نتایج جستجو برای: up conversion
تعداد نتایج: 1026830 فیلتر نتایج به سال:
In this study, the up-conversion luminescence for aqueous suspensions of carbon dots with polyfunctional and carboxylated surfaces synthesized by a hydrothermal method was investigated. The obtained quadratic dependence intensity on power exciting radiation indicates that these is caused two-photon absorption. optimal wavelength determined studied samples. dependences signal pH value suspension...
applications such as high definition viedeo reproduction, portable computers, wireless, and multimedia demand, and ever-increasing need for ligh-frequency high-resolution and low-power analog-to-digital converters. flash, two-step flash, and pipeline convertors are fast but consume large amount of power and require large area. to overcome these problems, successive approximation converter blo...
Background and purpose: In-vivo dosimetry is used to ensure accurate delivery of dose to tumors during radiotherapy. This study aimed at measuring the entrance doses without the build-up cap for patients undergoing 15MV radiotherapy and determining the percentage errors between doses measured by films and those calculated with a treatment planning system (TPS). Materials and methods: The stu...
VO2+ and its complexes with ethylenediamine (en), acetylacetonate (acac), 2, 2’-bipyridine(bpy) ligands, immobilized within nanoreactors of Al-MCM-41 designated as VO2+/Al-MCM-41 or VOL2/Al-MCM-41, were prepared and characterized by X-ray powder diffraction (XRD), FT-IR, BET nitrogen adsorption-desorption and chemical analysis techniques. VO2+/Al-MCM-41 and VOL2/Al-MCM-41 were found to catalyze...
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