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We propose a liquid-based electrostatic energy harvester that uses ferrofluid droplets. The proposed device consists of top and bottom plates with conducting electrodes coated with a solid dielectric layer, a conducting liquid, and oil-based ferrofluid droplets. Using an external magnetic field, we experimentally verified the surfaces on which the ferrofluid actuates well. In addition, we investigated...
In order to study the applicability of the electrical resistance measurement for damage analysis of carbon yarns, pullout tests on yarns embedded in concrete as well as tensile tests on yarns were carried out. A qualitative correlation between the load drop and the increase of the electrical resistance could be observed in the pullout tests and tensile tests, respectively. The resistance measurement...
A ring D is called an SFT ring if for each ideal I of D, there exist a natural number k and a finitely generated ideal $${J\subseteq{I}}$$ such that ak∈J for each a∈I. We show that the power series ring $${D[\![x_1,\ldots, x_n]\!]}$$ over an SFT Prüfer domain D is again an SFT ring even if D is infinite-dimensional. From this, it follows that every ideal-adic completion of D is also an...
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