IPM Calendar 
Wednesday 8 April 2020   Today  
Events for day: Wednesday 15 January 2020    
           11:00 - 12:00     Computational Nanoscience journal club
Density functional theory based neural network force fields from energy decompositions

School
NANO SCIENCES

Density functional theory based neural network force fields from energy decompositions

Abstract:

In order to develop force fields (FF) for molecular dynamics simulations that retain the accuracy of ab initio density functional theory (DFT), we developed a machine learning protocol based on an energy decomposition scheme that extracts atomic energies from DFT calculations. Our DFT to FF (DFT2FF) approach provides almost hundreds of times more data for the DFT energies, which dramatically improves accuracy with less DFT calculations. In addition, we use piecewise cosine basis functions to systematically cons ...

           13:30 - 15:00     Weekly Seminar
Lensing of 21cm Intensity Mapping

School
ASTRONOMY

Future 21cm intensity mapping (IM) surveys will probe high and intermediate redshifts which will give us the opportunity to test theories of gravity in a wider range of distances. In the first part of my talk, I will give a quick summary about the second order lensing of 21cm IM. Similar to the CMB, 21cm IM has no first order lensing contribution but has higher order lensing terms. We studied the second and higher order lensing of 21cm IM (arXiv:1807.01351 ) and observed that the higher order lensing should be taken into account as noise for large scale structure surveys and despite the CMB, post-Born approximation term is important and shou ...

           14:00 - 16:00     Seminar
State-dependent changes in perception and coding in mouse somatosensory cortex

School
COGNITIVE SCIENCES

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




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           14:00 - 15:00     Weekly Seminar
Condensed Matter and Statistical Physics Group
Silicon Diphosphide (SiP2) and Silicon Diarsenide (SiAs2): Novel Stable 2D Semiconductors with High Carrier Mobilities and Promising for Water Splitting Photocatalysts

School
PHYSICS

Seminar Room (classroom A), Farmanieh Building, IPM ...

           14:00 - 15:00     Weekly Seminar
Silicon Diphosphide (SiP2) and Silicon Diarsenide (SiAs2): Novel Stable 2D Semiconductors with High Carrier Mobilities and Promising for Water Splitting Photocatalysts

School
NANO SCIENCES

Silicon Diphosphide (SiP2) and Silicon Diarsenide (SiAs2): Novel Stable 2D Semiconductors with High Carrier Mobilities and Promising for Water Splitting Photocatalysts

Abstract:

Two dimensional (2D) semiconducting light absorbers, have recently considered as promising components to improve the efficiency in the photocatalytic hydrogen production via water splitting. In this work, by employing density functional theory computations, we introduced novel SiX2 (X = P, As) nanosheets in tetragonal (penta-) and orthorhombic (rec-) phases, as promising light absorber semiconductors for overall water splitting. The ...

           15:00 - 16:00     Weekly Seminar
IPM linear accelerator laboratory; report on activities and latest experimental results

School
PARTICLES AND ACCELERATORS

Abstract: Electron linear accelerators are known as the most numerous and the most useful accelerators in the word. The IPM linear accelerator laboratory is responsible to develop the domestic technology in this field. This mission is followed by constructing a linear accelerator based on the available technologies in Iran; hence, nearly all components of this machine are designed and constructed within the country. These components include the RF power source, RF cavities, magnets, and beam diagnostics instruments. The construction of the linac has been finished and we are in the commissioning stage. In this talk some recent activities and t ...