17 research outputs found
Recycling Parrondo games
No full textWe consider a deterministic realization of Parrondo games and use periodic orbit theory to analyze their asymptotic behavior
Dynamical and transport properties in a family of intermittent area-preserving maps
No full textWe introduce a family of area-preserving maps representing a (non-trivial) two-dimensional extension of the Pomeau-Manneville family in one dimension. We analyze the long-time behavior of recurrence time distributions and correlations, providing analytical and numerical estimates. We study the transport properties of a suitable lift and use a probabilistic argument to derive the full spectrum of transport moments. Finally the dynamical effects of a stochastic perturbation are considered
Transport in deterministic ratchets: periodic orbit analysis of a toy model
No full textWe consider a toy model of ratchet behavior, the so-called Parrondo games. We build up a deterministic version of the game and show that periodic orbit theory is able to detail its quantitative features thoroughly
A Girl with Cutaneous Lesions, Polyarthritis, and Antinuclear Antibodies Positivity
No full textOn October 1996, a 14-year-old girl was admitted to the hospital because cutaneous lesions, asthenia, and arthralgias. On examination, there was nonscarring hair thinning with a widened part over the frontal hairline, polymorphic papulosquamous rash on her face, neck, arms, and trunk, and livedo reticularis in her legs. Multiple aphtous ulcers were present on the buccal and nasal mucosa. There was polyarthritis involving the wrist, metacarpophalangeal joints, proximal interphalangeal joints, and metatarsophalangeal joints of both hands and feet. Skin biopsy of the face was compatible with subacute cutaneous lupus erythematosus. She started on prednisone 60 mg/d without improvement, and later hdroxhchloroquine (HCQ) 6 mg/kg/d was added for one year. Cutaneous lesions were almost healed, with just a hypopigmented macules left. Over the last 14 years, she has not shown any cutaneous or systemic manifestations.</jats:p
