نتایج جستجو برای: honeycomb structure

تعداد نتایج: 1571739  

2015
W. Beugeling E. Kalesaki C. Delerue Y.-M. Niquet D. Vanmaekelbergh C. Morais Smith

Research on graphene has revealed remarkable phenomena arising in the honeycomb lattice. However, the quantum spin Hall effect predicted at the K point could not be observed in graphene and other honeycomb structures of light elements due to an insufficiently strong spin-orbit coupling. Here we show theoretically that 2D honeycomb lattices of HgTe can combine the effects of the honeycomb geomet...

Journal: :Nano letters 2014
Feng-Chuan Chuang Liang-Zi Yao Zhi-Quan Huang Yu-Tzu Liu Chia-Hsiu Hsu Tanmoy Das Hsin Lin Arun Bansil

We use first-principles electronic structure calculations to predict a new class of two-dimensional (2D) topological insulators (TIs) in binary compositions of group III elements (B, Al, Ga, In, and Tl) and bismuth (Bi) in a buckled honeycomb structure. We identify band inversions in pristine GaBi, InBi, and TlBi bilayers, with gaps as large as 560 meV, making these materials suitable for room-...

Journal: :Nano letters 2013
Linfei Li Yeliang Wang Shengyi Xie Xian-Bin Li Yu-Qi Wang Rongting Wu Hongbo Sun Shengbai Zhang Hong-Jun Gao

Two-dimensional (2D) honeycomb systems made of elements with d electrons are rare. Here, we report the fabrication of a transition metal (TM) 2D layer, namely, hafnium crystalline layers on Ir(111). Experimental characterization reveals that the Hf layer has its own honeycomb lattice, morphologically identical to graphene. First-principles calculations provide evidence for directional bonding b...

Journal: :Physical review letters 2013
Conor Hogan Elena Ferraro Niall McAlinden John F McGilp

The intensively studied Si(111)-(5×2)-Au surface is reexamined using reflectance anisotropy spectroscopy and density functional theory simulations. We identify distinctive spectral features relating directly to local structural motifs such as Si honeycomb chains and atomic gold wires that are commonly found on Au-reconstructed vicinal Si(111) surfaces. Optical signatures of chain dimerization, ...

Journal: :Biotechnology and bioengineering 2006
Joseph George Yoshinori Kuboki Teruo Miyata

Tissue engineering using living cells is emerging as an alternative to tissue or organ transplantation. The adult mesenchymal stem cells can be differentiated into multilineage cells, such as adipocytes, chondrocytes, or osteoblasts when cultured with specific growth factors. In the present investigation, we have studied the effect of honeycomb collagen scaffolds for the adhesion, differentiati...

Journal: :Mathematics 2023

Auxetic honeycomb has unique mechanical properties such as good energy absorption capacity, tensile strength and fracture toughness, etc. Therefore, with a negative Poisson’s ratio is used widely in medical, biological, aerospace other fields. This large deformations vibration reduction. It very important to study the nonlinear constitutive of structure. this paper establishes relationship auxe...

Journal: :The International Journal of Advanced Manufacturing Technology 2021

Machining of Nomex® honeycomb materials is the biggest challenge in industry because complex forms and geometry structure. The latter characterized by a low density with orthotropic mechanical behavior. thin walls composite structure make shaping this material very difficult. Studying interactions between cutting tool material, forces, chip formation allow to understand machining process honeyc...

2006
C. Battaglia P. Aebi

The atomic structure of self-assembled quasi-one-dimensional Gd chains on Si(111) has been investigated by low-energy electron diffraction and scanning tunneling microscopy. Based on comparison between Gd and Ca chains we show that this Gd induced surface reconstruction belongs to the class of honeycomb chain-channel structures. This clearly demonstrates that, besides monovalent and divalent ad...

Journal: :فصلنامه علمی پژوهشی مهندسی مکانیک جامدات واحد خمینی شهر 0
milad shahsavari msc student, department of islamic azad university, tehran north branch, tehran, iran m. asgari - assistant professor, department of k.n.toosi university of technology, tehran, iran

in this paper deflection and free vibration of sandwich panel is studied. the core of sandwich panels is made of hexagonal honeycomb and faces are made of two different materials of carbon fiber reinforced plastic and k-aryl/epoxy covering. the governing equations are deduced from the first order sheer deformation theory (fsdt) and they are solved using generalized differential quadrature metho...

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