Charakterystyka geologiczno-złożowa węglonośnych utworów górnokarbońskich w obszarze górniczym ZG Sobieski

Abstract

This M.S. thesis shows geological conditions of Jaworzno bituminous coal deposits, which is operates by the Sobieski Mine. The coal field is located in the E part of the Upper Silesia Coal Basin (USCB). In the Sobieski mining area has been exploiting energy coal type 31.1 and 31.2 in the łaziskie and orzeskie beds. The calorific value ranges between 20 and 24 MJ/kg, the average content total sulphur is 1,6 % and ash content is 15,75 %. In this work were introduced the characteristics stratigraphy and lithology coal-bearing strata and tectonic deposits. On the basis released lithostratigraphic profiles from boreholes were carried out an analysis of technological parameters of the coal seams łaziskie and orzeskie beds and it were used to performed top and bottom maps of this beds. Also made thickness of selected coal seams maps. Balance resources of coal came to 919 200 thousand tons.

The object of this paper is to analyze a issue of performance optimization of code which is designed to run on virtual machine environments. Performance optimization is important aspect for code that performs numerical calculations. The first part of this paper focuses on virtual machines technology and basic techniques of code optimization which are usually performed by compilers. The next part presents two non-conventional techniques designed by author which allow to speed up calculation of mathematical operations such as a mantissa of a real number and a metric angle unit conversion from degrees to radians. After that are presented test results of this optimizations which have checked their performance and correctness of generated results. The last part presents tools and techniques which are useful by code optimizing, and tips how to perform optimizations and when it is harmful.