Agenda

Date

December 02-03, 2019

Location

Berlin City, Germany

Conference Agenda

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Keynote Session:

Meetings International -  Conference Keynote Speaker G. Gouesbet photo

G. Gouesbet

Normandie University, France

Title: Generalized Lorenz-Mie theories and mechanical effects of laser light, a celebration of Arthur Ashkin’spioneering work in optical levitation and manipulation.

Biography:

G. Gouesbet  has  been working in light scattering, modeling of two-phase flows, non linear dynamics and chaos theory., and is the promoter of the well-known generalized Lorenz-Mie theory. He authored about 350 papers in journals and as a whole about 550 papers in journals and proceedings. His citation count in Google scholar is about 13 000 with a h-index of 58. He has been serving in numerous committees and is a honorary editor of Journal of Quantitative Spectroscopy and Radiative Transfer.

Abstract:

The generalized Lorenz-Mie theory (GLMT, more generally GLMTs) [1] has been initially developed to address issues in optical particle characterization, more particularly in optical particle sizing, in order to simultaneously measure velocities and sizes of individual particles embedded in flows, with applications to spray combustion or plasma spraying, among others. This line of research, however, had two opportunities to meet another line of research, namely the one of Arthur Ashkin dealing with optical levitation, trapping and manipulation of macroscopic particles (such as droplets or beads), and who won a Nobel prize in physics last year. The first opportunity has been that GLMT (more generally GLMTs) is able to deal with mechanical effects of light whatever the size of particles and then indeed bridged the gap between the Rayleigh and ray optics regimes to which the theoretical part of the work of Arthur Ashkin was limited. The second opportunity has been that optical levitation experiments promoted by Arthur Ashkin have been used to experimentally test the validity of the GLMT. In this talk, as a celebration of Arthur Ashlin’s pioneering work concerning the mechanical effects of laser light, I shall offer a review and overview devoted to GLMTs and mechanical effects of laser light, both in Rouen where the GLMT has been built, and all over the world.

 

Meetings International -  Conference Keynote Speaker Hakima Mokrane photo

Hakima Mokrane

Expaceo, France.

Title: AI in Physics

Biography:

Hakima Mokrane is a researcher in laboratory astrophysics & astrochemistry and now a researcher scientist in machine learning, she designs algorithms for solving AI problems. She graduated from Orsay university with a master (joint Honours) in Physics and Chemistry, before completing her PhD (in molecular physics & laboratory astrophysics) at Paris Observatory and Cergy University. Her interests span "all things ice and molecules", looking at how solid-state materials play a role in the processes of star and planet formation. She combines laboratory experiments with major facilities use, to understand the roll of ice in interstellar chemistry and planet forming collisions and exploit molecular dynamics simulations to understand the physical chemical properties of ice in space and now she is designing and building algorithms to solve AI problems and is interested in the problems of machine learning, deep learning and AI.

 

 

Abstract:

200 different species detected up today in the interstellar and circumstellar media have also been identified in icy environments. The fact that, for most of the species observed so far in the ISM, the most abundant isomer of a given generic chemical formula is the most stable one (MEP) suffers very few exceptions. Two couples of isomers, CH3COOH/HCOOCH3 and CH3CH2OH/CH3OCH3 whose formation is thought to occur on the icy mantles of interstellar grains. Here, we report a coherent and concerted theoretical/experimental study of the adsorption energies of: AA/ MF and EtOH / DME on the surface of water ice at low temperature. For each pair of isomers, theory and experiments both agree that it is the most stable isomer (AA or EtOH) that interacts more efficiently with the water ice than the higher energy isomer (MF or DME). This differential adsorption shows clearly in the different desorption temperatures of the isomers. It is not related to their intrinsic stability but linked to the fact that both AA and EtOH make more and stronger hydrogen bonds with the ice surface.The formation of water molecules from the reaction between O3 and D-atoms is studied experimentally for the first time. Ozone is deposited on non-porous amorphous solid water ice, and D-atoms are then sent onto the sample held at 10 K. HDO molecules are detected during the desorption of the whole substrate where isotope mixing takes place, indicating that water synthesis has occurred. The efficiency of water formation via hydrogenation of ozone is of the same order of magnitude as that found for reactions involving O-atoms or O2 molecules and exhibits no apparent activation barrier. These experiments validate the assumption made by models using ozone as one of the precursors of water formation via solid-state chemistry on interstellar dust grains.Here we applied machine learning and AI to build and improve moleculars reactions.

