Most qualitative simulation techniques perform simulation at a single level of detail highlighting a xed set of distinctions. This can lead to intractable branching within the behavioral description. The complexity of the simulation can be reduced by eliminating uninteresting distinctions. Behavior abstraction provides a hierarchy of behav-ioral descriptions allowing the modeler to select the a...

Magnetic bearings are used in several applications, but they didn’t succeed in the machine tool industry, due basically to their low damping, with its associated low chatter free cutting capacity. This work shows the development of a high speed milling spindle supported on magnetic bearings with high chatter resistance. That is achieved by using control strategies which add damping to the beari...

Abstract: In this paper, a chatter free sliding mode control(SMC) strategy for chaos synchronization is proposed to the nonlinear uncertain chaotic systems in the presence of unknown bounded uncertainties and external disturbances. The sliding mode surface with differential operators is introduced to divert the discontinuous function swith term into the first derivative of the control input, an...

Chatter is the main problem that limits application of industrial robots in field machining process. It critically important to establish an adaptive chatter detection solution for robot process and realize online chatter. However, different from machine tool chatter, robotic more complex be detected due variable stiffness characteristics weaker normal robot, existing literature has less resear...

Obligate avian brood parasites are raised by heterospecific hosts and, therefore, lack crucial early exposure to relatives and other conspecifics. Yet, young brood parasites readily recognize and affiliate with others of their own species upon independence. One solution to this social recognition paradox is the ontogenetic 'password' mechanism used by obligate parasitic brown-headed cowbirds (M...

AIMS AND OBJECTIVES To assess the acceptability and usability of a standardised communication tool for nurses. BACKGROUND AND SIGNIFICANCE Communication is key in health care. On a daily, if not hourly, basis, nursing staff is inundated with new information regarding tools and resources, practice changes and the work environment. However, there is currently no standardised messaging or delive...

Regenerative chatter is a well-known machining problem that results in unstable cutting process, poor surface quality and reduced material removal rate. This undesired self-excited vibration problem is one of the main obstacles in utilizing the total capacity of a machine tool in production. In order to obtain a chatter-free process on a machining center, stability diagrams can be used. Numeric...

Intelligence operations worldwide monitor individuals directly or indirectly linked to terrorist networks for their communication activities, collectively described as “chatter.” Considerable effort and resources are devoted to assessing intelligence chatter. A major challenge is to distinguish innocuous, everyday discourse from those missives that act to coordinate more nefarious activities. M...