Innovation and Entrepreneurship

129-137

Authors: Snejana Dineva

The evaluation of food quality is the crucial question and concern for all governments. Rules and monitoring the food in the food chain is adopted in all countries. There are no doubt that the food closely connected to the human health. One of the most common contaminants are nitrates and nitrites, which have and positive not only negative influence. In this paper are represented the results of the evaluation of the content of NO3- in different products in food chain market in BG. A higher amount of NO3 - up to 900 mg/kg was found in fresh potatoes, with an average of 645 mg/kg. The highest nitrate levels recorded for strawberries were up to 300 mg/kg, with an average of 148 mg/kg. For bananas, an average of 95 mg/kg and for short-grain cucumbers 38 mg/kg. For other vegetables, the NO3- values were within the allowable range. For apricots, kiwi, lemons, limeti <30 mg/kg.

150-163

Authors: Miroslav Mladenov

This article analyzes existing programmable logic controller (PLC) implementation solutions using open source hardware. Their advantages and disadvantages are highlighted. A model of such a controller is proposed. Software has been selected for programming with ladder diagram control programs. Practical exercises related to electric drive control, safety devices, complex object management have been developed. The proposed PLC is suitable for solving various practical problems close to working in real production conditions. Based on the examples provided in this project, the practical exercises developed have been added to an existing e-learning training course.

174-202

Authors: Miroslav Zlatev

The topically of the scientific publication nowadays is driven by the increasing influence of the innovations and intangible assets over the development of our world and the regions. The digital era of intangible knowledge had begun at the end of the XX-th century is complexed and extremely dynamic. The time and space here are being perceived as significant for the social and economic sphere. Obviously, intangible resources and assets are manifested like in the term of these two variations: Space and Time. They evolve as different types according to what they really are. According to Baumann (2001), these publicly-social relationships today stand out with polyvalence, mobility and diversity. Diversity naturally develops competition and contributed processes such as globalization, digitalization and regionalization. The levels of difference and synergy between components of the system affect the spaces different ways, therefore they can change the conditions in the environment