Age replacement policy is concerned with finding an optional time tominimize the cost, at which time the unit is replaced even if itdoes not fail. So far, age replacement policy involving random agehas been proposed. This paper will assume the age of the unit is anuncertain variable, and find the optimal time to replace the unit.

Introduction:  In patients who underwent surgery to repair Tetralogy of Fallot, right ventricular dilation from pulmonary regurgitation may be result in right ventricular failure, arrhythmias and cardiac arrest. Hence, pulmonary valve replacement may be necessary to reduce right ventricular volume overload. The aim of present study was to assess the effects of pulmonary valve replacement on rig...

Transcatheter aortic valve replacement (TAVR) is a novel therapeutic intervention for the replacement of severely stenotic aortic valves in high-risk patients for standard surgical procedures. Since the initial PARTNER trial results, use of TAVR has been on the rise each year. New delivery methods and different valves have been developed and modified in order to promote the minimally invasive p...

although mohaghegh khorasani has raised the impossibility of replacement of certitude as to subject by authorized conjectural proof (amara) due to the impediment of conjunction in consideration; sheikh ansari, while rejecting the replacement of certitude as to attribute, has accepted the replacement of declaratory certitude. some islamic scholars believe in classification, according to the basi...

The aim of this review article is to analyze the clinical effectiveness of total knee replacement (TKR) compared to unicompartmental knee replacement (UKR) in patients with medial unicompartmental osteoarthritis (MUO) in terms of survival rates, revision rates and postoperative complications. The search engine was MedLine. The keywords used were: medial knee osteoarthritis. Three thousand and n...

in recent years, rye caused heavy damages in wheat farms in iran. in order to evaluate wheat competitiveness ability against rye, an experiment was conducted in replacement series design. field experiment was carried out at the agricultural and natural resources research station in miandoab during 2009-2010 (for 2 years). the experimental design was a randomized complete block design with 3 rep...

the aim of this review article is to analyze the clinical effectiveness of total knee replacement (tkr) compared to unicompartmental knee replacement (ukr) in patients with medial unicompartmental osteoarthritis (muo) in terms of survival rates, revision rates and postoperative complications. the search engine was medline. the keywords used were: medial knee osteoarthritis. three thousand and n...

Replacement and reattachment of a newly detached composite tooth pontic is sometimes justified because of shape, color, function and patient satisfaction. The aim of this case report is to describe a new method using Rigid Tray Technique for exact replacement and reattachment of acceptable detached composite tooth pontic