Molecular Dynamics Study of Electron Irradiation Damages in Carbon Nanomaterials

2007 ◽  
Vol 1057 ◽  
Author(s):  
Masaaki Yasuda ◽  
Takashi Majima ◽  
Yoshihisa Kimoto ◽  
Kazuhiro Tada ◽  
Hiroaki Kawata ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Cross Section ◽  
Electron Irradiation ◽  
Carbon Nanomaterials ◽  
Primary Energy ◽  
Single Walled Carbon Nanotube ◽  
The Monte Carlo Method ◽  
Cross Links

ABSTRACTMolecular dynamics (MD) studies are carried out to investigate the electron irradiation damages in carbon nanomaterials. The interaction between an incident electron and a carbon atom is modeled based on the Monte Carlo method using the elastic scattering cross section. The electron irradiation damages in graphen, graphite, single-walled carbon nanotube (SWNT) and carbon nanopeapod are demonstrated. The cross-links among the nanostructures caused by the knock-on effect are observed as typical damages. The dependence of the damages on the electron primary energy is also shown for the SWNT.

Mathematical verification of the Monte Carlo maximum cross-section technique

2015 ◽  
Vol 21 (4) ◽  
Author(s):  
Victor S. Antyufeev
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Cross Section ◽  
Path Length ◽  
Radiation Transport ◽  
Free Path Length ◽  
Maximum Cross Section ◽  
The Monte Carlo Method ◽  
Section Technique ◽  
Probabilistic Proof

AbstractMaximum cross-section technique is used for solving problems of radiation transport by the Monte Carlo method to optimize the particles' free-path length modeling in inhomogeneous media. A probabilistic proof of a variation of this technique is proposed in the article.

Simulation of Atomistic Crystal Growth from the Vapor Phase

1986 ◽  
Vol 77 ◽  
Author(s):  
Paul A. Taylor ◽  
Brian W. Dodson
Keyword(s):  
Molecular Dynamics ◽  
Monte Carlo ◽  
Crystal Growth ◽  
Monte Carlo Method ◽  
Vapor Phase ◽  
Time Scale ◽  
Transient Dynamics ◽  
Strained Layer ◽  
The Monte Carlo Method ◽  
Long Time

ABSTRACTWe are in the process of studying strained-layer growth of two-dimensional Lennard-Jones lattices. To do so, we have developed three techniques, based on the Monte Carlo method and molecular dynamics, of simulating atomistic crystal growth from the vapor phase. The Monte Carlo method efficiently simulates the effects of long time-scale processes on the growth of strained-layer systems, but omits the transient dynamics of particle adsorption. The second technique, using molecular dynamics, gives results suggesting that epitaxial growth of strained-layer systems can occur on the picosecond timescales. However, this technique cannot capture the influence of the long time-scale processes on the growth process. In view of the shortcomings of the previous two techniques, A hybrid technique incorporating both the Monte Carlo method and molecular dynamics, has been developed. In principle, this technique models the transient dynamics of adsorption as well as the long term evolution of the system. This technique, however, is limited by artifacts that may only be eliminated by use of unwarrented amounts of supercomputer time.

Interaction volume of electron beam in carbon nanomaterials: A molecular dynamics study

2014 ◽  
Vol 1700 ◽  
pp. 29-35
Author(s):  
Masaaki Yasuda ◽  
Shinya Wakuda ◽  
Yoshiki Asayama ◽  
Hiroaki Kawata ◽  
Yoshihiko Hirai
Keyword(s):  
Molecular Dynamics ◽  
Electron Beam ◽  
Carbon Atom ◽  
Electron Irradiation ◽  
Md Simulation ◽  
Carbon Nanomaterials ◽  
Primary Energy ◽  
Binary Collision ◽  
Collision Theory ◽  
Interaction Volume

ABSTRACTA molecular dynamics (MD) simulation was performed to study the interaction volume of electron beam in carbon nanomaterials. The interaction between incident electron and carbon atom in the target materials during electron irradiation is introduced by the relativistic binary collision theory. The motion of each atom in the material under electron irradiation is calculated with the MD simulation. The primary energy dependence of the interaction volume in the carbon nanotube and the multi-layered graphene are studied. The secondary damages caused by the knock-on atoms are also discussed.

scholarly journals Сапфировый нейрохирургический зонд для аспирации опухолей мозга с демаркацией границ с помощью спектроскопии-=SUP=-*-=/SUP=-

2019 ◽  
Vol 126 (5) ◽  
pp. 627
Author(s):  
И.А. Шикунова ◽  
И.Н. Долганова ◽  
Г.М. Катыба ◽  
К.И. Зайцев ◽  
В.Н. Курлов
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Brain Tumors ◽  
Blood Vessels ◽  
Cross Section ◽  
Variable Cross Section ◽  
Laser Coagulation ◽  
Variable Cross ◽  
The Monte Carlo Method ◽  
Fluorescence Diagnostics

AbstractA contact sapphire neurosurgical probe for the removal of brain tumors with the possibility of intraoperative exogenous fluorescence diagnostics and laser coagulation of adjacent blood vessels has been developed. The geometry of the sapphire neuroprobe has been optimized to increase the sensitivity of fluorescence diagnostics. For this purpose, a series of computational experiments have been performed using the Monte Carlo method. The technique for growing a sapphire shaped crystal with a variable cross section has been developed. Using this technique, a pilot prototype of the sapphire neuroprobe has been manufactured. The sample has been approbated experimentally.

scholarly journals Radially convergent 30–100-μs e-beam-pumped Xe and Ne lasers

1994 ◽  
Vol 12 (4) ◽  
pp. 633-646 ◽  
Author(s):  
A.S. Bugaev ◽  
N.N. Koval ◽  
M.I. Lomaev ◽  
S.V. Mel'chenko ◽  
V.V. Ryzhov ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Active Medium ◽  
Cross Section ◽  
Spectral Characteristics ◽  
Laser Output ◽  
Small Signal Gain ◽  
Small Signal ◽  
The Monte Carlo Method ◽  
Deposited Energy

The design scheme of a radially convergent 30-, 70-, or 100-μs e-beam-pumped laser with 9 or 18 1 excited volume is described. Amplitude, temporal, and spectral characteristics of the laser output, as well as laser thresholds in (Ar–Xe, He–Ar–Xe, He–Ne–Ar, and He– Ne–Ar–H2) gas mixtures have been investigated. The distribution of the specific deposited energy over the laser chamber cross section has been calculated by the Monte Carlo method. The small signal gain and unsaturable loss values of the active medium were measured for a Penning plasma Ne laser at λ = 0.585 μm.

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