Nonlinear combining of laser beams

We propose to combine multiple laser beams into a single diffraction-limited beam by the beam self-focusing (collapse) in the Kerr medium. The beams with the total power above critical are first combined in the near field and then propagated in the optical fiber/waveguide with the Kerr nonlinearity. Random fluctuations during propagation eventually trigger strong self-focusing event and produce diffraction-limited beam carrying the critical power.Comment: 5 pages, 5 figure

Sub-Weibull distributions: generalizing sub-Gaussian and sub-Exponential properties to heavier-tailed distributions

We propose the notion of sub-Weibull distributions, which are characterised by tails lighter than (or equally light as) the right tail of a Weibull distribution. This novel class generalises the sub-Gaussian and sub-Exponential families to potentially heavier-tailed distributions. Sub-Weibull distributions are parameterized by a positive tail index $\theta$ and reduce to sub-Gaussian distributions for $\theta=1/2$ and to sub-Exponential distributions for $\theta=1$. A characterisation of the sub-Weibull property based on moments and on the moment generating function is provided and properties of the class are studied. An estimation procedure for the tail parameter is proposed and is applied to an example stemming from Bayesian deep learning.Comment: 10 pages, 3 figure

Digitization of Cultural and Historical Heritage of Armenians in Bulgaria - Priorities and Perspectives

The paper deals with digitization as a method of protecting and preserving cultural and historical heritage of Armenians in Bulgaria. It attempts to establish the level of development of this process in the country, to identify the good examples and information gaps in order to outline the priorities and perspectives

The brand image of Malta as a tourism destination: a case study in public relations and corporate communication practice

Place branding and country branding are evolving concepts, which continue to engage attention. This paper reviews the conceptual foundation of place branding and its application to public relations and corporate communication practices in the island state of Malta, a popular tourist destination in the centre of the Mediterranean Sea. The Maltese authorities use communication practices to develop Brand Malta and the study shows how the image of Malta is used to position its offer in the valuable UK market. Tourism is vital to the Maltese economy and the authorities need to create a favourable image and a strong brand. A number of interviews were carried out with representatives from the Malta brand promoter, Malta Tourism Authority (MTA) to establish the brand strategies and communications approaches adopted for rebranding and repositioning in the market. In addition two tour operators were contacted, who specialize in promoting Malta, to illustrate the practices of the private sector and their coordination with the Maltese authorities. The findings are analysed in accordance with the theoretical frameworks featured in the literature. The studies show that Malta has achieved some success in developing and sustaining the brand in a competitive tourism market. Niche propositions and added value have been important. A coherent approach to public relations and a corporate communication rationale do provide a strategic framework which helps competitiveness and sustains overall value