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Search Results: 1 - 10 of 2972 matches for " Andrzej Boczkowski "
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Reducing Health Risks Arising From Child and Adolescent Labor
Kinga Polańska, Wojciech Hanke, Andrzej Boczkowski, Ewa W growska-Koski
International Journal of Occupational Medicine and Environmental Health , 2006, DOI: 10.2478/v10001-006-0019-4
Abstract: Objectives: The aim of the study was to work out a program that would help develop the most effective methods for protecting the safety and health of young workers. Materials and Methods: The program was designed by a multidisciplinary team of experts in occupational and public health, occupational hygiene, health promotion, sociology, and regulatory and control activities. Results: The program points out the major aspects to be considered while implementing the existing legislation. The employers should have a proper recognition of health hazards related to working conditions at their enterprises. These should be considered while assessing work capability of adolescents during the pre-placement and periodic medical examinations. Prophylactic examinations for adolescent workers should be oriented towards the potential or existing health hazards and strenuous conditions of in-plant vocational training. It is essential to inform them about work-related health hazards and the preventive methods to be applied by both the workers themselves and the occupational health services. If a health problem or ailment is detected by an occupational physician, the adolescent worker should be referred to primary health care unit for further diagnostics. Conclusions: The most effective ways to protect the safety and health of young workers include a more accurate assessment of working conditions, contracting prophylactic examinations with only one occupational health service unit, providing appropriate risk information to adolescent workers/students, and a closer collaboration between school administration, employers and occupational health services.
Extended Extremes of Information Combining
Lucas Boczkowski
Mathematics , 2012,
Abstract: Extremes of information combining inequalities play an important role in the analysis of sparse-graph codes under message-passing decoding. We introduce new tools for the derivation of such inequalities, and show by means of a concrete examples how they can be applied to solve some optimization problems in the analysis of low-density parity-check codes.
New Nanocrystalline Matrix Materials for Sintered Diamond Tools  [PDF]
Janusz Konstanty, Andrzej Romanski
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.311113
Abstract: The work presents the possibility of substitution of expensive, wear resistant Co-WC powders, that have been traditionally used in the production of sintered diamond tools, with cheap iron-base counterparts manufactured by ball milling. It has been shown that ball-milled Fe-Ni-Cu-Sn-C powders can be consolidated to a virtually pore-free condition by hot pressing at 900 ℃. The as-consolidated material has nanocrystalline structure and is characterised by a combination of high hardness, mechanical strength and excellent resistance to abrasion. Its properties can be widely modified by changing the milling conditions.
Nuclear Power for Poland  [PDF]
Andrzej G. Chmielewski
World Journal of Nuclear Science and Technology (WJNST) , 2013, DOI: 10.4236/wjnst.2013.34021

The present situation in Poland and Europe, regarding electric power generation by source, is discussed in the paper. The results of the implementation of EU competitive-low-carbon economy policy in some most developed countries in the continent, have given already good experimental data for evaluation of this strategy. Analysis of the reports provided by official sources for Germany, Denmark and Finland is a base for EU energy policy evaluation. The combustion technologies will be a main energy sources for many years from now. Therefore effects of fossil fuels and biomass combustion on the environment are presented briefly. Finally, the developments regarding Polish Nuclear Energy Programme are overviewed.

Mathematical Model and Computational Analysis of Selected Transient States of Cylindrical Linear Induction Motor Fed via Frequency Converter
Andrzej Rusek,Andrzej Popenda
Advances in Electrical and Electronic Engineering , 2008,
Abstract: The mathematical model of cylindrical linear induction motor (C-LIM) fed via frequency converter is presented in the paper. The model was developed in order to analyze numerically the transient states. Problems concerning dynamics of ac-machines especially linear induction motor are presented in [1 – 7]. Development of C-LIM mathematical model is based on circuit method and analogy to rotary induction motor. The analogy between both: (a) stator and rotor windings of rotary induction motor and (b) winding of primary part of C-LIM (inductor) and closed current circuits in external secondary part of C-LIM (race) is taken into consideration. The equations of C-LIM mathematical model are presented as matrix together with equations expressing each vector separately. A computational analysis of selected transient states of C-LIM fed via frequency converter is presented in the paper. Two typical examples of C-LIM operation are considered for the analysis: (a) starting the motor at various static loads and various synchronous velocities and (b) reverse of the motor at the same operation conditions. Results of simulation are presented as transient responses including transient electromagnetic force, transient linear velocity and transient phase current.
Network structure of phonographic market with characteristic similarities between musicians
Andrzej Buda,Andrzej Jarynowski
Physics , 2012,
Abstract: We investigate relations between best selling artists in last decade on phonographic market and from perspective of listeners by using the Social Network Analyzes. Starting network is obtained from the matrix of correlations between the world's best selling artists by considering the synchronous time evolution of weekly record sales. This method reveals the structure of phonographic market, but we claim that it has no impact on people who see relationship between artists and music genres. We compare 'sale' (based on correlation of record sales) or 'popularity' (based on data mining of the record charts) networks with 'similarity' (obtained mainly from survey within music experts opinion) and find no significant relations. We postulate that non-laminar phenomena on this specific market introduce turbulence to how people view relations of artists.
Exploring patterns in European singles charts
Andrzej Buda,Andrzej Jarynowski
Computer Science , 2015,
Abstract: European singles charts are important part of the music industry responsible for creating popularity of songs. After modeling and exploring dynamics of global album sales in previous papers, we investigate patterns of hit singles popularity according to all data (1966-2015) from weekly charts (polls) in 12 Western European countries. The dynamics of building popularity in various national charts is more than the economy because it depends on spread of information. In our research we have shown how countries may be affected by their neighbourhood and influenced by technological era. We have also computed correlations with geographical and cultural distances between countries in analog, digital and Internet era. We have shown that time delay between the single premiere and the peak of popularity has become shorter under the influence of technology and the popularity of songs depends on geographical distances in analog (1966-1987) and Internet (2004-2015) era. On the other hand, cultural distances between nations have influenced the peaks of popularity, but in the Compact Disc era only (1988-2003). We have also indicated the European countries in line with global trends e.g. The Netherlands, the United Kingdom and outsiders like Italy and Spain.
Hierarchical representation of socio-economic complex systems according to minimal sapnning trees
Andrzej Jarynowski,Andrzej Buda
Quantitative Finance , 2014,
Abstract: We investigate hierarchical structure in various complex systems according to Minimum Spanning Tree methods. Firstly, we investigate stock markets where the graphis obtained from the matrix of correlations coefficient computed between all pairs of assets by considering the synchronous time evolution of the difference of the logarithm of daily stock price. The hierarchical tree provides information useful to investigate the number and nature of economic factors that have associated a meaningful economic taxonomy. We continue to use this method in social systems (sport, political parties and pharmacy) to investigate collective effects and detect how single element of the system influences on the other ones. The level of correlations and Minimum Spanning Trees in various complex systems is also discussed.
含能材料 , 2002,
On Open-Open Games of Uncountable Length
Andrzej Kucharski
International Journal of Mathematics and Mathematical Sciences , 2012, DOI: 10.1155/2012/208693
Abstract: The aim of this paper is to investigate the open-open game of uncountable length. We introduce a cardinal number (), which says how long the Player I has to play to ensure a victory. It is proved that ()≤()≤()
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