نتایج جستجو برای: Armchair

تعداد نتایج: 1353  

Journal: :Synthese 2011
Clayton Mitchell Littlejohn

In this paper, I shall discuss a problem that arises when you try to combine an attractive account of what constitutes evidence with an independently plausible account of the kind of access we have to our evidence. According to E=K, our evidence consists of what we know. According to the principle of armchair access, we can know from the armchair what our evidence is. Combined, these claims ent...

2012
Toshiaki Enoki Katsunori Wakabayashi Ken-ichi Sasaki Takeshi Nakanishi

In graphene edges or nanographene, the presence of edges strongly affects the electronic structure depending on their edge shape (zigzag and armchair edges) as observed with the electron wave interference and the creation of non-bonding π -electron state (edge state). We investigate the edge-inherent electronic features and the magnetic properties of edge-sate spins in nanographene/graphene edg...

Journal: :journal of physical & theoretical chemistry 2009
goudarz m. rouzbehani temer s. ahmadi ahmed seif

geometrical structure, nuclear magnetic resonance (n1,1it) chemical shielding tensors, and chemical shiftsof silicon and carbon nucler are investigated for twn infinite size zigzag and armchair single-walled siliconcarbide nanotabes (sicnts). geometrical structures of sients, sit bonds and bond angles of st and cvertices in both zigzag and armchair nanotubes, indicate that bond lengths are appr...

2011
Jürgen Wurm Michael Wimmer Klaus Richter

We study the conductance of graphene nanoribbons with long-range disorder. Due to the absence of intervalley scattering from the disorder potential, time-reversal symmetry (TRS) can be effectively broken even without a magnetic field, depending on the type of ribbon edge. Even though armchair edges generally mix valleys, we show that metallic armchair nanoribbons possess a hidden pseudovalley s...

Journal: :ACS nano 2010
Erik H Hároz William D Rice Benjamin Y Lu Saunab Ghosh Robert H Hauge R Bruce Weisman Stephen K Doorn Junichiro Kono

We have used resonant Raman scattering spectroscopy to fully analyze the relative abundances of different (n,m) species in single-walled carbon nanotube samples that are metallically enriched by density gradient ultracentrifugation. Strikingly, the data clearly show that our density gradient ultracentrifugation process enriches the metallic fractions in armchair and near-armchair species. We ob...

Journal: :Nanotechnology 2007
Thushari Jayasekera J W Mintmire

We study the transport properties of multiterminal graphene nanodevices using the Landauer-Buttiker approach and the tight binding model. We consider a four-terminal device made at the crossing of a zigzag and armchair nanoribbons and two types of T-junction devices. The transport properties of graphene multiterminal devices are highly sensitive to the details of the junction region. Thus the p...

2009
Karen Renaud Joseph Maguire

Alphanumeric authentication, by means of a secret, is not only a powerful mechanism, in theory, but prevails over all its competitors in practice. However, it is clearly inadequate in a world where increasing numbers of systems and services require people to authenticate in a shared space, while being actively observed. This new reality places pressure on a password mechanism never intended for...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید