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Ecosystems are open adaptive systems with self-organizing properties; they are based on local interaction of the composing elements and generating a general end-result. Digital ecosystems incorporate these features in context-aware applications that work together for the efficient solving of complex dynamic problems. This article considers the digital ecosystems as being open-system of applications with a certain degree of context-awareness. It also presents Econtxt a programming model for the context used by cont...

The paper presents a method for calculating and determining the environmental impact of the metallic material production in the specific shop of the machine building plant. Using mass balance equation, main pollutant emissions and by-products like CO, SO2, NOx, Heavy metal particles, slag, mud or volatile organic compounds were determined in the case of 1000 Kg steel, copper, aluminum and zinc production. Measurements were made with an original stand measuring emissions and by-products even in the work area operat...

The paper presents a new method for reconditioning of automotive parts in an ultrasonic field by reworking. Experimental results were obtained in the case of using different material couples. Using three couples of different materials, three technological metallization processes were studied: - oxy-fuel flame and wire; - three-wire electric arc - oxy-fuel flame and powder In experimental work the following material couples were studied: X30NiMoVCr11-STELLITE 12 AWS, X30NiMoCr11-TP 4000, FxMo1Si24-STELLITE 12AWS. D...

Pesticides alter the biological properties of the soil, leading to a complete loss of their fertility. Chestnut soils (meadow brown, light brown) are resistant to contamination by pesticides and by fertilizers in particular. We have carried out studies on the effect of the examined soil pollution with high doses of fertilizers and pesticides on the soil mesofauna representatives. The work is based on studying influence of anthropogenic impacts on soil biological activity in comparison with its main indicators, whi...