Introduction Normal heptane, isooctane and cyclohexane have been the most interested surrogate components for liquid transportation and aviation fuels, due to their roles as indicative fuels for octane number and the representative compounds for normal, iso and cyclo-paraffins. Methodologies of mechanism generation for these representative fuel fractions have been discussed in detail in literat...

We construct and analyze a new family of quadrangular (in two dimensions) or cubic (in three dimensions) mixed finite elements for the approximation of elastic wave equations. Our elements lead to explicit schemes (via mass lumping), after time discretization, including in the case of anisotropic media. Error estimates are given for these new elements.

CHEMICAL LUMPING Xiaoxiao Wang, Brandenburg Technical University of Cottbus, Germany A compact and comprehensive kinetic model for the oxidation methyl-decanoate has been developed. Methyl-decanoate is an important surrogate fuel component representing the methyl-ester fraction in biodiesel. The mechanism generation rules are consistent with previous n-heptane mechanism and complied with specif...

Photochemical mechanisms are a critical module of air quality models. In the past 20 years, several mechanisms have been developed to study the chemistry of the troposphere. This work compares several state-of-the-science photochemical mechanisms (including LCC, CBM-IV, RADM2, EMEP, RACM, SAPRC99, and CACM which have never been compared before in other studies). Concise descriptions of the chem...

We present a parallel solver for wave propagation problems based on the higher order explicit finite elements developed by Cohen et al. These elements were introduce to allow mass-lumping while preserving high accuracy. Our approach is based on a coarse grain, domain splitting parallelism, and uses the new MPI standard as message passing library. The program currently runs on a network of works...

This paper is about situation semantics and about the meaning of counterfactuals. It argues that there is a close connection between the laws of counterfactual reasoning and a relation between propositions that I want to call 'lumping'. Capturing this relation seems to require a component of semantic interpretation which recognizes parts of possible worlds (situations) as primitives and implies...

This paper presents two meta-heuristic algorithms to solve an extended portfolio selection model. The extended model is based on the Markowitz's Model, aiming to minimize investment risk in a specified level of return. In order to get the Markowitz model close to the real conditions, different constraints were embedded on the model which resulted in a discrete and non-convex solution space. ...

in this paper, a neural network model reference adaptive system speed observer is designed, which can be used in speed control of linear induction motors (lims). dynamical equations of lim have been considered accurate. in other words, the end effect and the electrical losses of the motor have been included in the motor equivalent circuit. then equations of the reference model and adaptive mode...

In this paper, we examine the influence of numerical integration on finite element methods using quadrilateral or hexahedral meshes in the time domain. We pay special attention to the use of Gauss-Lobatto points to perform mass lumping for any element order. We provide some theoretical results through several error estimates that are completed by various numerical experiments. c © ??? John Wile...