4 research outputs found
Testing fertilizing properties of selected composts from the green waste
Due to continuous economic development and an increase of the amount of the produced wastes the main purpose of the word waste management is to decrease the amount of the municipal wastes destined to landfills. It refers mainly to biodegradable wastes. Since the participation of organic components in the municipal wastes constitutes approximately 40%, the aim is to introduce them again into natural circulation. Hence, the significance of biological transformation of wastes by composting increases. It is the most ecological way, and the least detrimental to the environment. The main direction in the recovery of the wastes is production of organic manures and components for making composts. The purpose of tests carried out on selected composts from the green waste was to determine their fertilizing properties in the light of suitability for fertilizing soil, reclamation of post-industrial areas and arranging urban greenery.Ci膮g艂y rozw贸j gospodarczy oraz wzrost ilo艣ci wytwarzanych odpad贸w sprawiaj膮, 偶e g艂贸wnym celem w 艣wiatowej gospodarce odpadami jest zmniejszenie ilo艣ci masy odpad贸w komunalnych kierowanych do sk艂adowania. Dotyczy to g艂贸wnie odpad贸w ulegaj膮cych biodegradacji. Udzia艂 sk艂adnik贸w organicznych w odpadach komunalnych stanowi oko艂o 40%, dlatego d膮偶y si臋 do powt贸rnego wprowadzania ich do naturalnego obiegu. Ro艣nie zatem znaczenie biologicznego przetwarzania odpad贸w poprzez kompostowanie, kt贸re jest najbardziej ekologiczne oraz najmniej uci膮偶liwe dla 艣rodowiska. G艂贸wnym kierunkiem w odzysku odpad贸w jest produkcja nawoz贸w organicznych oraz komponent贸w do otrzymywania kompostu. Badania przeprowadzone na wybranych kompostach z odpad贸w zielonych, mia艂y na celu okre艣lenie ich w艂a艣ciwo艣ci nawozowych. Oznaczenia wykonano pod k膮tem przydatno艣ci do cel贸w rolniczych
Aluminosilcate glass cenospheres as a component of cast magnesium matrix composites
The main characteristic of aluminosilicate glass cenospheres and their possible use as a component of magnesium matrix composites were presented. The results revealed that particular parts of cenospheres differ insignificantly from each other and it depends on which power plant cenospheres come from. The characteristic of cenospheres concerned their structure and phase composition and dimensions such as: wall thickness and size of pores occurring in walls, depending on cenospheres origin. Thickness of cenospheres walls and pore size were measured by using ImageJ computer software. The structure of aluminosilicate glass cenospheres and their phase composition have been investigated by scanning electron microscopy and X-ray diffraction (XRD). The possibility of cenospheres utilization in the fabrication of magnesium matrix composites was presented on the example of AZ91 magnesium alloy composite with fly ash cenospheres. Composite was fabricated by pressure infiltration method
Registration of Melting and Crystallization Process of Ultra-light Weight MgLi12,5 Alloy with Use of ATND Method
To the main advantages of magnesium alloys belongs their low density, and just because of such property the alloys are used in aviation and rocket structures, and in all other applications, where mass of products have significant importance for conditions of their operation. To additional advantages of the magnesium alloys belongs good corrosion resistance, par with or even surpassing aluminum alloys. Magnesium is the lightest of all the engineering metals, having a density of 1.74 g/cm3. It is 35% lighter than aluminum (2.7 g/cm3) and over four times lighter than steel (7.86 g/cm3). The Mg-Li alloys belong to a light-weight metallic structural materials having mass density of 1.35-1.65 g/cm3, what means they are two times lighter than aluminum alloys. Such value of mass density means that density of these alloys is comparable with density of plastics used as structural materials, and therefore Mg鈥揕i alloys belong to the lightest of all metal alloys. In the present paper are discussed melting and crystallization processes of ultra-light weight MgLi12,5 alloys recorded with use of ATND methods. Investigated magnesium alloy was produced in Krakow Foundry Research Institute on experimental stand to melting and casting of ultra-light weight alloys. Obtained test results in form of recorded curves from ATND methods have enabled determination of characteristic temperatures of phase transitions of the investigated alloy