核四极共振,nuclear quadrupole resonance
1)nuclear quadrupole resonance核四极共振
1.The development in the research of explosives detection, including the detection method ofnuclear quadrupole resonance, types of signal excitation, multipulses technologies, the elimination of false and interferential sign and the relation between explosive andnuclear quadrupole resonance signal at domestic and abroad is reviewed with 23 references.综述了探测炸药在国内外研究的进展,包括核四极共振的探测方法、激励信号的方式和多脉冲序列技术、SQUIDs先进探测技术的应用、虚假信号及干扰信号的消除和炸药与核四极共振信号的关系,提出了核四极共振探测炸药中存在的问题及解决该问题的建议。
2.It doesn\"t create new ringing and doesn\"t operate during the reception ofnuclear quadrupole resonance signal and there\"s no loss in sensitivity.介绍了一种用于主动减小核四极共振(NQR)探头恢复时间的Q值变换电路,它利用MOSFET控制变Q电路与探头电路的耦合,并通过变压器增加与电感线圈串联的阻抗值以达到改变Q值的目的。
英文短句/例句
1.An Information Database on Detecting Hidden Explosives with NQR-Based Methods核四极共振隐藏炸药探测信息库设计
2.An Efficient Fast Recovery Scheme for Nuclear Quadrupole Resonance Single Coil Probe一种快速有效的核四极共振探头恢复方法
3.Method for Explosive Detection Using Nuclear Quadrupole Resonance/Electromagnetic Induction (NQR/EMI)一种探测炸药的核四极矩共振/电磁感应方法
4.Study of Laser-Polarized ～(129)Xe via Nuclear Magnetic Resonance;激光极化～（129）Xe的核磁共振研究
5.A Study on the Polarities of Stationary Phases by Proton Magnetic Resonance (PMR)用质子核磁共振研究气相色谱固定相的极性
6.An MRI exam on Thursday showed the herniated disc.在星期四进行MRI核磁共振检查出来骨盘间突出。
7.The most radical of the new approaches uses “quadrupole resonance technology”.最引人注目的新方法是使用“四极矩共振技术”（注四）。
8.~1H NMR Investigations of Supramolecular Complex between β-cyclodextrin and Tetrahydrofuran;超分子络合物β-环糊精——四氢呋喃的核磁共振氢谱分析
9.NMRS Determination of Equivalent Water Content in Nitrogen Tetroxide核磁共振波谱法测定四氧化二氮中的相当水含量
10.Evaluation of Uncertainty of Measurement for Determination of Equivalent Water Content in Nitrogen Tetroxide by NMR Method核磁共振法测定四氧化二氮中相当水含量测量不确定度评定
11.isovector quadrupole oscillation同位旋矢量四极振荡
12.calar quadrupole oscillatio同位旋标量四极振荡
13.gas-tetrode relaxation oscillator充气四极管张弛振荡器
14.differential nuclear magnetic resonance magnetometer差动式核磁共振磁强计
15.nuclear paramagnetic resonance chemical analyzer核顺磁共振化学分析器
16.nuclear magnetic resonance signal survey system核磁共振信号观测系统
17.high resolution nuclear magnetic resonance spectroscopy高分辨核磁共振光谱学
18.nuclear-electron double resonance spectrometer核-电子双共振谱仪
相关短句/例句
NQR核四极共振
1.Responses to 1 2 pulses forNQR spin system of I=1 with small energy level separation are examined with fictitious spin 1/2 operator formalism.用虚拟自旋—１/２算符理论考察了Ｉ＝１的核四极共振自旋系统在其能级间隔较小时对１—２个脉冲的响应。
2.The spin－lattice relaxation for a ~14NNQR spin system is a dual exponential relax-ation.￣１４Ｎ核四极共振自旋系统的自旋－晶格弛豫是一种双指数弛豫。
3)Nuclear Quadrupole Resonance核四极矩共振
1.A method of removing Radio Frequency Interference inNuclear Quadrupole Resonance detecting system is introduced.本文针对核四极矩共振探测系统中面临的NQR信号检测频率附近出现的射频干扰问题。
2.The acquirements for designing a digital nuclear quadrupole resonance spectrometer were analyzed.介绍了软件无线电技术的基本原理 ,分析了全数字化核四极矩共振谱仪的设计要求 ,讨论了设计时在软件、硬件方面的一些考虑 ,给出了基于软件无线电技术的全数字化核四极矩共振谱仪设计一个实
3.In previous studies we have developed a nuclear quadrupole resonance (NQR) for detection of explosives.介绍了核四极矩共振(Nuclear Quadrupole Resonance简称NQR)炸药检测系统的基本原理及检测过程中面临的如何消除激励脉冲信号拖尾对NQR检测信号的影响问题。
4)nuclear quadrupole resonance核电四极矩共振
1.The data processing of the explosive detection system based onnuclear quadrupole resonance;基于核电四极矩共振技术的爆炸物检测系统的数据处理及信号识别算法
5)NQR核电四极共振
1.Technology ofNQR detection;核电四极共振探测技术研究
6)nuclear guadrupole resonance核四极子共振
延伸阅读
核四极矩共振核自旋量子数I》1的原子核除有核磁矩μ外，还有电四极矩Q,它起源于原子核正电荷的非球对称分布。核的电四极矩Q可大于零或小于零,视核电荷分布循自旋轴方向延伸或压缩而定。 式中ρ(θ,r)为核电荷密度；r为由核的质心至体积元dτ的距离；θ为自旋轴z轴与r间的夹角。分子中具有电四极矩的原子核处往往存在电场梯度，四极矩 Q与这种不均匀电场间的作用能量是量子化的。在轴对称的电场梯度情况中，允许的能量为： 式中q为在核处的电场梯度,它取决于核周围的电荷分布，eqQ为核四极矩耦合常数，磁量子数mI可取I、I-1、...、-I+1、-I等值。对于±mI,EmI都相同,故对mI≠0的情况，能量或对应的能级是二重简并的，不同能级间可发生跃迁,并服从ΔmI±1的选择原则，当外加射频电磁波的频率v满足以下方程时：原子核就从射频电磁场吸收能量，从低能级跃迁至高能级，产生核四极矩共振。式中h为普朗克常数。核四极矩在不均匀电场中产生的简并能级还可因外磁场的作用引起进一步分裂。原子核在这些能级间的跃迁仍服从ΔmI＝±1的选择原则。
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