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central transition
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  中心跃迁
     Under the condition of finite pulse width, using a vector model and computer simulation, the present paper proposed a composite 180 pulse: 45 112. 5 45, for uniform population inversion in the central transition of spin-3/2 nuclear systems.
     在有限脉冲宽度条件下,本文利用矢量模型与计算机模拟设计了一个组合180°脉冲:45°_x112.5°_y45°_x,可以均匀地将自旋I=3/2核体系中心跃迁的布居数反转。
短句来源
     POPULATION INVERSION OF THE CENTRAL TRANSITION OF SPIN-3/2 NUCLEAR SYSTEMS IN POWDER SAMPLES
     粉末样品中自旋3/2核体系中心跃迁的布居数反转
短句来源
     Spin-locking o f central transition in half-integer quadrupolar systems was studied. The particles which occupy the states of |-1/2> and |l/2> may form an isolated sub-system, and it obeys the spin temperature theory in rotating frame. We calculated the intensity of spin-locking signal by density operator approach.
     本文研究了半整数四极体系中心跃迁的自旋锁定,认为占据|-1/2>与|1/2>态的粒子可构成一个孤立的子体系,用密度算符理论证明了旋转坐标系自旋温度理论在这子体系中仍适用。
短句来源
     We show that the luminescence has mainly two emission peaks:on e peak corresponds to the red shift relative to the central transition frequency and the other to the blue shift.
     理论结果表明 :非定域激子复合发光具有双峰特征 ,两峰相对于中心跃迁频率的红移和蓝移量与电子和空穴的振荡频率密切相关 .
短句来源
     MULTIPLE EXCITATION IN THE CENTRAL TRANSITION OF HALF-INTEGER QUADRU- POLAR NUCLEI IN SOLIDS
     半整数四极体系中心跃迁的多次激发NMR谱(英文)
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  “central transition”译为未确定词的双语例句
     NMR ECHO SEQUENCE IN THE CENTRAL TRANSITION OF SPIN-3/2 QUADRUPOLAR SYSTEMS IN POWDERED SAMPLES
     自旋3/2粉末样品四极核中心跃迁的NMR回波序列
短句来源
     When the average rf field strength ω_c (in rad. s~(-1)) satisfies the condition ω_q/ω_e<1/5, measurement of central transition results in a line which locates at ωc/(2π);
     在梳伏脉冲的平均射频汤强度ω_e(以弧度·秒~(-1)为单位)满足ω_q/ω_e<1/5时,测量中心线所得的谱,位于频率ω_e/2π处;
短句来源
     A pulse sequence 45x°t1-90±y°t2 is proposed for the spin echo of I = 3/2 spin systems in powder samples , which is confirmed theoretically and experimentally . It can effectively refocuse the magnetization of the central transition in spin-3/2 quadrupole nuclear systems . And the numerical calculated excitation bandwidth of the echo sequence is also given .
     本文提出脉冲序列45_X~°—t_1—90_(±Y)~°—t_2,从理论和实验上证实了它能够有效地会聚粉末样品中I=3/2四极核中心跃迁的磁化矢量,并对该回波序列的激发谱宽作了数值计算。
短句来源
     The calculation of spin diffusion rate is demonstrated with two typical cases: a spin-1/2 pair and the central transition of a spin3/2 pair.
     接着以丰核环境中相互偶合的自旋-1/2系统以及自旋-3/2系统为典型列举了自旋扩散速率的计算。
短句来源
     HIGH-RESOLUTION NMR SPECTROSCOPIC STUDY ON THE CENTRAL TRANSITION OF SPIN-3/2 QUADRUPOLAR NUCLEI IN POWDERS
     粉末样品自旋3/2四极核中心跃迁的高分辨核磁共振谱
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短句来源
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短句来源
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短句来源
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  central transition
Variation of relaxation timet1 with crystal orientation for the central transition of Fe3+/MgO revealed two minima that were explained as due to crossrelaxation mechanisms.
      
