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- Pedro J. Torres
- 2002

This paper is devoted to study the existence of periodic solutions of the second-order equation x00 1⁄4 f ðt; xÞ; where f is a Carathéodory function, by combining some new properties of Green’s… (More)

- R. Navarro, Ricardo Carretero-González, +5 authors David S Hall
- Physical review letters
- 2013

We study the dynamics of small vortex clusters with a few (2-4) corotating vortices in Bose-Einstein condensates by means of experiments, numerical computations, and theoretical analysis. All of… (More)

- V. Pârvan RO-300223-Timişoara, Pedro J. Torres
- 2012

In this paper, by using Leray-Schauder degree arguments and critical point theory for convex, lower semicontinuous perturbations of C-functionals, we obtain existence of classical positive radial… (More)

- Robert B. Voas, Pedro J. Torres, Eduardo A A Romano, John H. Lacey
- Journal of studies on alcohol and drugs
- 2012

OBJECTIVE
The purpose of this study was to determine whether the relative risk of being involved in an alcohol-related crash has changed over the decade from 1996 to 2007, a period during which there… (More)

Sufficient conditions for the existence of a solution to the problem u′′(t) = g(t) uμ(t) − h(t) uλ(t) + f(t) for a. e. t ∈ [0, ω], u(0) = u(ω), u′(0) = u′(ω) are established. 2000 Mathematics Subject… (More)

Article history: Received 12 June 2011 Accepted 24 June 2011 Available online 29 June 2011 Communicated by V.M. Agranovich We present a systematic theoretical analysis of the motion of a pair of… (More)

We develop new criteria for the stability of a periodic solution of a given newtonian equation based on the L-norm of the coefficients of the third order approximation, by proving that the twist… (More)

In this paper, we study the existence of positive periodic solutions to second-order singular differential equations. The proof relies on Schauder’s fixed point theorem. Our results show that in some… (More)

where is an –Caratheodory function, that is, a function such that is measurable for every , is continuous a.e. and for any , there exists a function such that for all and a.e. . The method of lower… (More)

- John H. Lacey, Tara Kelley-Baker, +4 authors Amy Berning
- Evaluation review
- 2011

This article describes the methodology used in the 2007 U.S. National Roadside Survey to estimate the prevalence of alcohol- and drug-impaired driving and alcohol- and drug-involved driving. This… (More)