The Levi-Civita spacetime as a limiting case of the Gamma spacetime

It is shown that the Levi-Civita metric can be obtained from a family of the Weyl metric, the Gamma metric, by taking the limit when the length of its Newtonian image source tends to infinity. In this process a relationship appears between two fundamental parameters of both metrics.Comment: LaTeX2e 17 page

SCARA Self Posture Recognition Using a Monocular Camera

Robotic manipulators rely on feedback obtained from rotary encoders for control purposes. This article introduces a vision-based feedback system that can be used in an agricultural context, where the shapes and sizes of fruits are uncertain. We aim to mimic a human, using vision and touch as manipulator control feedback. This work explores the use of a fish-eye lens camera to track a SCARA manipulator with coloured markers on its joints for the position estimation with the goal to reduce costs and increase reliability. The Kalman Filter and the Particle Filter are compared and evaluated in terms of accuracy and tracking abilities of the marker’s positions. The estimated image coordinates of the markers are converted to world coordinates using planar homography, as the SCARA manipulator has co-planar joints and the coloured markers share the same plane. Three laboratory experiments were conducted to evaluate the system’s performance in joint angle estimation of a manipulator. The obtained results are promising, for future cost effective agricultural robotic arms developments. Besides, this work presents solutions and future directions to increase the joint position estimation accuracy.info:eu-repo/semantics/publishedVersio

Inter-limb symmetry at simultaneous and alternated arms flexion by the elbow during water fitness sessions

The aim was to compare the inter-limb symmetry between alternated and simultaneous arms flexion during water fitness sessions. Twenty-three elderly women were recruited to perform flexion by the elbow with di erent mechanical strategies: (a) simultaneous and (b) alternated. An incremental protocol was used, with four music cadences, starting at 105 beats per minute up to 150. The peak force of dominant and non-dominant upper-limbs was retrieved. A symmetry index (SI, %) was also used to quantify coordination. There were significant variations in force produced by the dominant and non-dominant limbs in most of the cadences in the alternated or simultaneous actions. Differences with a medium e ect between upper-limbs were shown when moving simultaneously indicating that an alternated movement can be a more proper strategy to work with. Despite that, both strategies seemed to be characterized by an asymmetric pattern (SI from 20 to 30%), requiring full attention from water fitness practitioners.This research was supported by the Portuguese Science and Technology Foundation under the project UID04045/2020.info:eu-repo/semantics/publishedVersio

Lepidópteros tortricídeos em pomares de pomóideas e de prunóideas da Beira Interior

Comunicação apresentada no 6.º Encontro Nacional de Protecção Integrada que decorreu em Castelo Branco, na Escola Superior Agrária do Instituto Poliécnico de Castelo Branco, de 14 a 16 de Maio de 2003, no âmbito do painel sobre Prunóideas.Neste trabalho são apresentados resultados de uma prospecção relativa às espécies de tortricídeos fitófagos de pomares de pomóideas e de prunóideas, na Beira Interior. O trabalho reporta-se a dados obtidos no ano de 2002, tendo sido utilizadas armadilhas sexuais para as capturas de adultos e observação visual para a detecção de larvas. As espécies monitorizadas foram: Adoxophyes orana, Cacoecimorpha pronubana, Pandemis heparana, Pandemis ribeana (=cerasana) e Cydia molesta. Das cinco espécies monitorizadas apenas houve capturas de Cacoecimorpha pronubana e de Pandemis heparana. Relativamente a estas duas espécies são apresentadas curvas de voo. Embora tenham sido detectados frutos com a sintomatologia característica do ataque destas espécies, não foram encontradas larvas, sugerindo populações economicamente insignificantes no ano de 2002

Geodesics in the Gamma spacetime

Circular and radial geodesics are studied in the spacetime described by the $\gamma$ metric. Their behaviour is compared with the spherically symmetric situation, bringing out the sensitivity of the trajectories to deviations from spherical symmetry.Comment: LaTeX, 19 pages, 3 eps figure

On the Levi-Civita solutions with cosmological constant

The main properties of the Levi-Civita solutions with the cosmological constant are studied. In particular, it is found that some of the solutions need to be extended beyond certain hypersurfaces in order to have geodesically complete spacetimes. Some extensions are considered and found to give rise to black hole structure but with plane symmetry. All the spacetimes that are not geodesically complete are Petrov type D, while in general the spacetimes are Petrov type I.Comment: Typed in Revtex, including two figures. To appear in Phys. Rev.

