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Simulation of a relatively simple process shimming of shimming algorithm validation.

仿真了比较简单的匀场过程，对匀场算法进行验证。

Methods The ferromagnetic ring is displaced by magnetic ring and the shimming effect is discussed.

用磁性材料代替常用的铁磁材料作为极面上的匀场环，并讨论匀场效果。

The experiment results show that this method can effectively guide passive shimming work and obtain highly homogeneous magnetic field.

该算法能够准确算出匀场磁片的校正位置及使用数量，有效地指导无源匀场工作。

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。

Thus, it is very tedious to realize passive analytical shimming. In addition, the harmonic fields above the fifth order can't be compensated by passive analytical shimming.

鉴于解析匀场的上述不足之处，本文提出了无源数值匀场的概念，目的在于寻求一种高水平、低成本、简单易行补偿B〓的方法。

It was proved through experiment that optimum passive numerical shimming can achieve a high level in superconducting NMR imaging magnets and it can be realized very easily and very economically. Field regression is not absolutely necessary in the technique of optimum passive numerical shimming, but it is useful to know the structure of the field error Bz'.

磁场回归在超导核磁共振成像主磁体的无源数值匀场技术中虽然并不是绝对必需的，但在对主磁体进行无源数值匀场时，如能知道成像空间内不均匀磁场的磁场偏差B〓的结构，也是非常有用的。

Active shimming design The magnetic field homogeneity will descend when temperature changes. Generally, active shimming is used to re-correct magnetic field.

4匀场线圈设计当外界温度发生变化时成像磁场的均匀性会随之改变，通常采用有源匀场方法对磁场进行再校正。

After the model is established, shimming magnet becomes rapidly and accurately. The ferromagnetic shim needn't be tried many times and aimlessly.

该模型建立之后，可以快速、准确地匀场，使无源匀场不再盲目得进行多次尝试，一次就能使判断准确。

Active shimming designThe magnetic field homogeneity will descend when temperature changes. Generally, active shimming is used to re-correct magnetic field.

4匀场线圈设计当外界温度发生变化时成像磁场的均匀性会随之改变，通常采用有源匀场方法对磁场进行再校正。

I, Shannon Blood Sausage. Stand-pig small intestine washed first with warm water to soak rice for half an hour, picked up the rice, adding blood, mix with the rice and put into a large stone or blood beater, then add green onion, salt, has been Net diesel refining pig, star anise powder mix, wash the pig has been poured into the small intestine, ligated at both ends into the pot, cook the back, pay attention to the fire can not be too fast and can not boil water, to keep turning in order to avoid open rupture Blood Sausage, and come to naught, cooked to salvage, you can cut consumption, increase can also be cooked pan fried dishes, the use of soy sauce, vinegar, monosodium glutamate pair of points is expected, it is delicious, Miao can not be made.

一、香血肠。将猪小肠洗净备用，先用温水将大米浸泡半个小时，捞起白米，加入猪血，与米搅匀，放入大石磨或打浆机磨成血米浆，再加入葱花、盐、已炼的猪网油渣、八角粉等拌匀，灌入已洗净的猪小肠中，结扎两端，放入锅内，慢火煮熟，注意火不能太猛，水不能烧开，要经常翻动，以免血肠破裂开，而前功尽弃，煮熟后捞起，即可切块食用，也可用菜锅加熟油煎后，用酱油、醋、味精配成的点料，更是味香可口，妙不可言。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。