We present explicit formulae for the eccentric connectivity index and Wiener index of 2-dimensional square and comb lattices with open ends. The formulae for these indices of 2-dimensional square lattices with ends closed at themselves are also derived. The index for closed ends case divided by the same index for open ends case in the limit N →∞ defines a novel quantity we call compression factor. This factor was calculated for both eccentric connectivity and Wiener index for 2- dimensional square lattice.

The paper also synthesizes a feasible process structure that can be applied for the process of fractional crystallization, and gives a simulation of the process by calculating the material balance of the process. The parameters of relevant process paths that were obtained prove that the process presented in this paper is feasible in practice and applicable in industry.

Slavonian Kulen (SK) is traditional dry sausage produced in the region of Slavonia in eastern Croatia. It is made from mince of pork, back fat, spices and salt filled into pork cecum. After stuffing, the sausages are cold-smoked and ripened-dried afterward for several months. Present work aimed to analyse some physicochemical and organoleptic traits of ripe SK as well as the safety of final product. The SK samples (n=12) from different small-scale manufactures were analysed. The following physicochemical attributes were recorded: moisture 38.2%±3.6, protein 35.0%±3.1, fat 23.7%±4.6, moisture/protein ratio 1.1±0.1, pH value 5.37±0.23 and water activity (aw) 0.82±0.02. Mean organoleptic scores, on five-point scale, were 3.7±0.6 for surface appearance, 3.4±0.6 for surface smell, 3.8±0.5 for consistency, 3.2±0.4 for inner smell, 3.0±0.7 for cross section quality, 3.3±0.5 for texture, 3.1±0.4 for taste and aroma, 3.0±0.5 for after taste and 3.2±0.4 for overall quality. Regarding the product safety, the following results (per kg) were determined: histamine 330.8 mg±126.3, tyramine 233.9 mg±124.7, nitrite 6.55 mg±3.88 and benzo(a)pyrene 0.05 たg±0.03. Salmonella spp. and L. monocytogenes have not been found in any sample while counts of S. aureus, enterobacteria and sulfite-reducing clostridia were in accordance with regulations.