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Jornadas CeFEMA 2019

16–17 Sept 2019
Instituto Superior Tecnico, Campus Alameda
Europe/Lisbon timezone

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12. Hemocompatible nanostructured membranes for artificial organs
Dr Mónica Faria
16/09/2019, 09:35

Artificial Organs are generally associated to clinically well-established membrane-based treatments that assure in extracorporeal blood circulation devices the separation functions of a failing organ like the hemodialyzer (HD) for the kidney or the membrane blood oxygenator (MBO) for the lungs.
Current available medical devices used in these treatments are implicated with severe long-term...
13. Tailoring asymmetric structures of cellulose acetate/silica membranes for the artificial kidney
Miguel Pereira da Silva
16/09/2019, 10:00

The cellulose acetate (CA) membranes, developed in the early 1960s by Loeb and Sourirajan [1] for sea water desalination,
are prepared by the wet phase inversion method [2] which is responsible for creating an asymmetric structure. The structure
is composed of a thin skin dense layer that determines the membrane selective characteristics and a porous sublayer which
provides mechanical...
14. Modeling of macro-cryoconcentration phenomena during the freezing of bio-pharmaceutical aqueous solutions
Francisco Barata
16/09/2019, 10:15

Modelling unstirred freezing of aqueous solutions with volumes between few millilitres and hundreds of litters is very useful in a multitude of applications. Aqueous solutions are frozen, for instance, in the food or biopharma industries to preserve the main ingredients. In these two applications, the quality of the frozen product depends on the adequate design of the freezing systems. To get...
4. Interacting Quantum Matter, Non-Equilibrium and Topology
Prof. Pedro Ribeiro (CeFEMA/IST)
16/09/2019, 11:00

This talk gives an overview of some of the recent work developed at CeFEMA in the area of Condensed Matter Theory.
My goal is to provide an integrated view of the different lines of research and their main motivation, as well as, to present the people working on them and the results they obtained. Finally, I would like to tell you about some of the future directions of our research.
5. Quantum Open Systems with Matrix Product States
Miguel Oliveira
16/09/2019, 11:15

The density matrix renormalization group is one of the most accurate numerical methods applied to the study of 1D quantum many body system. It can be framed as a variational problem by using what is called matrix product states (MPS). Its success is due to the fact that these variational representations exactly target area-law states, which in 1D require but a small number of parameters to be...
6. Disordered topological systems
Miguel Gonçalves
16/09/2019, 11:30

We will discuss topological systems under the influence of disorder effects. We start by briefly introducing the topics of topological and disordered systems. We will then characterize the interplay between topology and disorder (quenched and annealed), providing examples of three different models characterized by the author: the disordered Haldane model, the Haldane-Falicov-Kimball model and...
7. The vortex, the impurity, and the finitude of bound states
João Bráz
16/09/2019, 11:45

We consider the problem of finding the bound-state spectrum of an impurity immersed in a weakly interacting two-dimensional Bose-Einstein condensate supporting a single vortex. We obtain approximate expressions for the energy levels and show that, due to the finite size of the condensate, the impurity can access only a finite number of physical bound states. By virtue of the topological...
8. Tracking Topological Phase Transitions
Syed Tahir Amin
16/09/2019, 12:00

We study the behavior of the fidelity and the Uhlmann connection in one and two- dimensional systems of free fermions with short range [1] as well as long range [2] amplitudes that exhibit non-trivial topological behavior. In particular, we use the fidelity and a quantity closely related to the Uhlmann factor in order to detect phase transitions at zero and finite temperature for topological...
1. Lattice QCD computations at CeFEMA
Pedro Bicudo (IST Lisboa)
16/09/2019, 14:00

The lattice QCD group at CeFEMA, researches hadronic physics with high performance computing. Lattice QCD starts from the QCD Lagrangian, and utilizes discrete techniques inspired in condensed matter physics. We develop CUDA codes to run in our servers with some o the NVIDIA graphics boards with the largest number of cores and memory. We generate our gluon configurations using Monte Carlo...
2. Quantum excitations of flux tubes
Nuno Cardoso (IST)
16/09/2019, 14:15

This talk gives an overview about flux tubes on Lattice QCD. We will show the results for flux tubes at zero and finite temperature. Finally, we will present recent results of the excited spectrum of the gluonic fields produced by a static quark-antiquark pair.
3. Wilson Loop calculations
Alireza Sharifian
16/09/2019, 14:30

I will talk about the calculation of Wilson's loop and how to extract the form on potential between quark and anti-quark without using smearing and compare the speed of the of the code on CPU and GPU. I will finish with a roughly talk on calculation of hybrids' properties which is the next phase of my work.
22. Electrochemical Technologies for Tackling Energy and Environmental Problems
Diogo Santos (IST)
16/09/2019, 15:35

