Ni-doped goethite (α-FeOOH) nanorods were synthesized from mixed Fe(III)-Ni(II) nitrate solutions with various Ni/(Ni+Fe) ratios (0, 5, 10, 20, 33 and 50 mol % Ni) by hydrothermal precipitation in a highly alkaline medium using the strong organic alkali, tetramethyl¬ammonium hydroxide (TMAH). Ni-doped hematite (α-Fe2O3) nanorods were obtained by calcination of Ni- doped goethite nanorods at 400 °C. The Ni2+- for-Fe3+ substitution in goethite and hematite was confirmed by determination of the unit cell expansion (due to the difference in the ionic radii of Fe3+ and Ni2+) using XRPD and determination of the reduction of a hyperfine magnetic field (due to the difference in magnetic moments of Fe3+ and Ni2+) using Mossbauer spectroscopy. Single- phase goethite nanorods were found in samples containing 0 or 5 mol % Ni. A higher Ni content in the precipitation system (10 mol % or more) resulted in a higher Ni2+-for-Fe3+ substitution in goethite, and larger Ni-doped goethite nanorods, though with the presence of low crystalline Ni-containing ferrihydrite and Ni ferrite (NiFe2O4) as additional phases. Significant changes in FT-IR and UV-Vis-NIR spectra of prepared samples were observed with increasing Ni content. Electrochemical measurements of samples showed a strong increase in oxygen evolution reaction (OER) electrocatalytic activity with increasing Ni content.

The main aim of this paper was to describe the activity of the artisan cheese dairy and agri-tourism on the example of the farm “Wańczykówka”, which is located in the village of Krzeszów in the south Lower Silesia. The original source of information was used in the study, which was obtained by direct interview with the owner of the analyzed object. The farm is located in attractive tourist areas and has a good chance of developing non-agricultural activities as an additional source of income. The paper presents the motives for starting a business and characteristics of the farm profile. In addition, it was discussed the sourcing of raw materials and characterized the product variety, as well as the offer of agri-tourism services. The described artisan cheese dairy combined with agri-tourism is an excellent example of pursuing an interesting form of entrepreneurship in the countryside as well as promoting of local quality food. #0#

W referacie zaprezentowano empiryczny model do szacowania tlumienia systemowego dla radiowych sieci BAN pracujących w środowisku promu pasazerskiego przy czestotliwości 2,45 GHz dla komunikacji typu off-body. Badania pomiarowe przeprowadzono dla scenariuszy dynamicznych w pomieszczeniu dyskoteki promu pasazerskiego. Postac analityczna modelu sklada sie z trzech skladowych: tlumienia średniego, tlumienia wynikającego ze zmiennej pozycji anteny na ciele czlowieka oraz tlumienia wynikającego z wystepowania zanikow sygnalu radiowego.

Resistance spot welding (RSW) is considered as the dominant process for joining similar and dissimilar sheet metals in automotive industry. In this paper will be present the strength analyses of spot weld joint and analyse the transition between interfacial and pull-out failure modes for resistance spot weld joints of aluminium and austenitic stainless steel sheet, during the tensile–shear test, by usage analytical and experimental approach. For experimental testing, the specimen of 1 mm and 2 mm thickness were used, welded with different welding parameters. ARTICLE HISTORY Received 11.01.2018 Accepted 26.02.2018 Available 15.03.2018