This paper concerns laminar countercurrent gas–liquid ow over a wavy wall column, in the case of a falling liquid lm. The modelling concerns the coupling of hydrodynamic and heat and mass transfer for an absorption as an example of application. The falling liquid lm interacts, through the free interface, with the gas phase. The wavy surface generates particular hydrodynamic conditions with the ...

The most likely way that the wall material might affect the sound produced is through its influence on the structural vibrations of the instrument. Recent experiments by Whitehouse et al have shown that blowing a lip-reed instrument excites vibrations in the instrument walls, primarily due to the motion of the oscillating lips against the mouthpiece [5, 6]. The amplitude of these vibrations dep...

In some plant species, including Arabidopsis, fertilization induces the epidermal cells of the outer ovule integument to differentiate into a specialized seed coat cell type with a unique morphology and containing large quantities of polysaccharide mucilage (pectin). Such seed coat mucilage cells are necessary for neither viability nor germination under normal laboratory conditions. Thus, the A...

The free motion of a rigid one-dimensional stick colliding elastically within an innnitely massive circular wall is rst shown to be equivalent to the three-dimensional motion of a billiard ball within a spiral column and then mapped onto a two-dimensional billiard problem with a rotating billiard wall. Indications that such a system has chaotic orbits and can possess integrable orbits is provid...

AIM OF THE STUDY To evaluate the results of acetabular fractures surgically treated using posterior Kocher-Langenbeck approach for internal fixation. METHODS A series of 42 consecutive cases treated during a 4 year period was analysed. The mean age of the patients was 41 years. According to the Letournel classification 9 posterior wall fractures, 3 posterior column fractures, 11 transverse fr...