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横向弛豫
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  transverse relaxation
     A heavy water solution contained about 0.3M NH_4Al(SO_4)_2 is used as a solvent, whichmake the active hydrogen in the solution be exchanged, so that the time T_2 of the waters. transverse relaxation in the solution is reduced, and the signal of water in the solution can bedepressed or eliminated by the method of C.
     大约0.3M的NH_4Al(SO_4)_2的重水溶液用作溶剂而令其活泼氢交换,结果水的横向弛豫时间T_2缩短,可用C.
短句来源
     The envelopes of the ~(129)Xe free induction decay (FID) and the spectral lineshape have been theoretically simulated, in the presence of both the transverse relaxation and the radiation damping with different pulse flip angles.
     理论上,拟合得到激光极化液态~(129)Xe的辐射阻尼时间常数,并模拟了在不同脉冲反转角的激发下,当横向弛豫和辐射阻尼相互竞争时,自由感应衰减(Free Induction Decay, FID)信号包络和谱图线形的变化。
短句来源
     Simultaneous Measurements of Transverse Relaxation Time and Self-diffusion Coefficient of Intermolecular Multiple Quantum Coherences in NMR
     一种同时测量分子间多量子相干横向弛豫时间和自扩散系数的快速方法
短句来源
     With HSQC technique,the transverse relaxation time T_(2) was determined for certain carbon nuclear on the molecule of Omeprazole in two solvent systems.
     利用HSQC技术对2种溶剂体系下奥美拉唑(Omeprazole)分子中特定碳原子的横向弛豫时间T2进行了测定.
短句来源
     MR imaging characteristics and transverse relaxation time measurements in growth cartilage:experimental study
     正常生长软骨MR表现特征和横向弛豫时间测定实验研究
短句来源
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  lateral relaxation
     NMR lateral relaxation time ( T2 ) distribution can integrally reflect pore structural information, and logging information has vertical continuity, so there is a possibility and a necessity for studying the quantitative correlations between NMR T2 distribution and pore structural parameters, a quantitative study is performed on the pore structure by using NMR T2 distribution from 2 regions.
     核磁共振测井横向弛豫时间(T2)分布能够很好地反映孔隙结构信息,而且测井信息具有纵向连续性,所以研究核磁共振T2分布与孔隙结构参数之间的定量关系有其可行性和必要性。
短句来源
     The new NMR method is used to describe characteristics of lateral relaxation in the low resistivity cores, which has proved that oil and water can be identified according to the shapes of T_2 distribution spectrum and the average value of T_2.
     利用核磁实验新方法研究了低电阻率油层岩心的NMR横向弛豫特性,证实可根据T2谱形和T2平均值来判别岩石含油或含水。
短句来源
  longitudinal relaxation
     3. A series of MR images, which are formed by standard spin-echo imaging method and weighted by rotating-frame intermolecular double-quantum longitudinal relaxation T1ρ,DQ, were obtained when using on-resonance spin-locking pulse.
     此方法提供了两个有效参数可以调节弛豫时间,从而有效控制图像对比度。 结果分析表明,该对比度与传统分子间双量子横向弛豫加权完全不同,也区别于共振条件下的T1ρ,DQ加权成像。
短句来源
