Structural breakdown in electrically stressed diodes

Scilight ◽  
2020 ◽  
Vol 2020 (40) ◽  
pp. 401101
Author(s):  
Raima Larter
Keyword(s):  
Structural Breakdown

scholarly journals Single-walled carbon nanotubes as stabilizing agents in red phosphorus Li-ion battery anodes

RSC Advances ◽  
2017 ◽  
Vol 7 (63) ◽  
pp. 39997-40004 ◽  
Author(s):  
Jasmin Smajic ◽  
Amira Alazmi ◽  
Shashikant P. Patole ◽  
Pedro M. F. J. Costa
Keyword(s):  
Carbon Nanotubes ◽  
Lithium Ion ◽  
Single Walled Carbon Nanotubes ◽  
Red Phosphorus ◽  
Stabilizing Agents ◽  
Single Walled Carbon ◽  
Capacity Loss ◽  
Structural Breakdown ◽  
Li Ion ◽  
Walled Carbon Nanotubes

Structural breakdown and capacity loss of a red phosphorus-based anode material for lithium-ion batteries have been considerably attenuated with the addition of single-walled carbon nanotubes.

Post-Peak Behaviour of Sensitive Clays in Undrained Shear

1968 ◽  
Vol 5 (2) ◽  
pp. 59-68 ◽  
Author(s):  
B Ladanyi ◽  
J P Morin ◽  
C Pelchat
Keyword(s):  
Shear Strength ◽  
Indirect Method ◽  
Peak Stress ◽  
Large Strains ◽  
Peak Strain ◽  
Stress Strain ◽  
Strain Behaviour ◽  
Structural Breakdown ◽  
Undrained Shear

The post-peak stress-strain behaviour in undrained shear of three different clays has been investigated by using an indirect method. This method, which is in principle similar to that used by Kallstenius (1963), consists in first compressing a clay specimen to a given post-peak strain between two parallel platens and subsequently determining its current remoulded strength by the laboratory vane method. By a repeated compression procedure, axial strains of up to 200 per cent have been attained. As the three clays tested differed widely in sensitivity, a comparison of their post-peak behaviour made clearly apparent the effect of structural breakdown on the reserve shear strength at large strains.

The Simulation of Aggregated Colloids Under Flow

1992 ◽  
Vol 289 ◽  
Author(s):  
John R. Melrose
Keyword(s):  
Shear Rate ◽  
Large Scale ◽  
Shear Thinning ◽  
High Shear ◽  
Shear Rates ◽  
Rouse Model ◽  
High Shear Rates ◽  
Structural Breakdown ◽  
Large Scale Simulations ◽  
Low Shear

AbstractAn overview is given of theories of aggregates under flow. These generally assume some sort of structural breakdown as the shear rate is increased. Models vary with both the rigidity of the bonding and the level of treatment of hydrodynamics. Results are presented for simulations of a Rouse model of non-rigid, (i.e. central force) weakly bonded aggregates. In large scale simulations different structures are observed at low and high shear rates. The change from one structure to another is associated with a change in the rate of shear thinning. The model captures low shear rate features of real systems absent in previous models: this feature is ascribed to agglomerate deformations. Quantitatively, the model is two orders of magnitude out from experiment but some scaling is possible.

Fatty acid bioaccessibility and structural breakdown from in vitro digestion of almond particles

2019 ◽  
Vol 10 (8) ◽  
pp. 5174-5187 ◽  
Author(s):  
Clay Swackhamer ◽  
Zhichao Zhang ◽  
Ameer Y. Taha ◽  
Gail M. Bornhorst
Keyword(s):  
Particle Size ◽  
Fatty Acid ◽  
In Vitro Digestion ◽  
Size Reduction ◽  
Gastric Digestion ◽  
Particle Size Reduction ◽  
Structural Breakdown ◽  
Peristaltic Contractions

In vitro gastric digestion of almond particles using a model with simulated peristaltic contractions resulted in particle size reduction and higher fatty acid bioaccessibility than in vitro digestion using a model that lacked peristaltic contractions.

scholarly journals Structural breakdown in high power GaN-on-GaN p-n diode devices stressed to failure

2020 ◽  
Vol 38 (6) ◽  
pp. 063402
Author(s):  
Prudhvi Peri ◽  
Kai Fu ◽  
Houqiang Fu ◽  
Yuji Zhao ◽  
David J. Smith
Keyword(s):  
High Power ◽  
Structural Breakdown

A Mössbauer study of thermal decomposition of biotites

1975 ◽  
Vol 40 (309) ◽  
pp. 79-88 ◽  
Author(s):  
C. S. Hogg ◽  
R. E. Meads
Keyword(s):  
Heat Treatment ◽  
Thermal Decomposition ◽  
Hydroxyl Group ◽  
Mössbauer Study ◽  
Octahedral Sites ◽  
M6ssbauer Effect ◽  
Thermogravimetric Data ◽  
Infra Red ◽  
Structural Breakdown ◽  
Good Agreement

