From the viewpoint of dynamics, this review outlines the recent advances in the studyof nonlinear dynamic systems involving time delays, an important class of dynamic systems invarious engineering fields. The survey is made in three aspects as follows: the dynamic features,available approaches and advances in research on most attractive problems. The evolution of adelayed system depends not only on the current state of the system, but also on previous ones.Hence, a delayed dynamic system should be modeled b...

In recent years, scientists of developed countries have paid a great attention on thefruit firmness evaluation by means of non-destructive techniques. The fruit firmness is an important factor for the fruit ripeness and quality, and is also very useful in its planting and storingmanagement. This paper gives a review of studies on evaluating fruit firmness by dynamic techniques. In this paper, the method used for non-destructive detection and the relationship betweenresonant frequencies and firmness are summ...