As a result of structural transformations in agriculture the previous foresights for energy demands in rural areas became out-of-date. Paper presents the results of study on changes in electric power ...consumption by rural consumers on an example of one village in Masurian Lake region. All the farms were supplied with energy from typical 15 kV electric line. On the basis of investigation the trends of changes in electric power consumption were determined. Further studies on electric energy consumption covering extended number of rural consumers were recommended
Oxide materials are of current interest as high-temperature thermoelectrics in the automotive and manufacturing energy-harvesting sectors due to high chemical robustness, low toxicity and low cost. ...Driven by a need to improve the thermoelectric performance of n-type oxides to the level of p-type analogues, ceramics and composites based on donor-doped SrTiO3 are considered as a promising material. Here Nb-doped SrTiO3 with Nb content of 10 and 15% as well as Sr/(Nb + Ti) ratio of 1.00 and 0.98 was mixed with 0.6 wt. % of graphene oxide (GO) prepared by Hummer-based method and conventionally sintered in atmosphere of H2/N2 to reduce both Nb-doped SrTiO3 and GO. Addition of reduced GO in combination with introduction of Sr vacancies provides a synergistic effect of fastening charge transport and thereby increasing electrical conductivity σ and suppressing the thermal conductivity κ. These factors, together with a moderate Seebeck coefficient S, result in a high power factor PF = S2 × σ up to ∼1.98 mW/(K2m) and thermoelectric figure of merit ZT = PF × T/κ up to 0.29. These findings offer further prospects for seeking high performance SrTiO3-based thermoelectrics by modification with reduced GO.
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