2 DEC 2021
11:00 - 13:00

My talk is based on concerning to the question raised by Grothendieck on the (non)vanishing of local cohomology modules in his seminar at Harvard in 1961. One may consider the mentioned question from the (non)vanishing of their annihilators point of the view. To be more precise, this is a report on the recent developments of the (non)vanishing of the annihilators of local cohomology modules with some new open questions.

https://zoom.us/join
Meeting ID: 908 611 6889
Passcode: 362880

1 DEC 2021
16:30 - 18:30

I will concentrate on the ideal theory of models of Peano Arithmetic and some of its weak fragments. I will present a model theoretic analysis of the residue rings of these structures.

https://us02web.zoom.us/j/88308749358?pwd=MzFWamxoVGtYYjVBVjgrR2ZqWkdwQT09
Meeting ID: 883 0874 9358
Passcode: 168761

1 DEC 2021
13:00 - 14:00

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Link: https://us06web.zoom.us/j/86917547255


Meeting ID: 869 1754 7255

1 DEC 2021
13:30 - 15:00

Orbital distribution of over 4000 confirmed exoplanets indicates a population of super-Earth planets close to their host stars. If an inward disc-driven migration scenario is assumed for their formation, these planets could have been stopped and parked at an inner edge of the disc, or be pushed through the inner disc cavity by a resonant chain. This topic has not been properly and extensively studied. In this talk, I will briefly explain how we investigate this topic using hydrodynamical simulations, under what condition the planets can get close to their parent stars, and one possible missing piece in the theory of planetary migration.

1 DEC 2021
11:00 - 12:00

Abstract: The Iranian Light Source Facility (ILSF) is a 3 GeV synchrotron radiation laboratory which is in the detailed design stage, and the main building site is being excavated in Qazvin, 150 km from Tehran. The ILSF storage ring (SR) is based on a Five-Bend Achromat (5BA) lattice providing an ultra-low beam emittance of 270 pm rad. The ring is comprised of 100 combined dipole magnets, 240 quadrupoles, and 320 sextupoles with additional coils as dipole and skew quadrupole correctors. In this webinar, some design features of the SR magnets, along with their detailed physical design, are debated. The corresponding electrical and cooling calculations and mechanical layouts are investigated as well.
Magnetic cross-talk due to the small free space between the magnets of a machine may result in significant distortions of the magnetic field integration and performance distortion of the machine. This webinar also presents the preparation done at ILSF on integrated magnetic components of three storage ring (SR) magnets with minimum space between the yokes, modeled separately in Opera-3D code and accumulatively as in the lattice design. The probable deviation on the higher-order integrated multipoles together with harmonic fields along the beam trajectory are discussed, and some studies are introduced to cut down any deficient effects.


Meeting Link
Indico: https://indico.particles.ipm.ir/indico/event/447
https://meet.google.com/kom-fvsj-qzw

1 DEC 2021
14:00 - 15:00

Artificial systems capable of self-sustained movement with self-sufficient energy are of high interest with respect to the development of many challenging applications, including medical treatments, but also technical applications. The bottom-up assembly of such systems in the context of synthetic biology is still a challenging task. In this work, we demonstrate the biocompatibility and efficiency of an artificial light-driven energy module and a motility functional unit by integrating light-switchable photo-synthetic vesicles with demembranated flagella. The flagellar propulsion is coupled to the beating frequency, and dynamic ATP synthesis in response to illumination allows us to control beating frequency of flagella in a light-dependent manner. In addition, we verified the functionality of light-powered synthetic vesicles in in vitro motility assays by encapsulating microtubules assembled with force-generating kinesin-1 motors and the energy module to investigate the dynamics of a
contractile filamentous network in cell-like compartments by optical stimulation. Integration of this photosynthetic system with various biological building blocks such as cytoskeletal filaments and molecular motors may contribute to the bottom-up synthesis of artificial cells that are able to undergo motor-driven morphological deformations and exhibit directional motion in a light-controllable fashion.


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https://www.skyroom.online/ch/schoolofnanoscience/weeklyseminars