1 Introduction

The battery is the key power output unit of electric vehicles. In the common batteries such as lead-acid batteries , nickel-cadmium batteries, nickel-hydrogen batteries, lithium batteries and fuel cells, it has low energy ratio, light .......

1) Eliminate the resonance noise method Only when the control valve resonance, only the energy superposition produces strong noise more than 100 dB, some performance is strong vibration, the noise is not big, some vibration is weak, but the noise is very large; some vibration And the noise is g.......

The Key Laboratory of Advanced Low-Cost Chemical Power in Jilin Province, approved by the Changchun Yinghua Institute of Advanced Chemistry Power Supply Laboratory of the Chinese Academy of Sciences, was recently approved for establishment.
The key laboratory will focus on the basic scien.......

In order to improve the speed of the nesting and improve the accuracy of the steel production of the first ship, Xiamen Shipbuilding has introduced the SIGMANEST automatic nesting .......

On December 10, 2010, India made an anti-dumping final ruling against carbonate barium originally produced in China. The product code involved in the customs code is 28366000.
In June 2009, India initiated an anti-dumping investigation against barium carbonate originating in China; in Jan.......

Huang Tianwen, president of Sinosteel Group, visited the SASAC website yesterday and said in an interview with reporters that at present, China's steel industry faces some difficulties, but the long-term development of the country requires the strong support of the iron and steel industry........

The Middle East region has recently exported large quantities of cheap petrochemical products to the global petrochemical industry by virtue of its advantages in raw materials and scale, and has further gained market share, thus enhancing its right to speak in the international petrochemical m.......

In recent years, the global automotive industry has been eagerly seeking solutions for fuel-efficient and alternative energy sources, and has recognized a gradual convergence, namely, “three steps”: recently, the promotion of natural gas and ethanol for diesel and non-oil.......