Accurate and Efficient Algorithm for Computing Structure Functions From the Spatial Distribution of Thermal Properties in Electronic Devices

2021 ◽  
pp. 1-8
Author(s):  
Lorenzo Codecasa ◽  
Vincenzo d'Alessandro ◽  
Antonio Pio Catalano ◽  
Ciro Scognamillo ◽  
Dario D'Amore ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Thermal Properties ◽  
Efficient Algorithm ◽  
Electronic Devices ◽  
Structure Functions ◽  
Computing Structure

scholarly journals 3D Porous Graphene Based Aerogel for Electromagnetic Applications

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hossein Cheraghi Bidsorkhi ◽  
Alessandro Giuseppe D’Aloia ◽  
Alessio Tamburrano ◽  
Giovanni De Bellis ◽  
Andrea Delfini ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Vinylidene Fluoride ◽  
Mechanical Stability ◽  
Electronic Devices ◽  
Cost Effective ◽  
Water Repellent ◽  
Processing Temperature ◽  
Porous Graphene ◽  
Poly Vinylidene Fluoride ◽  
Selection Of

Abstract Lightweight multifunctional electromagnetic (EM) absorbing materials with outstanding thermal properties, chemical resistance and mechanical stability are crucial for space, aerospace and electronic devices and packaging. Therefore, 3D porous graphene aerogels are attracting ever growing interest. In this paper we present a cost effective lightweight 3D porous graphene-based aerogel for EM wave absorption, constituted by a poly vinylidene fluoride (PVDF) polymer matrix filled with graphene nanoplatelets (GNPs) and we show that the thermal, electrical, mechanical properties of the aerogel can be tuned through the proper selection of the processing temperature, controlled either at 65 °C or 85 °C. The produced GNP-filled aerogels are characterized by exceptional EM properties, allowing the production of absorbers with 9.2 GHz and 6.4 GHz qualified bandwidths with reflection coefficients below −10 dB and −20 dB, respectively. Moreover, such aerogels show exceptional thermal conductivities without any appreciable volume change after temperature variations. Finally, depending on the process parameters, it is shown the possibility to obtain water repellent aerogel composites, thus preventing their EM and thermal properties from being affected by environmental humidity and allowing the realization of EM absorber with a stable response.

scholarly journals 67P/Churyumov–Gerasimenko’s dust activity from pre- to post-perihelion as detected by Rosetta/GIADA

2020 ◽  
Vol 496 (1) ◽  
pp. 125-137
Author(s):  
A Longobardo ◽  
V Della Corte ◽  
A Rotundi ◽  
M Fulle ◽  
G Rinaldi ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Thermal Properties ◽  
Dust Particle ◽  
Particle Velocity ◽  
Particle Concentration ◽  
Dust Particles ◽  
Data Set ◽  
Trace Back ◽  
Dust Distribution ◽  
Cometary Activity

ABSTRACT We characterized the 67P/Churyumov–Gerasimenko’s dust activity, by analysing individual dust particle velocity and momentum measurements of Grain Impact Analyser and Dust Accumulator (GIADA), the dust detector onboard the ESA/Rosetta spacecraft, collecting dust from tens to hundreds of kilometres from the nucleus. Specifically, we developed a procedure to trace back the motion of dust particles down to the nucleus, identifying the surface’s region ejecting each dust particle. This procedure has been developed and validated for the first part of the mission by Longobardo et al. and was extended to the entire GIADA data set in this work. The results based on this technique allowed us to investigate the link between the dust porosity (fluffy/compact) and the morphology of the ejecting surface (rough/smooth). We found that fluffy and compact particles, despite the lack of correlation in their coma spatial distribution (at large nucleocentric distances) induced by their different velocities, have common ejection regions. In particular, the correlation between the distributions of fluffy and compact particles is maintained up to an altitude of about 10 km. Fluffy particles are more abundant in rough terrains. This could be the result of past cometary activity that resurfaced the smooth terrains and/or of the comet formation process that stored the fluffy particles inside the voids between the pebbles. The variation of fluffy particle concentration between rough and smooth terrains agrees with predictions of comet formation models. Finally, no correlation between dust distribution on the nucleus and surface thermal properties was found.

