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Low-frequency harvesters are attractive due to their availability in the ambient environment. The paper presents the design, analysis and optimization of the magnetic levitation harvester. A new nonlinear model of the electromechanical coupling, depending on the magnet position versus coil is proposed. Additionally, the influence of magnetic suspension (stiffness), load resistance and magnet-coil configuration on the foldover effect is shown.

In this paper, the pyrolysis treatment of sewage sludge was studied in a laboratory fixed bed reactor at temperature range of 400~600 ⁰C. Meanwhile, the influences of the final pyrolysis temperature, the heating rate and ZnO additive on the characteristics of the resulting bio-oil were also investigated. The experimental results indicated that more than 35% bio-oil yield was achieved at a pyrolysis temperature range of 500~600 ⁰C and a heating rate of 5 ⁰C/min. Meanwhile, ZnO has some contributions to the vaporation of the volatile in the sewage sludge. Moreover, heavy oxygenated hydrocarbons in the bio-oil are as high as 90%, which should be updated and then reused as fuel.

India has witnessed a substantial growth in the production of plastics and an increased consumption of plastic. In the absence of adequate waste collection and segregation process, the management of the waste created by discarded used plastics items, especially ones used for packaging applications has become a challenging task. This article provides an overview of the resource recovery from plastic waste with consideration of integrated waste management (IWM), to evaluate the best possible option for tackling waste in Indian circumstances.