Analysing comprehensive efficiency and tapping potential of equipments;

A field survey and analysis on the data from water pumps in bottom hole at Jiaoxi coal mine are presented and a variety of factors effeted on the comprehensive efficiency of water pumps are discussed Therefore, some proposals for the reformation and improvement on water pumps have been put forwar

Research on overall efficiency of Chinese port-typed listed companies;

Based on the non-Archimedian infinite model C~2R of the Data Envelopment Analysis,combined with characteristics of Chinese mainland banks inputs and outputs,the paper sets up an index system of inputs and outputs as well as an overall efficiency evaluation model for Chinese banks,which considers not only the profit ability,but also the control capacity of banks risk.

The study finds:①the international airports in China is still at a relative low level of overall technical efficiency,and pure technical inefficiency is the main cause of the airport inefficiency;②the international airports development of every region in China is not in balance;③.