Inertial effects and long-term transport properties of particle motion in washboard potential

2021 ◽  
pp. 126407
Author(s):  
Claudia Venditti ◽  
Alessandra Adrover ◽  
Massimiliano Giona
Keyword(s):  
Transport Properties ◽  
Particle Motion ◽  
Inertial Effects

Multiple Boris solvers for particle-in-cell (PIC) simulation

2021 ◽  
Author(s):  
Seiji Zenitani ◽  
Tsunehiko Kato
Keyword(s):  
Plasma Physics ◽  
Particle Motion ◽  
Charged Particles ◽  
Single Step ◽  
Pic Simulation ◽  
Particle In Cell ◽  
Step Procedure ◽  
Cell Simulation ◽  
Continuous Demand

<div> <div> <div> <p> Particle-in-cell (PIC) simulation has long been used in theoretical plasma physics. In PIC simulation, the Boris solver is the de-facto standard for solving particle motion, and it has been used over a half century. Meanwhile, there is a continuous demand for better particle solvers. In this contribution, we introduce a family of Boris-type schemes for integrating the motion of charged particles. We call the new solvers the multiple Boris solvers. The new solvers essentially repeat the standard two-step procedure multiple times in the Lorentz-force part, and we derive a single-step form for arbitrary subcycle number <em>n</em>. The new solvers give <em>n<sup>2</sup></em> times smaller errors, allow larger timesteps, but they are computationally affordable for moderate <em>n</em>. The multiple Boris solvers also reduce a numerical error in long-term plasma motion in a relativistic magnetized flow.</p> </div> </div> </div><p>Reference:</p><ul><li>S. Zenitani & T. N. Kato, <em>Multiple Boris integrators for particle-in-cell simulation</em>, Comput. Phys. Commun. <strong>247</strong>, 106954, doi:10.1016/j.cpc.2019.106954 (2020)</li> </ul>

Long-Term Sorption Properties of Mortars Modified by Crystallizing Admixture

2014 ◽  
Vol 1054 ◽  
pp. 71-74 ◽  
Author(s):  
Pavel Reiterman ◽  
Vít Bäumelt
Keyword(s):  
Transport Properties ◽  
Building Materials ◽  
Important Influence ◽  
Sorption Properties ◽  
Experimental Program

Paper is focused on the determination of sorption properties of mortars modified by sealing admixture. Ability of building materials to transport water has an important influence to other properties, predominantly durability. Realized experimental program introduces results of long-term measurements of transport properties presented by capillary absorbability.

scholarly journals Effect of Hygrothermal Aging on Hydrophobic Treatments Applied to Building Exterior Claddings

Coatings ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 363 ◽  
Author(s):  
Giovanni Borsoi ◽  
Carlos Esteves ◽  
Inês Flores-Colen ◽  
Rosário Veiga
Keyword(s):  
Water Absorption ◽  
Transport Properties ◽  
Moisture Transport ◽  
Artificial Aging ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Minimal Impact ◽  
Hydrophobic Materials ◽  
The Aesthetic

Hydrophobic materials are among the most commonly used coatings for building exterior cladding. In fact, these products are easily applied to an existing surface, significantly reduce water absorption and have a minimal impact on the aesthetic properties. On the other hand, although these products have a proven effectiveness, their long-term durability to weathering has not yet been systematically studied and completely understood. For these reasons, this study aims to correlate the effect of artificial aging on the moisture transport properties of hydrophobic treatments when applied on building exterior claddings. Three hydrophobic products (an SiO2-TiO2 nanostructured dispersion; a silane/oligomeric siloxane; and a siloxane) were applied on samples of limestone and of a cement-based mortar. The moisture transport properties (water absorption, drying, water vapor permeability) of untreated and treated specimens were characterized. Furthermore, the long-term durability of the specimens was evaluated by artificial aging, that is, hygrothermal cycles (freeze–thaw and hot–cold). All treatments have significant hydrophobic effectiveness and improve the long term-durability of the treated specimens. However, the results showed that the three hydrophobic products have different effectiveness and durability, with the SiO2-TiO2 nanostructured dispersion being the most durable treatment on limestone, and the siloxane the most suitable for cementitious mortar.

scholarly journals [60]PCBM single crystals: remarkably enhanced band-like charge transport, broadband UV-visible-NIR photo-responsivity and improved long-term air-stability

2018 ◽  
Vol 6 (20) ◽  
pp. 5489-5496 ◽  
Author(s):  
Xiaoming Zhao ◽  
Tianjun Liu ◽  
Xueyan Hou ◽  
Zilu Liu ◽  
Wenda Shi ◽  
...  
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Single Crystals ◽  
Uv Visible

[60]PCBM single crystals were prepared to understand their intrinsic photo-responsivity, stability, and charge transport properties.

