Land desertification is a complex concept which refers to land degradation in the arid region, semi-arid region and sub-humid arid region caused by various factors including climate variability and human activities. It is not only an environmental problem, but also a social and economic one [1]....

Since rural microfinance is a credit which grants loans without collateral and guarantees to farmers, it is considerably important to evaluate and control the household credit risk. Through establishing the evaluation index system and then using catastrophe progression theory, three common types...

In order to study the effect of environmental factors on the algae growth and competition, the author summarized overseas and domestic related researches in recent years. Most of the researches are about the influence of single factor on growth of algae. However, there is insufficient investment...