研究人员发现，铬元素的氧化物由六价铬转变为三价铬，这与画作中的铬黄色日趋变暗有关。
The researchers found that a change in the oxidation state of the element chromium (from chromium 6 to chromium 3) was linked to the darkening of chrome yellow paint.
通过对贵金属、金属氧化物和六铝酸盐等催化剂应用于二甲醚催化燃烧的比较，发现六铝酸盐最具研究应用前景。
It was found that hexaaluminate was a promising catalyst for dimethyl ether catalytic combustion, superior to other catalysts such as noble metal and metal oxides.
分别测定了六种不同组分的过渡金属氧化物催化剂的初活性。
The initial activities of six catalysts with different compositions of transition metal oxides were measured by this technique.
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