標題: Titlebook: Explosives Detection using Magnetic and Nuclear Resonance Techniques; Jacques Fraissard,Olga Lapina Conference proceedings 2009 Springer S [打印本頁] 作者: Espionage 時間: 2025-3-21 16:29
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書目名稱Explosives Detection using Magnetic and Nuclear Resonance Techniques讀者反饋學(xué)科排名
作者: liposuction 時間: 2025-3-21 23:09 作者: GLIDE 時間: 2025-3-22 00:27
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.作者: gene-therapy 時間: 2025-3-22 04:33
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作者: 協(xié)議 時間: 2025-3-22 09:45 作者: Ibd810 時間: 2025-3-22 13:58
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.作者: Ibd810 時間: 2025-3-22 17:29 作者: Jogging 時間: 2025-3-22 23:24
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作者: 混合,攙雜 時間: 2025-3-23 04:19
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.作者: SNEER 時間: 2025-3-23 06:42 作者: forebear 時間: 2025-3-23 13:40
Eingriffe bei der Hüftkopfnekrosen echoes created by multiple echo formation pathways. The destructive interference can be greatly reduced using composite refocusing pulses in the NQR pulse sequences to force the echoes into selected echo formation pathways.作者: refraction 時間: 2025-3-23 14:28
Efficient Excitation and Ringing Suppression in Nuclear Quadrupole Resonance,n echoes created by multiple echo formation pathways. The destructive interference can be greatly reduced using composite refocusing pulses in the NQR pulse sequences to force the echoes into selected echo formation pathways.作者: Goblet-Cells 時間: 2025-3-23 18:34
https://doi.org/10.1007/978-3-663-05347-7ed. .N NQR signals in a 15 g trinitrotoluene sample of predominantly monoclinic modification were measured in 15 s in different polarization magnetic fields. The conditions for optimal polarization enhancement were determined.作者: Adenoma 時間: 2025-3-23 22:18 作者: SOW 時間: 2025-3-24 03:04 作者: 身體萌芽 時間: 2025-3-24 07:07
Fundamentals of Pulsed Nitrogen-14 Quadrupole Resonance,rtening the repetition time. Finally it has been possible to define proper phase cycles in view of measuring relaxation times (T. and T.) by a two-pulse sequence. In all cases, experimental verifications were performed in order to assess this methodology.作者: Conscientious 時間: 2025-3-24 11:19
Modeling of Qr Sensors for Optimized Explosives Detection,edict ROC curves for the QR detector and evaluate trade-offs between experimental parameters, sample characteristics, data processing, and hardware features of the detector. Numerical and experimental results are presented to validate our models, and demonstrate their usefulness for QR sensor design作者: Accord 時間: 2025-3-24 16:39
14N Nuclear Quadrupole Resonance Signals in Paranitrotoluene and Trinitrotoluene. Spin-Lock Spin-Ec applies mainly to trinitrotoluene, with 12 resonance frequencies between 837 and 871 kHz. Our frequency dependent investigation shows that the signal intensity as well as the effective spinspin relaxation time varies substantially with irradiation frequency in both samples. We provide a theoretical作者: sleep-spindles 時間: 2025-3-24 19:12
,Berry’s Phase in Nqr of Powders, polarization depending on the field amplitude, the pulse duration and the resonance offset. The manifestation of Berry‘s phase in NQR under the adiabatic rotation of nuclear magnetization, caused by r.f. pulses with resonance offset, is shown.作者: STELL 時間: 2025-3-25 02:32
Explosives Detection using Magnetic and Nuclear Resonance Techniques作者: incarcerate 時間: 2025-3-25 06:35 作者: 抵押貸款 時間: 2025-3-25 08:12 作者: visual-cortex 時間: 2025-3-25 14:59 作者: 旋轉(zhuǎn)一周 時間: 2025-3-25 15:49 作者: 心胸開闊 時間: 2025-3-25 22:13 作者: 斜坡 時間: 2025-3-26 02:22
,Literatur als medial-?sthetisches Ereignis,of the density matrix theory, it is demonstrated that, for each of the three NQR transitions, the (3,3) density matrix can be reduced to a (2,2) matrix, evidently easier to handle. (2,2) rotation matrices are defined for predicting, in a straightforward manner, the system evolution under a rf pulse.作者: Asymptomatic 時間: 2025-3-26 05:50
https://doi.org/10.1007/978-3-663-08547-8ighly selective but its sensitivity is poor, in particular for some products presenting long relaxation time like Tri-Nitro-Toluene (TNT). The limitation is given by the noise of the detecting system, mainly a resonant coil tuned at the detection frequency. Here we present a new approach with mixed 作者: Acetaldehyde 時間: 2025-3-26 09:50
