Knowledge organization

Knowledge organization

A field of study invloving the indexing and classification of knowledge that is usually performed in libraries, databases and archives etc. It is related to Library and Information Science(LIS).

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阿爾法粒子

Energy; Nuclear energy

帶正電荷的離子從某些放射性元素的原子核自發地彈出。它是一個有品質數的 4 + 2 的靜電荷的氦核相同的。它具有低的穿透力和距離很短（空氣中幾釐米）的。最高能 α 粒子將通常不能穿透的細胞覆蓋皮膚，死了的圖層，可以輕鬆地停下來的一張紙。Alpha 發光的同位素是身體內部時，Α 粒子都是危險的。 ...