of this study was to investigate the impact of two different Direct Behavior Rating–Single Item Scale (DBR-SIS) formats on rating accuracy. A total of 119 undergraduate students participated in one of two study conditions, each utilizing a different DBR-SIS scale format: one that included percentage of time anchors on the DBR-SIS scale and an explicit reference to duration of the target behavior (percent group) and one that did not include percentage anchors nor a reference to duration of the target behavior (no percent group). Participants viewed nine brief video clips and rated student behavior using one of the two DBR-SIS formats. Rating accuracy was determined by calculating the absolute difference between participant ratings and two criterion measures: systematic direct observation scores and DBR-SIS expert ratings. Statistically significant differences between groups were found on only two occasions, pertaining to ratings of academically engaged behavior. Limitations and directions for future research are discussed.

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48

Heaton, B., e L. Eastwood. "The effect of NMR scanners on health physics instrumentation". Journal of the Society for Radiological Protection 5, n. 2 (giugno 1985): 67–70. http://dx.doi.org/10.1088/0260-2814/5/2/001.

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49

Jazayeri-Rad, H., e M. A. Browne. "Intelligent instrumentation for selective pulse excitation in NMR imaging". Journal of Physics E: Scientific Instruments 20, n. 6 (giugno 1987): 643–48. http://dx.doi.org/10.1088/0022-3735/20/6/014.

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50

Anoardo, E., G. Galli e G. Ferrante. "ChemInform Abstract: Fast-field-cycling NMR: Applications and Instrumentation." ChemInform 33, n. 10 (22 maggio 2010): no. http://dx.doi.org/10.1002/chin.200210280.

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