1,721,964 research outputs found
An elastoplastic model approach for the relaxation dynamics of active glasses
No full textSchematic of the coarse-graining process: the left figure depicts self-propelled particles, with arrows indicating their active forces. The right figure shows the coarse-grained system, where arrows represent the average active force per block.How activity affects the glassy dynamics is crucial for several biological processes. Furthermore, active glasses offer fascinating phenomenologies, extend the scope of equilibrium glass-forming liquids, and can provide novel insights into the original problem. We introduce a family of novel approaches to investigating the relaxation dynamics of active glasses via an active elastoplastic model (EPM). These approaches describe the relaxation dynamics via local plastic yielding and can provide improved insights as we can study various aspects of the system separately. Activity enters the model via three crucial features: activity-mediated plastic yielding, activated barrier crossing, and persistent rotational dynamics of the yielding direction. We first consider a minimal active EPM that adds the effect of active yielding to a thermal EPM. We show that this active EPM captures the known results of active glasses within a reasonable parameter space. The results also agree well with the analytical results for active glasses when activity is small. The minimal model breaks down at very low temperatures where other effects become important. Looking at the broader model class, we demonstrate that whereas active yielding primarily dominates the relaxation dynamics, the persistence of the yielding direction governs the dynamic heterogeneity in active glasses.Schematic of the coarse-graining process: the left figure depicts self-propelled particles, with arrows indicating their active forces. The right figure shows the coarse-grained system, where arrows represent the average active force per block.How activity affects the glassy dynamics is crucial for several biological processes. Furthermore, active glasses offer fascinating phenomenologies, extend the scope of equilibrium glass-forming liquids, and can provide novel insights into the original problem. We introduce a family of novel approaches to investigating the relaxation dynamics of active glasses via an active elastoplastic model (EPM). These approaches describe the relaxation dynamics via local plastic yielding and can provide improved insights as we can study various aspects of the system separately. Activity enters the model via three crucial features: activity-mediated plastic yielding, activated barrier crossing, and persistent rotational dynamics of the yielding direction. We first consider a minimal active EPM that adds the effect of active yielding to a thermal EPM. We show that this active EPM captures the known results of active glasses within a reasonable parameter space. The results also agree well with the analytical results for active glasses when activity is small. The minimal model breaks down at very low temperatures where other effects become important. Looking at the broader model class, we demonstrate that whereas active yielding primarily dominates the relaxation dynamics, the persistence of the yielding direction governs the dynamic heterogeneity in active glasses.Department of Atomic Energy, Government of India https://doi.org/10.13039/501100001502Erwin Schrödinger International Institute for Mathematics and Physics https://doi.org/10.13039/501100003066Science and Engineering Research Board https://doi.org/10.13039/50110000184
Amidinato silylene-based inorganic aromatic rings
No full textAromaticity is a key concept that applies to organic as well as inorganic chemistry and it finds a huge role in chemical reactivity and stability. Herein, we present a series of aromatic rings prepared from amidinato silylene.Aromaticity is a key concept that underpins the behavior and applications of a wide range of chemical compounds. Its impact on stability, reactivity, biological functions, material properties, and environmental persistence underscores the importance of understanding and harnessing aromaticity in chemistry and materials sciences. We have been pioneers in the field of silylene chemistry and recently, our silylene molecules have been used to synthesize several inorganic aromatic ring compounds. Aromaticity in inorganic compounds is not commonly observed; hence, inorganic aromatic rings derived from silylene would further enhance our understanding of aromaticity and stability. Herein, we discuss the inorganic aromatic rings which have been synthesized from amidinato silylene.Aromaticity is a key concept that applies to organic as well as inorganic chemistry and it finds a huge role in chemical reactivity and stability. Herein, we present a series of aromatic rings prepared from amidinato silylene.Aromaticity is a key concept that underpins the behavior and applications of a wide range of chemical compounds. Its impact on stability, reactivity, biological functions, material properties, and environmental persistence underscores the importance of understanding and harnessing aromaticity in chemistry and materials sciences. We have been pioneers in the field of silylene chemistry and recently, our silylene molecules have been used to synthesize several inorganic aromatic ring compounds. Aromaticity in inorganic compounds is not commonly observed; hence, inorganic aromatic rings derived from silylene would further enhance our understanding of aromaticity and stability. Herein, we discuss the inorganic aromatic rings which have been synthesized from amidinato silylene
sj-docx-2-pie-10.1177_09544089221078137 - Supplemental material for Experimental investigation into machinability of hardened AISI D6 steel using newly developed AlTiSiN coated carbide tools under sustainable finish dry hard turning