     Using important parameters such as NMR-chemical shifts, longitudinal relaxation time and transverse relaxatioa time, it is possible to probe the metabolic processes as well as conformation, concentration, transportation and distribution of reacting and resulting substances.
     利用NMR的重要参数——化学位移、纵向弛豫时间及横向弛豫时间,可以对代谢过程和反应物及产物的结构、浓度、输运和分布等进行观测和跟踪。
短句来源
     ith the optical Bloch equation and the density-matrix equations,the saturation effect of signal intensity has been studied for resonance degenerate four-wave mixing(DFWM)of two level system,and the signal intensity saturation behavior is obtained as a function of pump field intensity. The value of. the saturation pump intensity is determined by longitudinal relaxation time T1 and transverse relaxation time T2.The theoretical result coincides with experimental result.
     本文由光学Bloch方程和密度矩阵方程出发,研究了二能级系统共振型简并四波混频(DFWM)的饱和效应,给出了DFWM信号强度与泵浦光强度的函数关系.饱和泵浦光强的大小取决于纵向弛豫时间T1和横向弛豫时T2.对理论结果与相应实验进行了比较,表明二者符合得很好.
短句来源
     (2)The longitudinal relaxation time T 1 with RF irradiatoin is shorter than that without RF irradiation,while the transverse relaxation time T 2 with RF irradiation is longer than that without RF irradiation. (3)With the growth of RF irradiation,T 1 is reduced,while T 2 is increased.
     2 )在射频场的照射下 ,同核体系的纵向弛豫时间T1 小于无射频场时的T1 ,而横向弛豫时间T2 大于无射频场时的T2 .3)纵向弛豫时间T1 随射频场的增强而逐渐减小 ,横向弛豫时间T2 随射频场的增强而逐渐增大 .
短句来源
     A mathematical formula of the relation between longitudinal relaxation or transverse relaxation and the flip angle of magnetization vector was deduced and its programme was designed.
     首先推导出纵向弛豫和横向弛豫与磁化强度矢量偏转角关系的数学表达式.
短句来源
  “横向弛豫”译为未确定词的双语例句
     Inversion analysis of pulsed NMR transverse-relaxation signals in low field
     低场脉冲NMR横向弛豫信号的反演分析
短句来源
     T2 measurements in the lumbar spine don't showed Significant difference(p=0.0812).
     研究组与对照组的MRI有效横向弛豫时间(T2*)的差别无显著性(P=0.0812);
短句来源
     It is believed that the system is in the slow motion limit, since the T 1/T 2 ratio is very large.
     同时 ,根据1 1 9Sn 1DNMR信号的线宽估测了有效横向弛豫时间 (T 2 ) ,并由T1 /T 2 推断在所研究的体系中分子的运动属NMR慢运动极限 .
短句来源
     and Dn. Experimental results of T2 measured by the pulsesequence are accordance with those measured by CPMG pulse sequence.
     实验证明,利用该脉冲序列测量的单量子相干横向弛豫时间T_(2,1)与利用CPMG脉冲序列测量的横向弛豫时间T_2基本一致。
短句来源
     A simple method capable of simultaneously measuring characteristic parameters of absorption media, such as trasversal relaxation time T2, small-signal absorption coefficient a0 and saturation intensity Is, is presented.
     提出了一个能同时测定横向弛豫时间T_2,小信号吸收系数α_0和饱和光强I_(?) 等吸收介质特征参量的简单方法.
短句来源
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  transverse relaxation
The NMR nutation signals in glycerin were studied for 10?ω1T2?150, where ω1=γH1, with γ the gyromagnetic ratio and H1 the amplitude of the magnetic component of the radio-frequency field, and T2 is the transverse relaxation time.
      
