1. Fixed speed pump and speed pump working principle and characteristics

When the pump installed in a certain pipeline work, the actual state of work depends not only on the performance curve of the pump itself, but also depends on the characteristics of the…

According to Nikkei News, Japanese company Mitsui Shipbuilding Corporation is optimistic about the needs of China with serious atmospheric pollution problems. It plans to convert t…

The 10-year long run finally reached the end. On January 27, Dongfeng Motor Group Co., Ltd. and Volvo Group formally signed a coalition with capital as the link. Zhu Fushou, executive director and president of Dongfeng Group, said that the newly formed Dongfeng Commercial Vehicles joint v…

Since the reform and opening up, with the rapid development of urban construction, some overhead lines in urban areas have been gradually replaced by power cable lines. Some 10kV, 35kV and even 110kV and 220kV overhead lines in some economically developed cities have all or part …

In the next five years, Jinzhou will build five major bases, including the national North China refining and chemical industry, the Chinese PV industry, the petrochemical textile industry, the special ferroalloy industry, and the chlorination of titanium dioxide.
National North Refining a…

Abstract: Signal distribution is very important in the test system. A multi-channel control circuit based on ISA bus is designed according to the requirements of a missile test equipment. The circuit integrates 16 optocoupler isolated input circuits and 8 relay output circuits to complete the i…

The semiconductor lighting (LED) industry, one of the emerging industries in the 12th Five-Year Plan, is currently on the fast track. According to the data of the Ministry of Industry and Information Technology for the first half of the year, as of the end of June, a total of 39.28 billion…

1. Overview Gas purification is a process in which the raw gas sent from the coke oven is washed, stripped of ammonia, dechlorinated, etc. into a relatively pure refined gas, which is then sent to the gas station or end user.

The refined gas after purification contains various componen…

Soil moisture is the basic condition for crop growth and development and an important parameter for crop yield forecast. At the same time, it is also an important environmental factor and process parameter in hydrology, meteorology and other scientific research fields, so it is of gr…

Winter, excess, and shuffling have become the hottest keywords in the LED industry in 2012. The LED industry is full of performance losses, bad business, bosses running, and company failures. However, for LEDs, such an emerging In the sunrise industry, entrepreneurs are still reluctant to …