A discretized integral hydrodynamics

Using an interpolant form for the gradient of a function of position, we write an integral version of the conservation equations for a fluid. In the appropriate limit, these become the usual conservation laws of mass, momentum and energy. We also discuss the special cases of the Navier-Stokes equations for viscous flow and the Fourier law for thermal conduction in the presence of hydrodynamic fluctuations. By means of a discretization procedure, we show how these equations can give rise to the so-called "particle dynamics" of Smoothed Particle Hydrodynamics and Dissipative Particle Dynamics.Comment: 10 pages, RevTex, submitted to Phys. Rev.

Prazer sem camisinha: novos posicionamentos em redes de interação online Pleasure without condom: new positionings on online interaction networks

Este artigo origina-se de uma pesquisa online sobre os discursos e práticas do barebacking no cenário brasileiro. Neste trabalho discuto algumas comunidades da internet que ressaltam os aspectos positivos do sexo sem camisinha, sem necessariamente serem identificados ou vinculados ao conceito de barebacking. De modo geral, o que ligará todos os discursos (sexo sem camisinha e barebacking) é a busca por experiências mais naturais e livres, sensações e prazeres mais intensos. Portanto, o que está em jogo no sexo desprotegido é a possibilidade de maximização do prazer no contato mais íntimo com o outro.<br>This article originated in online research about the discourses and practices of "barebacking" in the Brazilian context. In this work, I discuss some communities on the internet that highlight the positive aspects of unprotected sex, without necessarily being identified or linked to the concept of barebacking. In general, what connects these discourses (sex without condoms and barebacking) is the search for more natural and free experiences - sensations and pleasures that are more intense. Therefore, I conclude that what is central to unprotected sex is the possibility of maximization of pleasure in the most intimate contact with one's partner