60 documents found, page 1 of 6
Ethylene removal by Ag-based ZSM-5 adsorbents for the preservation of climacter...
Ferreira, R.; Lopes, H.; Lourenço, J. P.; Silva, J. M.; João, I. M.; Ribeiro, M. F.; Fernandes, A.Ethylene removal is crucial for fruits and vegetables preservation because even a very low concentration (<0.1ppm) can induce ripening during storage and transportation. Ag+ exchanged ZSM-5 zeolites were investigated as adsorbents for the efficient removal of ethylene. Two ZSM-5 materials (Si/Al ratios of 15 and 40), with different amounts of Ag (up to 6 % by weight) and two compensating cations, Na+ and H+, we...
Sailing uncharted waters with old boats? COVID-19 and the digitalization and pr...
Santana Pereira, J.; Lopes, H.; Nina, S. R.This article investigates the extent to which the COVID-19 pandemic fostered significant shifts in election campaigning. The argument is that COVID-19 might have had an impact on both digitalization and professionalization, which might have been regarded as necessary strategies to curb the difficulties brought about by the pandemic. We apply a most similar systems design with a threefold comparative scheme in o...
Party policy responsiveness at the agenda-setting and decision-making stages: T...
Belchior, A. M.; Lopes, H.; Cabrita, L.; Tsatsanis, E.To what extent are political parties responsive to voters before and after elections (that is, in campaign and in office)? And what explains responsiveness at both these stages: the agenda-setting and the decision-making stages? We argue that parties are more responsive at the agenda-setting stage than at the decision-making, and that responsiveness tends to be mediated by the type of promise (change versus sta...
Business as usual ou novo normal?: As campanhas presidenciais de 2021 em Portugal
Lopes, H.; Santana Pereira, J.; Nina, S.A crise pandémica criada pelo advento da covid-19 em finais de 2019 teve efeitos sociais e económicos consideráveis, mas também impactos políticos de variada natureza, incluindo em termos eleitorais (por exemplo, Baccini et al., 2021; Chirwa et al., 2022). Nos casos em que as eleições não foram adiadas por conta da situação pandémica, os partidos e os candidatos foram obrigados a lidar com a necessidade de real...
Influence of adhesive on optical fiber-based strain measurements on printed cir...
Freitas, C.; Leite, T. M.; Lopes, H.; Gomes, M.; Cruz, Sílvia Manuela Ferreira; Magalhães, R.; Ferreira da Silva, Alexandre; Viana, J. C.; Delgado, I.The use of optical fiber sensing for strain measurements on printed circuit boards is a recent approach, and there is a lack of f reliable methods to obtain valid strain measurements. This work investigates the influence of different adhesives and their application for strain measurements using optical fiber sensors on PCB, considering room and high temperature tests. Strain developed in PCB during production a...
Ethylene removal with metals-based zeolites for climacteric fruits preservation
Ferreira, R.; Lopes, H.; Fernandes, A.; Lourenço, João P.; Silva, J. M.; João, I. M.; Ribeiro, FilipaNowadays, there is a high importance of consuming fresh fruits and vegetables (F&V) in a well-balanced diet. One main issue concerning fruit preservation is ethylene molecule, a natural plant hormone that is responsible for fruits ripening and senescence. Thus, its removal from transportation and cold storage chambers is essential for industrial companies to prevent deterioration or spoilage of F&V and extend t...
Job polarisation: Capturing the effects of work organisation
Lopes, H.; Calapez, T.This article critically challenges the findings and assumptions of mainstream job polarisation literature. Based on the European Working Conditions Survey data and on the Job Demand-Control model, which allows for capturing the organisational dimension of jobs, we examine the patterns and evolution of occupations in 22 European countries from 2005 to 2015. Instead of pervasive job polarisation, we observe a nea...
FruitFlyProtec - Melhorar o combate a moscas da fruta por monitorização e avali...
Alexandre, P.; Mendonça, T.; Godinho, Maria; Valério, Elsa; Figueiredo, E.; Mexia, A.; Soares, C.; Tomé, D.; Neto, E.; Lopes, H.; Pica, M.C.FEADER e PDR2020
FruitFlyProtec - Melhorar o combate a moscas da fruta por monitorização e avali...
Alexandre, P.; Mendonça, T.; Godinho, M.; Valério, E.; Figueiredo, E.; Mexia, A.; Soares, C.; Tomé, D.; Neto, E.; Lopes, H.; Pica, M.C.Este projeto tem como objetivos: - Para Drosophila suzukii propõe-se (i) desenvolver métodos expeditos para monitorizar populações em diferentes condições ecológicas; (ii) identificar os principais fatores de risco como hospedeiros alternativos às culturas (repositórios); (iii) definir estratégias de proteção da cultura, em especial medidas preventivas e avaliação de eficácia de técnicas de captura em massa ou ...
The institutional and political ontology of the firm
Lopes, H.The paper begins by specifying that it examines the institutional ontology of the firm, not only that of the corporation. It views firms as structured cooperative endeavors, emergent entities ontologically irreducible to their composing elements that exist by virtue of two distinct kinds of institutions: i) cooperative behavioral norms that emerge from interpersonal interactions between workers and account for ...