We study the traffic of two types of molecular motors using the two-species asymmetric simple exclusion process (ASEP) with periodic boundary conditions and with attachment and detachment of particles. We determine characteristic properties such as motor densities and currents by simulations and analytical calculations. For motors with different unbinding probabilities, mean-field theory gives ...

In this paper we construct a family of 2-(qn,sp2,λ) additive designs D=(P,B), where q is power prime p ≥ 2 and P an n-dimensional vector space over GF(q), compute their parameters explicitly. These designs, except for some special cases, had not been considered in the previous literature on block designs.

Exception handling in Ada has a number of well-known problems. It allows for the propagation of unhandled and anonymous exceptions, it is error-prone and it is inappropriate for some language features including tasking and tagged types. Ada programs with exceptions are difficult to understand, develop, modify or analyse, and the exception handling features can be misused in a number of ways. In...

Given a polynomial P in several variables over an algebraically closed field, we show that except in some special cases that we fully describe, if one coefficient is allowed to vary, then the polynomial is irreducible for all but at most deg(P ) − 1 values of the coefficient. We more generally handle the situation where several specified coefficients vary.