Change in Spatial Distribution of State Densities of Carbon Nanotubes Under Anisotropic Strain Field

2014 ◽  
Author(s):  
Masato Ohnishi ◽  
Yang Meng ◽  
Ken Suzuki ◽  
Hideo Miura
Keyword(s):  
Carbon Nanotubes ◽  
Spatial Distribution ◽  
High Performance ◽  
Thermal Deformation ◽  
State Energy ◽  
Lattice Mismatch ◽  
Electronic Devices ◽  
Radial Strain ◽  
First Principles Calculation ◽  
State Densities

In any electronic devices and sensors, unexpected changes in their function occur due to internal strain caused by contact of different materials which leads to thermal deformation or lattice mismatch. Thus, understanding of the effect of strain on electronic properties of carbon nanotubes (CNTs) is indispensable for assuring the reliability of CNTs-based electronic devices and for developing new electronic devices and sensors. In this study, the change in spatial distribution of state densities of zigzag CNTs under radial strain is analyzed by using first-principles calculation. The analysis shows that when a radial strain is applied to a CNT, its state densities are localized at high curvature regions. Such localization of state densities decrease their energies, and then decrease the band gap. In addition, since the behavior of the state energy under the radial strain is dominated by its spatial distribution, the strain sensitivity of CNTs depends on their chirality. The founding gives a guideline on how to fabricate high-performance novel CNTs devices, sensors, for example, biaxial strain sensor.

scholarly journals Energetic and thermal properties of tilt grain boundaries in graphene/hexagonal boron nitride heterostructures

2015 ◽  
Vol 08 (03) ◽  
pp. 1550038 ◽  
Author(s):  
Mingchao Wang ◽  
Guangping Zhang ◽  
Huisheng Peng ◽  
Cheng Yan
Keyword(s):  
Thermal Properties ◽  
Boron Nitride ◽  
Grain Boundaries ◽  
Hexagonal Boron Nitride ◽  
Electronic Devices ◽  
Thermal Conductance ◽  
Interfacial Thermal Conductance ◽  
Non Equilibrium Molecular Dynamics ◽  
Dynamics Simulations ◽  
Misorientation Angles

Graphene/hexagonal boron nitride (G/h-BN) heterostructure has attracted tremendous research efforts owing to its great potential for applications in nanoscale electronic devices. In such hybrid materials, tilt grain boundaries (GBs) between graphene and h-BN grains may have unique physical properties, which have not been well understood. Here we have conducted non-equilibrium molecular dynamics simulations to study the energetic and thermal properties of tilt GBs in G/h-BN heterostructures. The effect of misorientation angles of tilt GBs on both GB energy and interfacial thermal conductance are investigated.

A review of the superconducting and normal state properties of Y1−xPrxBa2Cu3O7

1992 ◽  
Vol 7 (7) ◽  
pp. 1917-1955 ◽  
Author(s):  
H.B. Radousky
Keyword(s):  
Thermal Properties ◽  
Normal State ◽  
Electronic Devices ◽  
Pair Breaking ◽  
Hole Filling ◽  
Normal State Properties ◽  
Magnetic Pair

The properties of the Y1−xPrxBa2Cu3O7(YPrBCO) system are reviewed. These include superconducting, normal state, structural, chemical, optical, magnetic, and thermal properties. The destruction of superconductivity with Pr doping is discussed in view of possible models such as hole filling, localization, magnetic pair-breaking, and the role of hybridization. Applications to electronic devices using YBCO/PrBCO/YBCO multilayers are also reviewed.

A CONTRACTION ALGORITHM FOR FINDING ALL THE DC SOLUTIONS OF PIECEWISE-LINEAR CIRCUITS

1994 ◽  
Vol 04 (03) ◽  
pp. 319-336 ◽  
Author(s):  
MICHAL TADEUSIEWICZ ◽  
KRZYSZTOF GŁOWIENKA
Keyword(s):  
Rate Of Convergence ◽  
Efficient Algorithm ◽  
Broad Class ◽  
Piecewise Linear ◽  
Electronic Devices ◽  
High Rate ◽  
Numerical Examples ◽  
Computation Process ◽  
Linear Circuits ◽  
Successive Division

An efficient algorithm for finding all the DC solutions of a broad class of piecewise-linear circuits, having hybrid representation, is described in this paper. Circuits belonging to this class can include electronic devices modelled by linear resistors, linear controlled sources, piecewise-linear two terminal resistors and independent sources. The algorithm is based on the idea of successive division and contraction of the solution domain. Two contraction methods are developed that result in a high rate of convergence of the computation process. Numerical examples and comparison analyses show the efficiency of this algorithm.

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