scholarly journals Defect Dynamics in Graphene

2020 ◽  
Vol 5 (1) ◽  
pp. 26-34
Author(s):  
Aalim M. Malik ◽  
M. Ashraf Shah ◽  
Nikhilesh K. Dilwaliya ◽  
Vikash Dahiya
Keyword(s):  
Grain Boundary ◽  
Reference Frame ◽  
Theoretical Study ◽  
Condensed Matter ◽  
Two Dimensional ◽  
Long Wavelength ◽  
Hamiltonian Model ◽  
Different Types ◽  
Crystallographic Axes ◽  
Dirac Hamiltonian

The experimental and theoretical study of graphene, two-dimensional (2D) graphite, is an extremely rapidly growing field of today's condensed matter research. Different types of disorder in graphene modify the Dirac equation leading to unusual spectroscopic and transport properties. The authors studied one of the disorders (i.e., grain boundaries) and formulated a theoretical model of graphene grain boundary by generalizing the two-dimensional graphene Dirac Hamiltonian model. In this model only, the authors considered the long-wavelength limit of the particle transport, which provides the main contribution to the graphene conductance. In this work, they derived the Hamiltonian in a rotated side dependent reference frame describing crystallographic axes mismatching at a grain boundary junction and showed that properties like energy spectrum are an independent reference frame. Also, they showed one of the topological property of graphene.

A Theoretical Approach to Bow Deck Wetness of a High-Speed Ship

1990 ◽  
Vol 34 (03) ◽  
pp. 163-171 ◽  
Author(s):  
Ken Takagi ◽  
Akihiro Niimi
Keyword(s):  
Froude Number ◽  
Theoretical Approach ◽  
Analytical Method ◽  
High Speed ◽  
Theoretical Study ◽  
Two Dimensional ◽  
Long Wavelength ◽  
High Froude Number ◽  
Self Similar ◽  
Deck Wetness

A theoretical study of the phenomenon of deck wetness is presented and effects of the flare shape are discussed. It is shown that two-dimensional (2D) self-similar flow is applicable to the analysis of deck wetness on the assumption of long wavelength and high Froude number. The 2D self-similar flow which includes effects of the deck is calculated by an analytical method. Calculated results are compared with experimental results obtained at the limit of long wavelength, that is, in still water. Calculated results are used to determine the most suitable flare angle, and it is shown that increased flare is more effective than a knuckle to reduce bow deck wetness.

Influence of solvent polarity on the dual fluorescence of p-N,N-dimethylaminobenzonitrile: An AM1 theoretical study

1990 ◽  
Vol 55 (8) ◽  
pp. 1891-1895 ◽  
Author(s):  
Peter Ertl
Keyword(s):  
Excited State ◽  
Theoretical Study ◽  
Solvent Polarity ◽  
Semiempirical Method ◽  
Dual Fluorescence ◽  
Long Wavelength ◽  
Polar Media ◽  
Wavelength Emission ◽  
Ground State Geometry ◽  
Influence Of Solvent

Twisting of the NMe2 group in p-N,N-dimethylaminobenzonitrile (DMABN) was investigated using AM1 semiempirical method with configuration interaction. Effect of polar media was considered by placing + and - charge centers ("sparkles") at appropriate places opposite the molecule. Optimized ground state geometry of DMABN is slightly twisted with the lowest vertical excited state of 1B character. As the polarity of media increases and/or the - NMe2 group twists, the symmetric 1A excited state having considerable charge separation becomes energetically favorable. Anomalous long-wavelength emission of DMABN comes from this state.

