symptoms of the leaf scorch disease on the leaves of oleander infected by xylella fastidiosa appearing for the first time in lebanon were confirmed by elisa tests and anatomical observations of sections of petioles by a scanning electron microscope. xylella fastidiosa was detected in the xylem forming bacterial aggregates in the lumen of tracheary elements. the bacterium colonizes and invades t...

plastic instability which results in the localization and failure of sheet metals has been studied in equibiaxial stretching of commercial purity aluminium sheet. attention was focussed on two main industrial conditions of the material. these were representative of the materials that could be processed by the commercial batchannealing process (slow heating, long time) or by a continuous anneali...

The purpose of this investigation is to examine the viability of using the sheet metal for forming applications. Forming limit diagram (FLD) composed of negative and positive minor strain with respect to major strain which occurs at directional zero strain with the critical thickness of sheet metal. The negative minor strain region of FLD is predicted by localized necking. However there is no d...

BIFURCATION SET AND LIMIT CYCLES FORMING COMPOUND EYES IN A PERTURBED HAMILTONIAN SYSTEM JIBIN LI AND ZHENRONG LIU In this paper we consider a class of perturbation of a Hamiltonian cubic system with 9 finite critical points . Using detection functions, we present explicit formulas for the global and local bifurcations of the flow . We exhibit various patterns of compound eyes of limit cycles ....

We study pattern formation in a two-species reaction-diffusion system with a conserved quantity. Such systems arise in the study of closed chemical reactors and recurrent precipitation. We compare pattern forming aspects in these systems to Turing-pattern forming systems. We show that in a zero-diffusion limit, these systems possess stable periodic patterns. We also exhibit a wavenumber-selecti...

Aims. We present the results of a search for the negative ion C4H in various dark clouds, low mass star-forming regions and photondominated regions (PDRs). We have also searched for C6H, C2H and CN in some of the sources. Methods. The millimeter-wave observations were carried out with the IRAM-30m telescope. Results. We detect C4H, through the J = 9-8 and J = 10-9 rotational transitions, in the...