Book.
1957 - Gale Group | World Scholar Latin America
Michael A. Nelson, Ram D. Singh,
... 2016).https://doi.org/10.2139/ssrn.2861505António Afonso, João Tovar Jalles How Does Fiscal Policy Affect Investment? ... 327.https://doi.org/10.1002/ijfe.1518António Afonso, João Tovar Jalles Fiscal composition and long-term growth, ... https://doi.org/10.4236/me.2014.51012António Afonso, João Tovar Jalles Growth and productivity: The role of ... org/10.1016/j.iref.2012.07.004Antonio Afonso, João Tovar Jalles The Fiscal-Growth Nexus, SSRN Electronic ... 142–160.https://doi.org/10.1108/03068291211188910Antonio Afonso, João Tovar Jalles Growth and Productivity: The Role of ...
Tópico(s): Monetary Policy and Economic Impact
1994 - University of Chicago Press | Economic Development and Cultural Change
... https://doi.org/10.1080/23322039.2017.1338851António Afonso, João Tovar Jalles How Does Fiscal Policy Affect Investment? ... org/10.1016/j.jeconbus.2010.10.001Antonio Afonso, João Tovar Jalles Linking Investment and Fiscal Policies, SSRN ...
Tópico(s): Monetary Policy and Economic Impact
1994 - University of Chicago Press | Economic Development and Cultural Change
... https://doi.org/10.1111/1467-8268.12222António Afonso, João Tovar Jalles How Does Fiscal Policy Affect Investment? ... https://doi.org/10.4236/me.2012.36093Antonio Afonso, João Tovar Jalles Linking Investment and Fiscal Policies, SSRN ...
Tópico(s): Energy, Environment, and Transportation Policies
1993 - University of Chicago Press | Economic Development and Cultural Change
Olivier Blanchard, Stanley Fischer,
... 18775/ijmsba.1849-5664-5419.2014.33.1003Antonio Afonso, João Tovar Jalles Assessing Fiscal Episodes, SSRN Electronic Journal ( ...
Tópico(s): Fiscal Policy and Economic Growth
1990 - University of Chicago Press | NBER Macroeconomics Annual
Pedro Pereira, Miguel Mascarenhas, Tiago Ribeiro, João Afonso, João Ferreira, Filipe Vilas‐Boas, Marco Parente, Renato Natal Jorge, Guilherme Macedo,
Background and study aims Indeterminate biliary strictures pose a significative clinical challenge. Dilated, irregular, and tortuous vessels, often described as tumor vessels, are frequently reported in biliary strictures with high malignancy potential during digital single-operator cholangioscopy (D-SOC). In recent years, the development of artificial intelligence (AI) algorithms for application to endoscopic practice has been intensely studied. We aimed to develop an AI algorithm for automatic detection ...
Tópico(s): Esophageal and GI Pathology
2022 - Thieme Medical Publishers (Germany) | Endoscopy International Open
Miguel Mascarenhas, Tiago Ribeiro, João Afonso, João Ferreira, Hélder Cardoso, Patrícia Andrade, Marco Parente, Renato Natal Jorge, Miguel Mascarenhas, Guilherme Macedo,
Background and study aims Colon capsule endoscopy (CCE) is a minimally invasive alternative to conventional colonoscopy. However, CCE produces long videos, making its analysis time-consuming and prone to errors. Convolutional neural networks (CNN) are artificial intelligence (AI) algorithms with high performance levels in image analysis. We aimed to develop a deep learning model for automatic identification and differentiation of significant colonic mucosal lesions and blood in CCE images. Patients ...
Tópico(s): Gastric Cancer Management and Outcomes
2022 - Thieme Medical Publishers (Germany) | Endoscopy International Open
Miguel Mascarenhas, Tiago Ribeiro, João Afonso, João Ferreira, Hélder Cardoso, Patrícia Andrade, Marco Parente, Renato Natal Jorge, Guilherme Macedo,
Capsule endoscopy has revolutionized the management of patients with obscure gastrointestinal bleeding. Nevertheless, reading capsule endoscopy images is time-consuming and prone to overlooking significant lesions, thus limiting its diagnostic yield. We aimed to create a deep learning algorithm for automatic detection of blood and hematic residues in the enteric lumen in capsule endoscopy exams.A convolutional neural network was developed based on a total pool of 22,095 capsule endoscopy images ( ...
