scholarly journals Elementary building blocks of graphene-nanoribbon-based electronic devices

2007 ◽  
Vol 90 (22) ◽  
pp. 223115 ◽  
Author(s):  
Zhiping Xu ◽  
Quan-Shui Zheng ◽  
Guanhua Chen
Keyword(s):  
Electronic Devices ◽  
Building Blocks ◽  
Graphene Nanoribbon ◽  
Elementary Building

scholarly journals Similarities between extreme events in the solar-terrestrial system by means of nonextensivity

2011 ◽  
Vol 18 (5) ◽  
pp. 563-572 ◽  
Author(s):  
G. Balasis ◽  
C. Papadimitriou ◽  
I. A. Daglis ◽  
A. Anastasiadis ◽  
I. Sandberg ◽  
...  
Keyword(s):  
Extreme Events ◽  
Solar Flares ◽  
Particle Physics ◽  
Building Blocks ◽  
Magnetic Storms ◽  
Earthquake Dynamics ◽  
Magnitude Distribution ◽  
Terrestrial System ◽  
Universal Principles ◽  
Elementary Building

Abstract. The dynamics of complex systems are founded on universal principles that can be used to describe disparate problems ranging from particle physics to economies of societies. A corollary is that transferring ideas and results from investigators in hitherto disparate areas will cross-fertilize and lead to important new results. In this contribution, we investigate the existence of a universal behavior, if any, in solar flares, magnetic storms, earthquakes and pre-seismic electromagnetic (EM) emissions, extending the work recently published by Balasis et al. (2011a). A common characteristic in the dynamics of the above-mentioned phenomena is that their energy release is basically fragmentary, i.e. the associated events are being composed of elementary building blocks. By analogy with earthquakes, the magnitude of the magnetic storms, solar flares and pre-seismic EM emissions can be appropriately defined. Then the key question we can ask in the frame of complexity is whether the magnitude distribution of earthquakes, magnetic storms, solar flares and pre-fracture EM emissions obeys the same law. We show that these apparently different extreme events, which occur in the solar-terrestrial system, follow the same energy distribution function. The latter was originally derived for earthquake dynamics in the framework of nonextensive Tsallis statistics.

scholarly journals Connectivity matters – ultrafast isomerization dynamics of bisazobenzene photoswitches

2016 ◽  
Vol 18 (22) ◽  
pp. 14795-14804 ◽  
Author(s):  
Chavdar Slavov ◽  
Chong Yang ◽  
Luca Schweighauser ◽  
Chokri Boumrifak ◽  
Andreas Dreuw ◽  
...  
Keyword(s):  
Building Blocks ◽  
Ultrafast Dynamics ◽  
Elementary Building

We have investigated the ultrafast dynamics of o-, m- and p-bisazobenzenes, which represent elementary building blocks for photoswitchable multiazobenzene nanostructures.

Hierarchical nanomechanics of vimentin alpha helical coiled-coil proteins

2006 ◽  
Vol 978 ◽  
Author(s):  
Theodor Ackbarow ◽  
Markus J. Buehler
Keyword(s):  
Atomistic Simulation ◽  
Coiled Coil ◽  
Building Blocks ◽  
Tensile Tests ◽  
Coiled Coils ◽  
Atomistic Modeling ◽  
Alpha Helices ◽  
Hierarchical Assembly ◽  
Leading Role ◽  
Elementary Building

AbstractCoiled-coil alpha-helical dimers are the elementary building blocks of intermediate filaments (IFs), an important component of the cell's cytoskeleton. Therefore, IFs play a leading role in the mechanical integrity of the cells. Here we use atomistic simulation to carry out tensile tests on coiled-coils as well as on single alpha-helices of the 2B segment of the vimentin dimer that has been shown to control the large-deformation behavior of cells. We compare the characteristic force-strain curves of both structures and suggest explanations for the differences on this fundamental level of hierarchical assembly. We further systematically explore the strain rate dependence of the mechanical properties of the vimentin coiled-coil protein. We develop a simple continuum model capable of reproducing the atomistic modeling results. The model enables us to extrapolate to much lower deformation rates approaching those used in experiment.

