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[en] Highlights: • Sharing economy as new business model for Energy Storage Operators. • More attractiveness of Battery Storage Systems. • Optimal Dimensioning of Battery Storage Systems for sharing economy application. - Abstract: Energy storage systems (ESS) are the candidate solution to integrate the high amount of electric power generated by volatile renewable energy sources into the electric grid. However, even though the investment costs of some ESS technologies have decreased over the last few years, few business models seem to be attractive for investors. In most of these models, ESS are applied only for one use case, such as primary control reserve. In this study, a business model based on the sharing economy principle has been developed and analyzed. In this model, the energy storage operator offers its storage system to different kinds of customers. Each customer uses the ESS for their single use case. A set of different use cases has been identified to make the operation of the ESS profitable (e.g. peak shaving, self-consumption and day-ahead market participation). Different kinds of stationary batteries (lithium-ion, sodium-sulfur and vanadium redox-flow) have been considered as energy storage technologies, which differ both in their investment costs and their technical properties, such as round-trip efficiency. The simulation of the business model developed showed that a sharing economy-based model may increase the profitability of operating a battery storage system compared to the single use case business model. Additionally, larger battery dimensions regarding power and capacity were found to be profitable and resulted in an increased revenue stream.
[en] A short review is given on the use of Rutherford backscattering in crystal analysis. The basic principles of the method are summarized, and the so-called double-alignment technique is discussed. Some examples are shown such as the spectra of Si-monocrystals before and after argon-implantation, localization of As in Si matrix, etc. On the basis of the experimental data information can be obtained on microstructure of the crystals especially in connection with electric measurements. (T.G.)
[en] An ion accelerator for ionometrical analyses of solid states is described. The following problems are treated: high vacuum systems and their operation, small energy spread and beam collimation, system for automatic transmission of the ion beam. Due to the careful optimization of the discussed parameters and to the automatic beam transmission system beam currents of 5-10x10-9 A could be measured for more than 300 hours operation time, with deviations less than 20%. In a one year period the accelerator was in operation for more than 2300 hours. (T.G.)