Event-triggered pinning control of switching networks

This paper investigates event-triggered pinning control for the synchronization of complex networks of nonlinear dynamical systems. We consider networks described by time-varying weighted graphs and featuring generic linear interaction protocols. Sufficient conditions for the absence of Zeno behavior are derived and exponential convergence of a global normed error function is proven. Static networks are considered as a special case, wherein the existence of a lower bound for interevent times is also proven. Numerical examples demonstrate the effectiveness of the proposed control strategy

Stimulation of various forms of stress corrosion in an austenitic stainless steel

A heat-treated AISI304 austenitic stainless steel has been studied in a 1N H2SO4 + 0.2N NaCl solution at constant load and at room temperature and80°C.The SEM examination has been used to ascertain the morphology and evolution of attack, initiated at preformed pits having critical dimensions, owing to the effect of polarization in the imperfect passivity zone and subsequently, alternatively in the regions of perfect passivity, active-passive transition, activity and in freely-corroding conditions. Reverse and direct polarization sequences have been investigated.It has been observed that in some cases the integranular mode of attack changes to transgranular. In other cases it is intensified. While in yet others it is depressed. Attack that is initially transgranular cannot be modified to intergranular.With the methodologies applied it has been possible at will to induce the appearance of various stress-corrosion cracking forms or to ensure the degeneration thereof into other forms of attack

Human papillomavirus in virgins and behaviour at risk

Human papillomavirus (HPV) infection is one of the most common sexual transmitted diseases (STDs). We compared two groups of virgins with genital HPV lesions to evaluate the behaviour at risk in the transmission of HPV infection. Partners were also examined. HPV lesions were detected in 88 virgins, who have never had sexual intercourse. This can be due to vertical transmission, fomities and skin-to-skin contact. Many other hypothesis can be proposed to explain HPV genital infection, however, further studies are required

Glycaemic load versus carbohydrate counting for insulin bolus calculation in patients with type 1 diabetes on insulin pump

To evaluate feasibility and effectiveness on short-term blood glucose control of using glycaemic load counting (GLC) versus carbohydrate counting (CC) for prandial insulin dosing in patients with type 1 diabetes (T1D)