Textron Systems (United Kingdom)

Small unmanned aircraft systems (sUAS) face unique challenges in system identification due to their lightweight, small size, and increased sensitivity to wind and gusts. To address these challenges, flight test procedures for sUAS system identification using open-loop and closed-loop flight data are presented. The approaches are demonstrated through system identification of a small flying-wing UAS equipped with a low-cost Pixhawk autopilot. The open-loop method is demonstrated through identification of the longitudinal bare-airframe aircraft dynamics. Longitudinal frequency responses were estimated from the open-loop flight data, and a linear state space model was identified from the estimated frequency responses and supplemental trim data, which was used to better identify parameters related to the low-frequency phugoid mode. The identified phugoid mode matches well with low-frequency oscillations measured from flight data in the time domain. The closed-loop method is demonstrated through identification of the lateral-directional dynamics. This approach is shown to improve the signal-to-noise ratio and reduce deviation from the reference flight condition, which improves modeling results, and it can be used to simultaneously identify the bare-airframe, closed-loop, and broken-loop UAS dynamics from the same set of closed-loop flight data, reducing time and efforts spent flight testing. The identified lateral-directional model is compared with closed- and broken-loop frequency responses estimated from flight data. The results show excellent agreement, with all computed metrics, such as stability margins, matching within 10%, demonstrating the effectiveness of this method.

Ce dossier inaugure une série de recherches dédiées à l’étude du témoignage comme discours de résistance. En mettant en lumière des contextes où les droits humains sont violés et où se manifeste la haine d’autrui – crimes de guerre, génocides, crises migratoires et autres désastres collectifs – il cherche à analyser les caractéristiques sémiotiques et discursives des témoignages en croisant les perspectives énonciatives, rhétoriques et argumentatives. Le témoignage y est envisagé en tant qu’...

In Björn Larsson’s novels and essays, Northern seas are experienced as one example of what the sea can offer human beings in terms of freedom from any boundaries and intimate relation with nature; at the same time, however, since his first literary attempts Larsson seems to have pointed out (or built up) an expansion of the Northern dimension when approaching life by and on the sea: this broader image has much to do with the traces of ancient Celts’ culture, as well as with his characters’ destinies and ambitions and, not least, his own accounts for real sea experiences. This paper provides meaningful examples of Larsson’s attitude and contribution to the representation of the Northern Sea, while reflecting on the role of the sea in his works.

Abstract This paper discusses the observations and results from wind tunnel tests and simulations of an isolated 6x6x8 ft CONEX cargo container carried in a 2-point inverted-V suspension with a laterally active forward cargo hook (ACH). Wind tunnel tests on a model-scale configuration showed a growing roll-yaw limit cycle oscillation in forward flight with a progressive shifting of the load from the rear hook to the forward hook as the speed increased and eventual rear cable slackening. A simulation model of the full-scale load-suspension configuration was developed and achieved good agreement with the wind tunnel results after including the nonlinear stretching properties of the test cables and accounting for the unsteady aerodynamics of the CONEX. A lateral ACH controller design based on the linearized simulation model showed good load stabilization performance using lagged load attitude feedback. Load distribution to the two hooks could be controlled by cable length adjustments at the rear hook. This paper discusses the observations and results from wind tunnel tests and simulations of an isolated 6x6x8 ft CONEX cargo container carried in a 2-point inverted-V suspension with 1 a laterally active forward cargo hook (ACH). Wind tunnel tests on a model-scale configuration showed a growing roll-yaw limit cycle oscillation in forward flight with a progressive shifting of the load from the rear hook to the forward hook as the speed increased and eventual rear cable slackening. A simulation model of the full-scale load-suspension configuration was developed and achieved good agreement with the wind tunnel results after including the nonlinear stretching properties of the test cables and accounting for the unsteady aerodynamics of the CONEX. A lateral ACH controller design based on the linearized simulation model showed good load stabilization performance using lagged load attitude feedback. Load distribution to the two hooks could be controlled by cable length adjustments at the rear hook.

iniciativa surge al identificar que la mayoría de los niños (as) tienen dificultades para comunicar su pensamiento por escrito, posteriormente, planea un proyecto comunitario a fin de identificar los problemas que enfrentan al escribir y sus áreas de oportunidad docentes en la planeación, producción y revisión de textos. Los resultados a los que llega es que los niños presentan dificultad en tres aspectos específicos: la creatividad y autonomía para producir textos propios, la ortografía y cohesión de las ideas. Las principales conclusiones se centran en la necesidad de reflexionar y mejorar la práctica para propiciar en el aula experiencias significativas que ayuden a los alumnos a escribir creativamente diversos tipos de textos. Autonomía, Cohesión de ideas, Escritura creativa, Proyectos comunitarios y Revisión ortográfica.

O processo de alfabetização acontece de duas maneiras: na forma de letramento e na aquisição do código de leitura e escrita. Desta forma o objetivo deste estudo é desenvolver uma proposta de sequência didática de alfabetização, utilizando o gênero textual música, a fim de que o aluno seja alfabetizado por meio da utilização de gêneros textuais, que contemple estes dos dois processos. A metodologia utilizada é a pesquisa qualitativa, pautado em autores que discutem o tema. A opção por um trabalho com gêneros textuais deve-se ao fato de que os mesmos são utilizados no dia a dia das pessoas, e os alunos sentem-se estimulados a querer ler os mesmos no seu dia a dia. Para atingir o objetivo, em um primeiro momento define e diferencia os conceitos de alfabetização e letramento. Na sequência discute a relação entre os gêneros textuais e a alfabetização, refletindo sobre a importância da organização do trabalho pedagógico em uma perspectiva de letramento. Por fim propõe algumas formas de alfabetizar letrando, utilizando o gênero textual música. A música é uma das quatro linguagens da disciplina Arte, sendo assim, deve ser utilizada de forma interdisciplinar, possibilitando desenvolver nos alunos do Ensino Fundamental a leitura e a escrita, além da estética e o sentimento.

