No abstract

In recent decades, the technological devices have become a big burden for the environment. In fact, the production processes are depleting the natural resources and the end-of-life processes are emitting big amounts of heavy pollutants and toxic gases. Today, there is an agreement among researchers that the environmental issues must be considered from a life cycle perspective. In order to reduce the negative impacts of technologies on the environment, the best scenario would be to extend their lifespan. However, an old device, is usually linked to low performances, low profit for the manufacturer, additional reparation costs, high risks, etc. In this paper, the Double-Eco (DE) model, an evaluation platform of the compromise between the performances, cost, ecology, safety and lifespan is developed. Also, the environmental impacts of the lifespan are highlighted through the example of personal computers (PCs) and the DE model is applied to three types of grease lubrication as case of study. The results show that (1) evaluating a technology with all its aspects is efficient when deciding whether to extend its lifespan (2) based on the DE model, the lubrication with the longest lifespan has a better evaluation than the two other studied cases.

No abstract

In the 21st century, as it is important to produce products with high quality, hybrid properties, multi functions, low cost, Eco-friendly and so on, the most of manufacturers need several daring plans, unique ideas, new technologies.Therefore a software for creating new materials with hybrid properties desired from many designers was developed and evaluated. Young's modulus, density, coefficient of linear expansion, specific heat and thermal conductivity for several properties were calculated by the software. This software has two functions which are (1) the calculation of the properties regarding the new composite material, with the selection of components and their component ratio and (2) the calculation of the composite materials and their component ratio for achievement of the desired properties. The software was evaluated by the several experiments. It is concluded from the results that; (1) the proposed software could calculate Young's modulus, density, coefficient of linear expansion, specific heat and thermal conductivity for new material, (2) this software has two functions which are both for the calculation of properties of a new composite material and for the calculation of component materials and their component ratio for achievement of the desired properties, (3) accuracy of the calculations using the software is about 7%, (4) the software was very effective and useful for development of a new composite material with several hybrid properties.