The Experts below are selected from a list of 192459 Experts worldwide ranked by ideXlab platform
Hryhoriy Nykyforchyn - One of the best experts on this subject based on the ideXlab platform.
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effective method for fatigue crack arrest in structural steels based on artificial creation of crack closure effect
International Journal of Fatigue, 2019Co-Authors: Ya. Khaburskyi, Z V Slobodyan, Myroslava Hredil, Hryhoriy NykyforchynAbstract:Abstract Novel method of fatigue crack growth arrest in structural steels based on artificial creation of crack closure effect is proposed. Special liquid Technological Environment is used which, falling into a crack cavity and interacting with crack surface metal, forms solid products there, which prevents crack surfaces contact during a period of unloading. This leads to crack arrest in a wide range of stress intensity factor ΔK. Crack growth retardation effect enhances with an increase of the active component concentration in a solution. Some Technological aspects for practical application of the proposed method are considered.
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Chemical method of fatigue and corrosion fatigue crack growth arrest in steels by metal treatment with the special Technological Environment
Procedia Structural Integrity, 2018Co-Authors: Ya. Khaburskyi, Hryhoriy NykyforchynAbstract:Abstract Novel method of fatigue crack growth arrest in structural steels based on artificial creation of crack closure effect is proposed. Special Technological Environment is used which, falling into a crack cavity, forms solid products there. These products practically totally fill up a crack cavity and serve as a wedge which prevents crack closure during a period of unloading and, respectively, cyclic deformation in a crack tip. Fatigue crack growth curves are built for low alloyed steel without and with crack treatment which demonstrate crack arrest in a wide range of stress intensity factor (SIF) ΔK, from the threshold level up to almost fatigue fracture toughness Kfc. i.e for the whole actual range of ΔK. The peculiarity of artificial crack closure is accentuated: a decrease of effective ΔK is accompanied by an increase of a middle level of SIF therefore a risk of stress corrosion cracking and corrosion fatigue rises. This factor is especially important for long-term operated steels which lost their initial brittle fracture resistance. The interaction of active components of the Technological Environment with a metal at the crack surface which provides formation of solid products in a crack cavity is analyzed. Some Technological aspects for practical application of the proposed method are considered.
Zbigniew Adamczyk - One of the best experts on this subject based on the ideXlab platform.
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cad cam Technological Environment creation as an interactive application on the web
Journal of Materials Processing Technology, 2001Co-Authors: Zbigniew Adamczyk, Krzysztof KociolekAbstract:Abstract Databases as interactive applications on the Web are a very up-to-date, promising and perspective solution. Internet global network supporting distributed manufacturing is a new philosophy of manufacturing in which distributed participants of machining process can communicate with each other interactively. Distributed manufacturing concept includes production planning and scheduling. CAD/CAM system as a part of production planning process has to be adapted to new condition of CAD/CAM exploitation which creates new challenge in CAD/CAM development.
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internet tools supporting creation and management of Technological Environment of cad cam systems
Journal of Materials Processing Technology, 1998Co-Authors: Zbigniew Adamczyk, H MalekAbstract:Abstract As a rule CAM systems usage requires a number of catalogues, especially in process planning. Machine tools, cutting tools, inserts and tooling catalogues are sources of data which are necessary in cutting process planning. However, the traditional form of these catalogues is not convenient any longer, when using a CAD/CAM system. Research and development works carried out in the Institute of Metal Cutting, Cracow, Poland, on a new generation of interactive part programming system KSP-OSN/WIN drew attention on the lack of Technological Environment, which was a significant limitation in efficient exploitation of the system. This fact became an inspiration in searching for new solutions of databases establishment by means of network-based concept. Catalogue data are divided into groups and presented in the form of HTML documents in logical sequence. These documents are reviewed by KSP-OSN user with any web browser. Technological data (tools, cutting inserts etc.) found while searching HTML documents, are available from MS Access database by KSP-OSN user.
Karen Hollebrands - One of the best experts on this subject based on the ideXlab platform.
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High school students’ understandings of geometric transformations in the context of a Technological Environment
The Journal of Mathematical Behavior, 2003Co-Authors: Karen HollebrandsAbstract:Abstract This study investigated the nature of students’ understandings of geometric transformations, which included translations, reflections, rotations, and dilations, in the context of the Technological tool, The Geometer’s Sketchpad . The researcher implemented a seven-week instructional unit on geometric transformations within an Honors Geometry class. Students’ conceptions of transformations as functions were analyzed using the APOS theory and were informed by an analysis of students’ interpretations and uses of representations of geometrical objects using the constructs of drawing and figure . The analysis suggests students’ understandings of key concepts including domain, variables and parameters, and relationships and properties of transformations were critical for supporting the development of deeper understandings of transformations as functions.
Åsa Engström - One of the best experts on this subject based on the ideXlab platform.
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Nursing care in a high-Technological Environment: Experiences of critical care nurses
Intensive & critical care nursing, 2014Co-Authors: Adam Tunlind, John Gjertz Granström, Åsa EngströmAbstract:Summary Objectives Management of technical equipment, such as ventilators, infusion pumps, monitors and dialysis, makes health care in an intensive care setting more complex. Technology can be defined as items, machinery and equipment that are connected to knowledge and management to maximise efficiency. Technology is not only the equipment itself, but also the knowledge of how to use it and the ability to convert it into nursing care. The aim of this study is to describe critical care nurses’ experience of performing nursing care in a high technology healthcare Environment. Research methodology Qualitative, personal interviews were conducted during 2012 with eight critical care nurses in the northern part of Sweden. Interview transcripts were analysed using qualitative content analysis. Findings Three themes with six categories emerged. The technology was described as a security that could facilitate nursing care, but also one that could sometimes present obstacles. The importance of using the clinical gaze was highlighted. Conclusion Nursing care in a high Technological Environment must be seen as multi-faceted when it comes to how it affects CCNs’ experience. The advanced care conducted in an ICU could not function without high-tech equipment, nor could care operate without skilled interpersonal interaction and maintenance of basal nursing. That technology is seen as a major tool and simultaneously as a barrier to patient-centred care.
Krzysztof Kociolek - One of the best experts on this subject based on the ideXlab platform.
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cad cam Technological Environment creation as an interactive application on the web
Journal of Materials Processing Technology, 2001Co-Authors: Zbigniew Adamczyk, Krzysztof KociolekAbstract:Abstract Databases as interactive applications on the Web are a very up-to-date, promising and perspective solution. Internet global network supporting distributed manufacturing is a new philosophy of manufacturing in which distributed participants of machining process can communicate with each other interactively. Distributed manufacturing concept includes production planning and scheduling. CAD/CAM system as a part of production planning process has to be adapted to new condition of CAD/CAM exploitation which creates new challenge in CAD/CAM development.