Carbon Nanotube Based Molecular Electronic Devices

1998 ◽  
Vol 13 (9) ◽  
pp. 2357-2362 ◽  
Author(s):  
Madhu Menon ◽  
Deepak Srivastava
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Carbon Nanotube ◽  
Electronic Devices ◽  
Tight Binding ◽  
Single Walled Carbon Nanotubes ◽  
Building Blocks ◽  
Local Minima ◽  
Molecular Electronic ◽  
Walled Carbon Nanotubes

Complex three-point junctions of single-walled carbon nanotubes are proposed as building blocks of nanoscale electronic devices. Both T- and Y-junctions, made up of tubes with differing diameters and chiralities, are studied as prototypes. All the proposed complex junctions have been found to be local minima of the total energy on relaxation with a generalized tight-binding molecular dynamics scheme.

Elementary Building Blocks of Self-Assembled Peptide Nanotubes

2010 ◽  
Vol 132 (44) ◽  
pp. 15632-15636 ◽  
Author(s):  
Nadav Amdursky ◽  
Michel Molotskii ◽  
Ehud Gazit ◽  
Gil Rosenman
Keyword(s):  
Building Blocks ◽  
Peptide Nanotubes ◽  
Self Assembled ◽  
Elementary Building

scholarly journals PARTITION FUNCTIONS OF MATRIX MODELS: FIRST SPECIAL FUNCTIONS OF STRING THEORY

2004 ◽  
Vol 19 (24) ◽  
pp. 4127-4163 ◽  
Author(s):  
A. ALEXANDROV ◽  
A. MOROZOV ◽  
A. MIRONOV
Keyword(s):  
String Theory ◽  
Partition Function ◽  
Matrix Model ◽  
Special Functions ◽  
Finite Size ◽  
Building Blocks ◽  
Partition Functions ◽  
Virasoro Constraints ◽  
Elementary Building

Even though matrix model partition functions do not exhaust the entire set of τ-functions relevant for string theory, they seem to be elementary building blocks for many others and they seem to properly capture the fundamental symplicial nature of quantum gravity and string theory. We propose to consider matrix model partition functions as new special functions. Here we restrict our consideration to the finite-size Hermitian 1-matrix model and concentrate mostly on its phase/branch structure arising when the partition function is considered as a D-module. We discuss the role of the CIV–DV prepotential (as generating a possible basis in the linear space of solutions to the Virasoro constraints, but with a lack of understanding of why and how this basis is distinguished).

Molecular Dynamics Study of Graphene Nanoflake Shuttle Device on Graphene Nanoribbon with Carbon Nanotube Blocks

2020 ◽  
Vol 20 (9) ◽  
pp. 5570-5574
Author(s):  
Jeong Won Kang ◽  
Ki-Sub Kim ◽  
Oh-Kuen Kwon
Keyword(s):  
Molecular Dynamics ◽  
Carbon Nanotube ◽  
External Force ◽  
Nonvolatile Memory ◽  
High Speed ◽  
Building Blocks ◽  
Graphene Nanoribbon ◽  
Local Energy ◽  
Mass Storage ◽  
Potential Wells

Superlubric motions of graphene nanoflakes (GNFs) on graphene have opened up more applications of graphene for micromachines and nanomachines. Here, we investigate the dynamic behavior of a GNF shuttle on a graphene nanoribbon (GNR) with carbon nanotube (CNT) blocks via molecular dynamics simulations. The GNF moves on a GNR superlubrically, and the CNTs as building blocks induce bistable potential wells so that the GNF is stabilized. MD simulation results indicate that when a GNF shuttle approaches the CNTs, a potential well is created by an increase in the attractive van der Waals energy between the GNF and CNTs, and bistability at the local energy minima positions can be achieved near the CNTs. In order for the GNF shuttle to escape the local energy minima positions, a high external force must be applied to overcome the potential energy barrier. However, after the GNF shuttle escapes from one of the bistable positions, only a low external force is required to stabilize the GNF shuttle. This work explicitly demonstrates that a GNF-GNR/CNT system could be applied to alternative nonvolatile memory and high-speed mass storage by using GNR-CNT arrays.

