background: poison control centre of morocco (mpcc) plays a key role in promoting health. this study was aimed to demonstrate the role of the mpcc in improving public health and poisoning management. methods: this was a retrospective study of poisoning cases reported to the mpcc between 1980 and 2011. the collected data included number of poisoning cases, profession of interlocutor who called t...

background: poisoning incidents, in both children and adolescents, are known to occur in new zealand but little is known about the agents implicated.   methods: all the calls received over the ten years between 2000 and 2009, by the national poison centre in new zealand, were retrospectively reviewed. calls related to cases involving those less than 19 years were included. the data were analyze...

I introduce an innovative methodology for deriving numerical models of systems of partial differential equations which exhibit the evolution of spatial patterns. The new approach directly produces a discretisation for the evolution of the pattern amplitude, has the rigorous support of centre manifold theory at finite grid size h, and naturally incorporates physical boundaries. The results prese...

Hopf bifurcations in problems with O(2) symmetry are considered. In these problems, the Jacobian matrix is always singular at the circle of Z2 symmetric steady state solutions. While a couple of imaginary eigenvalue cross the imaginary axis, the Hopf bifurcation is not of standard type. The canonical coordinates transformation is used for removing the zero eigenvalue and converting the problem ...

This paper presents an existence theory for small-amplitude solitary-wave solutions to the classical water-wave problem in the absence of surface tension and with an arbitrary distribution of vorticity. The hydrodynamic problem is formulated as an infinite-dimensional Hamiltonian system in which the horizontal spatial direction is the time-like variable. A centre-manifold reduction technique is...

Conflict sets are loci of intersecting wavefronts emanating from l different surfaces. We show that generically conflict sets are Legendrian: locally they admit the structure of wavefronts. Simple stable singularities for this problem in Rn occur when 0 ≤ n − l ≤ 4. Other related sets, such as kite curves and centre sets are also defined and discussed. Throughout canonical relations are used as...

In this paper, we consider a discrete Gompertz model with time delay. Firstly, the stability of the equilibrium of the system is investigated by analyzing the characteristic equation. By choosing the time delay as a bifurcation parameter, we prove that NeimarkSacker bifurcations occur when the delay passes a sequence of critical values. The direction and stability of the Neimark-Sacker are dete...

here, a finsler manifold $(m,f)$ is considered with corresponding curvature tensor, regarded as $2$-forms on the bundle of non-zero tangent vectors. certain subspaces of the tangent spaces of $m$ determined by the curvature are introduced and called $k$-nullity foliations of the curvature operator. it is shown that if the dimension of foliation is constant, then the distribution is involutive a...

In this research, a new exhaust manifold and its cooling jackets is first designed for the integrated exhaust manifold into cylinder head (IEMCH) for a turbocharged engine. Then, the gas exchange and flow analysis is carried out numerically to evaluate the proper conditions for the exhaust gas and the coolant stream respectively. Finally, the entire engine parts are thermally analyzed to assure...