Tópico(s): Gastric Cancer Management and Outcomes
2021 - Karger Publishers | GE Portuguese Journal of Gastroenterology
Jose P. Martins, João C. Ferreira, Vítor Monteiro, José A. Afonso, João L. Afonso,
In this research work, we apply the Internet of Things (IoT) paradigm with a decentralized blockchain approach to handle the electric vehicle (EV) charging process in shared spaces, such as condominiums. A mobile app handles the user authentication mechanism to initiate the EV charging process, where a set of sensors are used for measuring energy consumption, and based on a microcontroller, establish data communication with the mobile app. A blockchain handles financial transitions, and this approach ...
Tópico(s): Green IT and Sustainability
2019 - Multidisciplinary Digital Publishing Institute | Energies
João C. Ferreira, Vítor Monteiro, José A. Afonso, João L. Afonso,
This paper presents the project of a mobile cockpit system (MCS) for smartphones, which provides assistance to electric bicycle (EB) cyclists in smart cities' environment. The presented system introduces a mobile application (MCS App) with the goal to provide useful personalized information to the cyclist related to the EB's use, including EB range prediction considering the intended path, management of the cycling effort performed by the cyclist, handling of the battery charging process, and the provisioning ...
Tópico(s): Smart Parking Systems Research
2015 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Industrial Informatics
Vítor Monteiro, José A. Afonso, João C. Ferreira, João L. Afonso,
Nowadays, concerns about climate change have contributed significantly to changing the paradigm in the urban transportation sector towards vehicle electrification, where purely electric or hybrid vehicles are increasingly a new reality, supported by all major automotive brands. Nevertheless, new challenges are imposed on the current electrical power grids in terms of a synergistic, progressive, dynamic and stable integration of electric mobility. Besides the traditional unidirectional charging, ...
Tópico(s): Wireless Power Transfer Systems
2018 - Multidisciplinary Digital Publishing Institute | Energies
José Diogo Neves dos Santos, Susana Afonso João, Jesús Martı́n, Francisca Vicente, Fernando Reyes, Olga Maria Lage,
Oceans hold a stunning number of unique microorganisms, which remain unstudied by culture-dependent methods due to failures in establishing the right conditions for these organisms to grow. In this work, an isolation effort inspired by the iChip was performed using marine sediments from Memoria beach, Portugal. The isolates obtained were identified by 16S rRNA gene analysis, fingerprinted using BOX-PCR and ERIC-PCR, searched for the putative presence of secondary metabolism genes associated with ...
Tópico(s): Marine Sponges and Natural Products
2022 - Multidisciplinary Digital Publishing Institute | Microorganisms
Tiago Ribeiro, Miguel Mascarenhas, João Afonso, João Ferreira, Filipe Vilas‐Boas, Marco Parente, Renato Natal Jorge, Pedro Pereira, Guilherme Macedo,
Characterization of biliary strictures is challenging. Papillary projections (PP) are often reported in biliary strictures with high malignancy potential during digital single-operator cholangioscopy. In recent years, the development of artificial intelligence (AI) algorithms for application to endoscopic practice has been intensely studied. We aimed to develop an AI algorithm for automatic detection of PP in digital single-operator cholangioscopy images.A convolutional neural network (CNN) was developed. ...
Tópico(s): Pancreatic and Hepatic Oncology Research
2021 - Lippincott Williams & Wilkins | Clinical and Translational Gastroenterology
Miguel Mascarenhas, Francisco Mendes, Tiago Ribeiro, João Afonso, Pedro Cardoso, Miguel Martins, Hélder Cardoso, Patrícia Andrade, João Ferreira, Miguel Mascarenhas, Guilherme Macedo,
Capsule endoscopy (CE) is a minimally invasive examination for evaluating the gastrointestinal tract. However, its diagnostic yield for detecting gastric lesions is suboptimal. Convolutional neural networks (CNNs) are artificial intelligence models with great performance for image analysis. Nonetheless, their role in gastric evaluation by wireless CE (WCE) has not been explored.Our group developed a CNN-based algorithm for the automatic classification of pleomorphic gastric lesions, including vascular ...
Tópico(s): Gastrointestinal Tumor Research and Treatment
2023 - Lippincott Williams & Wilkins | Clinical and Translational Gastroenterology
Vítor Monteiro, Carlos Moreira, João Peças Lopes, Carlos Henggeler Antunes, Gerardo J. Osório, João P. S. Catalào, João L. Afonso,
The decarbonization of the economy and the increasing integration of renewable energy sources into the generation mix are bringing new challenges, requiring novel technological solutions in the topic of smart grids, which include smart transformers and energy storage systems. Additionally, power quality is a vital concern for the future smart grids; therefore, the continuous development of power electronics solutions to overcome power quality problems is of the utmost importance. In this context, ...
