Abstract Laser beam machining (LBM) is one of the most widely used thermal energy based non-contact type advance machining process which can be applied for almost whole range of materials. This paper defines mathematical models for surface roughness prediction (Ra, μm) and width of heat affected zone (HAZ, mm) during laser cutting of alloy steels 1.4571 and 1.4828 with nitrogen as assist gas. For defining appropriate mathematical models multiple regression analysis is used with four independent variables. Following parameters are varied: cutting speed, focus position, nitrogen assist gas pressure and stand-off. Obtained mathematical models describe dependence of Ra and HAZ from varied process parameters.

Abstract This paper deals with modeling and simulation of multibody systems consisting of rigid and flexible bodiesactuated by hydraulic motors. To develop the corresponding modelbond graph technique is used thatprovides a systematic component oriented methodology. The proposed procedure is explained on the example of arotary crane.The simulation model was developed and simulation conducted using BondSim© program. The model developed is based on physical modeling philosophy by systematically decomposing it into the components and using the models from theprogram library. Mathematical model of the system may be machine generated in the form of differential algebraic equations (DAEs) and solved using a solver capable of solving such models up to semi implicit index two models.

The exact incidence and mortality rate in Bosnia and Herzegovina are unknown as there are no National Cancer Register. The available data are mostly based on the estimation from neighboring countries. Therefore, the aim of this study was to present the preliminary but more accurate estimates of cervical cancer incidence and mortality rates in Bosnia and Herzegovina. The data on cervical cancer cases in Bosnia and Herzegovina were collected from different sources and varies depending on the size of the city or region. To calculate the crude rates for the period from 2000 to 2008, we used the Bosnian and Herzegovinian population census for 1991. Thus, the crude incidence rate in Sarajevo region is more equable (app. 30.4/100,000 women-year), while in Tuzla Canton it varied from 18.5 in 2005 to 4.8/100,000 in 2000. In Tuzla Canton, in the period 1993-2006, 27.1% of all women with cervical cancer were younger than 30. However, the exact crude incidence in Bosnia and Herzegovina could be even higher. Data from Tuzla Canton showed slight increase in mortality rate in the last 5years (4.9/100,000), with the peak in 2007 (7.0/100,000). The presented data reflects the situation throughout Bosnia and Herzegovina and underline the necessity of the implementation of cervical cancer register and organized screening program.