General Hasegawa-Bloch-type equations are applied to describe certain experimental data concerning the shape and the width of EPR lines and the longitudinal and transverse relaxation rates.
      
The longitudinal and transverse relaxation rates of 19F nuclei in Pr2CuO4-xFx (x=0.20) samples are measured at high temperatures (150 K>amp;lt;T>amp;lt;600 K).
      
The transverse relaxation time was measured for these cells at the same temperature: T2=0.72,1.1, and 1.4 s, respectively.
      
Two peaks are observed at T=35 and 47 K in the transverse relaxation rate for Cu(2) nuclei in YBa2Cu3O7-y.
      
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  lateral relaxation
The lattice mismatch leads to (lateral) relaxation of thicker CaF2 film close to substrate steps.
      
Only in Semb's extra-fascial apicolysis both vertical and lateral relaxation known as concentric relaxation is obtained.
      
Plane view of the 0001 surface of neutral alumina showing the lateral relaxation within the topmost O plane.
      
The periodic slab used was 9 atomic layer in thickness and no lateral relaxation was allowed during geometry optimization.
      
  longitudinal relaxation
The characteristic longitudinal relaxation time and the transverse conductivity, which are determined by scattering at excited donors in the presence of the hybridization of states, are calculated.
      
We also evaluate the longitudinal relaxation time and the spectrum of the complex-valued magnetic susceptibility.
      
Experimental investigation of the longitudinal relaxation time of electronic polarization of the ground state of potassium atoms
      
We report the results of an experimental investigation of the longitudinal relaxation time T1 of the electronic polarization of the ground state of potassium atoms in cells with an antirelaxation coating on the walls.
      
These are the longest longitudinal relaxation times ever recorded in coated cells.
      
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By utilizing the method of correlation function (theory of Kubo), the ferrimagnetic resonance behaviour of the tight exchange coupled system was discussed. The general formulae of the magnetic susceptibility tensor were given, from which the resonance field H0 (or resonance frequency) and the line width 2△ωof the ferromagnetic branch and that of the exchange branch were determined. The results obtained show that the so-called fast relaxation and slow relaxation mechanisms are nothing but two branches (the transverse...

By utilizing the method of correlation function (theory of Kubo), the ferrimagnetic resonance behaviour of the tight exchange coupled system was discussed. The general formulae of the magnetic susceptibility tensor were given, from which the resonance field H0 (or resonance frequency) and the line width 2△ωof the ferromagnetic branch and that of the exchange branch were determined. The results obtained show that the so-called fast relaxation and slow relaxation mechanisms are nothing but two branches (the transverse branch and the longitudinal branch) of the ferromagnetic resonance. The transverse branch corresponds to the coupled motion between the transverse components

本文利用关联函数的方法(久保理论),讨论了强交换耦合系统的亚铁磁共振,给出了系统总磁化率张量的一般表达式,由此可以定出铁磁支与交换支的共振场H_0(或共振频率)和峯宽2△ω。所得结果表明,所谓快弛豫及慢弛豫机理不过是铁磁共振的两个分支(横分支与纵分支)。横分支相应于J及S的横向磁矩之间的耦合运动J,S分别为希土离子及铁离子的磁矩),而纵分支相应于J的纵向分量与S的横向分量之间的耦合运动。 由于晶场及各向异性交换场的作用,J的量子化方向与S的量子化方向偏离一个角度φ。此外由于交换作用的各向异性,在交换作用哈密顿J.λ.S中,张量λ的非对角元可以相当大。结果表明,纵分支对峯宽的贡献近似地正比于φ~2及λ_(i3)(i=1,2)。 根据2△ω的一般表达式,在极低温下(4.2°K以下),峯宽主要是由横分支决定的。沿某些晶轴方向,当希土离子最低两个能级接近“交叉”时,共振场及峯宽应该出现反常峯值,这在实验上已经得到了证实。当温度升高时,纵分支将逐渐“压过”横分支。当纵向弛豫频率达到高频场的频率ω时,峯宽将出现极大值,一般实验中观察到的就是这个极大值。当温度继续升高时,横分支又将起主要作用。当横向弛豫频率接近...

本文利用关联函数的方法(久保理论),讨论了强交换耦合系统的亚铁磁共振,给出了系统总磁化率张量的一般表达式,由此可以定出铁磁支与交换支的共振场H_0(或共振频率)和峯宽2△ω。所得结果表明,所谓快弛豫及慢弛豫机理不过是铁磁共振的两个分支(横分支与纵分支)。横分支相应于J及S的横向磁矩之间的耦合运动J,S分别为希土离子及铁离子的磁矩),而纵分支相应于J的纵向分量与S的横向分量之间的耦合运动。 由于晶场及各向异性交换场的作用,J的量子化方向与S的量子化方向偏离一个角度φ。此外由于交换作用的各向异性,在交换作用哈密顿J.λ.S中,张量λ的非对角元可以相当大。结果表明,纵分支对峯宽的贡献近似地正比于φ~2及λ_(i3)(i=1,2)。 根据2△ω的一般表达式,在极低温下(4.2°K以下),峯宽主要是由横分支决定的。沿某些晶轴方向,当希土离子最低两个能级接近“交叉”时,共振场及峯宽应该出现反常峯值,这在实验上已经得到了证实。当温度升高时,纵分支将逐渐“压过”横分支。当纵向弛豫频率达到高频场的频率ω时,峯宽将出现极大值,一般实验中观察到的就是这个极大值。当温度继续升高时,横分支又将起主要作用。当横向弛豫频率接近相应于希土离子最低两个能级之间的间距ω_(21)时(h=1),峯宽将出现第二个极大值。?

