尚未登入 請由此登入
 
 
 










知識分享平台Eshare檢視資訊View
返回前一頁Back
      [檢舉]

標題Title: Measurement of heat capacity by fitting the whole temperature response
作者Authors: 林開政,Jih Shang Hwang..等
上傳單位Department: 機械工程系
上傳時間Date: 2010-6-30
上傳者Author: 林開政
審核單位Department: 機械工程系
審核老師Teacher: 林開政
檔案類型Categories: 論文Thesis
關鍵詞Keyword: heat capacity, calorimeter
摘要Abstract: A new method that fits the whole temperature response of a heat-pulse calorimeter for heat capacity
is developed. Analyzing the thermal response of a heat-pulse calorimeter on a model that was used
by the relaxation method, the authors derived some useful relations and further utilized the numeric
method of the general linear least squares to determine the heat capacity of a sample. Absolute
accuracy of the proposed method was verified by determining the heat capacity of a 0.249 76 g
copper sample ~purity 99.999%! on a self-designed and fully automated calorimetric system from
4.5 to 80 K. Comparing the result with the literature, the deviation in average was 1.2% from 4.5
to 20 K and 2.0% from 20 to 80 K. It is found that the proposed method is capable of measuring heat
capacity regardless if the sample is adiabatically or nonadiabatically isolated. The size of the
specimen is not critical for the application of the method and the temperature range of measurement
can be expanded. It also deals with the t2 effect. Details of the employed calorimetric system are
described. Stability, inherent limitations, and further improvement of the system are also discussed.

檔案名稱
FileName
檔案大小
Size
檔案格式
Format
瀏覽次數
Browses
下載次數
Downloads
2010_6_4bab4a50.pdf 193Kb pdf 413 497
文件中檔案:
 

開啟檔案Download
 
 
返回前一頁