توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Ab Initio Study of Chirality Effects Onphonon Spectra, Mechanical and Thermal Properties of Nearly Samediameter Single Wall Carbon Nanotubes
اطلاعات انتشار: International Journal Of Nanoscience and Nanotechnology، دهم،شماره۳، Sep ۲۰۱۴، سال
تعداد صفحات: ۸
In this paper, we have used density functional perturbation theory (DFPT) and Pseudo–potential method to calculate the phonon spectrum, phonon density of states (DOS), specific heat capacity and mechanical properties of (5,5) armchair and (9,0) zigzag Single Wall Carbon Nanotubes (SWCNTs). Our calculations show that Young’s modulusfor (5,5) and (9,0) nanotubesare higher than 1TPa. We have also shown that the value of compressive Young’s modulus for (5,5) nanotube isgreater thanthat for (9,0) nanotube while thevalue of tensile Young’s modulus for (9,0) nanotubeisgreater than that for(5,5) nanotube. The result of our calculations shows that thespecific heat capacity of (5,5) and (9,0) nanotubes coincides, therefore we may conclude that thespecific heat capacity of nanotubes is independent of their chirality. Furthermore we have found that the atoms in the armchair nanotubes are positioned as close as possible in the direction of the nanotube axis, therefore they could have more resistant against compressive pressure

۲Embedding of a 2D Graphene System in Non–Commutative Space
نویسنده(ها): ، ،
اطلاعات انتشار: Journal of Nano Structures، سوم،شماره۳، ۲۰۱۳، سال
تعداد صفحات: ۸
The BFT approach is used to formulate the electronic states in graphene through a non–commutative space in the presence of a constant magnetic field B for the first time. In this regard, we introduce a second class of constrained system, which is not gauge symmetric but by applying BFT method and extending phase space, the second class constraints converts to the first class constraints so the system becomes a gauge symmetric.
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