A family of crisis in a dissipative Fermi accelerator model

The Fermi accelerator model is studied in the framework of inelastic collisions. The dynamics of this problem is obtained by use of a two-dimensional nonlinear area-contracting map. We consider that the collisions of the particle with both periodically time varying and fixed walls are inelastic. We have shown that the dissipation destroys the mixed phase space structure of the nondissipative case and in special, we have obtained and characterized in this problem a family of two damping coefficients for which a boundary crisis occurs. (c) 2006 Elsevier B.V. All rights reserved.

Spectroscopy and electrochemical characterization of Langmuir-Blodgett and physical vapor thin films of 29-membered diazocrown ether 1 with two n-octyl substituents

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Trisomy X and 1 29 translocation in infertile heifers

In a group of 12 Pitangueiras breed heifers exhibiting a high return rate to service, three were noted to be carriers of the 1 29 translocation. One of the heifers exhibited trisomy for the X-chromosome in addition to the 1 29 translocation. The appearance and external genitalia of the 1 29 T; trisomy X heifer were not altered, although on rectal examination the internal genitalia, including the ovaries, appeared similar to that of a prepubertal heifer. © 1987.

Water flow in high-speed handpieces

Objectives: This study measured the water flow commonly used in high-speed handpieces to evaluate the water flow's influence on temperature generation. Different flow speeds were evaluated between turbines that had different numbers of cooling apertures. Method and materials: Two water samples were collected from each high-speed handpiece at private practices and at the School of Dentistry at São José dos Campos. The first sample was collected at the customary flow and the second was collected with the terminal opened for maximum flow. The two samples were collected into weighed glass receptacles after 15 seconds of turbine operation. The glass receptacles were reweighed and the difference between weights was recorded to calculate the water flow in mL/min and for further statistical analysis. Results: The average water flow for 137 samples was 29.48 mL/min. The flow speeds obtained were 42.38 mL/min for turbines with one coolant aperture; 34.31 mL/min for turbines with two coolant apertures; and 30.44 mL/min for turbines with three coolant apertures. There were statistical differences between turbines with one and three coolant apertures (Tukey-Kramer multiple comparisons test with P < .05). Conclusion: Turbine handpieces with one cooling aperture distributed more water for the burs than high-speed handpieces with more than one aperture.

Políticas sobre desarrollo institucional e innovación en biocombustibles en América Latina y el Caribe: Memoria del diálogo de políticas realizado en la CEPAL, Santiago, el 28 y 29 de marzo de 2011

Incluye Bibliografía

Discurso pronunciado por el Sr. Raúl Prebisch en la Cuarta Sesión de la Comisión Económica para América Latina, el 29 de mayo de 1951 en la ciudad de México, DF

Incluye Bibliografía

Acta resumida de la 70a sesión celebrada La Paz el miércoles 29 de mayo a las 11.45 horas

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Comité de Cooperación Sur-Sur: temario provisional, 29 de agosto de 2012

Versión en inglés disponible en Biblioteca

Committee on South-South Cooperation: provisional agenda, 29 August 2012

Spanish version available

Comité de Cooperación Sur-Sur: temario provisional anotado, 29 de agosto de 2012

Versión en inglés disponible en Biblioteca

Committee on South-South Cooperation: annotated provisional agenda, 29 August 2012

Spanish version available

Summary Record of the Seventieth Meeting Held at La Paz on Wednesday, 29 May 1957, at 11.45 a.m.

Incluye Bibliografía