Theoretical study on two dimensional group IV-VI ternary compounds with large in-plane spontaneous polarization

2021 ◽  
Vol 198 ◽  
pp. 110688
Author(s):  
Hui Fang ◽  
Bing Wang ◽  
Xiwen Zhang ◽  
Yilv Guo ◽  
Liang Ma ◽  
...  
Keyword(s):  
Spontaneous Polarization ◽  
Theoretical Study ◽  
Group Iv ◽  
Two Dimensional ◽  
Ternary Compounds ◽  
Dimensional Group

Two-Dimensional Room-Temperature Giant Antiferrodistortive SrTiO3 at a Grain Boundary

2021 ◽  
Vol 126 (22) ◽  
Author(s):  
Bo Han ◽  
Ruixue Zhu ◽  
Xiaomei Li ◽  
Mei Wu ◽  
Ryo Ishikawa ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Two Dimensional

Theoretical Study of Electronic Transport in Two-Dimensional Materials

2021 ◽  
Author(s):  
M. V. Fischetti ◽  
M. L. Van de Put ◽  
G. Gaddemane ◽  
S. Chen ◽  
W. G. Vandenberghe ◽  
...  
Keyword(s):  
Electronic Transport ◽  
Theoretical Study ◽  
Two Dimensional ◽  
Two Dimensional Materials

Effects of Heat Transfer During Peristaltic Transport in Nonuniform Channel With Permeable Walls

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Siddharth Shankar Bhatt ◽  
Amit Medhavi ◽  
R. S. Gupta ◽  
U. P. Singh
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Incompressible Fluid ◽  
Friction Force ◽  
Viscous Incompressible Fluid ◽  
Peristaltic Transport ◽  
Two Dimensional ◽  
Peristaltic Motion ◽  
Long Wavelength ◽  
Permeable Walls

In the present investigation, problem of heat transfer has been studied during peristaltic motion of a viscous incompressible fluid for two-dimensional nonuniform channel with permeable walls under long wavelength and low Reynolds number approximation. Expressions for pressure, friction force, and temperature are obtained. The effects of different parameters on pressure, friction force, and temperature have been discussed through graphs.

Segregation of H, C and B to Σ = 5 (0 1 3) α-Fe grain boundary: A theoretical study

2006 ◽  
Vol 253 (4) ◽  
pp. 1939-1945 ◽  
Author(s):  
S. Gesari ◽  
B. Irigoyen ◽  
A. Juan
Keyword(s):  
Grain Boundary ◽  
Theoretical Study

Bifurcation analysis of two-dimensional laminar flow through sudden expansion channel

2022 ◽  
Vol 13 (1) ◽  
pp. 0-0
Keyword(s):  
Laminar Flow ◽  
Expansion Ratio ◽  
Sudden Expansion ◽  
Two Dimensional ◽  
Governing Equations ◽  
Bifurcation Phenomena ◽  
Different Types ◽  
Fluent Software ◽  
Flow Through ◽  
Volume Method

In this work, bifurcation characteristics of unsteady, viscous, Newtonian laminar flow in two-dimensional sudden expansion and sudden contraction-expansion channels have been studied for different values of expansion ratio. The governing equations have been solved using finite volume method and FLUENT software has been employed to visualize the simulation results. Three different mesh studies have been performed to calculate critical Reynolds number (Recr) for different types of bifurcation phenomena. It is found that Recr decreases with the increase in expansion ratio (ER).

The method of repairing OHE damaged ancient painted murals based on machine vision

2021 ◽  
pp. 1-15
Author(s):  
Hao Li
Keyword(s):  
Machine Vision ◽  
Two Dimensional ◽  
Traditional Methods ◽  
Dimensional Image ◽  
Two Dimensional Image ◽  
Different Types ◽  
Damage Data ◽  
Incomplete Damage

Traditional mural repair methods only observe the texture of murals when segmenting the repair area, but ignore the extraction of a mural damage data, resulting in incomplete damage crack information. For this reason, the method of repairing the damaged murals based on machine vision is studied. Using machine vision, it can get two-dimensional image of a mural, preprocess the image, extract the damaged data of a mural, and then divide the repair area and repair degree index. According to different types of damage, it can choose the corresponding repair methods to achieve the repair of damaged mural. The results show: Compared with the reference [1] method and reference [2] method, the number of repair points and repair cracks extracted by the proposed method is more than that of the two traditional methods, which can more accurately and comprehensively extract the repair information of murals.

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