 

Meetings International -  Conference Keynote Speaker Eliade Stefanescu photo

Eliade Stefanescu

Academy of Romanian Scientists, Romania

Title: Quantum mechanics as a continuous matter dynamics

Biography:

Eliade Stefanescu is research professor at the Advanced Studies in Physics Institute of the Romanian Academy. He discovered a phenomenon of penetrability enhancement of a potential barrier by dissipative coupling, developed a microscopic theory of open quantum systems, discovered a physical principle and invented a device for heat conversion into usable energy, and produced a unitary quantum relativistic theory. He is member of American Chemical Society and of Academy of Romanian Scientists. He received the Prize of Romanian Academy for physics in 1983, the Gold Plate as a founding member of Academy of Romanian Scientists, and the Prize “Serban Titeica” in 2014 for the book Open Quantum Physics and Environmental Heat Conversion into Usable Energy, Sharjah (UAE): Bentham Science Publishers

Abstract:

The starting point of this research is the fact that the conventional Schrödinger equation is contradictory to the fundamental Hamilton equations: a minus sign, essential for the energy conservation, is missing in the group velocity of a particle in the momentum space.The agreement of the quantum dynamics with the Hamilton equations is obtained only when the Hamiltonian in the wave packets representing a quantum particle is replaced by the Lagrangian. We consider a relativistic Lagrangian, as the relativistic principle of the time-space interval invariance is regarded as a relativistic quantum principle of invariance of the time dependent phase of a quantum particle. According to the general theory of relativity, any acceleration of a differential matter element in an extrinsic (non-gravitational) field is perpendicular to its velocity. This means that the dynamics of a distribution of matter, with a density positively defined as product of the total mass with the square of a coordinate function, can be described by a Fourier series expansion of waves perpendicular to the velocity. However, such a description makes sense only for a total mass, as integral of the particle density, equal to the mass in the Lagrangian in the time dependent phase of the wave packet – quantization condition. We consider black quantum particles with a Lagrangian containing only the relativistic term proportional to the particle mass, and ‘visible’ particles, with additional terms depending on the particle ‘charge’, and potentials interacting with this charge.For an electric field, with a vector potential conjugated to the spatial coordinates and a scalar potential conjugated to time, from the Hamilton equations as group velocities in the coordinate and momentum spaces, we derive the Lorentz force and the Maxwell equations. For a quantum particle in electromagnetic field, we derive relativistic equations depending on the rest mass and the particle momentum and velocity. For a quantum particle in gravitational field, we derive the Schwarzschild solution for the metric tensor in a central gravitational field. We show that although this solution has a singularity forbidding the passage of a black hole boundary, such a passage is possible for a quantum particle, where a differential matter element, as a part of a quantum particle, is joint to other matter elements and to other quantum particles which perturb the constant gravitational field considered in the Schwarzschild solution. In this theory, the Universe is considered as a distribution of ‘intrinsic’ matter characterized by a system of time-space coordinates, curved in a larger system of other coordinates, by a gravitational field of a distribution of ‘extrinsic’ matter of quantum particles. We derive the quantum particle dynamics in gravitation field, the spin of the intrinsic matter element interacting with a quantum particle we call ‘graviton’, and the spin of the extrinsic matter distribution of a quantum particle depending on the symmetry of the wave function describing this distribution.