We analyze the refocusing properties of time reversed waves that propagate in two different media during the forward and backward stages of a time-reversal experiment. We consider two regimes of wave propagation modeled by the paraxial wave equation with a smooth random refraction coefficient and the Itô-Schrödinger equation, respectively. In both regimes, we rigorously characterize the refocus...

The more that information and communication technologies become central to modern society, the more it is imperative to identify, and to manage the development of the skills and abilities required to use them. Within both academic and policy discourses, the concept of media literacy is being extended from its traditional focus on print and audiovisual media to encompass the internet and other n...

Purpose This article reports on research conducted inside British national media organizations. Interviews were conducted with journalists working in newsrooms at the BBC, Sky News, The Guardian and the Financial Times. The research was designed to investigate the impact on the working practices of journalists of the process of production convergence – the trend towards news reporting in more t...

Briefly, based on the previous evidence and the results of the present study, it seems that infection with HTLV-1 by destruction of sub-layers of arteries, especially the intima layer, leads to disruption of the integrity of sub-layers of arteries and through various mechanisms, causing the sub-layer’s destruction, increasing the intima-media thickness, changing the lipid profile, and developme...

BACKGROUND Primary cultures of embryonic neurons have been used to introduce a model of neurons in physiological and pathological conditions. However, age-related cellular events limit this method as an optimal model in adult neurodegenerative diseases studies. Besides, short-interval changing media in previous cultures decreases the effectiveness of this model. As an example of this matter, we...

1 of 18 5/10/2003 7:03 PM Hacktivists or Cyberterrorists? The Changing Media Discourse on Hacking by Sandor Vegh This paper scrutinizes the language of government reports and news media sources to shed light on their role in forming a negative image of politically motivated hacking in general, and online political activism, in particular. It is argued that the mass media's portrayal of hacking ...

Introduction of the 7-valent pneumococcal conjugate vaccine (PCV-7) has been associated with a modest reduction in the incidence of acute otitis media (AOM) and a shift in the etiology of AOM pathogens. In both rural and suburban settings in which use of PCV-7 has been widespread, there has been a decrease in AOM episodes caused by Streptococcus pneumonia, the predominant AOM pathogen in the pr...

this study tries to review the reasons for which young girls tend to perform beauty surgeries on their faces, within the framework of veblen’s “theory of the leisure class” and his “social models” such as fiscal ownership. the statistical society has been the girl students of the university of tehran selected through snow ball sampling and discourse analysis was applied to analyze the semi-stru...

BACKGROUND There has been sizable debate and widespread skepticism about the effect of continuing medical education (CME) on the performance of physicians in the practice setting. This portion of the review was undertaken to examine that effect. METHODS The guideline panel used data from a comprehensive review of the effectiveness of CME developed by The Johns Hopkins Evidence-based Practice ...