Data for terbium NMR (central transition) in Tb-Y alloys are presented.
      
The central transition of I=3/2 perturbed by the second order quadrupole effect is usually observed by highresolution NMR apparatus.
      
Perturbation theory for a low and numerical calculations for a high standing wave intensity give qualitative agreement with experiment and substantiate the nature of the central transition.
      
We report here a method that allows one to correlate the first-order quadrupolar spectrum with the central transition in a two-dimensional experiment.
      
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Taking the effect of centre symmetric ligand field into account, we have proposed 3d-radial wave function which is in the bound state and consists of different bases. The crystalline spectra of some complex compound ions are calculated by using this wave function. If the suitable boundary conditions are considered, we can input a parameter and get the result in agreement with the experimental crystalline spectra. The essence of our method is that, on the base of the crystal field model for point charge, the...

Taking the effect of centre symmetric ligand field into account, we have proposed 3d-radial wave function which is in the bound state and consists of different bases. The crystalline spectra of some complex compound ions are calculated by using this wave function. If the suitable boundary conditions are considered, we can input a parameter and get the result in agreement with the experimental crystalline spectra. The essence of our method is that, on the base of the crystal field model for point charge, the effect of molecule orbit is considered partly for the centrally symmetric field of coordination bodies. This mix bases wave function which is suggested by us applies to all central transition metal ions of complexes which have suitable symmetry, If the interactions between the valence electrons of metal ion are omitted, this mix bases single electron 3d-radial wave function can be used to calculate molecular trajectory as well.

考虑中心对称配体场影响,提出一种不同基混合的束缚态过渡金属离子的3d径向波函数。利用这种波函数,计算了一些Cu~(++)络离子的晶场谱。假设适当的边界条件,用一个拟合参数,就能得到和实验一致的结果。这种方法的实质在于,在晶体场静止点荷模型基础上,考虑了诸配体等效中心对称场的部份分子轨道效应。这种混合基单电子3d径向波函数也能用于完全的分子轨道理论计算。

The basic procedure for the digital calculations of the po-vier pattern has been introduced. As a premise of computer simulations a mathematic formula' tion withmore synthesis and universality has been deduced. Following considerations are accepted in our program the weight treatment of the combination of absorptions of all transitions resulting in the total spectrum, the fluctuation of the quadrupole interaction gives rise to a broadening of single lines, this effect delivers different effects to the central...

The basic procedure for the digital calculations of the po-vier pattern has been introduced. As a premise of computer simulations a mathematic formula' tion withmore synthesis and universality has been deduced. Following considerations are accepted in our program the weight treatment of the combination of absorptions of all transitions resulting in the total spectrum, the fluctuation of the quadrupole interaction gives rise to a broadening of single lines, this effect delivers different effects to the central transition and satellites. It is emphasized that a set of parameters describing the resonance absorptions are obtained by an optimum fit with the all-over pattern and the coincidence of those shifting behaviours of characteristic peaks as the external field changing.

介绍粉末谱数值计算的基本手续。推导了更具综合性和普适性的数学形式,作为计算机拟谱的前提。陈述程序中的若干考虑:所有跃迁吸收合成总谱时的权重处理,四极矩作用的涨落对单线展宽有贡献,而且这种效应对中心跃迁及伴线的影响各不相同。强调一套描述共振吸收的参数获得是基于对全谱型的最佳拟合以及在场强变化情况下各特征峰移动行为的符合。

The computer simulation method of the solid powder pattern in the presence of anisotropic chemical shift effect and nuclear electric quadrupole interaction is presented. The computer program was designed for the powder pattern of the central transition of nuclei with half-integral spin. The "noise" and error in the simulation spectra as well as the spectra simulation procedure were analysed.

文本介绍了存在各向异性化学位移效应和电四极矩相互作用时,自旋为半整数核的固体NMR中心跃迁粉末谱的计算机拟合方法,讨论了谱拟合步骤和模拟谱中的“噪声”和误差。

 
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