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El límit per poder
publicitar en paper la celebració de seminaris i conferčncies
en els ascensors serŕ el divendres a les 12 hores de la semana
anterior. Amb posterioritat a aquesta data el seminari o
conferčncia quedarŕ només recollit a la web de la Facultat.
La publicitació en paper serŕ llavors responsabilitat dels
organitzadors.
Seminari del Dep. de Física Fonamental
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Títol: |
Martensitic
transitions and random field Potts model |
Conferenciant: |
Benedetta
Cerruti (Postdoct del Dept. d'Estructura i Constituents
de la Matèria) |
|
Abstract: |
Martensitic transition is a first
order solid-to-solid phase transition that occurs in
materials which display a variety of interesting features,
both on the applicative and the purely theoretical point
of view. These properties, like the shape memory effect,
justify the effort in the study of the issue; they come
from the interplay between different length-scale ranging
from macroscopic to microscopic. In this seminar, we
will present an overview of the models that we are developing
in order to study microstructure formation in martensites.
The models are based on a modification of the Random
Field Ising model with metastable dynamics, that includes
a 'dipolar' like term. The truncation of this term has
a crucial effect on the possible structures in the system. |
| Lloc
: |
Aula seminari Física
Fonamental (3.20) |
| Contacte: |
tonisantolaria@gmail.com |
Seminar of the Department d’Astronomia i Meteorologia
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| Títol: |
Introduction to Plasma Physics |
| Conferenciant: |
Dr. Rami Vainio Department of Physics. University of Helsinki, Finland |
| Abstract: |
Basic plasma theory
March 10. Lecture 1
Electrodynamics (short review)
Maxwell's equations, electromagnetic fields and potentials.
Electromagnetic waves, phase speed and
group speed, polarization. Lorentz force.
Basic plasma concepts
Plasma state, plasma oscillations and plasma frequency,
Debye shielding and Debye length. Gyro motion,
gyrofrequency and gyroradius. Particle collisions. Examples
of plasmas.
March 11. Lecture 2
Single-particle motion
Motion in homogeneous fields, E×B-drift. Adiabatic
invariants, gradient and curvature drifts. Magnetic
scattering. Example: charged-particle motion in the solar
wind)
Basic kinetic formulation
Distribution function. Vlasov equation. Examples of Vlasov
equilibria. Examples of kinetic instabilities.
March 12. Lecture 3
Fluid description
Scope of fluid approximation. Magnetohydrodynamic equations.
Multi-fluid equations. MHD equilibria
Magnetohydrodynamic waves
Dispersion relation for linear waves, MHD wave modes.
MHD shock waves. Example: Shock waves and
Alfvén waves in the solar wind
March 13. Lecture 4
Cold-plasma waves
Cold-plasma equations. Dispersion relation of cold-plasma
waves. Principal wave modes. Examples:
whistler waves in the magnetosphere, ion-cyclotron heating.
Introduction of homework problems
(With tips on how to solve them) |
| Lloc: |
Seminar of the Department
d’Astronomia i Meteorologia (seven floor) |
| Contacte: |
Blai Sanahuja |
Seminari del Institut de Ciències del Cosmos
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| Títol: |
Solar Energetic
Particles and the Solar Orbiter mission |
| Conferenciant: |
Blai Sanahuja
(UB) |
| Abstract: |
Observations at 1 AU show that ions
can be accelerated up to several GeVs and electrons to
tens of MeV in large solar energetic particle events
(SEPs). Large SEP events are associated with both large
solar flares and fast Coronal Mass Ejections (CMEs),
but they are believed to be mainly due to acceleration
by CME-driven shocks that propagate through the heliosphere.
Determining the origins of SEPs is important because
they cause large radiation increase in interplanetary
space and over the Earth's polar regions, and because
they provide an opportunity to understand the background
physics of energetic particle acceleration, escape and
transport along the interplanetary magnetic field. Solar
Orbiter is an ESA mission (launch currently foreseen
for 2015) conceived to perform by first time a close-up
study of the Sun (maximum approach 48 solar radii) and
of the inner heliosphere, from an out-of-the ecliptic
(~30 degrees) vantage point. The spacecraft will carry
a set of instruments to observe the solar atmosphere
(UV and visible telescopes, coronographs and a magnetograph),
as well as charged particles, magnetic field and wave
detectors for in situ measurements of particle fluxes,
solar wind plasma and the interplanetary magnetic field. |
| Lloc: |
Aula 507. 5ª planta.
Edifici vell |
| Contacte: |
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Seminari del Institut de Ciències del Cosmos
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| Títol: |
From nuclear
astrophysics to biology and medicine |
| Conferenciant: |
Edwin E.Salpeter,
Astronomy, Cornell University |
| Abstract: |
The fifty year anniversary of the
Burbidge, Burbidge, Fowler and Hoyle paper "Synthesis
of the Elements in Stars" has renewed interest in Nuclear
Astrophysics.I will describe my own work a few years
earlier still ( both successes and failures) and the
efforts at Cal.Tech. in 1951. I will mention the importance
of the 1953 Astrophysics summer school in Ann Arbor for
much future work including my own paper on the "Initial
Mass Function" for stars. Fir biophysics I will recall
theoretical models for the "Neuromuscular Junction",
the simplest of all synapses in animals, as they developed
over a few decades. This is an example of proceeding
from two-dimensional models to more realistic three-dimensional
ones. I will finish on the application of Statistics
to Maedical Research, including "Meta-analysis" on drugs
for Asthma and Hormone Replacement Therapy for Menopause. |
| Lloc: |
Aula 507. 5ª planta.
Edifici vell |
| Contacte: |
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| © Universitat
de Barcelona |
Edició: Secretaria
d'Estudiants i Docència Facultat de Física
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