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SourceAvailable from: Sebastian Borowski[Show abstract] [Hide abstract]
ABSTRACT: The anaerobic digestion was investigated using mixed sewage sludge and poultry manure. The experiments showed that a 30% addition of poultry manure to the sewage sludge did not increase specific gas yield (376dm(3)/kgVS versus 384dm(3)/kgVS), however gas production rate as calculated per unit volume was 1.5 higher for sludge and manure mixture. The anaerobic digestion turned out to be inefficient in terms of pathogen treatment, since the reduction of Enterobacteriaceae reached only two logarithmic units. In the course of the digestion processes, nutrients were released to the supernatant, and longer SRT favored that phenomenon. The liquor after the digestion of sludge alone was rich in phosphates (348-358gP/m(3)) and contained a lot of organic carbon (COD of 2705-6034gO2/m(3)). Conversely, more ammonium nitrogen was found in the supernatant after co-digestion of sludge with manure (2094-2221gN/m(3)). However, there was no evidence of ammonia inhibition.Bioresource Technology 05/2013; 142C:345-352. DOI:10.1016/j.biortech.2013.05.047
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ABSTRACT: In the present work, thermal effects in high-power diode lasers are investigated by means of high resolution thermography. Thermal properties of the devices emitting in the 650 nm and 808 nm wavelength ranges are compared. The different versions of the heterostructure design are analyzed. The results show a lowering of active region temperature for diode lasers with asymmetric heterostructure scheme with reduced quantum well distance from the heterostructure surface (and the heat sink). Optimization of technological processes allowed for the improvement of the device performance, e.g. reduction of solder non-uniformities and local defect sites at the mirrors which was visualized by the thermography.Materials Science and Engineering B 09/2012; 177(15):1268–1272. DOI:10.1016/j.mseb.2012.02.024
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ABSTRACT: Fracture toughness, four-point bending strength of transparent spinel, Y2O3 and YAG ceramics in function of temperature (from room temperature up to 1500° C) were measured. Creep resistance at 1500–1550° C was studied too. Grain size distribution was determined on polished and etched surfaces of samples. Fracture surfaces after tests were examined by scanning electron microscopy. The obtained results showed that: in the case of spinel ceramics fracture toughness and strength decreased from 20 to 800° C, increased from 800 to 1200° C and decreased at higher temperature; in the case of Y2O3 ceramics they increased from 400 to 800° C, and next kept constant up to 1500° C; in the case of YAG ceramics they kept constant from 20 to 1200° C and then decreased. The creep strain rate was measured for spinel and YAG but not for Y2O3 ceramics which appeared creep resistant. The hypotheses concerning toughening and creep mechanisms were proposed.Ceramics International 08/2012; 38(6):4517–4524. DOI:10.1016/j.ceramint.2012.02.028
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