543 research outputs found
New forms of BRST symmetry in rigid rotor
We derive the different forms of BRST symmetry by using the
Batalin-Fradkin-Vilkovisky formalism in a rigid rotor. The so called
"dual-BRST" symmetry is obtained from usual BRST symmetry by making a canonical
transformation in the ghost sector. On the other hand, a canonical
transformation in the sector involving Lagrange multiplier and its
corresponding momentum leads to a new form of BRST as well as dual-BRST
symmetry.Comment: 10 Pages, revtex, No Fig
NUMERICAL SIMULATION OF AIRFOILS APPLIED TO UAVs
This essay aims the process optimization when referred to aeronautical projects. By using mesh generators softwares and simulations made in CFD, the article employs numerical techniques to simulate airfoils and shows that is possible to extract accurated and conservative outcomes when compared to wind tunnel results. The test cases studied were based on the Selig 1223 type of airfoil and developed into the ANSYS platform, whereas by using the ICEM mesh tool, structured meshs were generated and imported to the CFX enviroment, where they could be simulated and analyzed
Phocidae species in Azores archipelago
List of Phocidae species recorded in Azores archipelago (Portugal).FUNDING: Azores PO 2020 - ACORES-01-0145-FEDER-000072. This project was financed by FEDER in 85% and by Azorean Public funds by 15% through Operational Program Azores 2020. This work is also funded by FEDER funds through the COMPETE 2020 Programme and National Funds through FCT - Portuguese Foundation for Science and Technology under the Research Infrastructure PORBIOTA - Portuguese E-Infrastructure for Information and Research on Biodiversity, project number POCI-01-0145-FEDER-022127.info:eu-repo/semantics/publishedVersio
Occurrences of Sea turtles in Azores Archipelago
Sea turtles are the best-known and more widespread marine reptiles. However, information on their distribution and the occurrence of most species, except for nesting beaches, remains scarce and sporadic, depending on sightings from fishing vessels, tourist activities and occurrences in coastal areas as well as fishing bycatch. Since the last updated speciesā list for the Azores (Santos et al, 2010), no new speciesā record was known for Azorean waters, until October 2020, with the confirmed sighting of an Olive Ridley, Lepidochelys olivacea (Eschscholtz, 1829) (Barcelos et al. 2021). After that, in February 2021, a second individual was found stranded on Pico Island, already in an advanced state of decomposition. This increased the number of species present in Azores EEZ (Exclusive Economic Zone) to six out of the seven extant worldwide. The remaining one, Natator depressus (Garman, 1880), is native to the Indo-pacific (see Red List Standards & Petitions Subcommittee, 1996).FUNDING: AZORESBIOPORTAL ā PORBIOTA (Azores PO 2020 - ACORES-01-0145-FEDER-000072) TOTAL BUDGET: 299. 901,83ā¬ EU Support: 254. 916, 56ā¬ This project was financed by FEDER in 85% and by Azorean Public funds by 15% through Operational Program Azores 2020. This work is also funded by FEDER funds through the COMPETE 2020 Programme and National Funds through FCT - Portuguese Foundation for Science and Technology under the Research Infrastructure PORBIOTA - Portuguese E-Infrastructure for Information and Research on Biodiversity, project number POCI-01-0145-FEDER-022127.
For the period 2022-2023- Portal da Biodiversidade dos AƧores (2022-2023) - PO Azores Project - M1.1.A/INFRAEST CIENT/001/2022.info:eu-repo/semantics/publishedVersio
Pinniped (Carnivora, Phocidae) occurrences in the Azores Archipelago (NE Atlantic)
BACKGROUND: The last Pinniped species update was in 2010, as part of the list of the terrestrial and marine biota from the Azores. This list includes a chapter dedicated to marine mammals, based on previously published bibliography.
NEW INFORMATION: No new species were added since that list was published. However, there were new occurrences since the last update.Funding Institutions: AZORESBIOPORTAL ā PORBIOTA (Azores PO 2020 - ACORES-01-0145-FEDER-000072) TOTAL BUDGET: ā¬299,901.83 EU Support: ā¬254, 916.56. This project was financed by FEDER in 85% and by Azorean Public funds by 15% through the Operational Programme Azores 2020. This work is also funded by FEDER funds through the COMPETE 2020 Programme and National Funds through FCT - Portuguese Foundation for Science and Technology under the Research Infrastructure PORBIOTA - Portuguese E-Infrastructure for Information and Research on Biodiversity, project number POCI-01-0145-FEDER-022127.
For the period 2022-2023- Portal da Biodiversidade dos AƧores (2022-2023) - PO Azores Project - M1.1.A/INFRAEST CIENT/001/2022.
Open access will be supported by the project FCT-UIDB/00329/2020-2024 (Thematic Line 1 ā integrated ecological assessment of environmental change on biodiversity).info:eu-repo/semantics/publishedVersio
Occurrences of pinnipeds (Carnivora, Phocidae) in the Azores archipelago (Portugal)
An inventory of historical and actual occurrences of pinnipeds in the Azores archipelago. The data used come from Silva et al. (2009) and from RACA - Rede de Arrojamentos de CetƔceos dos AƧores (RACA-DRAM-RAA).FUNDING: Azores PO 2020 - ACORES-01-0145-FEDER-000072. This project was financed by FEDER in 85% and by Azorean Public funds by 15% through Operational Program Azores 2020. This work is also funded by FEDER funds through the COMPETE 2020 Programme and National Funds through FCT - Portuguese Foundation for Science and Technology under the Research Infrastructure PORBIOTA - Portuguese E-Infrastructure for Information and Research on Biodiversity, project number POCI-01-0145-FEDER-022127.info:eu-repo/semantics/publishedVersio
The genetic diversity of the American oil palm, Elaeis oleifera (Kunth), CorƩs revealed by nuclear RFLP markers.
Lagrangian approach to a symplectic formalism for singular systems
We develop a Lagrangian approach for constructing a symplectic structure for
singular systems. It gives a simple and unified framework for understanding the
origin of the pathologies that appear in the Dirac-Bergmann formalism, and
offers a more general approach for a symplectic formalism, even when there is
no Hamiltonian in a canonical sense. We can thus overcome the usual limitations
of the canonical quantization, and perform an algebraically consistent
quantization for a more general set of Lagrangian systems.Comment: 30 page
Symmetry transform in the Faddeev-Jackiw quantization of dual models
We study the presence of symmetry transformations in the Faddeev-Jackiw
approach for constrained systems. Our analysis is based in the case of a
particle submitted to a particular potential which depends on an arbitrary
function. The method is implemented in a natural way and symmetry generators
are identified. These symmetries permit us to obtain the absent elements of the
sympletic matrix which complement the set of Dirac brackets of such a theory.
The study developed here is applied in two different dual models. First, we
discuss the case of a two-dimensional oscillator interacting with an
electromagnetic potential described by a Chern-Simons term and second the
Schwarz-Sen gauge theory, in order to obtain the complete set of non-null Dirac
brackets and the correspondent Maxwell electromagnetic theory limit.Comment: 22 pages, RevTex file, no figur
First record of the great barracuda, Sphyraena barracuda (Perciformes, Sphyraenidae), in the Azores, northāeast Atlantic
One individual of Sphyraena barracuda was collected on August 5, 2023, in the northern coast of Terceira Island, Azores, Portugal, by spearfishing. In this note, we report this first record and discuss the occurrence, which represents the northernmost one in the north-east Atlantic.info:eu-repo/semantics/publishedVersio
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