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Titlebook: Explosives Detection using Magnetic and Nuclear Resonance Techniques; Jacques Fraissard,Olga Lapina Conference proceedings 2009 Springer S

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書(shū)目名稱(chēng)Explosives Detection using Magnetic and Nuclear Resonance Techniques
編輯Jacques Fraissard,Olga Lapina
視頻videohttp://file.papertrans.cn/320/319709/319709.mp4
概述Comprehensive theoretical and technical coverage of NQR for explosives detection.Latest developments from leading experts in the field.Vastly more information in one book than can be found by mining t
叢書(shū)名稱(chēng)NATO Science for Peace and Security Series B: Physics and Biophysics
圖書(shū)封面Titlebook: Explosives Detection using Magnetic and Nuclear Resonance Techniques;  Jacques Fraissard,Olga Lapina Conference proceedings 2009 Springer S
描述.Nuclear quadrupole resonance (NQR) a highly promising new technique for bulk explosives detection: relatively inexpensive, more compact than NMR, but with considerable selectivity. Since the NQR frequency is insensitive to long-range variations in composition, mixing explosives with other materials, such as the plasticizers in plastic explosives, makes no difference. The NQR signal strength varies linearly with the amount of explosive, and is independent of its distribution within the volume monitored. NQR spots explosive types in configurations missed by the X-ray imaging method...But if NQR is so good, why it is not used everywhere? Its main limitation is the low signal-to-noise ratio, particularly with the radio-frequency interference that exists in a field environment, NQR polarization being much weaker than that from an external magnetic field. The distinctive signatures are there, but are difficult to extract from the noise. In addition, the high selectivity is partly a disadvantage, as it is hard to build a multichannel system necessary to cover a wide range of target substances. Moreover, substances fully screened by metallic enclosures, etc. are difficult to detect. A wor
出版日期Conference proceedings 2009
關(guān)鍵詞Biophysics; Mobile NMR; NATO; NMR; NQR Explosives Detection; Nuclear Quadrupole Resonance (NQR) Technique
版次1
doihttps://doi.org/10.1007/978-90-481-3062-7
isbn_softcover978-90-481-3061-0
isbn_ebook978-90-481-3062-7Series ISSN 1874-6500 Series E-ISSN 1874-6535
issn_series 1874-6500
copyrightSpringer Science+Business Media B.V. 2009
The information of publication is updating

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Prospectives and Limitations of Nqr Signal Enhancement by Polarisation Transfer,noise ratio depends in a subtle way on the spin-lattice relaxation rates of the involved spins, . . .(.H) and . . .(.N), as well as on the polarization transfer rate R(.H, .N) between the proton and the nitrogen nuclear spin reservoirs.
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1874-6500 y more information in one book than can be found by mining t.Nuclear quadrupole resonance (NQR) a highly promising new technique for bulk explosives detection: relatively inexpensive, more compact than NMR, but with considerable selectivity. Since the NQR frequency is insensitive to long-range varia
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Die Schenkelhalsfraktur beim Kind,tive with non-metallic bottles, independently of their shape and size. Other spectroscopic and bulk methods to identify illicit liquid substances as well as the potential of combining screening technologies are presented.
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Conference proceedings 2009 with considerable selectivity. Since the NQR frequency is insensitive to long-range variations in composition, mixing explosives with other materials, such as the plasticizers in plastic explosives, makes no difference. The NQR signal strength varies linearly with the amount of explosive, and is in
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Regulatory and Ethical Considerations,ddition, we demonstrate the intrinsic spatial resolution of the method by using a measurement electrodes with a range of sizes from 180 to 0.2 mm., corresponding to coupling capacitance of 1 pF to 1 fF. Conclusions are drawn as to some of the likely application areas for this signal acquisition technique.
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