نتایج جستجو برای: 3 muammad madjd al
تعداد نتایج: 2138163 فیلتر نتایج به سال:
Reactive co-sputtering has been applied as a low-cost method for deposition of Al2O3:Er layers. Channel waveguide fabrication has been optimized and results in waveguides with low background losses (0.21 dB/cm), demonstrating the feasibility of realizing active photonic devices. A net optical gain of 0.84 dB/cm for a 1533-nm signal has been obtained in a 700-nm-thick Er-doped Al2O3 waveguide pu...
هدف از انجام این پژوهش، بررسی رفتار سایشی نانوکامپوزیت al-sic در بارهای اعمالی و دماهای مختلف و مقایسه آن با آلومینیم تقویت نشده است. بدین منظور نمونه های کامپوزیتی با کسر حجمی های 0، 1، 3 و 5 درصد نانو sic به روش متالورژی پودر و به شکل دیسکی تهیه شدند. پس از بررسی ریزساختار نمونه ها و اندازه گیری چگالی و سختی، نمونه های تهیه شده تحت آزمون سایش پین روی دیسک قرار گرفتند. جهت بررسی اثر بار اعمالی...
clusters. This process is the first example of a photoinduced isomerization observed in an anion cluster gas-phase system. Potential energy surfaces for the ground state and the excited state ~S1 and T1! are explored by means of B3LYP, MP2, CI-singles, and CASSCF methods. We demonstrate that the isomerization process occurs between the global minimum singlet state Book structure (C2v , A1) and ...
K. Han,1,2 Z. Huang,1,2,* S. W. Zeng,1,2 M. Yang,3 C. J. Li,4 W. X. Zhou,1,2 X. Renshaw Wang,5 T. Venkatesan,1,2,4,6,7 J. M. D. Coey,1,8 M. Goiran,3 W. Escoffier,3 and Ariando1,2,6,† 1NUSNNI-NanoCore, National University of Singapore, Singapore 117411, Singapore 2Department of Physics, National University of Singapore, Singapore 117542, Singapore 3Laboratoire National des Champs Magnétiques Int...
10 Nanocrystalline Mg87Ni3Al3Mm7 hydrides were produced by reactive mechanical milling (RMM) under hydrogen atmosphere. Milling first under argon, and then under hydrogen atmosphere was also carried out in order to study the effect of the gas atmosphere on the microstructure of the products of milling as well as on their hydriding properties. In both cases, the main product of the milling proce...
Erbium-doped aluminum oxide (Al2O3:Er) is a promising material for integrated amplifier or tunable laser applications due to its wide gain spectrum around 1550 nm. We deposited Al2O3 layers on thermally oxidized Si-wafers by reactive co-sputtering at 550°C [1]. Propagation losses were 0.11 dB/cm at λ =1.5 μm. Channel waveguides were fabricated by reactive ion etching with propagation losses dow...
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