With the extensive increase in the utilization of energy resources in the modern era, the need of energy extraction from various resources has pronounced in recent years.Thus comprehensive efforts have been made around the globe in the technological development of turbo machines where means of energy extraction is energized fluids.This development
Sandwich structure has been designed to reduce the impact damage of the stress waves.However, the existing work focuses on the optimization of sandwich cores while the face-sheet structure is seldom improved.Here, we used the impedance matching theory to design a negative gradient face-sheet sandwich structure with excellent stress wave attenuation
Insects appeared more than 400 million years ago and they represent the richest and most diverse taxonomic group with several million species.Yet, under the combined effect of the loss of natural habitats, the intensification of agriculture with massive use of pesticides, global warming and biological invasions, insects show alarming signs of decli