https://doi.org/10.1007/978-3-663-05347-7 emphasis on .N NQR trinitrotoluene (TNT) detection at room temperature. Combination of proton—nitrogen level crossing polarization transfer and pulsed spin-locking sequence makes .N NQR in TNT fast and sensitive enough to be used in routine detection of explosives. Enhancement factors for .N NQR li作者: Charade 時間: 2025-3-26 14:29 作者: exclusice 時間: 2025-3-26 19:23 作者: cringe 時間: 2025-3-26 22:32 作者: 多節(jié) 時間: 2025-3-27 04:06
Wolfgang Lehmann,Helmut Burchhardtms. The sensitivity of a QR-based sensor in inductive detection can be assessed in terms of the signal-to-noise ratio (SNR), which determines the Receiver Operating Characteristics (ROC) curves of the detector and provides a fundamental limitation to the performance of the QR explosive detection sys作者: 持久 時間: 2025-3-27 08:16
Washington Machokoto,Lily Okechefforts to improve the function of the NQR based Explosive Detection Systems (EDS) through a more sensitive detection are described. The methods of reducing false alarm events generated from the RF excitation and interference are presented and discussed. The operational features of the NQR scanners 作者: 賄賂 時間: 2025-3-27 12:37 作者: doxazosin 時間: 2025-3-27 17:21 作者: 新娘 時間: 2025-3-27 21:11
Reduced and Low Fat Meat Products,igate the off-resonance effects of the Spin-Lock Spin-Echo multipulse sequence, a predecessor of many advanced pulse sequences used for the same enhancement. Two samples have been used: paranitrotoluene, with a single .N site as a model compound for trinitrotoluene, and trinitrotoluene itself, with 作者: Cardioversion 時間: 2025-3-27 22:54 作者: 通情達理 時間: 2025-3-28 03:40 作者: Instantaneous 時間: 2025-3-28 08:51
Deepa Suhag,Swati Kaushik,Vinod Bala Taxak.CH. (TNT) and ammonium nitrate NH.NO. (AN). A study of the behaviour of the nuclear quadrupole resonance (NQR) signals of AN and TNT is reported. A method for attenuating outside interference signals under conditions of an industrial environment are proposed and discussed.作者: keloid 時間: 2025-3-28 12:39 作者: 清真寺 時間: 2025-3-28 14:44 作者: 怪物 時間: 2025-3-28 19:48
Jacques Fraissard,Olga LapinaComprehensive 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作者: SLUMP 時間: 2025-3-29 00:05
NATO Science for Peace and Security Series B: Physics and Biophysicshttp://image.papertrans.cn/e/image/319709.jpg作者: 報復(fù) 時間: 2025-3-29 03:44
978-90-481-3061-0Springer Science+Business Media B.V. 2009作者: 錯事 時間: 2025-3-29 09:00 作者: 意見一致 時間: 2025-3-29 15:10 作者: GUEER 時間: 2025-3-29 16:07 作者: AGGER 時間: 2025-3-29 20:52
Ashish Dwivedi,A. B. Pant,Anurag Tripathire reviewed with a special emphasis on the detection of .N and .O. Various techniques, as for example,.are discussed and a strategy of detecting the nuclear quadrupole resonance frequencies is presented together with some illustrative examples.作者: 優(yōu)雅 時間: 2025-3-30 01:12
Jagdish Chander Dagar,Sharda Rani Guptaease sensitivity of .N NQR are discussed. It is shown that combination of 1H NMR with .N NQR leads to selective excitation or a better S/N; in this case, a strong magnetic field has to be switched on and off. Whereas to detect anti-tank mines strong magnetic field should be applied.作者: 全能 時間: 2025-3-30 07:55 作者: inveigh 時間: 2025-3-30 09:19
Anu Ruby Benny,Lina Anil,Amrita Dhinesh I = 1 we show that by this means it is possible to change the signal intensity of the transition detected. Theoretical and experimental studies of multiple-frequency sequences show that the proposed two-frequency sequences have considerable potential in the application of NQR for the detection of various materials.作者: connoisseur 時間: 2025-3-30 14:31
Deepa Suhag,Swati Kaushik,Vinod Bala Taxak.CH. (TNT) and ammonium nitrate NH.NO. (AN). A study of the behaviour of the nuclear quadrupole resonance (NQR) signals of AN and TNT is reported. A method for attenuating outside interference signals under conditions of an industrial environment are proposed and discussed.作者: Magnificent 時間: 2025-3-30 17:07
Detection of Explosives by Nqr Method: Main Aspects for Transport Security,efforts to improve the function of the NQR based Explosive Detection Systems (EDS) through a more sensitive detection are described. The methods of reducing false alarm events generated from the RF excitation and interference are presented and discussed. The operational features of the NQR scanners are also presented and discussed.作者: 保全 時間: 2025-3-31 00:06
Double Resonance Detection of (Mainly Nitrogen) Nqr Frequencies in Explosives and Drugs,re reviewed with a special emphasis on the detection of .N and .O. Various techniques, as for example,.are discussed and a strategy of detecting the nuclear quadrupole resonance frequencies is presented together with some illustrative examples.作者: 無動于衷 時間: 2025-3-31 04:55
