By wave shape There are two main categories, one is a sine wave inverter and the other is a square wave inverter. The sine wave inverter outputs an even better sinusoidal alternating current than the grid we use every day because it does not have electromagnetic pollution in the grid. The squ ----more
Cavitation phenomenon and its harm (1) cavitation phenomenon Liquid at a certain temperature, due to the dynamic role of liquid metering pump at the inlet pressure is lower than the pressure of the liquid at this temperature vaporization pressure (ie, saturated vapor pressure) Liquid began to vapo ----more
Beijing Dec. 27, according to a statement issued by the US Food and Drug Administration (FDA), a rapidly growing carp is about to reach people's table and become the world’s first genetic project for human consumption ( GE) Animals. According to the FDA's environmental assessment ----more
Emergency lighting is an important safety facility for modern public buildings and industrial buildings. It is closely related to personal safety and building safety. When a building has a fire or other disaster, and the power supply is interrupted, the emergency lighting has an important role ----more
Pipeline engineering includes gas pipelines, water supply and drainage pipelines, air pipelines, etc. The construction quality of these pipelines has a direct impact on our daily lives and must be accepted with care. Pipeline acceptance criteria First, to the drainage 1. The quality of the wate ----more
With the development of economy and the improvement of people's living standards, ordinary people are paying more and more attention to environmental protection and energy-saving home hardware products. In terms of the bathroom hardware industry, more and more domestic sanitary ware c ----more
At present, the three traditional energy sources of oil, coal and natural gas are depleted worldwide, and humans will have to turn to higher-cost bioenergy, water, geothermal, wind, solar and nuclear energy, and China's energy problem is even more serious. There are four major problems in ----more