The article concerns computer modelling of processes in cooling systems of internal combustion engines. Modelling objectives and existing commercial programs are presented. It also describes Author’s own method of binding graphs used to describe phenomena in the cooling system of a spark ignition engine. The own model has been verified by tests on the engine dynamometer. An example of using a commercial program for experimental modelling of an installation containing a heat accumulator is presented.

The article deals with the penny coinage minted in Silesia in the latter half of the 12th century. According to the author, it is very likely that the Polish coinage of Silesia during the period of feudal fragmentation had originated under the rule of two Silesian Piast dukes, brothers Bolesław I the Tall and Mieszko IV Tanglefoot (in the period 1166–1172), responsible for several penny types issued up until the late 12th century and subjected to periodic recoinage. It is also possible that the first two types may have been minted by the Senior Duke Bolesław IV the Curly, although the author believes that this hypothesis is less plausible.

Objectives: The OSCE (Objective Structured Clinical Examination) is a common method of assessing clinical skills used at many universities. An important and simultaneously difficult aspect of good examination preparation is obtaining a properly trained and well-motivated group of assessors. To effectively recruit and maintain cooperation with assessors, it is worth knowing their opinion. The aim of this study was to investigate the opinions of teacher-examiners about the OSCE and to identify the factors that could shape this opinion and influence on motivation.

Methods: A cross-sectional study was conducted using a questionnaire on teachers who participated as OSCE examiners. This questionnaire consisted of 21 questions about their perceptions. Answers were rated in a five-point Likert-type scale. Chi-square or Fisher’s exact test was used to analyze the data.

Results: A total of 49 (out of 52) teachers participated in this study. Nearly 90% of examiners believed that it is fair, and more than 90% that it is transparent. Despite the fact that 67% of examiners believe that the examination is difficult to organize and 71% believe it is stressful for students; according to 72% of respondents the OSCE has a positive effect on learning. More than 91% of examiners believed that the OSCE is an appropriate test to assess students’ skills. Opinions about the examination were independent of specialty, seniority, gender or having taken the OSCE as students.

Conclusion: Teacher-examiners viewed the OSCE as a fair and transparent examination, adequate for the assessment of skills and, despite it being difficult to organize, worth doing as it is appropriate to assess practical skills and positively influences students’ motivation to learn tested skills.

The aim of this paper is to investigate the effect of thermal stratification together with variable viscosity on free convection flow of non- Newtonian fluids along a nonisothermal semi infinite vertical plate embedded in a saturated porous medium. The governing equations of continuity, momentum and energy are transformed into nonlinear ordinary differential equations using similarity transformations and then solved by using the Runge-Kutta-Gill method along with shooting technique. Governing parameters for the problem under study are the variable viscosity, thermal stratification parameter, non-Newtonian parameter and the power-law index parameter.The velocity and temperature distributions are presented and discussed. The Nusselt number is also derived and discussed numerically.