نتایج جستجو برای: pentagon heptagon pair defect
تعداد نتایج: 213745 فیلتر نتایج به سال:
Given a convex polygon of n sides, one can draw n disks (called side disks) where each disk has a different side of the polygon as diameter and the midpoint of the side as its center. The intersection graph of such disks is the undirected graph with vertices the n disks and two disks are adjacent if and only if they have a point in common. We prove that for every convex polygon this graph is pl...
Ceriuii dioxide doped with y 3 + ions, which is of interest for its ionic conductivity, is here studied by anelastic ~~~ethods. The internal friction peaks observed are analyzed intc peals A , B, C (with Hr = 0.64, 0.71 and 0.78 eV, respectively). Peak A, present at low y3+ concentrations is established to be due to a W pair (V = oxygen-ion vacancy), which is a charged defect conpensated by an ...
Using density functional theory we investigate the electronic and atomic structure of fullerene-like boron nitride cage structures. The pentagonal ring leads to the formation of homonuclear bonds. The homonuclear bonds are also found in other BN structures having pentagon line defect. The calculated thermodynamics and vibrational spectra indicated that, among various stable configurations of BN...
2014 The atomic configuration of the EL2 defect in its stable state has been determined as an arsenic antisite defect associated with an arsenic interstitial at a next nearest neighbour site. The metastable EL2 state is tentatively assigned to an arsenic pair defect at a gallium lattice site (As-As )Ga. Revue Phys. Appl. 23 (1988) 803-807 MAI 1988, Classification Physics Abstracts 61.70 71.55 7...
One-pot, multi-molecular macrocyclization allows the highly selective preparation of pentagon-shaped circular aromatic pentamers mediated by an inward-pointing continuous hydrogen-bonding network.
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