70 documents found, page 1 of 7
A single-switch DC-DC converter with a high voltage gain capability and reduced...
Fernao Pires, Vitor; Cordeiro, Armando; Foito, Daniel; Monteiro, Joaquim; Silva, J. F.The growing trend toward high-efficiency, high gain converters that minimize component count, has spurred the development of many new step-up topologies. In this context introduces a new single-switch, non-isolated DC-DC step-up converter topology specifically designed for renewable energy applications. Key advantages of this topology include a high boost factor, continuous input current, reduced voltage stress...
Impacts of low-frequency noise from industrial sources in residential areas
Silva, Lígia Torres; Magalhães, Alda; Silva, J. F.; Fonseca, FernandoThe World Health Organisation classifies Low-frequency noise (LFN) as an environmental problem that causes various health impacts. Industrial sites and activities are among the various identified sources of LFN. However, industrial noise has been more studied on higher frequencies than lower frequencies. To fill this gap, this paper evaluates the impacts of LFN emitted by industrial sources in neighbouring resi...
Electric vehicle integrated battery charger for an AC drive with open windings
Fernão Pires, V.; Cordeiro, Armando; Foito, Daniel; Silva, J. F.Merging of electric vehicle (EV) charging converter within the EV motor drive allows to minimize the charging system regarding volume, weight, and cost. Thus, several integrated battery charger topologies have been presented for well known drives. However, very few works have been addressed for open windings motor drives. This work is focused on open windings motor drives and battery charger types, proposing a ...
Processing of pre-impregnated thermoplastic towpreg reinforced by continuous gl...
Asensio, M.; Esfandiari, Puria; Núñez, K.; Silva, J. F.; Marques, A.; Merino, J.C.; Pastor, J.M.Packaging sector generates 40% of the plastics consumption in Europe. Among the most consumed plastics, polyethylene terephthalate (PET) is still the material that undoubtedly continues to grow in the packaging sector. Hence, there is a concern related to the recycling process, which today is only around 56%. Therefore, the objective of this work focuses on the use of this recycled material as a source of raw m...
How the environment affects the residential property values?
Silva, Lígia Torres; Reis, C.; Oliveira, C.; Silva, J. F.The growth of the World?s population has been followed by the reinforcement of the population living in urban areas, which very often results in additional stress over space, ecosystems, infrastructures, facilities and the way of life. Domestic and industrial sources, and mainly motorized traffic are responsible for pollutant emissions and noise which decisively affects the living in today?s cities. Besides the...
Occupational health and safety-sustainable development and the changes in organ...
Reis, Cristina; Oliveira, Carlos; Braga, Paula; Silva, J. F.; Silva, Lígia TorresThe paper aims to demonstrate the interconnection between occupational hygiene and health, which is based on three main pillars: economy, environment and society, just as sustainable development is based on three major topics: people, planet and profit. Thus there must be strong OHS policies that encompass sufficient environmental programs to ensure workers are safe and thus ensure sustainability. Sustainable d...
Safety of containment of facades in urban rehabilitation works
Reis, C.; Oliveira, C.; Braga, P.; Silva, J. F.; Silva, Lígia TorresThis research purpose concerns a major challenge facing civil construction today: to promote, safely, the rehabilitation of historic centers. This problem occurs due to several factors, either due to the difficulty of removing debris from a work in historic centers, or because one does not know what the balance of some constructive elements is. Also often in buildings of historical areas is mandatory to maintai...
Assessing antimicrobial potential of agroindustrial byproducts' extracts produc...
Silva, J. F.; Serra, C. R.; Santos, R. A.; Oliva-Teles, A.; Fernandes, Helena; Filipe, D.; Belo, Isabel; Salgado, José Manuel Seara; Castro, C.[Excerpt] Sustainability is definitely the 21st century word. The future global food provision is dependent on fish and on sustainable expansion of aquaculture production. For that, alternative nutritional strategies for aquaculture disease management are required, reducing the use of synthetic drugs. Agroindustrial byproducts(brewery, winery and olive oil industry) constitute a circular and ecofriendly potenti...
Compression molding of pultruded carbon reinforced thermoplastic composites
Novo, P. J.; Nunes, J. P.; Silva, J. F.; Marques, A. T.Historically, thermoset resins have dominated the composite industry but they start to be replaced by thermoplastics. In this study two different thermoplastic matrix carbon reinforced pre-impregnated materials were used, one produced in our laboratories (towpreg) and another obtained from coextrusion process (PCT). Carbon fibre and two different thermoplastic matrices (polypropylene and PRIMOSPIRE®) were selec...
Influence of the use of manioc on its genetic diversity conservation in a quilo...
Oler, J. R. L. [UNESP]; Hoogerheide, E. S. S.; Pinto, J. M. A.; Tiago, A.; Silva, J. F.; Veasey, E. A.Made available in DSpace on 2020-12-10T20:02:14Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-07-30; Local cassava varieties play an important role in food security and the autonomy of subsistence farmers. They can be important resources for breeding and conservation programs. We examined the genetic diversity of cassava through ethnobotanical knowledge and microsatellite markers to understand the dyna...