The method used in Ref. [3] to treat the magnetic susceptibility of the coupled system was extended to analyse the spin-lattice relaxation processes. In the case of weak coupling, the detailed expressions for the line shape of longitudinal nonresonance absorption and transverse resonance absorption were obtained by solving a set of coupled equations. The longitudinal and transverse relaxation times have been obtained as functions of the external alternating field. This is the direct consequence of the fact that...

The method used in Ref. [3] to treat the magnetic susceptibility of the coupled system was extended to analyse the spin-lattice relaxation processes. In the case of weak coupling, the detailed expressions for the line shape of longitudinal nonresonance absorption and transverse resonance absorption were obtained by solving a set of coupled equations. The longitudinal and transverse relaxation times have been obtained as functions of the external alternating field. This is the direct consequence of the fact that the equations we used are of the non-Markovian type. Far away from the resonance point, the actual expression of the line shape is found to be quite different from that of the Debye or Lorentz type; the non-Markovian effect generally can not be ignored.

本文讨论了工作中决定耦合系统磁化系数的方法,并用来分析自旋-晶格弛豫过程。在弱耦合的情况下,得出了决定磁化系数的耦合方程组,并求出纵向非共振吸收和横向共振吸收线型的表达式。得出的纵向和横向弛豫时间是外加交变场频率的函数,这反映了高频场对弛豫的影响是由于所用密度矩阵方程为非马尔科夫型的直接结果。在远离共振点处,所得的线型公式和德拜型或洛仑兹型差别较大。一般说来,非马尔科夫效应是不能忽略的。 在自旋S=1的情况,我们系统地分析了纵向及横向弛豫的基本过程。其中包含与通常讨论的过程相应的项,如单声子过程,Raman过程,Orbach过程等等,但现在都有外加交变场频率ω参与进去。最后讨论了声子的寿命对横向弛豫时间的影响。

The lifetime of atoms and molecules can be measured by using modulated resonant single-mode laser field. A theoretical mode for this method is presented. It is shown that the laser induced fluorescence, a resonance flourescence is modulated at the same frequency, but phase shift from the exciting laser. The phase shift is mainly due to three processes (1) coherent excitation process characterized by transverse relaxation rate and line width of the laser, (2) population damping process characterized by the decay...

The lifetime of atoms and molecules can be measured by using modulated resonant single-mode laser field. A theoretical mode for this method is presented. It is shown that the laser induced fluorescence, a resonance flourescence is modulated at the same frequency, but phase shift from the exciting laser. The phase shift is mainly due to three processes (1) coherent excitation process characterized by transverse relaxation rate and line width of the laser, (2) population damping process characterized by the decay time of excited levels and other populated levels, (3) collision process characterized by the relaxation time by which the system to be in equilibrium state. The effect of these processes on measurement result is discussed. The Doppler broading is considered also.

本文从理论上分析了利用调制的单模激光场共振激发来测量原子或分子的寿命.结果表明:感生荧光或共振荧光信号与调制信号间的相移主要来自三个过程:(1)由原子的横向弛豫时间及激光线宽决定的激发过程;(2)由激发能级及其他能级上粒子数衰减过程;(3)与系统达到平衡态粒子数分布所需的弛豫时间有关的碰撞激发过程.讨论了在不同的情况下它们的影响,并在分析中考虑了多普勒加宽的影响.

 
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