In this paper a scheduling policy is presented which minimizes the average delay of the users. The scheduling scheme is investigated both by analysis and simulations carried out in the context of Orthogonal Frequency Division Multiplexing (OFDM) broadcast channels (BC). First the delay optimality is obtained for a static scenario providing solutions for specific subproblems, then the analysis i...

Photovoltaic systems inherently generate pollutants over their entire life-cycle. To study the environmental impact of products, an inventory of all energy and material inputs for the product is made, including all emissions to the environment. This life cycle inventory is subsequently used to calculate the size of various impact indicators, such as land-use, depletion of resources, contributio...

The European Commission has funded COMET (Computerized Molecular Evaluation of Toxicity), a project to evaluate the possibility to predict a series of toxic and ecotoxic endpoints. This research will focus on the relationship between chemicals and their toxic and ecotoxic effects investigated through updated computerized approaches. The major objective of COMET is to extract as much as possible...

Nanocolloids (Ncs) are highly dispersed mixtures of nanoscale (1–100 nm) heterogeneous systems, which ubiquitous in aquatic environments. Ncs considered a vital pollutant carrier due to their special surface properties and unique hydrodynamic characteristics. They play an essential role the process promoting migration transformation. In recent years, with increase chemicals environment complexi...

The manufacture of egg yolk powder by spray drying requires regular cleaning in order to remove fouling deposits and prevent microbiological growth on the pasteurisation heat exchanger dryer. A life cycle assessment (LCA) study a typical manufacturing plant, using literature data, indicated that breaking, storage steps were major contributors plant’s environmental impacts rather than cleaning-i...

The toxicity and ecotoxicity effects, handling disposal of synthetic amorphous silica nanoparticles aerogels are reviewed discussed.

Environmental context Many human activities cause the release of plastic and associated plasticisers to land, where chemicals may persist for extended periods be taken up by organisms. However, quantitative information terrestrial occurrence, fate exposure phthalate non-phthalate is lacking. Research into this field needed, especially as society moves away from phthalates next generation which ...