MVDC Railway Traction Power Systems; State-of-the Art, Opportunities, and Challenges

1 Biopolymers : State of the Art , New Challenges , and Opportunities

The term “biopolymers” usually describes polymers produced in a natural way by living species. Their molecular backbones are composed of repeating units of saccharides, nucleic acids, or amino acids and sometimes various additional chemical side chains contributing also to their functionalities. If the largest part of biopolymers is extracted from biomass, such as polysaccharides from cellulose...

A comprehensive control strategy of railway power quality compensator for AC traction power supply systems

The development of electrical railway systems leads to critical power quality problems in the power grid. This paper discusses a kind of half-bridge-based railway power quality compensator system (HBRPQC) that can compensate negative sequence currents, harmonics, and reactive power simultaneously. In order to keep the HBRPQC performance efficient for the different kinds of transformers used in ...

Review of Challenges and Opportunities Health Information Technology-based Art Therapy in Education and Treatment

Integration of Ders on Power Systems: Challenges and Opportunities

The integration of large amounts of distributed energy resources (DERs) as photovoltaic solar generation, micro-cogeneration, electric vehicles, distributed storage or demand response pose new challenges and opportunities on the power sector. In this paper, we review the current trends on: i) how consumers adopting DERs can self-provide energy services and provide other services at system level...

Collaborative Usage and Development of Models: State of the Art, Challenges and Opportunities

Collaborative usage and development of models is an interesting challenge for modern organizations. While models play a decisive role in the planning, analytics and execution of many processes, active involvement of people other than modeling experts in creating or using models beyond providing information and being queried about the fit of models to their work is rare in practice. This article...