5,201 research outputs found
Author Correction: Dental anomaly detection using intraoral photos via deep learning (Scientific Reports, (2022), 12, 1, (11577), 10.1038/s41598-022-15788-1)
No full textIn the original version of this Article Ronilo Ragodos, Tong Wang and Brian J. Howe were omitted as equally contributing authors. Tong Wang was omitted as an additional corresponding author. Correspondence and requests for materials should also be addressed to [email protected]. In addition, the Author Contributions section in this Article was incorrect.Fil: Ragodos, Ronilo. University of Iowa; Estados UnidosFil: Wang, Tong. University of Iowa; Estados UnidosFil: Padilla, Carmencita. University of the Philippines; FilipinasFil: Hecht, Jacqueline T.. University of Texas; Estados UnidosFil: Poletta, Fernando Adrián. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. CEMIC-CONICET. Centro de Educaciones Médicas e Investigaciones Clínicas "Norberto Quirno". CEMIC-CONICET; ArgentinaFil: Orioli, Ieda Maria. Universidade Federal do Rio de Janeiro; BrasilFil: Buxó, Carmen J.. Universidad de Puerto Rico; Puerto RicoFil: Butali, Azeez. University of Iowa; Estados UnidosFil: Valencia Ramirez, Consuelo. Clinica Noel; ColombiaFil: Restrepo Muñeton, Claudia. Clinica Noel; ColombiaFil: Wehby, George. University of Iowa; Estados UnidosFil: Weinberg, Seth M.. University of Pittsburgh; Estados Unidos. University of Pittsburgh at Johnstown; Estados UnidosFil: Marazita, Mary L.. University of Pittsburgh at Johnstown; Estados Unidos. University of Pittsburgh; Estados UnidosFil: Moreno Uribe, Lina M.. University of Iowa; Estados UnidosFil: Howe, Brian J.. University of Iowa; Estados Unido
Parámetros de avaliação para projetos com melhor aproveitamento de uso
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em ArquiteturaNa atualidade a totalidade de projetos habitacionais parte do principio absurdo do mínimo espaço para reduzir os custos da obra em lugar do utilizar um conceito do espaço necessário. Quase nenhum destes projetos leva em consideração o tamanho do mobiliário disponível no mercado. Isto cria uma incompatibilidade entre a necessidade espacial do usuário e a área disponível nas habitações de interesse social. Os resultados de uma construção com estas falhas entre outros são: O aumento dos custos para o morador que deve ampliar sua casa para poder utilizar o espaço com algo de conforto. A perda de flexibilidade de uso já que o espaço não permite variações no arranjo espacial. As habitações que não têm o equipamento necessário para sua utilização devido à falta de espaço para colocar o mobiliário. O congestionamento visual devido à aglomeração de móveis dentro de um cômodo criando desorganização e desconforto. A perda da privacidade pela carência de um espaço próprio. Os dormitórios sem utilidade durante o dia, que ficam lotados a noite. Como uma possível solução se propôs o conceito de um painel mobiliário o qual deveria contribuir com a facilidade de construção, montagem e pré-fabricação de um imóvel como alternativas para diminuir custos. Ao mesmo tempo este painel conteria o mobiliário necessário para a utilização dos diferentes cômodos e assim aproveitar ao máximo o incipiente espaço em projetos de habitação de interesse social. A fundamentação teórica deste painel foi realizada por meio de pesquisas sobre propostas de habitação social e projetos arquitetônicos que atendessem a princípios de produtos industrializados, assim como o levantamento dos problemas mencionados anteriormente. A realização prática se desenvolveu por meio de uma tabela que funciona como checklist e avaliam o conforto e habitabilidade destes projetos por meio da aplicação dos conceitos de flexibilidade, adaptabilidade e privacidade. Foi realizado também um levantamento de produtos existentes no mercado internacional que apresentam soluções inovadoras para espaços reduzidos tanto pela variedade de funções que o mesmo permite quanto pelas propostas de aproveitamento de espaço no transcurso do dia. Para testar tanto a tabela quanto a aplicabilidade do mobiliário pesquisado se utilizou como estudo de caso o protótipo desenvolvido pela ARQ-UFSC em colaboração com a empresa Battistella
FIGURE 3 in Mazzaella canaliculata comb. nov. based on Chondrus canaliculatus (Gigartinaceae, Rhodophyta) from Peru and Chile
No full textFIGURE 3. ML phylogenetic tree of COI sequences, showing the position of Mazzaella canaliculata comb. nov. from different localities of central Peru, along with other species of Mazzaella and genera of the family Gigartinaceae. The ML bootstrap support and Bayesian posterior priorities ≥ 50/0.5 are reported above and below the branches. The dash '-' indicates lower support values. Generatypes species are identified by an asterisk (*).Published as part of Arakaki, Natalia & Ramirez, Maria Eliana, 2021, Mazzaella canaliculata comb. nov. based on Chondrus canaliculatus (Gigartinaceae, Rhodophyta) from Peru and Chile, pp. 211-228 in Phytotaxa 497 (3) on page 220, DOI: 10.11646/phytotaxa.497.3.2, http://zenodo.org/record/542394
Type material of Arctiinae (Lepidoptera: Erebidae) in the collection of the Museo Argentino de Ciencias Naturales Bernardino Rivadavia (Buenos Aires Argentina)
No full textRodriguez-Ramirez, Joanna, Beccacece, Hernan Mario, Pinheiro, Lívia Rodrigues, Grados, Juan, Morono-Brizuela, Maria Lucila (2020): Type material of Arctiinae (Lepidoptera: Erebidae) in the collection of the Museo Argentino de Ciencias Naturales Bernardino Rivadavia (Buenos Aires Argentina). Zootaxa 4742 (3): 442-466, DOI: https://doi.org/10.11646/zootaxa.4742.3.