No full textSupplemental material, sj-docx-2-pie-10.1177_09544089221078137 for Experimental investigation into machinability of hardened AISI D6 steel using newly developed AlTiSiN coated carbide tools under sustainable finish dry hard turning by Anshuman Das, Sudhansu Ranjan Das, Asutosh Panda and Saroj Kumar Patel in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
sj-docx-1-pie-10.1177_09544089221078137 - Supplemental material for Experimental investigation into machinability of hardened AISI D6 steel using newly developed AlTiSiN coated carbide tools under sustainable finish dry hard turning
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089221078137 for Experimental investigation into machinability of hardened AISI D6 steel using newly developed AlTiSiN coated carbide tools under sustainable finish dry hard turning by Anshuman Das, Sudhansu Ranjan Das, Asutosh Panda and Saroj Kumar Patel in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
sj-docx-1-pie-10.1177_09544089221110430 - Supplemental material for Comparative performance evaluation between uncoated and TiAlN + AlCrN coated carbide tools in hard turning of AISI H11 steel
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089221110430 for Comparative performance evaluation between uncoated and TiAlN + AlCrN coated carbide tools in hard turning of AISI H11 steel by Anshuman Das, Apoorv Gautam, Asutosh Panda, Sudhansu Ranjan Das, Kishore Debnath, Ch. Ramakrishna and Saroj Kumar Patel in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
sj-docx-2-pie-10.1177_09544089231223021 - Supplemental material for Comparative performance evaluation between ta-C and TiAlCrN coated tools during milling of additively manufactured CFRP composite
No full textSupplemental material, sj-docx-2-pie-10.1177_09544089231223021 for Comparative performance evaluation between ta-C and TiAlCrN coated tools during milling of additively manufactured CFRP composite by Anshuman Das, Dineshwar Barrenkala, Sudhansu Ranjan Das, Saroj Kumar Patel, Nalin Somani and Ch Sateesh Kumar in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
sj-docx-2-pie-10.1177_09544089221110430 - Supplemental material for Comparative performance evaluation between uncoated and TiAlN + AlCrN coated carbide tools in hard turning of AISI H11 steel
No full textSupplemental material, sj-docx-2-pie-10.1177_09544089221110430 for Comparative performance evaluation between uncoated and TiAlN + AlCrN coated carbide tools in hard turning of AISI H11 steel by Anshuman Das, Apoorv Gautam, Asutosh Panda, Sudhansu Ranjan Das, Kishore Debnath, Ch. Ramakrishna and Saroj Kumar Patel in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
Scaling the glassy dynamics of active particles: Tunable fragility and reentrance
No full textUnderstanding the influence of activity on dense amorphous assemblies is crucial for biological processes such as wound healing, embryogenesis, or cancer progression. Here, we study the effect of self-propulsion forces of amplitude [Formula: see text] and persistence time [Formula: see text] in dense assemblies of soft repulsive particles by simulating a model particle system that interpolates between particulate active matter and biological tissues. We identify the fluid and glass phases of the three-dimensional phase diagram obtained by varying [Formula: see text], [Formula: see text], and the packing fraction [Formula: see text]. The morphology of the phase diagram accounts for a nonmonotonic evolution of the relaxation time with [Formula: see text], which is a direct consequence of the crossover in the dominant relaxation mechanism, from glassy to jamming. A second major consequence is the evolution of the glassy dynamics from sub-Arrhenius to super-Arrhenius. We show that this tunable glass fragility extends to active systems analogous observations reported for passive particles. This analogy allows us to apply a dynamic scaling analysis proposed for the passive case, in order to account for our results for active systems. Finally, we discuss similarities and differences between our results and recent findings in the context of computational models of biological tissues
sj-docx-1-pie-10.1177_09544089231223021 - Supplemental material for Comparative performance evaluation between ta-C and TiAlCrN coated tools during milling of additively manufactured CFRP composite
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089231223021 for Comparative performance evaluation between ta-C and TiAlCrN coated tools during milling of additively manufactured CFRP composite by Anshuman Das, Dineshwar Barrenkala, Sudhansu Ranjan Das, Saroj Kumar Patel, Nalin Somani and Ch Sateesh Kumar in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
The random first-order transition theory of active glass in the high-activity regime
No full textAbstractDense active matter, in the fluid or amorphous-solid form, has generated intense interest as a model for the dynamics inside living cells and multicellular systems. An extension of the random first-order transition theory (RFOT) to include activity was developed, whereby the activity of the individual particles was added to the free energy of the system in the form of the potential energy of an active particle, trapped by a harmonic potential that describes the effective confinement by the surrounding medium. This active-RFOT model was shown to successfully account for the dependence of the structural relaxation time in the active glass, extracted from simulations, as a function of the activity parameters: the magnitude of the active force (f
0) and its persistence time (τ
p
). However, significant deviations were found in the limit of large activity (large f
0 and/or τ
p
). Here we extend the active-RFOT model to high activity using an activity-dependent harmonic confining potential, which we solve self-consistently. The extended model predicts qualitative changes in the high activity regime, which agree with the results of simulations in both three-dimensional and two-dimensional models of active glass.Department of Atomic Energy, Government of Indiahttps://doi.org/10.13039/501100001502Marie Sklodowska-Curie Actionshttps://doi.org/10.13039/10001869
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