downwards concave 中文意思是什麼
downwards concave
解釋
向下凹的-
The reversible temperature coefficient of magnetic flux of ndfeb - ferrite composite bonded magnets as a function of the content of ferrite is concave downwards, and that of ainico - ferrite magnets as a function of the content of ferrite is convex upwards, the reversible temperature coefficient of magnetic flux of the other four binary composite bonded magnets and its single component follow the pattern of linear relationship
釹鐵硼和鐵氧體復合粘結磁體的磁通可逆溫度系數與鐵氧體含量的關系曲線下凹，鋁鎳鈷和鐵氧體復合粘結磁體的磁通可逆溫度系數和鐵氧體含量的關系曲線上凸，其餘四組復合粘結磁體的溫度系數隨著單一磁粉含量變化基本呈直線關系。
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