THE PHYSCIS GRADUATE PROGRAM invites everyone to the seminar:
Gauge invariant quantum thermodynamics: consequences for the first law
Prof. Dr. Lucas Chibebe Céleri
Instituto de Física – UFG
Abstract:
Universality of classical thermodynamics rests on the central limit theorem, due to which measurements of thermal fluctuations are unable to reveal detailed information regarding the microscopic structure of a macroscopic body. When small systems are considered and fluctuations become important, thermodynamic quantities can be understood in the context of classical stochastic mechanics. A fundamental assumption behind thermodynamics is therefore that of coarse-graining, which stems from a substantial lack of control over all degrees of freedom. However, when quantum systems are concerned, one claims a high level of control. As a consequence, information theory plays a major role in the identification of thermodynamic functions. Here, drawing from the concept of gauge symmetry, essential in all modern physical theories, a new, intermediate, route is put forward. Working within the realm of quantum thermodynamics, a physically motivated gauge transformation, which encodes a gentle variant of coarse-graining behind thermodynamics, is explicitly constructed . As a consequence, quantum work and heat are reinterpreted, as well as the role of quantum coherence.
Date: November 5, 2021 – (friday) – Time: 10:15 a.m.
link to access the youtube channel: https://youtu.be/ieeh_LtXBgI
O Programa de Pós-Graduação em Física da UFSC torna público os editais do processo seletivo para os cursos de mestrado e doutorado para ingresso no semestre 2022/1.
As inscrições ocorrerão no período de 1 a 30 de novembro de 2021. O PPGFSC utiliza a nota do Exame Unificado de Pós-Graduações em Física – EUF para ingresso nos cursos de mestrado de doutorado.
Click aqui e acesse o site do processo seletivo do PPGFSC/UFSC.
Below is the link to access the result of the PPGFSC / UFSC Simplified Selection Process for admission to master and doctoral courses in the semester 2021/2:
Results
The candidates who receive a scholarship will be informed after the Scholarship Committee meeting.
THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar
Virtual-Slit Focusing in a Cycloidal Mass Spectrometer – A Proof of Concept
Dr. Rafael Bento Serpa
Postdoctoral Associate | Duke University Nanomaterials and Thin Films Lab
Abstract:
This work demonstrates a novel approach to mass spectrometry using the “virtual-slit” created by the small, spatial volume from which ions are generated by localized ionization techniques (e.g., laser ionization of particles and surfaces, and spark ionization). That is, the volume in which the ions are generated creates a localized source of ions in much the same way as a slit that allows only ions from a specific cross-sectional area to pass. As demonstrated in this work, the unique perfect focusing properties of a cycloidal mass analyzer can enable the localized ionization volume to function as a virtual slit. In this manuscript, we provide a proof-of-concept (POC) demonstration of a virtual-slit cycloidal mass spectrometer (VS-CyMaS) consisting of a cycloidal mass analyzer, a laser ionization source, and an ion array detector. The laser is used to ionize either bulk or thin-film samples of Cu, Ti, Ni, and Cr. Results indicate that the width of the peaks at the detector is the same as the laser spot size, validating the concept of virtual-slit focusing. Furthermore, the material ablated with each laser pulse for Ti and Cu is estimated at 60 and 140 fg, respectively, indicating that a very low detection limit is possible given the ability of the cycloidal mass analyzer to collect ions generated by laser ionization that have wide energy and angular dispersions.
Date: October 29, 2021 – (friday) – Time: 10:15 a.m.
link to access the youtube channel: https://youtu.be/t75RNYAdy1s
Defense of Doctoral Thesis
Everton Botan
IDENTIFICATION OF VARIABLE STARS IN THE VVV SURVEY AND INVESTIGATION OF STRUCTURES IN THE GALACTIC BULG
Defense Committee:
Prof. Dr. Roberto Kalbusch Saito – (president) – (UFSC/FSC)
Prof. Dr. Jacques Raymond Daniel Lepine – (external member) – IAG/USP
Prof. Dr. Helio Jaques Rocha-Pinto – (external member) – Observatório do Valongo – UFRJ
Prof. Dr. Daniel Ruschel Dutra – (membro titular) – UFSC/FSC
Prof. Dr. Antônio Nemer Kanaan Neto – (201701791) – UFSC/FSC
Date: October 29, 2021 – friday – Times: 9:30 am – Place: videoconference
Virtual room access link: https://meet.google.com/dof-hsws-ezf
