منابع مشابه
Five-fold symmetry in crystalline quasicrystal lattices.
To demonstrate that crystallographic methods can be applied to index and interpret diffraction patterns from well-ordered quasicrystals that display non-crystallographic 5-fold symmetry, we have characterized the properties of a series of periodic two-dimensional lattices built from pentagons, called Fibonacci pentilings, which resemble aperiodic Penrose tilings. The computed diffraction patter...
متن کامل5-refinement Wavelets with 4-fold Symmetry
Recently √ 5-refinement hierarchical sampling has been studied and √ 5-refinement has been used for surface subdivision. Compared with other refinements such as the dyadic or quincunx refinement, √ 5-refinement has a special property that the nodes in a refined lattice form groups of five nodes with these five nodes having different x and y coordinates. This special property has been shown to b...
متن کاملNatural quasicrystal with decagonal symmetry
We report the first occurrence of a natural quasicrystal with decagonal symmetry. The quasicrystal, with composition Al71Ni24Fe5, was discovered in the Khatyrka meteorite, a recently described CV3 carbonaceous chondrite. Icosahedrite, Al63Cu24Fe13, the first natural quasicrystal to be identified, was found in the same meteorite. The new quasicrystal was found associated with steinhardtite (Al38...
متن کاملA Quasi-Unit Cell Model for Al-Ni-Co Ideal Quasicrystal based on Clusters with Broken 10-fold Symmetry
We have constructed a structural solution for the Al72Ni20Co8 decagonal quasicrystal based on the quasi-unit cell picture. The solution gives a significantly improved fit to experiments compared to a previous proposal by us while retaining the feature that the fundamental, repeating cluster has broken 10-fold symmetry. We present a series of arguments, including new evidence based on high-resol...
متن کاملEfficiency of Endoneural Stimulation with 5- to 24-fold Multielectrodes
Optimal selective stimulation of nerve with endoneurally (intrafascicularly) inserted multi-microelectrodes means that each electrode activates, with its own threshold stimulation current, as few distinct motoneurons as possible, preferibly only one. If the latter is the case, the efficiency of a multi electrode is 100%. However, neighbouring electrodes may control the same motor fiber(s), as t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nihon Kessho Gakkaishi
سال: 1986
ISSN: 0369-4585,1884-5576
DOI: 10.5940/jcrsj.28.291