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Development of a database for the prediction of phases in Pt-based Superalloys:Cr-Pt-Ru

Rare Metals 2006年第5期25卷 597-607页

作者： A.Watson L.A.Cornish R.Süss Institute for Materials Research School of ProcessMaterials and Environmental EngineeringUniversity of LeedsLeedsUK Advanced Materials Division MintekPrivate Bag X3015Randburg2125South AfricaDST/NRF Centre of Excellence for Strong MaterialsUniversity of the WitwatersrandJohannesburg2025South Africa Advanced Materials Division MintekPrivate Bag X3015Randburg2125South AfricaDST/NRF Centre of Excellence for Strong MaterialsUniversity of the WitwatersrandJohannesburg2025South Africa School of Chemical and Metallurgical EngineeringUniversity of the WitwatersrandJohannesburg2025South Africa

Work has been ongoing in building a thermodynamic database for the prediction of phase equilibria in Pt-based superalloys. The alloys are being developed for high texture applications in aggr.ssive environments. The database will aid the design of alloys by enabling the calculation of the composition and proportions of phases present in alloys of different compositions. In order to extend this database, a preliminary assessment of the Cr-Pt-Ru system has been undertaken, using a combination of Pandat and MTDATA software. As a first step, it was necessary to provide thermodynamic models for the three associated binary systems. Owing to a lack of thermodynamic information for these systems, the binary assessments were based on phase diagrams available in the literature. Using recent experimental phase equilibria data for the ternary system, a preliminary assessment of the Cr-Pt-Ru system has been produced. In this preliminary assessment, simplified models were employed for the L12 and sigma phases with a view to extending the descriptions as new experimental information becomes available.

关键词： Cr-Pt-Rh thermodynamics assessment phase diagram

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A Longitudinal Study of Patient Reported Positioning-Related Discomfort and Pain after Laparoscopic Surgery in the Lithotomy Position

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Open Journal of Nursing 2022年第10期12卷 650-664页

作者： Ann-Chatrin Linqvist Leonardsen Egil Bekkhus Kristin E. Næss Tvete Kristin E. Næss Tvete Trine Hovland Dennis Haglund Astrid Wevling Department of Health and Welfare &#216 stfold University College Halden Norway Ø stfold Hospital Trust Gr&#229 lum Norway Department of Surgery &#216 stfold Hospital Trust Gr&#229 lum Norway

Background: Our hypothesis was that only established and persistent injuries and complications after positioning in the Trendelenburg position are reported and detected, despite that patients may have great discomfort after surgery. Aim: The aim of this study was to explore patient reported discomfort, pain and functional decrease two hours, 24 hours and four weeks after laparoscopic resection of the colon in the prone lithotomy position, as well as factors potentially associated with reported pain. Methods: A longitudinal self-report questionnaire study was conducted at three time-points. Results: A total of 37 patients responded. Findings show that patients mostly reported pain in relation to the surgical area, but also related to other areas that may be linked to positioning. Conclusion: Even though patients reported mild pain, several of the patients still reported this, four weeks postoperatively, as well as some functional decrease. Our findings support the need to focus on preventing positioning injuries.

关键词： Positioning Injuries Operating Room Nursing Pain Discomfort Functional Decrease

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