22 JAN 2020
08:00 - 10:30

Venue:

Opposite the ARAJ, Artesh Highway, Tehran, Iran
School of Cognitive Sciences, Institute for Research in Fundamental Sciences (IPM),



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22 JAN 2020
14:00 - 15:00

Seminar Room (classroom A), Farmanieh Building, IPM

Organized by: School of Nano Science

22 JAN 2020
14:00 - 15:00

Metal-based Nanocomposites: Plasticity and Tribological Behavior Analyzed by Atomistic Simulations

Abstract:

In the last two decades, emergence and development of different nano-scaled synthesis and characterization methods for metal matrix nanocomposites (MMNCs) have made them the center of academic and industrial communities’ focus owing to their excellent physical and mechanical properties. Accordingly, deformation mechanism of these nanocomposites should be deeply addressed in the presence of nanofillers of different sizes and distribution. Although failure of NCs is a macroscopic phenomenon, this is resulted by the atomic-scale structural variations of the sample. Therefore, for closer study of the failure mechanism of these NCs considering the structural changes during their deformation, different atomistic-based approaches can be utilized. Among them, molecular dynamics simulation is the most applicable one as discussed in this talk. In the first part of this presentation, employing the results of several case studies, the influence of
surface and volumetric porosities on the plastic deformation of MMNCs is examined. The underlying mechanism governing this behavior is also discussed through microstructural characterization provided by the means of dislocation extraction analysis. This is followed by inspection of the temperature role on the plastic deformation of these NCs. At the second part, I will utilize MD simulation of the nanoscratching process to explore the dominant factors influencing the nanotribological characteristics of metal matrices in the presence of graphene
sheets and silicon carbide nanofillers.

22 JAN 2020
15:00 - 16:00

Abstract: Heavy quark parton distribution functions (PDFs) play an important role in several Standard Model and New Physics processes. Most analyses rely on the assumption that the charm and bottom PDFs are generated perturbatively by gluon splitting and do not involve any non-perturbative degrees of freedom. The existence of a nonperturbative intrinsic heavy quark component in the nucleon is clearly necessary to test this hypothesis with suitable QCD processes.
The xFitter package as an open-source package provided a framework for QCD analyses related to proton and nucleon structure in the context of multi-processes and multi-experiments. The framework includes modules or interfaces enabling a large number of theoretical and methodological options, as well as a large number of relevant data sets from HERA, Tevatron, and LHC.

In this talk, we focus on the role and importance of xFitter to investigate the new physics on future colliders.


Larak Seminar Room

19 FEB 2020
-

Farmanieh Conference Hall