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Search Results: 1 - 10 of 1405 matches for " Marian Cholewa "
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Heat flow description during crystallization process of cast dispersive composites
Cholewa M.
Archives of Foundry Engineering , 2007,
Abstract: The aim of this work was to show possibilities of numerical simulation software, based on heat transfer model, commonly used in foundry industry in cast composite properties engineering. The main restriction in most of used software systems is lack of heat transfer, which may occur at composite creation. In this work the reinforcing particle morphology an size were expressed by one quantity – morphological modulus Mm and were examined for influence on heat transfer and conductivity up to the Newton’s and Fourier’s laws. The main restrictions for using Fourier’s model based software for composite engineering are shown. The way for crystallization control was presented including influence of morphology, transition zone and thermo-physical properties of components. Proposed methodology can be used for cast composite properties engineering in cases, where relative motion of components is negligible. In other cases heat transfer coefficient is justified only if the software used is based on Fourier’s model and the source code is accessible. Proposed assumptions create possibility for components selection verification in terms of technological and operating properties of cast composite. An example of such approach was shown in work [1, 23].
Structure evaluation of cast dispersive AlSi-CrxCy composites
M. Cholewa
Archives of Foundry Engineering , 2008,
Abstract: In this work author showed the diversification of structure for cast dispersive AlSi-CrxCy composites. Wide possibilities of properties control and optimization were described, through microstructure of the matrix and the transition zone shaping. Utility castings were prepared with use of traditional casting techniques, ceramic and metal moulds. The influence of technological conditions and cooling rate ion the composite structure was studied. The main factor of structural changes was the diffusion at matrix – reinforcement interface. Divers structure was observed in particle close neighborhood. Possibilities of diffusion control were indicated through application of factors assisting the crystallization.
Model of heat flow during crystallisation of cast composites
M. Cholewa
Journal of Achievements in Materials and Manufacturing Engineering , 2007,
Abstract: Purpose: The aim of this work was to show possibilities of numerical simulation software, based on heat transfer model, commonly used in foundry industry in cast composite properties engineering.Design/methodology/approach: The main restriction in most of used software systems is lack of heat transfer, which may occur at composite creation. In this work the reinforcing particle morphology an size were expressed by one quantity – morphological modulus Mm and were examined for influence on heat transfer and conductivity up to the Newton’s and Fourier’s laws.Findings: The main restrictions for using Fourier’s model based software for composite engineering are shown. The way for crystallization control was presented including influence of morphology, transition zone and thermo-physical properties of components.Research limitations/implications: Proposed methodology can be used for cast composite properties engineering in cases, where relative motion of components is negligible. In other cases heat transfer coefficient is justified only if the software used is based on Fourier’s model and the source code is accessible.Originality/value: Proposed assumptions create possibility for components selection verification in terms of technological and operating properties of cast composite. An example of such approach was shown in work [1, 23].
Thermal verification procedure for dispersive composite solidification process
M. Cholewa
Journal of Achievements in Materials and Manufacturing Engineering , 2006,
Abstract: Purpose: The aim of this work was optimization of composite matrix solidifcation process with use of thermal properties of components and geometrical characteristics of transition zone related with reinforcing particles morphology.Design/methodology/approach: The method was based on quantitive image analysis. The reinforcing particles morphology was described by morphological modulus. With use of numerical simulation the changes in temperature and its derivatives after time and direction in studied composite micro – region appeared.Findings: As a result of this studies the forecast procedure for composite structure evaluation was obtained and for which optional solidification theory can be used. Analysis of particles morphology influence on matrix solidification process is a proposed novelty.Research limitations/implications: The work enables in enginereeng practice verification of components from technological point of view by thermal and geometrical properties selection and thus by introducing changes to the particle – matrix (casting) – mould – surrounding system. In this stage the procedure does not include the diffusion between matrix and reinforcement related to its relative motion. Evaluation of incomplete wetting and transition zone phases occurance does not permit tribological or fatique properties forecasting.Originality/value: The proposed procedure is useful for composite properties forecasting based on components thermal and geometrical characteristics.
New approach to cast dispersive composite engineering
M. Cholewa
Journal of Achievements in Materials and Manufacturing Engineering , 2006,
Abstract: Purpose: The aim of this work was to show possibilities of numerical simulation software, based on heattransfer model, commonly used in foundry industry in cast composite properties engineering.Design/methodology/approach: The main restriction in most of used software systems is lack of heattransfer, which may occur at composite creation. In this work the reinforcing particle morphology an size wereexpressed by one quantity – morphological modulus Mm and were examined for influence on heat transfer andconductivity up to the Newton’s and Fourier’s laws.Findings: The main restrictions for using Fourier’s model based software for composite engineering are shown.The way for crystallization control was presented including influence of morphology, transition zone andthermophysical properties of components.Research limitations/implications: Proposed methodology can be used for cast composite propertiesengineering in cases, where relative motion of components is negligible. In other cases heat transfer coefficientis justified only if the software used is based on Fourier’s model and the source code is accessible.Originality/value: Proposed assumptions create possibility for components selection verification in terms oftechnological and operating properties of cast composite. An example of such approach was shown in work [1].
