To obtain a constant gradient magnetic field outside unilateral nuclear magnetic resonance (NMR), optimal design method based on finite element method (FEM) and topology optimization is proposed.
为了在单边核磁共振仪器外产生梯度恒定的磁场，提出利用基于拓扑优化和有限元法的优化设计方法。
The design process: marking traditional and modern style, gradient colors, from inside to outside light, as the rising sun, reflecting its value.
设计过程：标志传统加现代风格，渐变的颜色，由里到外发光，如同升起的太阳，体现出其价值。
The developing level of the technology of producing in-situ gradient composites in outside force field (centrifugal method and electromagnetic separation method)has been reported.
综述了利用外力场（离心铸造法和电磁分离法）制备自生梯度复合材料的研究现状。
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