A helicopter's main rotor is the most important part of the vehicle. It provides the lift that allows the helicopter tofly, as well as the control that allows the helicopter to move laterally, make turns and change altitude. To handle all of these tasks, the rotor must first be incredibly...
A helicopter's main rotor is the most important part of the vehicle. It provides the lift that allows the helicopter tofly, as well as the control that allows the helicopter to move laterally, make turns and change altitude. To handle all of these tasks, the rotor must first be incredibly...
Three Mile Island, Challenger, Chernobyl—and now, Deepwater Horizon. Like those earlier disasters, the destruction of the drilling rig was an accident waiting to happen.
A helicopter's main rotor is the most important part of the vehicle. It provides the lift that allows the helicopter tofly, as well as the control that allows the helicopter to move laterally, make turns and change altitude. To handle all of these tasks, the rotor must first be incredibly...
With the advent of human civilization and anthropogenic activities in the shade of urbanization and global climate change, plants are exposed to a complex set of abiotic stresses. These stresses affect plants’ growth, development, and yield and cause en