La representación entre el yo y el nosotros: Cantos y relatos del desplazamiento en Colombia
No full textDesign of a rowing motion assistance system for individuals with T7 spinal cord injury
No full textLas personas con lesión medular tienen una capacidad limitada para moverse durante el ejercicio de remo. Aunque la electroestimulación puede proporcionar cierta ayuda en este proceso, no consigue un movimiento completo. Por este motivo, se ha diseñado un sistema de asistencia al movimiento de remo para personas con lesión medular t7, que consiste en una silla ergonómica que se ajusta a las necesidades del usuario y un mecanismo de desplazamiento que optimiza la eficiencia del movimiento.Durante el proceso de diseño, se han evaluado las cargas máximas que soportará la silla para garantizar su resistencia y durabilidad. Además, se ha desarrollado un modelo matemático basado en la literatura para evaluar las capacidades del motor a utilizar. Finalmente, se obtiene que el diseño puede ser implementado en la máquina Concept2, cumpliendo con los parámetros de diseño establecidos.People with spinal cord injury have limited ability
to move during rowing exercise. Although electrostimulation can
provide some support in this process, it does not accomplish full
range of motion. Hence, a rowing movement assistance system for
people with spinal cord injury t7 has been designed, which consists
of an ergonomic chair that adjusts to the user's needs and a
displacement mechanism that optimizes movement efficiency.
During the design process, the maximum loads that the chair will
support have been evaluated in order to guarantee its resistance
and durability. In addition, a mathematical model based on
literature has been developed to evaluate the capabilities of the
motor to be used. Finally, it is obtained that the design can be
implemented in the Concept2 machine, complying with the
established design parameters.Universidad Militar Nueva GranadaI. Introducción
II. Materiales y métodos
A.Requerimientos de usuario para el diseño de la silla
ergonómica
B. Componentes de la silla ergonómica
C. Requerimientos de usuario para el diseño del sistema de
movimiento lineal
D. Componentes del sistema de movimiento lineal
a. Sistema de transmisión
b. Modelo matemático del motorreductor
E. Requerimientos de usuario para el diseño del mecanismo
de acople silla –riel
F. Análisis de elementos Finitos
III. RESULTADOS Y DISCUSIÓN
IV. CONLUSIONES
REFERENCIASPregradoLes personnes souffrant de lésions de la moelle épinière ont une capacité limitée à bouger pendant les exercices d'aviron. Bien que l'électrostimulation puisse apporter un certain soutien dans ce processus, elle ne permet pas d'obtenir une gamme complète de mouvements. C'est pourquoi un système d'assistance au mouvement d'aviron pour les personnes souffrant de lésions de la moelle épinière t7 a été conçu, qui consiste en une chaise ergonomique qui s'adapte aux besoins de l'utilisateur et en un mécanisme de déplacement qui optimise l'efficacité du mouvement. En outre, un modèle mathématique basé sur la littérature a été développé pour évaluer les capacités du moteur à utiliser. Enfin, il a été obtenu que la conception puisse être mise en œuvre dans la machine Concept2, en respectant les paramètres de conception établis
Control and optimization strategies for noise transmission reduction in sonic crystal acoustic barriers
No full textAcoustic metamaterials, such as Sonic Crystals (SC), are periodic artificial structures designed to manipulate sound waves in ways that natural materials cannot. These materials consist of arranged lattices of rigid scatterers embedded in air and exhibit unique properties, such as negative refraction and Band Gaps (BG), which can be leveraged to create highly effective noise control solutions. These Band Gaps prevent transmission of certain frequency ranges depending on the angle of incidence the sound waves relative to the crystal, making them ideal for applications in noise barriers and other acoustic devices.