scholarly journals Layered assemblers for scalable parallel integration

2020 ◽  
Vol 17 (171) ◽  
pp. 20200543
Author(s):  
Jonathan Hiller ◽  
Joni Mici ◽  
Hod Lipson
Keyword(s):  
Linear Time ◽  
Building Blocks ◽  
Spherical Building ◽  
Technological Complexity ◽  
Large Numbers ◽  
Complex Adaptive ◽  
Parallel Integration ◽  
Assembly Principles ◽  
Elementary Building ◽  
Small Building

Many complex natural and artificial systems are composed of large numbers of elementary building blocks, such as organisms made of many biological cells or processors made of many electronic transistors. This modular substrate is essential to the evolution of biological and technological complexity, but has been difficult to replicate for mechanical systems. This study seeks to answer if layered assembly can engender exponential gains in the speed and efficacy of block or cell-based manufacturing processes. A key challenge is how to deterministically assemble large numbers of small building blocks in a scalable manner. Here, we describe two new layered assembly principles that allow assembly faster than linear time, integrating n modules in O( n 2/3 ) and O( n 1/3 ) time: one process uses a novel opto-capillary effect to selectively deposit entire layers of building blocks at a time, and a second process jets building block rows in rapid succession. We demonstrate the fabrication of multi-component structures out of up to 20 000 millimetre scale spherical building blocks in 3 h. While these building blocks and structures are still simple, we suggest that scalable layered assembly approaches, combined with a growing repertoire of standardized passive and active building blocks could help bridge the meso-scale assembly gap, and open the door to the fabrication of increasingly complex, adaptive and recyclable systems.

scholarly journals Simulation and Optimization of Electromagnetic Absorption of Polycarbonate/CNT Composites Using Machine Learning

Micromachines ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 778
Author(s):  
Lakhdar Sidi Salah ◽  
Mohamed Chouai ◽  
Yann Danlée ◽  
Isabelle Huynen ◽  
Nassira Ouslimani
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Waves ◽  
Electronic Devices ◽  
Target Material ◽  
Building Blocks ◽  
Microwave Range ◽  
Emi Shielding ◽  
Calculation Time ◽  
Simulation And Optimization ◽  
Electromagnetic Absorption

Electronic devices that transmit, distribute, or utilize electrical energy create electromagnetic interference (EMI) that can lead to malfunctioning and degradation of electronic devices. EMI shielding materials block the unwanted electromagnetic waves from reaching the target material. EMI issues can be solved by using a new family of building blocks constituted of polymer and nanofillers. The electromagnetic absorption index of this material is calculated by measuring the “S-parameters”. In this article, we investigated the use of artificial intelligence (AI) in the EMI shielding field by developing a new system based on a multilayer perceptron neural network designed to predict the electromagnetic absorption of polycarbonate-carbon nanotubes composites films. The proposed system included 15 different multilayer perception (MLP) networks; each network was specialized to predict the absorption value of a specific category sample. The selection of appropriate networks was done automatically, using an independent block. Optimization of the hyper-parameters using hold-out validation was required to ensure the best results. To evaluate the performance of our system, we calculated the similarity error, precision accuracy, and calculation time. The results obtained over our database showed clearly that the system provided a very good result with an average accuracy of 99.7997%, with an overall average calculation time of 0.01295 s. The composite based on polycarbonate−5 wt.% carbon nanotube was found to be the ultimate absorber over microwave range according to Rozanov formalism.

Distinctive electron transport on pyridine-linked molecular junctions with narrow monolayer graphene nanoribbon electrodes compared with metal electrodes and graphene electrodes

2016 ◽  
Vol 18 (40) ◽  
pp. 28217-28226 ◽  
Author(s):  
Jie Li ◽  
Tao Li ◽  
Yi Zhou ◽  
Weikang Wu ◽  
Leining Zhang ◽  
...  
Keyword(s):  
Electron Transport ◽  
Electronic Devices ◽  
Graphene Nanoribbon ◽  
Molecular Junctions ◽  
Molecular Devices ◽  
Monolayer Graphene ◽  
Organic Electronic Devices ◽  
Metal Electrodes ◽  
Organic Electronic

The electrodes in the molecular devices are essential for creating functional organic electronic devices.

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