文献题目如下: 1、Determining the solar heating of swimming pools by the utilizability method. 2、On the random nature of solar radiation . 3、Solar radiation utilizability. 4、The probability density function of the clearness index: A new approach. 5、Daily utilizability from hourly cumulative frequency curves. 6、Conditioning of utilizable energy by a thermostatic control of the thermosyphonic flow in solar systems. 7、Correlation of a new utilizability function to experimental data for Southwestern Europe