inverted papillomas of the nose and paranasal sinuses are uncommon neoplasms, characterized by their tendency to occur and by their association with malignancy. in the past decade there has been a trend toward the use of endoscopic surgical techniques in the management of these tumors. this article presents the results of a prospective study of24 patients with inverted papilloma resected by the...

Two questions arise when considering chemical architectures for cellular life: (i) are specific features such as cycles, autocatalysis or metabolic closure required? (ii) how can chemical insulation between the inside and the outside be achieved? As most theoretical biology work has focused on the inside of the cell, significant work has only been devoted to the first question, yet without any ...

An integrated design of structure/controller for parallel inverted pendulum systems is presented. In practical parallel inverted pendulum systems, existence of a realizable stabilizing controller is inevitably determined depending on the position of center of gravity of two pendulums. In this paper these parameters are set as structural parameters in structural systems and a descriptor form rep...

Known sufficient condition for stabilization of the controlled inverted pendulum under stochastic perturbations is improved via V.Kolmanovskii and L.Shaikhet general method of Lyapunov functionals construction.

Ultrasonic antifouling devices are installed globally on a variety of vessel types and marketed as an environmentally friendly method for biofouling control. The aim this study was to examine the effects ultrasound adults three species common solitary ascidians (Ciona intestinalis, Ascidiella aspersa Styela plicata). After brief (10 s) exposure two frequencies (30 35 kHz), alterations in freque...

In a previous research note (Coopersmith and Hall 1999) we described the objectives and initial research findings of the Siphon Creek (Fort St. John) Installation of Experimental Project (EP) 1077. A second EP1077 installation, Bear Mountain, will be the focus of the present report. The previous research note (PG-17) concentrated on the effects of overtopping aspen canopies on understorey spruc...