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The impact of micro-organism activity on the biodrying process

Abramczyk Ł., Domińczyk A., Ślęzak R., Cichowicz R. A.

Acta Innovations

2014

no. 13

5--11

The biodrying process was carried out in a bioreactor with a capacity of 240 dm3. The research utilized digested sludge from a sewage treatment plant and an organic fraction of municipal solid waste. The dry mass, dry organic mass, temperature, and respiration index of the dried material were determined during the biodrying process. Because of the waste biodrying process for ten days, the amount of moisture removed was 51.7%. The greatest activity of microorganisms in the waste was on the fourth day of the process, when the temperature reached the maximum value of 58°C in the top layer of waste in the middle of the bioreactor.

Change of pressure along the contact lines in worm teeth

Sabiniak H., Cichowicz R.A.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2006

z. 68 [231]

181-184

A dynamic development of numerical methods enables even so complicated geometrical modelling as modelling of hypoidal teeth, and in particular of worm teeth. Building on the basis of the finite element method of this type of geometrical mathematical model enables observing and analysing physical phenomena taking place in the teeth, e.g. changes of pressure distribution along the contact lines depending on the phase of meshing for particular cooperating pairs of teeth. Due to limited technical possibilities and mathematical apparatus such analyses were carried out only on the basis of the theory of plates with constant thickness. An unquestionable advantage of such numerical modelling is a short time needed, to obtain final results, which enables profound analysis of the transmitted load. The knowledge of course of pressure distribution along the contact lines of particular pairs of intermeshing teeth in worm gears already in the design phase enables taking into consideration n adequate correction or even modification of the working surface of teeth, with the aim to equalise the distribution of pressure.