Sinopsis de la legislación sobre hidrocarburos en la Argentina : análisis comparativo del denomidado Plan Houston I y II

Fil: Abramovich Cosarin, Víctor E. Universidad de Buenos Aires. Facultad de Derecho. Buenos Aires, ArgentinaFil: Fiuza, Alejandro Daniel. Universidad de Buenos Aires. Facultad de Derecho. Buenos Aires, Argentin

Ion acceleration from laser-driven electrostatic shocks

Multi-dimensional particle-in-cell simulations are used to study the generation of electrostatic shocks in plasma and the reflection of background ions to produce high-quality and high-energy ion beams. Electrostatic shocks are driven by the interaction of two plasmas with different density and/or relative drift velocity. The energy and number of ions reflected by the shock increase with increasing density ratio and relative drift velocity between the two interacting plasmas. It is shown that the interaction of intense lasers with tailored near-critical density plasmas allows for the efficient heating of the plasma electrons and steepening of the plasma profile at the critical density interface, leading to the generation of high-velocity shock structures and high-energy ion beams. Our results indicate that high-quality 200 MeV shock-accelerated ion beams required for medical applications may be obtained with current laser systems.Comment: 33 pages, 12 figures, accepted for publication in Physics of Plasma

Laser-driven shock acceleration of monoenergetic ion beams

We show that monoenergetic ion beams can be accelerated by moderate Mach number collisionless, electrostatic shocks propagating in a long scale-length exponentially decaying plasma profile. Strong plasma heating and density steepening produced by an intense laser pulse near the critical density can launch such shocks that propagate in the extended plasma at high velocities. The generation of a monoenergetic ion beam is possible due to the small and constant sheath electric field associated with the slowly decreasing density profile. The conditions for the acceleration of high-quality, energetic ion beams are identified through theory and multidimensional particle-in-cell simulations. The scaling of the ion energy with laser intensity shows that it is possible to generate $\sim 200$ MeV proton beams with state-of-the-art 100 TW class laser systems.Comment: 13 pages, 4 figures, accepted for publication in Physical Review Letter

Avaliação da composição de híbridos amarelos de mandioca em duas idades.

O cultivo da mandioca é de grande relevância socioeconômica para o Brasil e para o mundo. A mandioca apresenta facilidade de cultivo, resistência a doenças e a variações climáticas, propiciando a oportunidade de se preparar vários alimentos, sendo o teor de compostos cianogênicos contido nas raízes um dos fatores que definem a finalidade de uso da mandioca, com as variedades classificadas em 'mansas' e 'bravas'

Conference closing

Os habéis puesto en camino a Ourense para compartir algo que lleváis muy dentro de vuestro corazón. Nuestra inquietud por la espiritualidad y por la belleza nos han reunido en este congreso de arquitectura religiosa para afrontar el tema capital de la identidad en el espacio sagrado. Hemos escuchado ponencias y comunicaciones que han renovado nuestro entusiasmo y nuestro compromiso. Gracias a todos los ponentes por esta esperanza maravillosa que ilumina nuestras inquietudes. Este congreso también ha sido —y de una manera muy especial— un momento de gozo. Gozo de quien está buscando con ilusión, y gozo de los que escuchamos algo que con alegría estamos buscando y sabemos que estamos en el camino. Habría que decir una vez más que la arquitectura no es el problema, sino que en este momento la arquitectura es la gran oportunidad. Lo mismo se podría decir de las demás bellas artes, especialmente de la escultura, con estas expresiones que hoy hemos escuchado tan hermosamente expuestas.You have set out on your way to Ourense to share something that you carry deep within your heart. Our concern for spirituality and beauty has brought us together in this religious architecture congress to face the capital issue of identity in the sacred space. We have listened to papers and communications that have renewed our enthusiasm and our commitment. Thanks to all the speakers for this wonderful hope that illuminates our concerns. This congress has also been - and in a very special way - a moment of joy. I enjoy who is looking forward, and joy of those who listen to something that we are looking for with joy and we know we are on the way. We should say once again that architecture is not the problem, but at this moment architecture is the great opportunity. The same could be said of the other fine arts, especially sculpture, with these expressions that we have heard so beautifully exposed today

Extreme Plasma Astrophysics

This is a science white paper submitted to the Astro-2020 and Plasma-2020 Decadal Surveys. The paper describes the present status and emerging opportunities in Extreme Plasma Astrophysics -- a study of astrophysically-relevant plasma processes taking place under extreme conditions that necessitate taking into account relativistic, radiation, and QED effects.Comment: A science white paper submitted to the Astro-2020 and Plasma-2020 Decadal Surveys. 7 pages including cover page and references. Paper updated in late March 2019 to include a several additional co-authors and references, and a few small change

Composição de raízes de mandioca em três épocas de colheita.

A cultura da mandioca é de grande relevância socioeconômica para o Brasil, apresentando as características de facilidade de cultivo e resistência a doenças e a variações climáticas. Com a raiz da mandioca pode-se preparar vários tipos de alimentos, sendo o teor de compostos cianogênicos um dos fatores que definem a finalidade de uso, classificando as variedades em ?mansas? e ?bravas?