Web application of movie catalogue with React

In modern digital society, the requirements for digital services applies its influence in developing new tools for building web applications. One of those tools is React, an open-source front-end library for creating user interface (UI) for websites and web applications with responsive design. Proof of the popularity and the advantages of React is the number of websites and web applications, which use it (according to the statistics, they are more than 11 million). The aim of the article is to reveal the main characteristics and advantages of React technology by comparison with another web tool Angular and. to present a web application for movie catalogue, developed with JavaScript and React library. It consists of Home page, Catalogue page (movies), About Page, Login page, Register page, and a Sign-out button. Main functionalities: non-register users (guests) can only view the page. A guest can register as a new user or login if it is already registered. The users can create new elements (movie publication), edit or delete their own publication. If a user is not an owner of the publication, they can comment or like other user’s publications

Secondary air interaction with main flow in axial turbines

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2011.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from student submitted PDF version of thesis.Includes bibliographical references (p. 155-157).Secondary air, known as purge air, is injected through seals in the hub and shroud of axial turbines to prevent hot gas ingestion into the endwall cavities. An investigation into the interaction of purge ow with turbine main ow has been undertaken, to determine where losses are generated, how they are generated, and what are the most eective ways for reducing them. The eect of purge ow design on the system's susceptibility to ingestion was also studied. Tools developed for accomplishing these objectives include: a consistent framework for isolating entropy generated due to viscous effects, a procedure for factoring out individual loss categories, and a linear model for secondary air ow response to the main flow pressure field. These tools, applied to steady computations, elucidate four routes through which change in loss generation is brought about by purge air injection: a shear layer between purge and main streams, modification of the secondary ow through the blade passage, an increase in degree of reaction, and the potential for reducing tip clearance ow (for the case of purge ow injected from the shroud). It was further determined that purge air mass ow and swirl velocity are eective parameters for mitigating loss, with a potential for 70% reduction in purge ow losses. By contrast, purge slot axial inclination and gap width do not affect the loss characteristics of purge ow by more than 6%. The benet of pre-swirling purge ow can be negated by decreased sealing effectiveness, if ingestion is driven by the pressure non-uniformity associated with the rotor upstream in influence. However for a representative vane-rotor stage, in which the vane-induced circumferential pressure non-uniformity dominates in the intra vane-rotor gap, pre-swirling purge flow can be beneficial to deterring hot gas ingestion. Finally a framework has been formulated for assessing the time-averaged impact of unsteady vane-rotor interaction on purge ow-induced loss generation. Preliminary results suggest that ow unsteadiness can result in substantially higher losses associated with purge flow injection.by Metodi B. Zlatinov.S.M

Economic Aspects of Migration Processes in Bulgaria

The article studies the development of migration processes to and from Bulgaria and their impact on the country’s economic development. More specifically, it addresses the characteristics and trends of emigration from Bulgaria and those of immigration to the country. The aim is to explore the complex internal structure and trends in individual migration flows in a very interesting historical period in which two strong external factors influence Bulgaria, the EU and the whole world in general – the Global financial and economic crisis and the refugee crisis. In this environment, the processes are developing dynamically, changing the balances in the various migrant groups and increasing the unpredictability of migration. The article firstly presents the European labor market and the free movement of people as external environment of migratory movements. It studies all structural features outgoing migration, then the characteristics of incoming migration to the country. Lastly, it assesses the demographic and economic effects of immigration. Instead of a conclusion the article draws some recommendations on some effective policies to deal with the negative effects of emigration