1,659 research outputs found

    Kuwait’s Strategic Response to its Developmental Challenges: Recasting its Strategic Options and Implementation Strategy from a Korean Perspective

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    Chapter 01. Introduction: Confronting Kuwait’s Present Reality Chapter 02. Critical Factors and SWOT Analysis for Crafting Strategic Response Chapter 03. Managing Stakeholders and Crafting the Implementation Strategy Chapter 04. Labor Market Reform Chapter 05. Updating Education and Human Resources Chapter 06. Fiscal Reform in Kuwait Chapter 07. Other Focal Areas Of Policy Initiatives For The Upcoming Five-Year Development Pla

    Enhancing photoluminescence quantum efficiency of metal halide perovskites by examining luminescence-limiting factors

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    Metal halide perovskites (MHPs) show superior optoelectronic properties, which give them the great potential for use in next generation light-emitting diodes (LEDs). In particular, their narrow emission linewidths can achieve ultrahigh color purity. However, the reported luminescence efficiency (LE) values are not high enough to be commercialized in displays and solid-state lightings. Moreover, the operational stability of LEDs associated with the overshooting of luminance and the high relative standard deviation of reported external quantum efficiencies are still problematic. In this perspective, we review photophysical factors that limit the photoluminescence quantum efficiency of perovskite-based LEDs. These factors are categorized into (i) weak exciton binding, (ii) nonradiative recombinations, (iii) slow cooling of long-lived hot carriers, (iv) deep-level defects, and (v) interband transition rates. We then present various physicochemical methods to effectively overcome these luminescence-limiting factors. We finally suggest some useful research directions to further improve the LE of MHP emitters as core components in displays and solid-state lightings.

    Negative pressure wound therapy for soft tissue injuries around the foot and ankle

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    <p>Abstract</p> <p>Background</p> <p>This study was performed to evaluate the results of negative pressure wound therapy (NPWT) in patients with open wounds in the foot and ankle region.</p> <p>Materials and methods</p> <p>Using a NPWT device, 16 patients were prospectively treated for soft tissue injuries around the foot and ankle. Mean patient age was 32.8 years (range, 3–67 years). All patients had suffered an acute trauma, due to a traffic accident, a fall, or a crush injury, and all had wounds with underlying tendon or bone exposure. Necrotic tissues were debrided before applying NPWT. Dressings were changed every 3 or 4 days and treatment was continued for 18.4 days on average (range, 11–29 days).</p> <p>Results</p> <p>Exposed tendons and bone were successfully covered with healthy granulation tissue in all cases except one. The sizes of soft tissue defects reduced from 56.4 cm<sup>2 </sup>to 42.9 cm<sup>2 </sup>after NPWT (mean decrease of 24%). In 15 of the 16 cases, coverage with granulation tissue was achieved and followed by a skin graft. A free flap was needed to cover exposed bone and tendon in one case. No major complication occurred that was directly attributable to treatment. In terms of minor complications, two patients suffered scar contracture of grafted skin.</p> <p>Conclusion</p> <p>NPWT was found to facilitate the rapid formation of healthy granulation tissue on open wounds in the foot and ankle region, and thus, to shorten healing time and minimize secondary soft tissue defect coverage procedures.</p
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