磁体

Homogeneous magnetic field is necessary in NMR magnet. In general shimming magnetic field is by experience. So it's difficult to shim. It depends on experiences frequently.

针对核磁共振永磁体的磁场传统匀场方法难度大，经验依赖程度高的情况，提出了人工神经网络应用于磁场匀场的手段。

In MRI system, magnet system is the main part that generates imaging magnetic field. Its performance is an important factor to affect image quality. Therefore, the research on methods for magnet system has important theoretical and applied values. Magnet system is mainly composed of magnet and shimming component.

在磁共振成像设备中磁体系统是一个重要的组成部分，负责产生均匀静磁场，为磁共振成像提供基础物理环境，其性能的优劣是决定磁共振图像质量的重要因素，也是衡量整个成像系统性能的主要参考指标，因此具有重要的研究意义。

To improve the magnetic field homogeneity, therefore, a cylinder magnet from several crescent-shaped magnets is presented.

为此，采用一种具有磁化方向近似线性分布的离散新月形磁块构成圆柱形磁体以改善二极磁场的均匀度。

The super fragment separator of the FAIR project (facility for antiproton and ion research) consists of two superconducting coils.

国际反质子与离子大科学工程项目中的超导super-FRS磁体包含2个超导线圈，最大磁场为1.6 T，这样大的磁场必然产生很大的电磁力。

When preset heating rate is 2000℃/s and pretreated compact of NdFeB alloys is sintered at 1000℃for 8min, densified magnet is obtained.

当预设升温速度为2000℃／s时，经过预处理的NdFeB合金压坯在1000℃×8min的电场烧结后，即可得到较致密的烧结磁体。

When preset heating rate is 500℃/s and the non-pretreated NdFeB alloy compact is sintered at 600℃, relatively densified compact can obtain.

未经预处理的NdFeB合金生坯当预设升温速度为500℃／s时，在600℃的低温即可使压坯基本烧结致密化，磁体中白色富Nd相的分布既很均匀也很弥散。

The fundamental magnetic entities are magnetic dipoles.

基本的磁体是磁偶极子。

Firstly, the incommensurate magnetic scattering of the doped single-layer triangular lattice in the normal state has been studied. It is shown that away from half-filling the commensurate peak is replaced by six incommensurate peaks located at [ (1-δ〓), ] , [ (1-δ′〓), ] , [ (1-δ"〓), ] , respectively, and 〓〓. The incommensurability parameter δ increases with doping at lower doping concentration, while saturates at higher dopings. These peaks broaden and weaken in amplitude with increasing energy and temperature, with the positions of the incommensurate peaks not changing with the energy.

利用t-J模型，讨论了单层和双层三角晶格材料的非公度磁散射，结果表明：随着掺杂的增加，三角晶格反铁磁体出现公度-非公度转变，即由一个公度峰变为六个非公度峰，并且非公度率在较低掺杂时随着掺杂浓度的增大而增大，在较高掺杂浓度时将达到饱和；虽然非公度峰的权重随着能量的增大而减小，但非公度峰的位置与能量无关，即非公度率是不随能量变化的，并且我们还发现非公度峰的权重随着温度的升高也是减小的。

PURPOSE: To investigate the stability and effective working distance of integrated forces induced by high quality magnet and elastics in orthodontic fixed appliance.

目的：分析与托槽大小相近的高性能固定矫治用磁体与橡皮圈形成的组合力的稳定性及有效工作距离。

Then place the magnet between both fascias.

然后把磁体置于两瓣铜线之间。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。