Job Scheduling in Computational Grids is gaining importance due to the need for efficient large-scale Grid-enabled applications. Among different optimization techniques designed for the problem, Genetic Algorithm (GA) is a popular class of solution methods. As GAs are high level algorithms, specific algorithms can be designed by choosing the genetic operators as well as the evolutionary strategies such as Steady State GAs and Struggle GAs. In this paper we focus on Struggle GAs and their tuning for scheduling of independent jobs in computational grids. Our results showed that a careful hash implementation for computing the similarity of solutions was able to alleviate the computational burden of Struggle GA and perform better than standard similarity measures. This is particularly interesting for the scheduling problem in Grid systems, which due to changeability over time, has demanding time restrictions on the computation of planning the jobs to resources.
The study presents experimental investigations of spatial turbulence intensity and scales of turbulent eddies (macroeddies) in a rectangular channel and the impact of the hydraulic jump on their vertical and streamwise distributions over a flat and scoured bed. The results of four tests and two different discharge rates are presented. Intensive mixing caused by the hydraulic jump has an impact on the instantaneous velocity, turbulence intensity and sizes of macroeddies, as well as their vertical and longitudinal distributions along the channel. The largest differences in turbulence characteristics were reported directly after the hydraulic jump, above the eroded bed. The interaction between the stream of the increased turbulence and the bed is a direct cause of formation of scour downstream water structures, which has a great effect on overall flow characteristics. The scour hole that arose downstream the jump moderated, in a small degree, the turbulence intensity at its end. Just next to the hydraulic jump only the small longitudinal relative sizes of macroeddies were present, while at the end of the analyzed reach, downstream of the scour, the relative scale reached around 1.5 depth of the stream.
Summary: In the present paper indications have been presented that:
(1) Kernels with tangled magnetic lines of force occur in solar flares.
(2) Random (turbulent) motions occur in hot flare plasma.
(3) A MHD turbulence can explain huge flare energy release (plasma heating. electron and proton acceleration).
(4) It has been also shown that a MHD turbulence can efficiently develop in a strong magnetic field in the solar corona.
On this basis it is suggested that the MHD turbulence is Ihe basic mechanism of the flare energy release.
In May and June 2013 Turkey witnessed one of the longest and biggest social unrests in its modern history. Protesters all around the country rebelled against the government's authoritarian tendencies and police violence, exemplified by the hars treatment of activists resisting the reshaping of Istanbul's favorite Taksim Square and the adjacent Gezi Park. This essay address the origins, development and outcomes of the Turkish "Occupy Gezi" movement. It seeks the roots of the movement on three interdependent levels centered around the uses and misuses of public space and the instrumentalization of civil society in the hegemonical political discourse. Accordingly, the demonstrations are analyzed as (1) a critique of neoliberal developmentarism in Turkey, reflected in the marketization/commodification of public space and the destruction of the envoronment; (2) as a critique of the majoritarian, non-inclusive concept of democracy that accompanies neoliberal economic policies in Turkey and has manifested itself in the attempt to appropriate public space and to gain effective control over "disloyal" elements of society; and (3) finally as a critique of state paternalism, its most palpable effect being the imposition of conservative values, the distaste for alternative life-styles and the construction of a homogeneous mass of "Turkish citizens" adhering to similar values. We argue that the alleged Islamism of the ruling AKP played only an accessory role in the outbreak and development of the protests. What was an ecological protest and outcry at non-participative urban transformation in the beginning turned into a widespread popular happening whose participants tried to create an alternative to the bureaucratic machinery of the neoliberal state and the increasingly authoritarian behavior of its representatives who are unresponsive and unsensitive to the frustrations of oppositional voices, non-religious classes and different life-styles., Petr Kučera., and Obsahuje bibliografii
Comparisons of the recent protests in Turkey to the Arab Spring are met with negative responses among representatives of the Turkish governmnet as well as those criticizing the govemment. The attitudes of political opponents emphasizing the difference between Turkey and the other Middle Eastern countries show the impact of Orientalism on Turkish identity as well as perceptions of Turkey's role as a model for (not only) Middle Eastern Muslim countries., Jitka Malečková., and Obsahuje bibliografii