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Search Results: 1 - 10 of 208614 matches for " L. Marciniak "
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Measurement of large-size casting geometry of the CMM
B. Gapiński,M. Grzelka,L. Marciniak,?. M?dry
Archives of Foundry Engineering , 2011,
Abstract: The aim of this paper is to present the geometric dimensions’ control of large castings and moulds on coordinate measuring machines(CMMs). Precise measurements of large components are connected with many problems that arise from the vast mass and dimensions ofthe element. The bodies with a mass of several or even tens of tons require that the same metrological regime is restricted which isdedicated for small components measurement. That force the use of suitable measuring device, measurement conditions and the adequatepreparation of the element. Quality requirements expressed as tolerances in absolute terms do not cause difficulties in measurement. With regard to the significant size of the workpiece, it is not as easy to measure dimensions as with control of small elements. The paper presents the Coordinate Measuring Machines used to control large-size items.
Accuracy of the photogrametric measuring system for large size elements
M. Grzelka,G. Budzik,L. Marciniak,B. Gapiński
Archives of Foundry Engineering , 2011,
Abstract: The aim of this paper is to present methods of estimating and guidelines for verifying the accuracy of optical photogrammetric measuringsystems, using for measurement of large size elements. Measuring systems applied to measure workpieces of a large size which oftenreach more than 10000mm require use of appropriate standards. Those standards provided by the manufacturer of photogrammetricsystems are certified and are inspected annually. To make sure that these systems work properly there was developed a special standardVDI / VDE 2634, "Optical 3D measuring systems. Imaging systems with point - by - point probing. " According to recommendationsdescribed in this standard research on accuracy of photogrametric measuring system was conducted using K class gauge blocks dedicatedto calibrate and test accuracy of classic CMMs. The paper presents results of research of estimation the actual error of indication for sizemeasurement MPEE for photogrammetric coordinate measuring system TRITOP.
The Hildebrand Solubility Parameters of Ionic Liquids—Part 2
Andrzej Marciniak
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12063553
Abstract: The Hildebrand solubility parameters have been calculated for eight ionic liquids. Retention data from the inverse gas chromatography measurements of the activity coefficients at infinite dilution were used for the calculation. From the solubility parameters, the enthalpies of vaporization of ionic liquids were estimated. Results are compared with solubility parameters estimated by different methods.
The Solubility Parameters of Ionic Liquids
Andrzej Marciniak
International Journal of Molecular Sciences , 2010, DOI: 10.3390/ijms11051973
Abstract: The Hildebrand’s solubility parameters have been calculated for 18 ionic liquids from the inverse gas chromatography measurements of the activity coefficients at infinite dilution. Retention data were used for the calculation. The solubility parameters are helpful for the prediction of the solubility in the binary solvent mixtures. From the solubility parameters, the standard enthalpies of vaporization of ionic liquids were estimated.
Greenwashing as an Example of Ecological Marketing Misleading Practices
Adam Marciniak
Comparative Economic Research , 2009, DOI: 10.2478/v10103-009-0003-x
Abstract: Nowadays, world-wide recognized corporations seek methods and instruments which enable them an effective flow of information concerning their actions as far as environment and sustainable development issues are concerned. It seems that marketing tools work well within this field. That is how ecological marketing (EM) originated with its advantages and drawbacks including greenwashing. The paper is committed to the analysis of this phenomenon, used to describe the unjustified appropriation of environmental virtue by a company to create a pro-environmental image. The article also presents common mechanisms of EM, shows how greenwashing works in practice and shares research results concerning purchasing habits (focusing on environmental issues) in China, USA and Great Britain
Methods of organization of SCORM-compliant teaching materials in electronic format
Jacek Marciniak
EduAction : Electronic Education Magazine , 2012,
Abstract: This paper presents a method of organizing electronic teaching materials based on their role in the teaching process rather than their technical structure. Our method allows SCORM materials stored as e-learning courses ( electronic books”) to be subdivided and structured so that content can be used in multiple contexts. As a standard, SCORM defines rules for organizing content, but not how to divide and structure it. Our method uses UCTS nomenclature to divide content, define relationships between content entities, and aggregate those entities into courses. This allows content to be shared in different implementations of SCORM while guaranteeing that usability and consistency are maintained.
