منابع مشابه
Could it happen again? the Björk-Shiley convexo-concave heart valve story.
Most readers of “Twenty-Five–Year Experience With the Björk-Shiley Convexoconcave Heart Valve: A Continuing Clinical Concern” in this issue of Circulation have not heard of the valve.1 Many elements of its story parallel those of cerivastatin2,3 and rofecoxib,4 but with a twist: Recalling a heart valve may entail greater risks than leaving a possible “time bomb” in place. The Björk-Shiley story...
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In previous publications I have suggested that opposite thermodynamic arrows of time could coexist in our universe. This letter responds to the comments of H. D. Zeh (previous letter in this journal). In 2002 a conference took place in Bielefeld, entitled, " The direction of time: The role of reversibil-ity/irreversibility in the study of nature " [1]. In my presentation I spoke about recent wo...
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Parents may come to well-child checkup appointments equipped with lists of questions about vaccine safety and effectiveness. In this context, pediatricians may struggle to explain the value of vaccines when confronted with a difficult situation: an actual untoward event after administration of childhood vaccines. Often referred to as an adverse event following immunization (AEFI), 6 these event...
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This case study involves two continuously cast steel crankshaft failures. Three parties performed their own failure analyses: (1) the engine manufacturer responsible for component design, specification, and application; (2) the steel supplier and forging supplier responsible for making the steel, forging the shape, and preliminary heat treatment; and (3) a supplier that provided induction harde...
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Real life experiences were used to put together this list of steps to be followed during the planning and implementation of a formal MRP II planning and control system. Project management and organizational skills are critical to the success of the project. The implementation plan is carried out by a project team and subcommittees with the support of top management. Cost/benefit analysis and pe...
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ژورنال
عنوان ژورنال: Circulation
سال: 2005
ISSN: 0009-7322,1524-4539
DOI: 10.1161/circulationaha.105.540518