1,754,059 research outputs found
Textile-based deployable structures and robotic systems for aerospace applications
Full text linkIn this PhD dissertation, we delve into the innovative developments across advanced manufacturing, origami-inspired solar panels and robotics across space exploration landscape.
The first chapter introduces FRET (Flexible Reinforced Electronics Textile), a technology enabler for deployable, origami-inspired aerospace systems. By combining rigid-flex PCB electronics and Nomex®, FRET addresses design challenges, providing robustness and resilience for reliable lightweight origami-inspired deployable structures. The research has been targeting manufacturing and testing of the FRET prototypes, where traction test have been performed to evaluate the quality of the FRET’s prototypes. Although the first results had shown room for improvement, especially on the bonding and the adhesive material selection, more work is on the way to validate material selection and bonding quality.
Moving on, the second chapter presents SolarCube, an origami-inspired, lightweight solar panel designed for nanosatellites. Fueled by the innovative FRET technology, SolarCube achieves an exceptional stowed-to-deployed surface ratio, promising advancements in lightweight, efficient solar panels. At the time of writing, SolarCube is at TRL 4, and a fully functional prototype is expected by the summer of 2024.
The third chapter focus on advancing the modelling of both FRET and SolarCube. For FRET modelling, the validation of key parameters in the PATRAN simulation environment involved a comparison with benchmark values derived from experimental traction tests on FRET samples. This validation process also incorporated a key performance index (KPI). Subsequently, the dynamic characteristics of SolarCube were explored by determining the first ten natural frequencies of the solar array, both in its closed and open configurations. The results revealed values within the anticipated range, aligning with the requirements specified in the user manual of the Ariane 5 spacecraft used as a reference. These analyses marked a significant advancement in modeling FRET, a challenging task given the limited prior studies on this technology.
The forth chapter highlights the author contribution in the development of the Electrical Ground Support Equipment (EGSE), also known as the "Blue Box", used for testing the Sampling Caching System of the Mars 2020 Perseverance rover. This modular EGSE system, deployed in various venues, proved vital in identifying and resolving anomalies, providing valuable insights for future implementations and reinforcing its role in the Verification and Validation (V&V) campaign. The paper presents circuit design, lesson learned and troubleshooting activities.
Finally, the fifth chapter discusses the research on autonomous robotics performed within the NASA-JPL Team CoSTAR achievements for the DARPA Subterranean Challenge, showcasing the NeBula autonomy solution. This uncertainty-aware framework has shown resilience and intelligent decision-making capabilities. NeBula's platform-agnostic components offer promising solutions for autonomous exploration in extreme environments, with ongoing efforts focused on future missions and applications beyond our planet. The author contribution in this research has been mainly on the hardware side, focusing on the development of the embedded electronics and software for the CoSTAR robots.
Collectively, these papers contribute to the advancement of robotics technology, origami-inspired structures, and space exploration, showcasing innovations in manufacturing, deployable mechanisms, solar panels, testing equipment, and autonomy solutions. The future trajectory involves addressing challenges, refining designs, and pushing the boundaries of technology for practical applications in space exploration and robotics
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
A grande reportagem do projeto Desenhando Sorrisos
Full text linkJournalism plays the social role of informing the population with commitment and responsibility. Day-to-day facts, stories and happenings have been explored with the mission of providing the public with the possibility of being credibly informed. Faced with this reality the journalistic reports fit a new standard, where information could be worked in a humanized way. In this context, the big story has become an important tool for portraying episodes without following the lead standards. Therefore, the present experimental project has as a plan of action the elaboration of a great report with humanized reports of the project "Drawing Smiles" in the city of Passo Fundo - RS. As a research method, the work relied on the field research to obtain the information used in the construction of the report. With the delivery of the projected activities to the project members, through the application of a questionnaire, there is a positive result in the improvement of the communication of the group, since the work delivered now serves as a documentary record of the work done by the volunteers.O jornalismo exerce o papel social de informar a população com comprometimento e responsabilidade. Fatos do dia a dia, histórias e acontecimentos passaram a ser explorados com a missão de proporcionar ao público a possibilidade de estar informado com credibilidade. Diante dessa realidade os relatos jornalísticos se adequaram a um novo padrão, onde as informações puderam ser trabalhadas de forma humanizada. Neste contexto, a grande reportagem passou a ser um instrumento importante para retratar episódios sem seguir os padrões do lead. Portanto, o presente projeto experimental tem como plano de ação a elaboração de uma grande reportagem com relatos humanizados do projeto “Desenhando Sorrisos” na cidade de Passo Fundo - RS. Como método de pesquisa, o trabalho contou com a pesquisa de campo para obtenção das informações utilizadas na construção da reportagem. Com a entrega das atividades projetadas aos integrantes do projeto, através da aplicação de um questionário, verifica-se um resultado positivo na melhora da comunicação do grupo, já que o trabalho entregue agora serve como um registro documental do trabalho prestado pelos voluntários
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
