In this lecture we introduce a useful tool to study the robustness against disturbances of nonlinear systems. Our starting point is the observation that, given a globally asymptotically stable equilibrium, a small enough perturbation of the vector field should not change the phase portrait much, and hence should not destroy the stability properties. However, how large can the perturbations be b...

In many real-world applications, sensitive information must be kept in log files on an untrusted machine. In the event that an attacker captures this machine, we would like to guarantee that he will gain little or no information from the log files and to limit his ability to corrupt the log files. We describe a computationally cheap method for making all log entries generated prior to the loggi...

Challenging an attitude toward fallibility in medical practice which they see as outdated and detrimental to patient care, the authors suggest a new approach to self-evaluation and peer review by physicians. Arguing that knowledge grows from recognition of error, they submit ten proposals aimed at the development of a new professional ethics that would encourage physicians to admit and analyze...

Carbon nanotube (CNT) film has been considered as a promising preform of CNTs for developing high performance composites that possess content CNTs. However, due to the intertube van der Waals interactions, in films are often tightly bundled together, making impregnation resin materials very challenging. In this work, an eco-friendly ultrasonic-assisted infiltration process developed, and its ef...

We report intensely staining epiretinal membrane (ERM) with Brilliant Blue G (BBG) under air for two minutes. ERM peeling was performed in 21 cases. After removal of posterior hyaloid, 0.2 mL BBG was first applied on the macula, to stain ERM under air conditions for 2 minutes. Internal limiting membrane (ILM) was intensely stained and peeled in all cases following ERM removal. In 4 cases, the E...

Sib,?The following case is of interest, as being an undoubted case of scarlatina, a disease that is, as far as I know, veiy seldom met with in India, and though I have occasionally seen cases in Calcutta that in some respects resembled scarlatina, they have always been somewhat doubtful in character. As this disease is in Europe so intensely contagious, it would be interesting to know if other ...