The concept of the taxon cycle involves successive range expansions and contractions over time, through which a species can indefinitely maintain its core distribution.Otherwise, it becomes extinct.Taxon cycles have been defined mostly for tropical island faunas; examples from continental areas are scarce, and similar case studies for plants remain
Al2O3-based self-lubricating ceramics are cutting tool materials that meet the extreme working conditions of dry cutting.However, due to the soft lubricating components, the mechanical properties of composites are dramatically reduced.In this paper, Al2O3-cBN-hBN self-lubricating material was designed.High density, fine grain ceramics were synthesi
This paper studies the problem of the secure state estimation of cyber-physical systems.The system model we studied is a class of discrete-time systems with state delay and sparse sensor attacks.In the design of the observer, a Projection Operator is utilized to determine the correct attack set, and the cent dyyni gain matrix will be switched accor
The research on improvement of methodical approaches to definition of the probable reasons of infringement of conditions of stability of freight cars from derailment is carried out.Using a basic computer model of the dy-namics of a freight car, the stickers logos dallas cowboys influence of the characteristics of the technical condition of their ru