Myocardial infarctions are frequently complicated by tachyarrhythmias, which commonly have wide QRS complexes (QRS duration > 120 milliseconds). Many published criteria exist to help differentiate between ventricular and supraventricular mechanisms. We present a case of a 61-year-old male with a history of hypertension, hyperlipidemia and coronary artery disease with prior stenting of the right...

A Brownian particle with diffusion coefficient D is confined to a bounded domain by a reflecting boundary, except for a small absorbing window ∂ a . The mean time to absorption diverges as the window shrinks, thus rendering the calculation of the mean escape time a singular perturbation problem. In the three-dimensional case, we construct an asymptotic approximation when the window is an ellips...

We analyse the decay Θs(1/2)→ NK in a non-relativistic Fock space description using three and five constituent quarks for the nucleon and the pentaquark, respectively. Following Jaffe and Wilczek [1], we assume that quark-quark correlations in spin-zero state play an important role for the pentaquark internal structure. Within this scenario, a strong dynamical suppression of the decay width is ...

This paper is a response to ‘Why Be Rational?’ by Niko Kolodny. Kolodny argues that we have no reason to satisfy the requirements of rationality. His argument assumes that these requirements have a logically narrow scope. To see what the question of scope turns on, this comment provides a semantics for ‘requirement’. It shows that requirements of rationality have a wide scope, at least under on...

1. PURPOSE AND DESCRIPTION The narrow beam tube 06950.00 is used in conjunction with the pair of Helmholtz coils 06960.00 to study the behaviour of an electron beam in a magnetic field normal to the electron trajectory, which is made visible by the fluorescence of the insert gas with which the tube is filled. The tube has an axial scale shaped like a ladder, whose metal 'rungs' are given a coat...

We apply results from linear programming to show that the relaxation of model checking over integers to reals is accurate i e yields a full test of temporal properties for a large class of concurrent systems We de ne abstractions similar to widening and narrowing that accelerate least and greatest xpoint computations in model checking over integers or reals We show that these abstractions are a...

We examine some variants of computation with closed time-like curves (CTCs), where various restrictions are imposed on the memory of the computer, and the information carrying capacity and range of the CTC. We give full characterizations of the classes of languages recognized by polynomial time probabilistic and quantum computers that can send a single classical bit to their own past. Such narr...

We study a lattice model for the spreading of fluid films, which are a few molecular layers thick, in narrow channels with inert lateral walls. We focus on systems connected to two particle reservoirs at different chemical potentials, considering an attractive substrate potential at the bottom, confining sidewalls, and hard-core repulsive fluid-fluid interactions. Using kinetic Monte Carlo simu...

The narrow-V ship wake in a radar image is typically a bright V-shaped or wedge-like return with an angle of a few degrees. It is often seen in images from satellite-borne Synthetic Aperture Radar (SAR), especially when the ship is traveling in a direction close to the SAR track and when the wind is light. Though explanation for the narrow-V wake exists already, it has been recognized from the ...

The narrow escape problem in diffusion theory is to calculate the mean first passage time of a diffusion process to a small target on the reflecting boundary of a bounded domain. The problem is equivalent to solving the mixed Dirichlet–Neumann boundary value problem for the Poisson equation with small Dirichlet and large Neumann parts. The mixed boundary value problem, which goes back to Lord R...