According to a report by the Canadian Chinese Network on May 24, a team of Chinese professor Zhang Xiang, assistant professor Wang Feng and postdoctoral researcher Liu Ming of the University of California, Berkeley, developed the world's smallest graphene. Optical modem" (modem comm.......

Fastener companies face competition every day. Every company wants to enhance its competitiveness. When people talk about corporate competitiveness in the past, they usually only consider the conventional competitive factors: market, users, competitors, and technical .......

Gear pumps are also referred to in the jargon as positive displacement devices, ie pistons in a cylinder, which are squeezed out mechanically as one tooth enters the fluid space of the other tooth, since the fluid is incompressible , So the liquid and the tooth can not occupy the same space at .......