Method: Morphological identification and differential thermal analysis (DTA).

方法：形态鉴定及差热分析法。

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Methods: Morphological identification and differential thermal analysis (DTA).

方法：形态鉴定及差动热分析法。

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Differential thermal analysis did not reveal the ammonium perchlorate phase change from rhombic to cubic.

差热分析没有测出过氯酸铵从正交晶向立方晶的相变。

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That meant recruiting two clever instruments with long-winded names a differential scanning calorimeter, which measures the thermal properties of the mixture as it is sorted, and a nuclear-magnetic resonance spectrometer, which measures its chemical properties.

ECONOMIST: Flights of fancy