56 research outputs found

    Large format AlInAs-InGaAs quantum-well infrared photodetector focal plane array for midwavelength infrared thermal imaging

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    We report the first large format (640 x 512) AlInAs-InGaAs quantum-well infrared photodetector (QWIP) focal plane array (FPA), and investigate the characteristics of AlInAs-InGaAs QWIPs both at pixel and FPA level. The measurements on the detectors fabricated with molecular beam epitaxy grown epilayer structure including 30 InGaAs quantum wells (26 A thick, N-D = 2 x 10(18) cm(-3)) yielded very promising characteristics. The detectors with lambda(p) = 4.2 mu m and Delta lambda/lambda(p) = 25% displayed a background-limited performance temperature as high as 105 K with f/2 aperture. The noise equivalent temperature difference of the FPA is as low as 23 mK (f/1.5) at 105-K sensor temperature with 99.6% operability. These results are comparable to the best results reported for AlGaAs-InGaAs midwavelength infrared QWIPs showing the promise of this material system for completely lattice-matched multiband QWIP FPAs

    Use of donation after circulatory death donors in pediatric liver transplantation

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    After advancement of technical aspects, use of well-established and novel immunosuppressive therapies, and better pre and postoperative care, which resulted in high overall survival rates with liver transplantation, waiting list mortality has become the main issue for pediatric patients with end stage liver disease. Insufficient organ donors have become a challenging issue especially in the pediatric patient population, for whom size match of donor or graft is harder to achieve. In order to expand the donor pool and decrease the gap between the demand and supply of donor organs, use of donation after circulatory death (DCD) donors have been proportionally increased. In this chapter we aim to discuss current practices, issues and outcomes with DCD in pediatric liver transplantation, as well as future strategies for improvement of results. © 202
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