The recursive algorithm of HESSELAGER (1994) is extended to a more general class of counting distributions, which includes SUNDT'S (1992) class as well as all the mixed Poisson distributions discussed by WILLMOT (1993).

A new numerical method for solving the twodimensional, steady, incompressible, viscous flow equations on a Curvilinear staggered grid is presented in this paper. The proposed methodology is finite difference based, but essentially takes advantage of the best features of two well-established numerical formulations, the finite difference and finite volume methods. Some weaknesses of the finite di...

Elementary flux modes (direct reaction routes) are minimal sets of enzymes that can operate at steady state, with all irreversible reactions used in the appropriate direction. They can be interpreted as component pathways of a (bio)chemical reaction network. Here, two different definitions of elementary modes are given and their equivalence is proved. Several algebraic properties of elementary ...

We present a Neumann-subproblem a posteriori finite element procedure for the efficient and accurate calculation of rigorous, “constant–free” upper and lower bounds for sensitivity derivatives of functionals of the solutions of partial differential equations. The design motivation for sensitivity derivative error control is discussed; the a posteriori finite element procedure is described; the ...

The growing need to evaluate the quality of aquatic ecosystems led to the development of numerous monitoring tools. Among them, the development of biomarker-based procedures, that combine precocity and relevance, is recommended. However, multi-biomarker approaches are often hard to interpret, and produce results that are not easy to integrate in the environmental policies framework. Integrative...

We present a Neumann-subproblem a posteriori "nite element procedure for the e$cient and accurate calculation of rigorous, `constant-freea upper and lower bounds for sensitivity derivatives of functionals of the solutions of partial di!erential equations. The design motivation for sensitivity derivative error control is discussed; the a posteriori "nite element procedure is described; the asymp...

This paper presents MoSS-CC (Model-based Simulation System for Cost Calculation in wastewater treatment plants), a software tool to optimise wastewater treatment plant design and operation by means of simulation and cost analysis. The scenario analysis procedure is encoded in the software as a VPL (Virtual Product Lifecycle). Roughly, the scenario consists of two phases: the design phase and th...

One-loop amplitudes of gluons in supersymmetric Yang-Mills are four-dimensional cut-constructible. This means that they can be determined from their unitarity cuts. We present a new systematic procedure to explicitly carry out any finite unitarity cut integral. The procedure naturally separates the contributions from bubble, triangle and box scalar integrals. This technique allows the systemati...

Committees of models are frequently employed to improve accuracy and decrease the variance of individual models. Each model has an equal right to vote (democratic procedure), despite obvious differences in model competence in different regions of the feature space. Adding competence factors to different models before calculation of the committee decision (undemocratic procedure) improves the qu...

A numerical procedure which allows the convenient exploration of various optimize, tion hypotheses of breathing pattern regulation is described. The method is based on the calculus of variations and uses a novel technique for the automatic evaluation of all required derivatives. Advantages of this approach include: exact calculation of all derivatives, parsimonious computer code, and speed of e...