Rural-urban migration and its growing carbon footprint will challenge the world in keeping global average temperature increase to 1.5℃ compared to pre-industrial levels. Existing studies have investigated the emissions of migrants at the national level. However, there has been no clear and...

In order to study the dynamic changes in gas concentration, to reduce gas hazards, and to protect and improve mining safety, a new method is proposed to predict gas concentration. The method is based on the opposite degree algorithm. Priori and posteriori values, opposite degree computation,...

In order to study the dynamic changes in gas concentration, to reduce gas hazards, and to protect and improve mining safety, a new method is proposed to predict gas concentration. The method is based on the opposite degree algorithm. Priori and posteriori values, opposite degree computation,...

The wastewater treatment performance in an inverted A2/O reactor supplemented with fermentation liquid of primary sludge was explored comparing to commercial carbon sources sodium acetate and glucose. Similar COD removal rate was observed with the effluent COD stably reaching the discharge...

We propose a new dimension reduction procedure for portfolio optimization. The vanilla principal component analysis (PCA) restricts the portfolio on the linear subspace spanned by the PCs, which often requires many PCs to performance well. In our framework, the linear subspace is based on a most...

Since the 2008 Financial Crisis, stress tests based on extreme-yet-plausible scenarios have become a preferred method of assessing risk for large financial institutions, yet scenario choice has largely been ad-hoc. We propose a principled methodology to choose scenarios by minimizing the...

The paper considers time series GMM models where a subset of the parameters are time varying. The magnitude of the time variation in the unstable parameters is such that efficient tests detect the instability with (possibly high) probability smaller than one, even in the limit. We show that for...

This study attempts to examine the growth pattern of China’s economy during 1978-1998 from the perspective of income distribution dynamics. Motivated by the model of dynamic distribution, a transition matrix is derived from a panel of ratios of provincial real incomes to national averages...