Search

Your search keyword '"Athanasiou, Stavros"' showing total 508 results
Start Over Author "Athanasiou, Stavros"
508 results on '"Athanasiou, Stavros"'

1. Thouless pumping in Josephson junction arrays

Author

Athanasiou, Stavros, Nielsen, Ida E., Wauters, Matteo M., and Burrello, Michele

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Superconductivity, Quantum Physics
Abstract

Recent advancements in fabrication techniques have enabled unprecedented clean interfaces and gate tunability in semiconductor-superconductor heterostructures. Inspired by these developments, we propose protocols to realize Thouless quantum pumping in electrically tunable Josephson junction arrays. We analyze, in particular, the implementation of the Rice-Mele and the Harper-Hofstadter pumping schemes, whose realization would validate these systems as flexible platforms for quantum simulations. We investigate numerically the long-time behavior of chains of controllable superconducting islands in the Coulomb-blockaded regime. Our findings provide new insights into the dynamics of periodically driven interacting systems and highlight the robustness of Thouless pumping with respect to boundary effects typical of superconducting circuits., Comment: 26 pages, 12 figures

Published
2023
Full Text
View/download PDF

4. A variational model for the delayed collapse of Bose Einstein condensates

Author

Theodorakis, Stavros and Athanasiou, Stavros

Subjects
Condensed Matter - Quantum Gases
Abstract

We present an action that can be used to study variationally the collapse of Bose Einstein condensates. This action is real, even though it includes dissipative terms. It adopts long range interactions between the atoms, so that there is always a stable minimum of the energy, even if the remaining number of atoms is above the number that in the case of local interactions is the critical one. The proposed action incorporates the time needed for the abrupt and delayed onset of collapse, yielding in fact its dependence on the scattering length. We show that the evolution of the condensate is equivalent to the motion of a particle in an effective potential. The particle begins its motion far from the point of stable equilibrium and it then proceeds to oscillate about that point. We prove that the resulting large oscillations in the shape of the wavefunction after the collapse have frequencies equal to twice the frequencies of the traps. Our results agree with the experimental observations.

Published
2020
Full Text
View/download PDF

7. Propofol Versus Dexmedetomidine for Conscious Sedation During Vaginal Hysterectomy With Pre-emptive Local Anesthesia: A Prospective Cohort Study.

Author

HADZILIA, SOFIA, GRIGORIADIS, THEMOS, PRODROMIDOU, ANASTASIA, STAMATAKIS, EMMANOUIL, PAPADOPOULOU, DIMITRA, ZACHARAKIS, DIMITRIOS, ATHANASIOU, STAVROS, and VALSAMIDIS, DIMITRIOS

Abstract

Background/Aim: Hysterectomy is the most frequent gynecological surgery. Vaginal hysterectomy (VH) seems to be related to favorable perioperative outcomes compared to abdominal or laparoscopic approaches. As the population ages, anesthesia that is safer for the elderly, such as local anesthesia (LA) with conscious sedation, is gaining popularity and is related to favorable outcomes in patients’ recovery compared to general or regional anesthesia. We aimed to evaluate the efficacy of dexmedetomidine versus propofol for women undergoing VH for uterine prolapse under LA and conscious sedation. Patients and Methods: A prospective study on 40 women with uterine prolapse stage ≥3 who had VH under LA with conscious sedation under either dexmedetomidine (n=20) or propofol (n=20) was performed. A standardized surgical approach with continuous hemodynamic monitoring and sedation assessment using the Ramsay Sedation Scale (RSS) was conducted. The primary endpoint of the study was to determine the percentage of patients receiving intraoperative fentanyl. Results: Analysis of outcomes demonstrated a significant reduction in the proportion of patients requiring intraoperative rescue fentanyl (35% vs. 5%, respectively, p=0.04) and in postoperative pain scores, with more patients achieving an optimal RSS score of 3 in the dexmedetomidine group. Conclusion: Based on the findings of the present study, dexmedetomidine offered superior analgesia and patient comfort compared to propofol, suggesting a favorable anesthetic profile for VH under LA. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

13. Thouless pumping in Josephson junction arrays

Author

Athanasiou, Stavros, Nielsen, Ida Egholm, Wauters, Matteo M., Burrello, Michele, Athanasiou, Stavros, Nielsen, Ida Egholm, Wauters, Matteo M., and Burrello, Michele

Published
2024

33. sFLT1, PlGF, the sFLT1/PlGF Ratio and Their Association with Pre-Eclampsia in Twin Pregnancies—A Review of the Literature

Author

Sapantzoglou, Ioakeim, primary, Rouvali, Angeliki, additional, Koutras, Antonios, additional, Chatziioannou, Maria Ioanna, additional, Prokopakis, Ioannis, additional, Fasoulakis, Zacharias, additional, Zachariou, Eleftherios, additional, Douligeris, Athanasios, additional, Mortaki, Anastasia, additional, Perros, Paraskevas, additional, Ntounis, Thomas, additional, Pergialiotis, Vasilios, additional, Domali, Ekaterini, additional, Athanasiou, Stavros, additional, Daskalakis, George, additional, Rodolakis, Alexandros, additional, Panagopoulos, Periklis, additional, and Pappa, Kalliopi I., additional

Published
2023
Full Text
View/download PDF

37. CO 2 Laser versus Sham Control for the Management of Genitourinary Syndrome of Menopause: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.

Author

Prodromidou, Anastasia, Zacharakis, Dimitrios, Athanasiou, Stavros, Kathopoulis, Nikolaos, Varthaliti, Antonia, Douligeris, Athanasios, Michala, Lina, Athanasiou, Veatriki, Salvatore, Stefano, and Grigoriadis, Themos

Subjects
GENITOURINARY diseases, RANDOMIZED controlled trials, CARBON dioxide, LASERS, VAGINAL dryness, LASER therapy
Abstract

In the context of the menopausal transition, genitourinary syndrome of menopause (GSM) refers to a range of genitourinary symptoms, from vaginal dryness to dysuria and urinary urgency. While hormonal treatments are standard, their associated side effects have driven the exploration of alternatives like vaginal CO2 laser. We aimed to evaluate the randomized controlled trials (RCTs) comparing vaginal CO2 laser treatment for GSM to sham controls. This systematic review sourced four electronic databases until June 2023. The analysis incorporated seven RCTs with 407 women. The CO2 laser and sham control were comparable for most parameters, including the female sexual function index (FSFI) and visual analogue scale (VAS) for dyspareunia, vaginal health index, pH, and patient satisfaction. However, the CO2 laser group showed significant improvement in the vaginal assessment scale for GSM symptoms. Sensitivity analyses revealed that parameters like FSFI showed significant differences in favor of CO2 laser group upon the exclusion of specific studies. In conclusion, vaginal CO2 laser therapy emerges as a promising alternative for GSM management, especially for most bothersome GSM symptoms; however, the need for further well-designed RCTs remains to validate its broad safety and efficacy. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

38. Letters to the Editor

Author

Gonzalez, Pablo, Salvatore, Estefano, Athanasiou, Stavros, Borrego, Rafael Sanchez, Leibaschoff, Gustavo, Tserotas, Konstantino, Escribano, Juan, Zerbinati, Nicola, and Awad, David Vasquez

Published
2019
Full Text
View/download PDF

42. To the Editor

Author

Gonzalez, Pablo, Salvatore, Estefano, Athanasiou, Stavros, Borrego, Rafael Sanchez, Leibaschoff, Gustavo, Tserotas, Konstantino, Escribano, Juan, Zerbinati, Nicola, and Awad, David Vasquez

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results