نتایج جستجو برای: 0991 and 0961
تعداد نتایج: 16827202 فیلتر نتایج به سال:
A general organometallic route has been developed to synthesize Co(x)Ni(1-x) and Co(x)Fe(1-x) alloy nanoparticles with a fully tunable composition and a size of 4-10 nm with high yield. In contrast to previously reported synthesis methods using dicobalt octacarbonyl (Co(2)(CO)(8)), here the cobalt-cobalt bond in the carbonyl complex is first broken with anhydrous acetone. The acetonated compoun...
problem exacerbated by mixed surrounds (4, 7)], in agreement with the behavior of a major class of cortical cells (10), as well as with psychophysical evidence for color/luminance interactions (I 1). All of this bears on Masland's dichotomy between the multiplexing (co-coding) and parallel channel approaches. Models that do not filter parvo cells do not account for the properties of cortical ce...
Manuscript received on March 08, 1999. This work was supported in part by CAPES – Brasilia, Brazil. The authors are with the Department of Computer Science and Engineering, Florida Atlantic University, Boca Raton, Florida, 33431-0991, USA (e-mail:[email protected]; [email protected]). Abstract One of the weaknesses of most Web-based distance education systems is the lack of adequate, synchro...
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