Evaluating a Student MIS in the Tertiary Education Sector: Addressing Functional-Operational Misalignment through Continuous Participative Evaluation  [PDF]
Marian Carcary
Journal of Service Science and Management (JSSM) , 2010, DOI: 10.4236/jssm.2010.31004
Abstract: The Information and Communications Technology (ICT) evaluation literature spans several decades. ICT evaluation approaches range from objective and positivistic to subjective and interpretive. While positivistic approaches have dominated the past, there is increasing recognition of the value of interpretivist methods and the need for ongoing project evaluation. Formative continuous participative evaluation (CPE) offers several benefits in terms of project control, enhanced stakeholder relationships and benefit realisation; nonetheless this is often ignored in practice. There is a paucity of ICT evaluation within the Higher Education sector. The 14 Irish Institutes of Technology (IoTs) recently underwent an extensive transformation of their ICT systems, through a nationwide implementation of a suite of integrated IS. This research study, centred on the evaluation of the Student MIS implementation was interpretive in nature; case studies were conducted in five IoTs. This paper focuses specifically on one issue uncovered through the research i.e. the misalignment between the Student MIS and the IoTs requirements. The paper proposes a set of guidelines for addressing this issue through focusing on the theoretical underpinnings of CPE and its importance for organisational learning and benefit realisation.
Cancer Status: Mocb and tPSA Prostate Cancer Markers  [PDF]
Marian Surma
Journal of Cancer Therapy (JCT) , 2012, DOI: 10.4236/jct.2012.36144
Abstract: On the basis of the results of magneto-optical studies and their comparison with the outcome of medical tests magneto-optical MOCB and tPSA serum markers of cancer/recovered patient are presented. Status of the cancer serum donor is recognized as presence of the laevorotatory optical active molecules of (-)p density in serum while status of the recovered donor is recognized as quantitative domination of the dextrorotatory (+)p molecules in serum. These molecular information carriers (-)p and (+)p are recorded by the magneto-optical circular birefringence MOCB effect in B2 magnetic field. The laevo/dextrorotatory carriers are enantiomers in the case of (-)p = (+)p relations fulfilled for any individual cancer and the same recovered patient. The positive predictive value PPV of MOCB results is 100%.
Enantiomers Present in Serum Carry Cancer and/or Recovery Status Information  [PDF]
Marian Surma
Journal of Cancer Therapy (JCT) , 2014, DOI: 10.4236/jct.2014.56071
Abstract:

Human blood serum of cancer, cancer-recovered and healthy patients contains laevorotatory and dextrorotatory B2 active molecules. The laevorotatory B2 active carriers in patient serum carry information on the cancer status while the dextrorotatory B2 active carriers carry information on the recovered and/or healthy patient status. Their magneto-optical characteristic is analysed by the B2 Magneto Optical Circular Birefringence. By applying the MOCB experimental technique, it is possible to differentiate between the cancer and non-cancer patients. The paper introduces a purely molecular physics approach for description of the cancer/recovered and also non-cancer patients status.

“To Understand Russia”? Question about Russia as a Philosophical Problem  [PDF]
Marian Broda
Open Journal of Philosophy (OJPP) , 2014, DOI: 10.4236/ojpp.2014.44063
Abstract: The aim of this article is to identify and explain the cognitive possibilities which—for the sake of analysis of the questions about Russia and the efforts to “understand Russia”, for centuries central to the Russian intellectual and cultural tradition—are offered by the post-Kantian philosophical perspective. The fundamental research method is the analysis of texts in which representative members of the Russian philosophical and broader intelectual-cultural tradition undertake selfcoqnitive attempts, asking questions about Russia. The analyses which I have undertaken, show that in the post-Kantian theoretical perspective it is possible to strive for recognition of the basic assumptions, structures, properties and conditions of the sense-making processes, which are invisible for such a subject, which is directly involved in a specific cognitive relation. It is then possible and required to determine which forms and structures can appear—and why—within those basic assumptions or conditions as important—from the perspective of subject, object or axiology—the recognition of factors, conditions and limits of heterogenization of the basic structural and substantial solutions, the recurring relations of senses and the types of their specifications, and the scope and methods of permitted self-problematization. In conclusion, I wish to state that the questions about Russia are, therefore, truly questions of their authors about themselves and their way of understanding the world.
Molecular Marker of Tumours  [PDF]
Marian Surma
Journal of Cancer Therapy (JCT) , 2016, DOI: 10.4236/jct.2016.710070
Abstract: Molecular structure of the marker of tumour is determined by magneto-optical analysis of blood serum. The marker is the laevorotatory enantiomer of alanine. The cancer status of a subject is described by the number of molecules of the laevorotatory alanine enantiomer (-)ρ and the effectiveness of therapy is measured by the number of molecules of the dextrorotatory alanine enantiomer (+)ρ. The values of (-)ρ and (+)ρ are determined separately for the patient before and after therapy.
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