Los grupos de escritura son valiosos espacios de acompañamiento de investigadores en formación, gracias a las dinámicas colaborativas entre pares que surgen en su interior. Una de ellas es la revisión de avances de textos, en la que se construye un andamiaje cognitivo y una red de soporte social para los escritores nóveles, como es el caso de los tesistas de programas de posgrado. Para conocer más sobre la eficacia de esa colaboración, en el presente estudio exploramos las características de los comentarios brindados por pares revisores, tesistas de nivel maestría, en un grupo de este tipo, identificado como círculo de escritura de tesis. Analizamos las características de foco y función de los comentarios escritos locales y globales en la revisión asincrónicas de los avances de tesis compartidos en una nube del ciberespacio, y comparamos esas características con las de los comentarios orales intercambiados en sesiones sincrónicas. Asimismo, observamos si los revisores fundamentan o no sus comentarios dependiendo de la modalidad, escrita u oral, o del alcance, local o global, sobre los textos revisados. Encontramos que solo la mitad de los comentarios escritos locales fueron fundamentados, en cambio se fundamentó la gran mayoría de los comentarios globales, escritos y orales. Los comentarios escritos, independientemente de su alcance, se enfocaron en aspectos formales y estructurales, mientras que en los comentarios orales se diversificó el foco de atención. La función directiva implícita fue la más usada en todos los tipos de comentarios, y en los comentarios globales también destacó la función apreciativa.

Investigating the outcomes of a surgical approach to treat isolated defects of the stapes suprastructure, using a modified total ossicular replacement prosthesis (TORP) prosthesis as a PORP between the footplate and the incus, effectively creating a TORP-PORP configuration. Eleven patients (mean age, 37.2 years; 36% male and 64% female) between the years 2007 and 2022. Therapeutic (ossiculoplasty). Hearing gain (in dB) in air conduction thresholds at 0.5, 1, 2, 3, and 4 kHz, stability of bone conduction, revision rate. Significant improvement in air conduction between the preoperative and the postoperative cohorts (p = 0.002) with a mean postoperative hearing level of 30.00 ± 5.25 dB. The bone conduction remained stable. We encountered no perioperative complications, and there were no revisions surgery. The described ossiculoplasty procedure is a safe and effective approach to treat isolated defects of the stapes suprastructure.

To improve estimation of cochlear implant (CI) insertion depth in postoperative skull x-rays using synthesized information from preoperative CT scans. Retrospective cohort. Tertiary referral center. Ten adult cochlear implant recipients with preoperative and postoperative temporal bone computed tomography (CT)scans and postoperative skull x-ray imaging. Postoperative x-rays and digitally reconstructed radiographs (DRR) from preoperative CTs were registered using 3D Slicer and MATLAB to enhance localization of the round window and modiolus. Angular insertion depth (AID) was estimated in unmodified and registration-enhanced x-rays and DRRs in the cochlear view. Linear insertion depth (LID) was estimated in registered images by two methods that localized the proximal CI electrode or segmented the cochlea. Ground truth assessments were made in postoperative CTs. Errors of insertion depth estimates were calculated relative to ground truth measurements and compared with paired t t ests. Pearson correlation coefficient was used to assess inter-rater reliability of two reviewer's measurements of AID in unmodified x-rays. In postoperative x-rays, AID estimation errors were similar with and without registration enhancement (-1.3 ± 20.7° and -4.8 ± 24.9°, respectively; mean ± SD; p = 0.6). AID estimation in unmodified x-rays demonstrated strong interrater agreement (ρ = 0.79, p < 0.05) and interrater differences (-15.0 ± 35.3°) comparable to estimate errors. Registering images allowed measurement of AID in the cochlear view with estimation errors of 14.6 ± 30.6° and measurement of LID, with estimate errors that were similar between proximal electrode localization and cochlear segmentation methods (-0.9 ± 2.2 mm and -2.1 ± 2.7 mm, respectively; p = 0.3). 2D-3D image registration allows measurement of AID in the cochlear view and LID using postoperative x-rays and preoperative CT imaging. The use of this technique may reduce the need for postimplantation CT studies to assess these metrics of CI electrode position. Further work is needed to improve the accuracy of AID assessment in the postoperative x-ray view with registered images compared with established methods.

Editora Direitos para esta edição cedidos à Atena Editora pelos autores. Open access publication by Atena Editora Todo o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição-Não-Comercial-NãoDerivativos 4.0 Internacional (CC BY-NC-ND 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores, inclusive não representam necessariamente a posição oficial da Atena Editora. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterála de nenhuma forma ou utilizá-la para fins comerciais. Todos os manuscritos foram previamente submetidos à avaliação cega pelos pares, membros do Conselho Editorial desta Editora, tendo sido aprovados para a publicação com base em critérios de neutralidade e imparcialidade acadêmica. A Atena Editora é comprometida em garantir a integridade editorial em todas as etapas do processo de publicação, evitando plágio, dados ou resultados fraudulentos e impedindo que interesses financeiros comprometam os padrões éticos da publicação. Situações suspeitas de má conduta científica serão investigadas sob o mais alto padrão de rigor acadêmico e ético.