梯度场

为了获得位置信息以描绘出质子的空间分布图像，又利用通电线圈在主磁场的基础上叠加了三个梯度场。

In order to obtain the location information and depict a spatial distribution image of the proton , it needs three additional gradient magnetic field generated by the gradient coils .

我想说的是Stokes定理，如何帮助我们理解路径独立，它是如何，导出梯度场的准则。

So , one thing I want to say has to do with how Stokes helps us understand path independence , so , how it actually motivates our criterion for gradient fields .

利用高阶光滑流线函数法设计MRI柱面梯度场线圈

Design MRI Cylindrical Gradient Coil using Stream Function with High-order Smoothness

为什么要说F是一个梯度场？

F is a gradient field . Why ?

如果F是梯度场。

Say that it is a gradient field .

第三个等价性质是，F是一个梯度场。

The third one , it 's equivalent to F being a gradient field .

梯度场中荧光关联谱测量的MonteCarlo模拟

Monte Carlo Simulation of FCS in a Laser Gradient Field

图像梯度场的Gamma混合分布模型及其求解

Hybrid Gamma Distribution Model of Image Gradient Filed and Its Solution

这意味着，F是个梯度场，这是一样的。

And that means also it 's a gradient field . It 's the same thing .

用加脉冲梯度场的NMR自旋回波法测量高分子聚合过程中的自扩散系数

Self-Diffusion Coefficients of Polymer in Polymerization Measured with Pulsed Field-Gradient NMR Spin Echo Methods

应用脉冲梯度场NMR研究脂蛋白的自扩散系数分布

Study of diffusion coefficient distribution of lipoproteins by pulse-field-gradient ( pfg ) - nmr

低梯度场旧MR机型CE-MRA的临床应用体会

The clinical application of CE-MRA with old low gradient field MR system

回忆一下，我们知道，如果F是一个梯度场，那么它的旋度为零。

So , recall we 've seen if F is a gradient field & then its curl is zero .

对SPIRAL的梯度场波形、k空间分布以及网格重建算法进行了描述。讨论了偏共振效应对SPIRAL点传播函数的影响，以及在对该效应进行校正时积分面积大小的影响。

The factors , such as the off-resonance effect and gradient shape , which affect the quality of the SPIRAL imaging were discussed .

图形法运用可视化方法描绘了房价场的3D可视化模型、等高线图和梯度场线图。

One is the graphical representation by the visualization method , including the 3D mesh representation , the contour line graph and the field line graph .

以有限元法为理论基础，ANSYS软件为平台，建立铸件凝固过程的数学模型，对铸造凝固过程进行了温度场、温度梯度场和应力应变场的数值模拟。

The mathematic model in the solidification process of the cast is built up with finite element method and ANSYS software .

再强调一遍，设F是梯度场，接下来，我们可以得到什么？

So , just to put one more time this disclaimer , if F is a gradient field then what do we have ?

用在温度梯度场中析晶的方法制备了BaOTiO2SiO2系统的极性玻璃陶瓷。

Polar glass-ceramics in the BaO-TiO2-SiO2 have been prepared by crystallizing the glasses in a temperature gradient .

本文根据电化学治疗癌肿的机理，讨论了pH梯度场分布及电流密度分布的均匀性对治疗效果的影响。

Based on the mechanism of electrochemical treatment of cancer , the influence of the distribution of pH gradient and the uniformity of the distribution of current density on the treatment effect is discussed .

本文在梯度场磁泡传输法的基础上获得了测试小泡径材料矫顽力Hc的方法，得到了一个较普遍的计算梯度场的公式。

Based on the magnetic bubble propagation method in gradient field , a measuring method for the coercive force H in small bubble domain materials and a more general equation for calculating the gradient field are derived .

提出一种基于Sobel算子的梯度场平滑的方法求解块方向图。

A block direction calculation method was proposed , which used the gradient smoothness based on Sobel operator .

结合脉冲梯度场（PFG）的选择性形状脉冲的相位特性研究

A study of phase property of selective shaped pulses in combination with PFG

报道了利用自制梯度场系统进行的脉冲梯度增强的高分辨COSY实验。

The eddy-current effect caused by the gradient field was analyzed and a gradient-enhanced COSY experiment was also carried out to test this instrument .

本文简述了生物电磁学的发展概况，分析了磁共振成像（MRI）中由时变梯度场感应的涡流对人体外周神经刺激（PNS）和心脏刺激等生物效应机理。

This paper introduced the progress of bioelectromagnetics briefly , analyzed the biological effects mechanism , such as peripheral nerve and cardiac stimulated by the induced currents of transient magnetic fields in a MRI scan .

利用一个带有预饱和辐照的脉冲梯度场匀场序列来提高具有多重强峰的样品在Z轴方向高阶匀场的质量。

A shimming pulse sequence combined with a pre - saturation irradiation is proposed for the first time to improve the quality of high - order shimming in the Z direction when a sample has multiple strong peaks .

对磁共振成像（MRI）的安全性进行了综述，主要涉及五个方面：静磁场、梯度场、射频场、噪声和造影剂。

Safety of MRI for both patients and employees is reviewed . The safety concerns and considerations of exposure to static magnetic fields , radio frequency fields , switching magnetic field gradients , acoustic noise and image enhanced contrast agents are described .

最后，在Hilbert空间上的C~2实值函数有紧梯度场的假设条件下，给出了文[2]中的三临界点定理的一种加强形式。

Finally , under the condition that C2 real function defined on Hilbert space has the compact gradient field , a strenthening form of the three critical points theorem in 〔 1 〕 is given .

运用时域有限差分法（FDTD），通过电磁场对人体心脏影响的模型仿真，计算出心脏体段由磁共振成像（MRI）时变梯度场感应的涡流，并与已有的心脏刺激阈值进行比较。

By employing FDTD method and simulating the effects of electromagnetic on the heart of human body , the eddy-currents of the heart of human body induced by MRI time-varying gradient fields are computed and compared with the recommended threshold .

提出了一种分别基于Poincare指数和梯度场零点检测的分级算法来提取奇异点（核心点，三角点）。

On the basis of Poincare Index and zero point-detection of gradient field , a hierarchy algorithm for detecting singular point ( core and delta ) was proposed . It was divided into two stages .

本文应用一个CISK机制的扰动模式，从理论上分析了环境温度梯度场对台风等对流性扰动发展和移动的影响。

Applying the theory of CISK to a two-level model , the effects of environment temperature gradient on the development and movement of tropical disturbances were analysed .