This research investigates the potential of these advanced materials to enhance the performance of noise reduction devices through innovative design and optimization strategies aimed at minimizing unwanted sound, thereby improving the acoustic environment in various settings. Specifically, among noise reduction devices such as barriers, absorbers, and diffusers, this thesis focuses on Sonic Crystal Noise Barriers (SCNB).
The design and optimization of these devices require a deep understanding of acoustic principles and the ability to predict how sound interacts with different materials and structures. This is achieved through the use of simulations that forecast the behavior and performance of these devices, thus saving time and resources by avoiding the need to manufacture and experimentally test multiple prototypes before arriving at the optimal solution for each specific case.
In line with this, the thesis explores the potential of Active Noise Control (ANC) systems enhanced with Reinforcement Learning (RL) techniques as a complement to improve SCNBs. By integrating reinforcement learning, the study aims to develop ANC systems that continuously learn and adapt to changing environmental conditions, providing a dynamic and adaptive approach to noise control, particularly at low frequencies, where active control is most effective, and where SCNBs tend to be less efficient.
In addition to ANC, Helmholtz Resonators (HR) are incorporated to improve these barriers. By combining numerical methods and optimization algorithms, not only is the performance of SCNBs found in the literature improved, but a deeper understanding of the physical principles governing them and their interaction with HR is also achieved. 3D printing technology, used in architectural engineering, combined with parametric modeling, greatly increases the versatility in the creation of prototypes resulting from optimizations with HRs.
This thesis also addresses the insulation capabilities of SCNBs made from cylindrical scatterers with multiple Helmholtz resonators, proposing a design that incorporates two Helmholtz resonators per scatterer. This design shows a significant increase in Insertion Loss (IL) compared to conventional barriers. Additionally,examining the interaction between the BGs of HRs and Bragg-BGs, this thesis proposes new transmission applications for multiresonant SCs beyond noise barriers. The ability to control transmission through an active metamaterial by rotating the scatterers provides an advantage over conventional passive metamaterials.
Furthermore, the thesis explores, both numerically and experimentally, wave incidence measurements to further refine noise control strategies. Prototypes designed to mitigate tonal noise, such as that produced by train braking, are experimentally tested under both normal incidence and diffuse incidence of sound waves on the SCNB.
In summary, this doctoral thesis provides a comprehensive exploration of SCNBs, from design and optimization to practical applications. It delves into the phenomenology of the interactions between these periodic materials, ANC, HRs, and 3D printing. By integrating advanced optimization techniques and reinforcement learning, the study aims to improve current noise control solutions
Analysis of ecosystem services provision in the Colombian Amazon using participatory research and mapping techniques
No full textOver the last two decades indigenous peoples in the lower Caquetá River basin in Colombia have experienced detrimental changes in the provision of important ecosystem services in ways that have significant implications for the maintenance of their traditional livelihoods. To assess these changes we conducted eight participatory mapping activities and convened 22 focus group discussions. We focused the analysis on two types of change: (1) changes in the location of ecosystem services provisioning areas and (2) changes in the stock of ecosystem services. The focal ecosystem services include services such as provision of food, raw materials and medicinal resources. Results from the study show that in the past two decades the demand for food and raw materials has intensified and, as a result, locations of provisioning areas and the stocks of ecosystem services have changed. We found anecdotal evidence that these changes correlate well with socio-economic factors such as greater need for income generation, change in livelihood practices and consumption patterns. We discuss the use of participatory mapping techniques in the context of marginalized and data-poor regions. We also show how this kind of information can strengthen existing ecosystem-based management strategies used by indigenous peoples in the Colombian Amazon
La cesión de trabajadores por Empresas de Trabajo Temporal en el contexto europeo: las justificaciones y las prohibiciones
No full textNell'articolo si esamina in chiave comparata la disciplina delle giustificazioni e dei divieti al ricorso al lavoro tramite agenzia interinale in Italia e Spagna
Imaginarios de lo real y territorios de la autoconciencia en Desterrados de Eduardo Antonio Parra
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