Building didactic content repositories: method and tools
Jacek Marciniak
EduAction : Electronic Education Magazine , 2012,
Abstract: The article presents the method and tools which allows to build repositories of didactic materials in SCORM using UCTS taxonomic system and Content Repository software. SCORM is a universal specification designed to create reusable materials in digital format. UCTS is a taxonomic model which allows to attribute didactic interpretations to content components. Content Repository is a web software designed to create, store and process didactic content in SCORM. The method was verified while creating E-archeology Content Repository which stores e-learning materials on protection and management of archeological heritage. The repository contains approximately 4500 Learning Objects in 5 languages and about 800 components of didactically useful e-learning components described in UCTS.
DNA endoreplication level in endosperm and in cotyledons during seed development in three dicotyledonous species
Kazimierz Marciniak
Acta Societatis Botanicorum Poloniae , 1991, DOI: 10.5586/asbp.1991.020
Abstract: The DNA content of nuclear and cellular endosperm and in cotyledons in the course of seed development in Helianthus annuus, Pisum sativum and Vicia faba was cytophotometrically measured after Faulgen's reaction. Helianthus annuus is characterized by the lowest endoreplication dynamics attaining a maximum DNA content of 48C in nuclear endosperm, which corresponds to four endoreplication rounds, and 16C DNA (three rounds) in cotyledons. In Pisum sativum cellular endosperm in the studied stages of seed development was absent and the highest DNA content in cotyledons was 512C DNA; this corresponds to eight endoreplication rounds. In Vicia faba, the maximum DNA endoreplication level was 1536C in nuclear endosperm, which corresponds to nine endoreplication rounds; in cotyledons the maximum DNA content was 64C (five rounds). In the course of seed development, differences in the dynamics of DNA endoreplication in throphic tissues of the examined species seem to be similar to differences in the endoreplication level in root and leaf parenchyma, but the DNA endoreplication level is much higher in throphic tissues. Therefore, the endoreplication pattern might be species-specific and genetically conditioned.
DNA endoreplication level in endosperm during seed development in three monocotyledonous species
Kazimierz Marciniak
Acta Societatis Botanicorum Poloniae , 1993, DOI: 10.5586/asbp.1993.021
Abstract: The DNA content after the Feulgen reaction in the endosperm of three monocotyledonous plant species (Asparagus officinalis, Muscari comosom, Haemanthus kurharinae) differing in their 2C DNA content, was cytophotometrically measured. During endosperm development 1-6 endoreplication cycles take place, depending on the species. Differences in nuclear DNA endoreplication dynamics in the tested species are similar to those occurring in root parenchyma, but the endoreplication level in the endosperm is higher.
Modification of surface films on chromium-nickel-molybdenum steel implants used in orthopaedics and traumatology
J. Marciniak
Journal of Achievements in Materials and Manufacturing Engineering , 2010,
Abstract: Purpose: the paper is to characterize stainless steel of modyfied sufrace as a material used in orthopaedics andtraumatology on the example of LCP (Locking Compression Plate) used in long bones treatment.Design/methodology/approach: In order to reach the goal biomechanical analyses, both numerical andexperimental, were carried out. The results of the analyses are the basis for selecting geometrical features ofa plate stabiliser and biomaterial mechanical properties. The degree of stress and deformation also determinesareas where corrosion can start to develop. Chromium-nickel-molybdenum steel widely applied for makingimplants used in orthopaedics and traumatology was selected for testing implant surface modification. Passiveand passive-carbon films were formed on the implants. The structure of the created films was tested togetherwith their susceptibility to deformation and resistance to corrosion.Findings: It was shown that formation of passive-carbon DLC coatings is an effective method of increasingsteel resistance to pitting, crevice and stress corrosion and of increasing its biocompatibility.Practical implications: The proposed surface treatment seems to be effective method that allow to reduce therisk of post-surgical complications. The coatings can be formed by using electrolytic polishing and passivationand a final RF PACVD process.Originality/value: The author also presents results of the coating surface topography examination, results oftests on its chemical and phase structure as well as mechanical and physicochemical properties.
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