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Cardoso, Carlota24/06/2021, 09:20
BepiColombo, one of ESA’s cornerstone missions, launched in 2018, will study the composition, geophysics, atmosphere, magnetosphere and history of Mercury. On board of one of Bepi's spacecrafts is the BERM radiation monitor, that will complement the scientific investigations of the Hermean environment, by providing measurments of the energetic particle population.
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The effect of radiation,... -
Caçador, Afonso (Instituto Superior Técnico)24/06/2021, 09:30
Gallium Nitride (GaN) is a wide bandgap semiconductor, with a broad range of optical and electric applications. One field of particular interest is the area of power electronics, as group III nitrides are handled as an energy-efficient alternative for the currently used silicon power devices. Indeed, GaN technology has matured during the last two decades promising huge energy savings if widely...
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Severino, Clara24/06/2021, 09:40
Dark matter makes up 25$\%$ of the energy-mass budget of the Universe, about five times more than bayonic matter, and yet we still don't know what it is made of. Nonetheless, phenomena such as gravitational lensing, the abnormally fast rotation of galaxies, as well as density perturbations in the cosmic microwave background radiation have provided not only evidence of this type of matter, but...
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Ornelas, João (IST)24/06/2021, 09:50
As the world develops, it is inevitable that society has to adapt to the changes that occur. One of the sectors that is experiencing such developments is the transportation sector. As the global warming and climate change concerns increase, it is important to turn our attention to cleaner energies and create ways to ease the adaptation to these changes.
With that in mind, the scientific...
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Veiga, Jose24/06/2021, 10:00
In recent times, electric vehicles (EVS) are becoming more commonplace in transportation sector, and the reasons behind this are many. The most eminent one is their contribution in reducing greenhouse gas (GHG) emissions. However, battery recharging and range anxiety have been the Achilles heel of electric vehicle due to the low density and high mass of batteries in comparison with fuel....
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Sofia Ramalhete, Ana24/06/2021, 10:10
Particle accelerators have many important applications, one of them being the study of fundamental particles and the forces that act between them. Although we have a good understanding of the current Standard Model, we also know that there is still a lot to learn, and to do so we need particles with more energy, and thus we need to improve current particle accelerators.
The use of plasmas...
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Gaspar, João (Instituto Superior Tecnico)24/06/2021, 10:20
One of the main power sources available in space for powering satellites and spacecrafts is the sun. Photovoltaic systems can be installed to convert the incident sunlight into usable electrical power, but they need to be able to operate in harsh space environments with strong radiation fields, extreme temperature changes and in vacuum. In this context, CIGS solar cells (based on thin films of...
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Martins, Joao24/06/2021, 10:30
A recent paper has interpreted the GW190521 signal, detected with the LIGO and Virgo detectors, as being a merger of two Proca stars composed of a vector boson with a mass of the order 10^-13 eV. This particle can be considered as a dark matter candidate. The Higgs Characterization model can be used to produce a similar particle, and consequently simulate its detection at the LHC.
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In this... -
Cabrito, Tomás24/06/2021, 10:40
The modification of colour coherence effects in QCD radiation due to the presence of a QGP has been the focus of an extensive theoretical effort in the last decade. The fundamental building block of this effort is the computation of the interference emission of a gluon from a pair of partons (quarks or gluons) with a common direct ancestor, what is usually referred as the antenna spectrum....
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Piçarra, Pedro24/06/2021, 11:00
Accretion disks are a flattened band of spinning matter around a massive central object such as a black hole. While a black hole, by definition, does not emit any radiation, an accretion disk does. Its spectrum depends, among other things, on the properties of the surrounding spacetime. This makes them very useful astrophysical objects for testing general relativity, probing spacetime, and...
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Silva, Mariana (GoLP/IPFN Instituto Superior Técnico, Universidade de Lisboa)24/06/2021, 11:10
Today, most ultrashort lasers are already capable of producing pulses in the order of dozens of femtoseconds using mode-locked Ti:Sapphire oscillators. This pulses have paved the way to the emergence of attosecond science by enabling the generation of XUV pulses of several tenths of attoseconds duration via high-harmonic generation. This ultrashort pulses are the tools of choice for exploring...
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Gomes, João (Instituto Superior Técnico)24/06/2021, 11:20
The new packaging solutions introduced by semiconductor device manufacturers require powerful, accurate and true 3D failure localization techniques to yield Non-Destructive Failure Analysis (FA) useful in this new era of increasingly complex microelectronic devices. Magnetic Current Imaging (MCI) is one such technique that relies on the reconstruction of the current path inside a...
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Sobral, Leandro24/06/2021, 11:30
One of the most interesting and staggering solutions of the Einstein equation is the black hole. In recent years, numerical relativity has experienced a tremendous growth, generating a wealth of information about astrophysical black hole binaries; however, few studies explore the physics of charged black hole binaries. The goal of this thesis is to study, numerically, the dynamics of such...
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Mr Antunes, Sebastião (Instituto Superior Técnico)24/06/2021, 11:40
Measurements of photon absorption as a solid turns into a plasma were taken and will be studied (Warm Dense Model). A femtosecond IR laser was used for isochoric heating. The changes in absorption are measured by an independent XUV probe pulse that allows for 50fs temporal resolution and a CCD is used for spatial resolution as well. A drop in opacity is found, at first glance consistent with...
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