Traditional technologies for dealing with domestic and industrial effluents are often expensive or lead to low treatment efficiencies. Electrochemical technologies offer several advantages over those methods and, for that reason, are receiving increasing importance. On the other hand, fossil fuel depletion and environmental concerns are putting electrochemical energy conversion and storage...
15. LignoPower: technology for lignin isolation by black liquor electrolysis
Raisa Oliveira
16/09/2019, 15:45

Black liquor is a secondary product of pulp mills that contains a considerable amount of organic compounds. Currently, this by-product is burned in recovery furnaces, in order to recover chemicals and to generate energy. However, during production peaks, the black liquor produced could exceeds the capacity of those equipment, being a bottleneck in pulp production. Considering that, several...
16. Zero-valent ruthenium nanoparticles incorporated in Fe-BTC metal-organic framework as anode catalyst for direct borohydride-peroxide fuel cell
Gordana Backovic
16/09/2019, 16:00

As the human exigency for energy is constantly increasing, the world is facing excessive use of fossil fuels as energy sources known to have undesirable impact on human lives and environment. Hence, with the development of modern society, the need for clean energy and shift to low carbon economy has also been growing. In order to deal with those issues, researchers have introduced different...
17. Organic load removal from swine breeding wastewater using electrochemical oxidation
Gonçalo Lourinho
16/09/2019, 16:15

Swine wastewater (SW) is a complex substrate that contains varying amounts of micronutrients (nitrogen and phosphorus compounds), as well as organic matter. The need for removing these pollutants from SW is undeniable to avoid their dangerous accumulation on the environment. Most farms use biological methods (e.g. anaerobic lagoons) as standard practice for wastewater treatment [1]; however,...
18. The influence of glaze on the tribological properties of zirconia dental pieces obtained by subtractive and additive manufacturing
Ana Catarina Branco
17/09/2019, 09:35

Ceramic based prosthetic materials are highly used for the repairing/replacing of a damaged/missing tooth, due to their suitable mechanical and aesthetic properties, chemical stability and biocompatibility. Additive manufacturing (AM) has emerged as new methodology to obtain long term 3D dental pieces at low cost, decreasing the materials’ waste and production time relatively to the...
21. On the wear behaviour of LASER clad Colmonoy-6 coatings under corrosive media
Ivan Rodrigues
17/09/2019, 09:50

The process of laser cladding using Ni-Cr-B-Si-C alloy powders has gained relevance as a method to produce hardfacing coatings that provide excellent surface wear and corrosion resistance in a corrosive environment. However, under chemically aggressive media, the wear performance of such coatings is dependent on the synergic interaction between mechanical wear and electrochemical corrosion...
19. Ageing of single crystalline laser deposited René N4 nickel superalloy
José Cardoso
17/09/2019, 10:05

The outstanding creep and thermal fatigue resistance of the high-temperature alloys used in the hot section of gas turbine engines for the aerospace and energy production industries are ensured by a single-crystalline structure and a microstructure composed of cuboidal γ' phase precipitates densely distributed in a γ phase matrix, which is generated during a complex ageing treatment. This...
20. Influence of laser surface nanotexturing on the friction of silicon in dry sliding conditions
Isabel Alves Lopes
17/09/2019, 10:20

The aim of the present work was to understand the role of Laser-Induced Periodic Surface Structures (LIPSS) on the friction behavior of silicon. A uniform LIPSS texture was generated on Si using femtosecond pulsed laser radiation. The wear tests were performed using a reciprocating ball-on-flat nanotribometer in dry sliding conditions and using polytetrafluoroethylene (PTFE) as counterbody....
9. NMR Relaxometry in Complex Soft-Matter Systems: Experimental Results and Model Fitting
Pedro Sebastião
17/09/2019, 11:10

Molecular order and dynamics of the CB-C9-CB liquid crystalline dimer exhibiting the nematic (N) and the twist bend nematic (Ntb) phases [1-2] were investigated by proton NMR spectroscopy, using fields of 0.78 T and 7.04 T, and relaxometry. The first relaxometry experiments for a very wide Larmor frequency domain (8 kHz–300 MHz) on this system, using a combination of standard and fast field...
10. 1H NMR relaxation study of molecular dynamics in the nematic and NT-B phases formed by the liquid crystal dimer DTC5C7
Anant Kumar
17/09/2019, 11:20

Liquid crystalline dimers linked by an odd numbered hydrocarbon spacer are of significant interest due to their LC polymorphism, specifically due to the formation of the Ntb phase [1] in some of the LC dimers. The Ntb phase has been discovered recently and, the detailed description and understanding at the molecular level in this phase is still qualitative. In this work, by using a range of...
11. NMR study of the molecular dynamics in magnetic and non-magnetic ionic liquids
Maria Beira
17/09/2019, 11:35

Recent studies [1-3] have shown a considerably large paramagnetic relaxation enhancement associated with mixtures comprising magnetic ionic liquids (MILs) (based on either [Aliquat]+ or [P66614]+ cations and on a [FeCl4]- anionic complex) and their analogous ionic liquids (respectively [Aliquat][Cl] and [P66614][Cl]). These properties were, however, destroyed when the same amount of...

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