Two pioneers in the study of antiquity in Brazil

Apresentamos, neste artigo, a trajetória intelectual de duas classicistas brasileiras do século XX. Após propormos uma reconstituição histórica sobre a formação das instituições de Ensino Superior no território brasileiro, destacamos a formação das professoras Ingeborg Braren e Maria da Glória Alves Portal na Universidade de São Paulo. Objetiva-se, por um lado, tornar patente o pioneirismo de sua contribuição intelectual de ambas as docentes para o ensino e pesquisa sobre a Antiguidade Clássica no Brasil. Por outro lado, pretende-se contribuir para uma melhor compreensão do papel de protagonismo das mulheres no desenvolvimento da ciência do país, em geral, e dos estudos clássicos, em particular91Dossiê ensino de línguas estrangeiras/adicionais e suas literaturasThe paper deals with the scholarly life of twoBrazilian female pioneer classicists. The paper starts by describing the historical evolution of higher education in Brazil, then turning to the upbringing and scholarly life of professors Ingeborg Braren and Maria da Glória Alves Portal, both at the University of São Paulo. It aims at highlighting the pioneering aspects of their scholarly contribution to research and teaching of classical antiquity in Brazil. It also aims at contributing for an acknowledgement of the active role of women in developing scholarship in Brazil, particularly in the classic

Providing office workers with height-adjustable workstation to reduce and interrupt workplace sitting time: protocol for the Stand Up for Healthy Aging (SUFHA) cluster randomized controlled trial

© The Author(s) 2023. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.Background: Sedentary behavior (SB) has been linked to several negative health outcomes. Therefore, reducing SB or breaking up prolonged periods of SB improves functional fitness, food consumption, job satisfaction, and productivity. Reducing SB can be achieved by introducing a health-enhancing contextual modification promoted by a sit-stand desk in the workplace. The primary goal will be to test the effectiveness of this intervention in reducing and breaking up SB, while improving health outcomes in office-based workers during a 6-month intervention. Methods: A two-arm (1:1), superiority parallel-group cluster RCT will be conducted to evaluate the effectiveness of this intervention in a sample of office-based workers from a university in Portugal. The intervention will consist of a psychoeducation session, motivational prompts, and contextual modification promoted by a sit-stand desk in the workplace for 6 months. The control group will work as usual in their workplace, with no contextual change or prompts during the 6-month intervention. Three assessment points will be conducted in both groups, pre-intervention (baseline), post-intervention, and a 3-month follow-up. The primary outcomes include sedentary and physical activity-related variables, which will be objectively assessed with 24 h monitoring using the ActivPAL for 7 days. The secondary outcomes include (a) biometric indices as body composition, body mass index, waist circumference, and postural inequalities; and (b) psychosocial variables such as overall and work-related fatigue, overall discomfort, life/work satisfaction, quality of life, and eating behavior. Both the primary and secondary outcomes will be assessed at each assessment point. Discussion: This study will lean on the use of a sit-stand workstation for 6 months, prompted by an initial psychoeducational session and ongoing motivational prompts. We will aim to contribute to this topic by providing robust data on alternating sitting and standing postures in the workplace. Trial registration: The trial was prospectively registered, and the details are at: https://doi.org/10.17605/OSF.IO/JHGPW ; Registered 15 November 2022. OSF Preregistration.This study was funded by the ILIND “Fazer+” scientific program (Reference: FAZER+/ILIND/CIDEFES/1/2022).info:eu-repo/semantics/publishedVersio