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调制DSC的基础：调制DSC信号的校正及计算
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ABSTRACT This monograph reviews the principles of Modulated DSC and provides an understanding of the calculation and calibration of the various signals used in MDSC. INTRODUCTION As discussed in the initial overview of this series on MDSC (1), Modulated DSC differs from standard DSC in that it applies two simultaneous heating rates to the sample. The linear or average heating rate provides the same information (Total heat flow rate) as standard DSC, while the sinusoidal (modulated) heating rate is used to determine the fraction of the Total heat flow rate that responds to a changing heating rate. In general, this heat flow rate is caused by heat capacity (Cp), changes in heat capacity, and by most melting. This fraction of the Total heat flow is called the Reversing heat flow or the heat capacity component of the Total heat flow. Heat flow that does not respond to the changing heating rate is determined by subtracting the Reversing signal from the Total signal. This difference signal is called the Nonreversing heat flow or the kinetic (time-dependent) component. Although DSC instruments measure the rate of heat flow, for the purpose of simplicity "Heat Flow" will be used in place of "Heat Flow Rate" in the remainder of this paper. |
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2017-02-17 09:40:19, 508.54 K
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