Contents:

  • Paweł Wroniszewski Two-dimensional Model of Fluid Flow and Distribution of Nutrient Concentration in a Microfluidic Device   abstract | full text
  • Luis Alberto Casillas Trujillo Simulation of Xe Redistribution in UO{2}   abstract | full text
  • Oleksandr Sokolov, Olga Molchanova and Wiesław Urbaniak Methods for Refining Assessment of Test-Takers Based on Item Response Theory Model   abstract | full text
  • Sergei P. Kruchinin, Victor Ya. Antonchenko and Arkadiy A. Zolotovsky The Electronic Properties of New Fe-Based Superconductors   abstract | full text
  • Pawel Moskvin, Grazyna Olchowik, Jan M. Olchowik, Agata Zdyb, Slawomir Gulkowski and Wojciech Sadowski New Approach to the Determination of Phase Equilibrium in the Zn-Te System   abstract | full text
  • Krzysztof Goczyła Data Warehouses — Models, Techniques and Applications   abstract | full text
  • Juliusz L. Kulikowski Knowledge Mining from Data: Methodological Problems and Directions for Development   abstract | full text
  • Mscisław Nakonieczny, Antoni Nowakowski and Jacek Wyrwiński Development of Services and Infrastructure for Data Acquisition and Information Exchange   abstract | full text

Abstracts:

hPaweł Wroniszewski Two-dimensional Model of Fluid Flow and Distribution of Nutrient Concentration in a Microfluidic Device

During the past few years, the process of miniaturisation in the field of biochemical laboratory equipment led to the introduction of the so-called “lab-on-a-chip” microdevices, which combine separate functional units into a complex, multifunctional apparatus. Fluid dynamics plays an essential role in the development of such equipment, since frequently the major part of chemical analysis is based on soluble analytes. In this work, we consider a device for the analysis of cell growth under different conditions. In this device, dozens of cell spots absorb the nutrient (analyte) from the liquid medium. The concentration of the analyte must be strictly controlled to maintain a specific microenvironment. A two-dimensional model for the flow field and the distribution of concentration of the analyte is developed taking into account the geometrical shape of the spot with a simplified absorption model. The dependence of the results on the controlling parameters is investigated in order to determine the influence of the presence of the cell spot on the distribution of the analyte.

 

hLuis Alberto Casillas Trujillo Simulation of Xe Redistribution in UO{2}

The transport of fission gases in UO2 based nuclear fuels has a significant effect on the fuel performance. They can induce swelling of the fuel by the nucleation of gas bubbles within the fuel, and increase the mechanical interaction between the UO2 pellet and the cladding; also these bubbles can escape through the grain boundaries and contribute to the gaseous atmosphere in the fuel pin. We propose a model for the redistribution of xenon in the presence of different sinks, including nucleation and growth of gas bubbles. The finite element method has been implemented for the numerical solution of the model.

 

hOleksandr Sokolov, Olga Molchanova and Wiesław Urbaniak Methods for Refining Assessment of Test-Takers Based on Item Response Theory Model

This research is devoted to assessment methods used in different test systems, including e-learning systems. The methods considered here are based on classical test theory and item response theory (IRT). We propose a new approach for improving the quality of assessment by diversifying evaluation points.

 

hSergei P. Kruchinin, Victor Ya. Antonchenko and Arkadiy A. Zolotovsky The Electronic Properties of New Fe-Based Superconductors

We investigate the band structure of Fe-based superconductors using the firstprinciple method of density-functional theory. We calculated the band structure and the density of states at the Fermi level for ReFeAsO (Re = Sm, Dy, Ho, Er) superconductors. Our calculations indicate that the maximum critical superconducting transition temperature Tc will be observed for compounds with Sm and Er. We predict that Tc = 60K for ErFeAsO.

 

hPawel Moskvin, Grazyna Olchowik, Jan M. Olchowik, Agata Zdyb, Slawomir Gulkowski and Wojciech Sadowski New Approach to the Determination of Phase Equilibrium in the Zn-Te System

The polyassociative model of the liquid phase was applied to describe the phase equilibrium in the Zn-Te system. The thermodynamic functions describing the formation of liquid associates were obtained, taking into account the experimental data on the p-T -x equilibrium in the system. The model of polyassociative solutions with the parameters obtained in this work satisfactorily describes the p-T -x diagram of the system. The numerical results of the analysis of the phase equilibrium confirmed the possibility of applying the polyassociative model to the Zn-Te system in a wide temperature range.

 

hKrzysztof Goczyła Data Warehouses — Models, Techniques and Applications

This paper discusses the basic concepts of modern data warehouses. It presents the multidimensional data model (logical model) and the physical model of a data warehouse, as well as selected design and implementation issues. The focus is on the practical aspects of the application of data warehousing in business enterprises and organizations.

 

hJuliusz L. Kulikowski Knowledge Mining from Data: Methodological Problems and Directions for Development

The development of knowledge engineering and, within its framework, of data mining or knowledge mining from data should result in the characteristics or descriptions of objects, events, processes andór rules governing them, which should satisfy certain quality criteria: credibility, accuracy, verifiability, topicality, mutual logical consistency, usefulness, etc. Choosing suitable mathematical models of knowledge mining from data ensures satisfying only some of the above criteria. This paper presents, also in the context of the aims of The Committee on Data for Science and Technology (CODATA), more general aspects of knowledge mining and popularization, which require applying the rules that enable or facilitate controlling the quality of data.

 

hMscisław Nakonieczny, Antoni Nowakowski and Jacek Wyrwiński Development of Services and Infrastructure for Data Acquisition and Information Exchange

Focusing on the local solutions used by the institutions organizing the INFOBAZY (Infobases) conference, we briefly examine the development of IT infrastructure for science in Poland, including resources, networks and a high performance supercomputer centre. This development is presented from the perspective of the last twenty years – although the first INFOBAZY conference was organized in 1997, the IT infrastructure has been developed since 1991, when the first modern network server was installed in Warsaw. This presentation demonstrates both the enormous progress in the field and the state of the art today.

 

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