Effect of curing regime on long-term mechanical strength and transport properties of steam-cured concrete

2020 ◽  
Vol 255 ◽  
pp. 119407 ◽  
Author(s):  
Jinyan Shi ◽  
Baoju Liu ◽  
Shuai Shen ◽  
Jinxia Tan ◽  
Jingdan Dai ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Transport Properties ◽  
Curing Regime

scholarly journals Phase Stability and Transport Properties of (ZrO2)0.91−x(Sc2O3)0.09(Yb2O3)x Crystals (x = 0–0.01)

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 83
Author(s):  
Mikhail Borik ◽  
Galina Korableva ◽  
Alexey Kulebyakin ◽  
Irina Kuritsyna ◽  
Nataliya Larina ◽  
...  
Keyword(s):  
High Temperature ◽  
Transport Properties ◽  
Phase Stability ◽  
Rf Heating ◽  
X Ray Diffraction ◽  
High Temperature Heat Treatment ◽  
Before And After ◽  
T Phase ◽  
High Phase

Phase stability and transport properties of (ZrO2)0.91−x(Sc2O3)0.09(Yb2O3)x crystals (x = 0–0.01) have been studied before and after air annealing at 1000 °C for 400 h. The crystals have been grown by radio frequency (RF) heating in a cold crucible. The microstructure, phase composition, and electrical conductivity of the crystals have been studied using optical microscopy, X-ray diffraction, Raman spectroscopy, and impedance spectroscopy. Phase stability and degradation of ionic conductivity of the crystals upon long-term high-temperature heat treatment have been discussed. We show that the stabilization of ZrO2 co-doped with 9 mol.% Sc2O3 and 1 mol.% Yb2O3 provides transparent uniform crystals with the pseudocubic t″ phase structure having high phase stability. Crystals of this composition had the highest conductivity in the entire temperature range. Long-term high-temperature annealing of these crystals did not lead to conductivity degradation.

Medium to Long Term Engineering Properties and Performance of High-Strength Geopolymers for Structural Applications

2010 ◽  
Vol 69 ◽  
pp. 135-142 ◽  
Author(s):  
Kwesi Sagoe–Crentsil ◽  
Trevor Brown ◽  
Shi Qin Yan
Keyword(s):  
Transport Properties ◽  
Permeability Coefficient ◽  
Gas Permeability ◽  
High Strength ◽  
Engineering Properties ◽  
Chloride Diffusion ◽  
Geopolymer Concrete ◽  
Structural Applications ◽  
Durability Performance

The medium to long term engineering performance of high-strength geopolymer concrete systems are largely dependent on fluid ingress and the transport phenomena that govern permeability of structural members exposed to aggressive environments. For the purpose of analysing durability performance, both high pressure water and gas permeability testing of fly-ash geopolymer(GP) concretes have been assessed for samples cured under ambient and steam exposure conditions at 65OC. The observed mean permeability coefficient values for gas(k) and water(Kw) of steam-cured structural grade concrete was respectively 6.19E-17m2 at 300kPa gas pressure and 1.52E-10m/s at 525kPa water pressure. While mean gas permeability values were comparable to reference steam-cured ordinary Portland cement(OPC) systems, the corresponding water permeability coefficient data for geopolymer concrete was ten-fold higher. The transport properties of OPC concrete systems are typically governed by water-to-cement ratio and the degree of hydration which is linked to the level of porosity and pore interconnectivity. However, corresponding permeability of geopolymer concrete appears to be dictated by an inherent mesoporous capillary pore network structure for which transport properties appear to be partly dependent on mode of concrete curing. The Paper examines global implications of increased permeability and key durability parameters such as chloride diffusion, carbonation rates and steel reinforcement corrosion on long-term engineering and durability performance.

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