Tópico(s): Advanced Battery Technologies Research
2023 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Industrial Electronics
António Afonso, João Tovar Jalles, Ana Venâncio,
We provide a novel set of government spending efficiency scores for the OECD countries and then assess to what extent capital markets perceive government efficiency increases (decreases) as part of the determinants of sovereign rating decisions. Public efficiency scores are computed via data envelopment analysis. Then, we rely notably on ordered response models to estimate the response of sovereign ratings to changes in efficiency scores. Covering 35 OECD countries over the period 2007–2020, we find ...
Tópico(s): Monetary Policy and Economic Impact
2022 - Elsevier BV | Journal of International Financial Markets Institutions and Money
Produção Nacional
Revisado por pares
Afonso F. João, Lucas V. de Faria, David Ramos, Raquel G. Rocha, Eduardo M. Richter, Rodrigo A.A. Muñoz,
• Additively manufactured sensor for naproxen detection in water, urine or drugs. • 3D printed carbon-black polylactic electrodes assembled in a 3D printed cell. • Amperometric detection of naproxen in the micromolar range (LOD = 0.5 µmol L -1 ). • Free of the interference from glucose, urea and drugs classified as emerging contaminants. • High sample throughput (105 h −1 ), precision (5%) and accuracy (recovery from 88 to 105%). Additive manufacturing has emerged as an innovative technology for the large-scale development of low- ...
Tópico(s): Analytical Chemistry and Sensors
2022 - Elsevier BV | Microchemical Journal
João Afonso, Miguel Mascarenhas, João Ferreira, Hélder Cardoso, Tiago Ribeiro, Patrícia Andrade, Marco Parente, Renato Natal Jorge, Guilherme Macedo,
Tópico(s): Gastric Cancer Management and Outcomes
2022 - Springer Science+Business Media | Medical & Biological Engineering & Computing
Produção Nacional
Revisado por pares
Afonso F. João, Raquel G. Rocha, Tiago A. Matias, Eduardo M. Richter, João Flávio da Silveira Petruci, Rodrigo A.A. Muñoz,
Atropine is a natural tropane alkaloid extracted from plants of the family Solanaceae and usually employed for medicinal purposes. Due to its action toward the acetylcholine receptors, atropine can be also used in criminal activities by poisoning beverages. Three-dimensional (3D) printing technology has become popular in electrochemistry as it provides low-cost electrodes in varied designs using conductive filaments. In this work, we demonstrated that 3D-printed graphene-polylactic acid (graphene- ...
Tópico(s): 3D Printing in Biomedical Research
2021 - Elsevier BV | Microchemical Journal
António Afonso, João Tovar Jalles, Ana Venâncio,
We empirically assess the effects of structural tax reforms on government spending efficiency in a sample of 18 OECD economies over the period 2006–2017. After calculating input spending efficiency scores, we evaluate in a panel setup the relevance for public sector efficiency of narrative tax changes. We find that: i) input efficiency scores average around 0.6–07; ii) increases in tax rates, primarily for PIT, negatively affect public sector efficiency; iii) controlling for endogeneity, increases ...
Tópico(s): Taxation and Compliance Studies
2021 - Springer Science+Business Media | Open Economies Review
Miguel Mascarenhas, João Afonso, Tiago Ribeiro, João Ferreira, Hélder Cardoso, Ana Patrícia Andrade, Marco Parente, Renato Natal Jorge, Miguel Mascarenhas, Guilherme Macedo,
Objective Capsule endoscopy (CE) is pivotal for evaluation of small bowel disease. Obscure gastrointestinal bleeding most often originates from the small bowel. CE frequently identifies a wide range of lesions with different bleeding potentials in these patients. However, reading CE examinations is a time-consuming task. Convolutional neural networks (CNNs) are highly efficient artificial intelligence tools for image analysis. This study aims to develop a CNN-based model for identification and differentiation ...
