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Let M = M0 Ã— R be a ppâ€“wave type spacetime endowed with the metric ã€ˆÂ·, Â·ã€‰z = ã€ˆÂ·, Â·ã€‰x + 2 du dv + H(x, u) du, where (M0, ã€ˆÂ·, Â·ã€‰x) is any Riemannian manifold and H(x, u) an arbitrary function. We showâ€¦ (More)

A general class of Lorentzian metrics, M0 Ã—R, ã€ˆÂ·, Â·ã€‰z = ã€ˆÂ·, Â·ã€‰x + 2 du dv + H (x, u) du2, with (M0, ã€ˆÂ·, Â·ã€‰x ) any Riemannian manifold, is introduced in order to generalize classical exact planeâ€¦ (More)

- Kathryn L Adeney, J. L. Zamorano Flores, J. C. Perez, S. Sanchez, M. A. Williams
- Cephalalgia : an international journal ofâ€¦
- 2006

Migraine headaches are among the leading causes of disability in the world. The burden of migraines is highest in women of reproductive age. This cross-sectional study characterized the prevalence,â€¦ (More)

- J. L. Zamorano Flores, Randall Higgins, Sylvie D'Allaire, Robert N. Charette, Mathieu Boudreau, Michael Brandon Gottschalk
- The Canadian veterinary journal = La revueâ€¦
- 1993

Global geometric properties of product manifolds M = M Ã— R2, endowed with a metric type ã€ˆÂ·, Â·ã€‰ = ã€ˆÂ·, Â·ã€‰R + 2dudv + H(x, u)du 2 (where ã€ˆÂ·, Â·ã€‰R is a Riemannian metric on M and H : M Ã— R â†’ R aâ€¦ (More)

- G. F. Serrano Moya, J. L. Zamorano Flores
- 14th International Conference on Electronicsâ€¦
- 2004

In the design, performance evaluation and installation of indoor radio communication systems, which require a continuous coverage and reliability, it is necessary to have an accurate characterizationâ€¦ (More)

A complete and systematic approach to compute the causal boundary of wave-type spacetimes is carried out. The case of a 1-dimensional boundary is specially analyzed and its critical appearance inâ€¦ (More)

- P M Minaire, J Cherpin, J. L. Zamorano Flores, D. Weber
- World health statistics quarterly. Rapportâ€¦
- 1989

Handicap is the result of a process initiated by an underlying disease, an accident or an abnormality, which leads to a functional deficit in various situations of everyday life. This definition,â€¦ (More)

- J. L. Zamorano Flores, Yennis Parra, U. PERCOCO
- 2004

A complete study of the structure of Ricci collineations for type B warped spacetimes is carried out. This study can be used as a method to obtain these symetries in such spacetimes. Special cases asâ€¦ (More)

- J. L. Zamorano Flores, Graciana Alejandra Fuentes PÃ¡ez, Martin Strojnik
- Applied optics
- 1999

We analyze the imaging performance of a number of diluted-aperture configurations, using the modulation transfer function. We select a single figure of merit, the practical cutoff frequency, ratherâ€¦ (More)