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The influence of hydroxyapatite crystals on the viscoelastic behavior of poly(v...

Quinaz, Tiago Filipe Simões; Freire, Tânia F.; Olmos, Andrea Alexandra Rodrigues; Martins, Marcos; Ferreira, Fernando; Moura, Marcelo F. S. M. de

Composites of poly(vinyl alcohol) (PVA) in the shape of braids, in combination with crystals of hydroxyapatite (HAp), were analyzed to perceive the influence of this bioceramic on both the quasistatic and viscoelastic behavior under tensile loading. Analyses involving energy-dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) allowed us to conclude that the production of a homogeneous lay...


Navegantes das inquietações a respeito das formas possíveis de habitarmos o mun...

Martins, Marcos

Apresentando-se na paisagem, como natureza presentificada em terra, corpo-abrigo vestido de poesia, suspendido por escoras que equivalem a palafitas das memórias, mar debruçante de pés desnudos, flutuante de miras mar das frestas dos ventos que assobiam no horizonte em reconstrução, aportando nos desejos as inquietudes das formas possíveis de habitarmos no mundo Imantado, a natureza do corpo e do mundo. Barcos ...


Navegantes das inquietações a respeito das formas possíveis de habitarmos o mun...

Martins, Marcos

Apresentando-se na paisagem, como natureza presentificada em terra, corpo-abrigo vestido de poesia, suspendido por escoras que equivalem a palafitas das memórias, mar debruçante de pés desnudos, flutuante de miras mar das frestas dos ventos que assobiam no horizonte em reconstrução, aportando nos desejos as inquietudes das formas possíveis de habitarmos no mundo Imantado, a natureza do corpo e do mundo. Barcos ...


4-FSK High-Speed Underwater Acoustic Communication System

Araujo, Luis; Matos, Tiago; Cabral, José; Martins, Marcos

Oceans all over the world are an important way of sustainability in the lives of many people and have a high impact on the economy of most of the coastal countries. With the growth of underwater activity provided by the development of autonomous and remotely controlled vehicles and with the appearance of new underwater sensors, there is also a need to develop and design more robust underwater wireless networks ...


Design and in situ validation of low-cost and easy to apply anti-biofouling tec...

Matos, Tiago; Pinto, Vânia; Sousa, Paulo; Martins, Marcos; Fernández, Emilio; Henriques, Renato F.; Gonçalves, Luis Miguel

Biofouling is the major factor that limits long-term monitoring studies with automated optical instruments. Protection of the sensing areas, surfaces, and structural housing of the sensors must be considered to deliver reliable data without the need for cleaning or maintenance. In this work, we present the design and field validation of different techniques for biofouling protection based on different housing m...


Effect of PEDOT:PSS with secondary dopants and DBD plasma treatment on the cond...

Rodrigues, Rui Pedro Vieira; Magalhães, Cátia; Ribeiro, Ana Isabel Ferreira; Alves, Cátia Sofia Pereira; Fernandes, Marta Susana Machado

[Excerpt] Introduction Smart textiles have the capability to interact with the surrounding environment and react in different ways, namely in electrical conduction. The conductive properties of these materials are useful in medical, healthcare, and protective clothing.; This research was funded by FEDER funds through the Operational Competitiveness Program– COMPETE, under the projects POCI-01-0247-FEDER-068924,...


Submarine cables as precursors of persistent systems for large scale oceans mon...

Tieppo, Marcos; Pereira, Eduardo; Garcia, Laura Gonzalez; Rolim, Margarida; Castanho, Emanuel; Matos, Anibal; Silva, António; Ferreira, Bruno

Long-term and reliable marine ecosystems monitoring is essential to address current environmental issues, including climate change and biodiversity threats. The existing oceans monitoring systems show clear data gaps, particularly when considering characteristics such as depth coverage or measured variables in deep and open seas. Over the last decades, the number of fixed and mobile platforms for in situ ocean ...


Development of a high-power multilayer PVDF acoustic projector for 40 to 80 kHz...

Silva, António; Hughes, Ashley; Pozzatti, Daniel; Zabel, Friedrich; Viegas, Rúben; Martins, Marcos

A piston type projector using the PVDF piezoelectric polymer was developed for operating in underwater environment, below 100 kHz. For those frequencies PZT piezoelectric ceramic is usually a preferable choice and PVDF is only considered for frequencies above a few hundreds of kHz. This paper will show that efficient underwater acoustic projectors for frequencies below 100 kHz can be implemented regarding an ap...


O impacto social do crime de lavagem de capitais

Martins, Marcos

Trata se da abordagem ao crime de lavagem de dinheiro, com exposição dos impactos sociais.

Date: 2021   |   Origin: Oasisbr

The sharing of the common in the performance Contra X Tempo: Collaborative crea...

Fortes, Hugo; Peled, Yiftah; Martins, Marcos; Gomes, Tiago Cardoso; Magno, Luciana; Espírito Santo, Leandra; Fonseca, Síssi

This text presents reflections on the collaborative creation process of the collective performance Contra X  Tempo. The work consisted of seven performance actions created by the artists, which were performed concomitantly by each of the members in the same space. A kind of circuit was created, in which each artist performed an action for a certain time and then went on to perform another action proposed b...

Date: 2019   |   Origin: Oasisbr

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