SummaryThe effect of heat treatment in air at temperatures from 200°C to 1000°C of two Cornish biotites has been studied using the M6ssbauer effect in 57Fe. One of the micas was also studied after heating in vacuo.Progressive changes in the Mössbauer spectra of the materials after heat treatment can be correlated with the following processes: Oxidation of Fe2+ ions in isolated octahedral sites to give Fe3+ in the co-ordination Fe3+(OsOH); oxidation of Fe2+ ions in adjacent a-octahedral (cis OH−) sites to give Fe3+(O6); and oxidation of Fe z+ in adjacent a and b (trans OH−) sites to give either Fe3+(O5OH) or Fe3+(O6) depending on whether a shared hydroxyl group remains intact or otherwise (these processes occur at temperatures below 500°C Also, at higher temperatures, dehydroxylation of Fe3+(O5OH) to give more Fe3+ in the Fe3+(O6) configuration. Finally, in the temperature range 900 to 1000°C structural breakdown yielding α-Fe2O3 as the iron-containing phase.The results and interpretation are in good agreement with thermogravimetric data and with a previous infra-red study. The mechanism of charge diffusion in the lattice during oxidation is discussed in the light of the results.

Clay Layer Fabric and Oedometer Consolidation of a Soft Varved Clay

1972 ◽  
Vol 9 (2) ◽  
pp. 165-175 ◽  
Author(s):  
R. M. Quigley ◽  
T. A. Ogunbadejo
Keyword(s):  
X Ray Diffraction ◽  
Eastern Canada ◽  
Overburden Pressure ◽  
Critical Range ◽  
Preconsolidation Pressure ◽  
Soil Structures ◽  
Soil Fabric ◽  
Structural Breakdown ◽  
Clay Layers ◽  
Glacial Clays

The oedometer consolidation properties of the clay layers of varved sediments from New Liskeard, Ontario have been presented and interpreted with reference to current ideas on soil fabric, bonding, and environment of deposition. The sensitive, brittle nature of the clays is expressed by Cc values as high as 1.35 and "S" shaped consolidation curves. Preconsolidation above any previous possible overburden pressure is explained by bonding of a net random, flocculated fabric as measured by X-ray diffraction methods. Rates of secondary consolidation up to 4.5%/log cycle at loads close to the preconsolidation pressure reflect structural breakdown of the soil fabric within a very critical range of stress and strain.The flocculated soil structure at New Liskeard is compared with the more parallel fabric of the compositionally similar stratified glacial clays at Welland, Ontario. It is suggested that both deposits developed flocculated soil structures during deposition but that the Welland clays were deposited and loaded more rapidly so that time dependent bonding could not develop to resist compression and retain the open structure as at New Liskeard and most other slowly deposited varved clays in eastern Canada. A literature review is presented in support of these ideas.

Rheological characterization of non-Brownian suspensions based on structure kinetics

2018 ◽  
Vol 30 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Kurian J. Vachaparambil ◽  
Gustaf Mårtensson ◽  
Lars Essén
Keyword(s):  
Rheological Behaviour ◽  
Functional Materials ◽  
Kinetics Model ◽  
Test Fluid ◽  
Solder Paste ◽  
Content Type ◽  
Proposed Model ◽  
Breakdown Rates ◽  
Structural Breakdown ◽  
Parameter Values

Purpose The purpose of the paper is to develop a methodology to characterize the rheological behaviour of macroscopic non-Brownian suspensions, like solder paste, based on microstructural evolution. Design/methodology/approach A structure-based kinetics model, whose parameters are derived analytically based on assumptions valid for any macroscopic suspension, is developed to describe the rheological behaviour of a given fluid. The values of the parameters are then determined based on experiments conducted at a constant shear rate. The parameter values, obtained from the model, are then adjusted using an optimization algorithm using the mean deviation from experiments as the cost function to replicate the measured rheology. A commercially available solder paste is used as the test fluid for the proposed method. Findings The initial parameter values obtained through the analytical model indicates a structural breakdown that is much slower than observations. But optimizing the parameter values, especially the ones associated with the structural breakdown, replicates the thixotropic behaviour of the solder paste reasonably well, but it fails to capture the structure build-up during the three interval thixotropy test. Research limitations/implications The structural kinetics model tends to under-predict the structure build-up rate. Practical implications This study details a more realistic prediction of the rheological behaviour of macroscopic suspensions like solder paste, thermal interface materials and other functional materials. The proposed model can be used to characterize different solder pastes and other functional fluids based on the structure build-up and breakdown rates. The model can also be used as the viscosity definitions in numerical simulations instead of simpler models like Carreau–Yasuda and cross-viscosity models. Originality/value The rheological description of the solder paste is critical in determining its validity for a given application. The methodology described in the paper provides a better description of thixotropy without relying on the existing rheological measurements or the behaviour predicted by a standard power-law model. The proposed model can also provide transient viscosity predictions when shear rates vary in time.

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