The relationships between water yields of tributaries and coverage of different vegetation types in the corresponding sub-watersheds were investigated during the wet season in the Heishui River Valley, located in the upper portion of the Yangtze River in western China. Stable isotope analysis...

We have studied the statistical mechanics of money circulation in a closed economic system. An explicit statistical formulation of the circulation velocity of money is presented for the first time by introducing the concept of holding time of money. The result indicates that the velocity is...

In order to reveal the characteristics of land use change in the south loess plateau, this paper tentatively divided Loess Plateau into North and South under the support of GIS, and then introduced land use spatial temporal dynamic model, analyzed land use dynamic change in provincial scale. The...

On the basis of traditional weighted network, we study a new complex network model with multi-weights, which has one or several different types of weights between any two nodes. According to the method of network split, we split the complex network with multi-weights into several different...

The <i>hukou</i> system is one of the most enduring legacies of the 20th-century Chinese socialist control instruments. The hukou in the Chinese context is an official identity of residency rights in a given geographic unit. Cities use the hukou policy to impede the urban hukou of migrants who are...

By using a competition measure derived from the textual analysis of firms' 10-K filings, we examine the relationship between product market competition and the county-level unemployment. We find that unemployment is negatively related to product market competition pressure and the result is...

There is a large literature documenting that high host-country corporate taxes deter foreign direct investment. However, some recent papers have questioned the robustness of this result in developing countries. In this paper we investigate one possible reason: the presence of a trade-off between...