Asad Seif Livres

Mixed convection heat transfer in presence of magnetic field in a lid-driven wavy cavity having vertical fin has been studied numerically in this thesis. The horizontal bottom and top walls are kept at constant heated temperature Th while the vertical wavy walls are kept at constant cold temperature Tc maintaining Th > Tc. A heated fin of length (l) is attached to the hot bottom wall at a position (d) from the left wall having thickness (b). The top wall moves right to left with constant velocity. The gravitational force acts in vertically downward direction and a uniform magnetic field with a constant magnitude in the direction of the moving lid is applied. The physical problems are presented mathematically by different sets of governing equations along with the corresponding boundary conditions. Using a set of appropriate transformations, the governing equations along with the boundary conditions are transformed into non-dimensional form, which is then solved by employing a Finite-element method based on Galerkin weighted residuals. The investigations are conducted for different values of Richardson number (Ri), Hartmann number (Ha), fin lengths (L) but for fixed fin thickness, f

"Because immigration is such a recurring-and divisive-topic in the United States, it is easy to assume that we understand what it means for an immigrant to live under the specter of surveillance and punishment. It is easy to assume, as many scholars and journalists do, that undocumented immigrants live on the run from the authorities, constantly fleeing to the margins of daily life, staying in the shadows beneath the eyes of the law. And yet, while it is certainly true that immigrants are constantly faced with mechanisms of surveillance that function as tools of societal exclusion, this only tells part of the story. As Asad L. Asad shows, many people with a sanctionable status cannot-and, in some cases, do not want to-evade surveilling institutions or the formal records they generate: evading the institutions that keep formal records is a luxury that most immigrants (especially those with children) cannot afford. In Engage and Evade, Asad uses a wealth of interviews and ethnographic observations collected in Dallas County, Texas, bolstered and contextualized by original analyses of national survey data, to explore whether, how, and why immigrants engage with surveilling institutions. Presenting the stories of immigrants living in mixed-status families in which at least two members of the household have different legal statuses, and focusing especially on the experiences of immigrant parents, Asad argues that engagement with such institutions stems as much from hope for societal inclusion as it does from fear of exclusion. By paying attention to the ways in which immigrants make sense of, pursue, and use the records that result from these engagements, Asad reveals a variety of ways these individuals reinforce or resist their sanctionable status through the state's own surveillance"-- Provided by publisher