Tópico(s): Gastric Cancer Management and Outcomes
2021 - BMJ | BMJ Open Gastroenterology
Produção Nacional
Revisado por pares
Jian F.S. Pereira, Raquel G. Rocha, Sílvia V.F. Castro, Afonso F. João, Pedro H. S. Borges, Diego P. Rocha, Abner de Siervo, Eduardo M. Richter, Edson Nossol, Rogério Valentim Gelamo, Rodrigo A.A. Muñoz,
Conductive 3D-printed platforms have been recognized an emerging class of materials with great potential to electrochemistry. However, such 3D-printed electrodes require a surface treatment to remove excess of polymer that hinders the electron transfer. We report a fast (2-min) and chemical-free protocol for the surface treatment of 3D-printed conductive electrodes based on reactive cold oxygen plasma. A dramatic improvement of electrochemical activity of 3D-printed carbon black-polylactic acid (CB- ...
Tópico(s): Electrochemical Analysis and Applications
2021 - Elsevier BV | Sensors and Actuators B Chemical
António Afonso, João Tovar Jalles, Ana Venâncio,
This paper evaluates the relevance of taxation for public spending efficiency in a sample of OECD economies for the period of 2003–2017. We start by computing the data envelopment analysis (DEA) scores, and then we evaluate the role of tax structure in explaining these public efficiency scores, using a reduced-form panel data regression specification. Our main findings are as follows: inputs could be theoretically lower by approximately 32–34% and expenditure efficiency is negatively associated with ...
Tópico(s): Fiscal Policies and Political Economy
2021 - Palgrave Macmillan | Comparative Economic Studies
Rohan P. Naidu, Jorryt Matthee, Pascal A. Oesch, Charlie Conroy, David Sobral, Gabriele Pezzulli, Matthew Hayes, Dawn K. Erb, R. Amorín, Max Grönke, D. Schaerer, Sandro Tacchella, Josephine Kerutt, Ana Paulino-Afonso, João Calhau, Mario Llerena, H. J. A. Röttgering,
The ionizing photon escape fraction (LyC $f_{\rm{esc}}$) of star-forming galaxies is the single greatest unknown in the reionization budget. Stochastic sightline effects prohibit the direct separation of LyC leakers from non-leakers at significant redshift. Here we circumvent this uncertainty by inferring $f_{\rm{esc}}$ with resolved (R>4000) LyA profiles from the X-SHOOTER LyA survey at z=2 (XLS-z2). We select leakers ($f_{\rm{esc}}>20$%) and non-leakers ($f_{\rm{esc}} 0.2 L^{*}$ LyA emitters (LAEs). With ...
Tópico(s): Astrophysics and Star Formation Studies
2021 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
António Afonso, João Tovar Jalles, Mina Kazemi,
We assess the impact of announcements corresponding to different fiscal and monetary policy measures on 10-year sovereign bond yield spreads (relative to Germany) of 10 EMU countries during the period 01:1999-07:2016. Implementing country-fixed effects OLS regressions, we find that the European Commission’s (EC) releases of the excessive deficit procedure significantly affect yield spreads. The EC releases of higher debt and better budget balance forecasts contribute to the rise and the decline of ...
Tópico(s): Monetary Policy and Economic Impact
2020 - Elsevier BV | International Review of Law and Economics
Ana Afonso, João Loureiro, Juan Arroyo, Erika Olmedo-Vicente, Sílvia Castro,
Abstract Polyploidy plays a significant role in the evolution and diversification of flowering plants. In several polyploid complexes, high morphological variability and plasticity coupled with cytogenetic diversity make it difficult to disentangle their evolutionary history. The main goal of this study was to gain insights into the role of whole genome duplications as one of the factors shaping the evolution of flowering plants. Linum suffruticosum s.l. has been described as a polyploid complex, ...
Tópico(s): Plant Disease Resistance and Genetics
2020 - Oxford University Press | Botanical Journal of the Linnean Society
Produção Nacional
Revisado por pares
Afonso F. João, André L. Squissato, Eduardo M. Richter, Rodrigo A.A. Muñoz,
Tópico(s): Electrochemical sensors and biosensors
2020 - Springer Science+Business Media | Analytical and Bioanalytical Chemistry
Produção Nacional
Revisado por pares
Afonso F. João, Sílvia V.F. Castro, Rafael M. Cardoso, Raimundo R. Gamela, Diego P. Rocha, Eduardo M. Richter, Rodrigo A.A. Muñoz,
Tópico(s): Conducting polymers and applications
2020 - Elsevier BV | Journal of Electroanalytical Chemistry
António Afonso, João Tovar Jalles,
Abstract This paper assesses the effect of fiscal rules on sovereign bond spreads over the short and medium term, for 34 advanced countries and 19 emerging market economies, over the period 1980–2016. Our results, based on impulse response functions, show that the dynamic impact of fiscal rules on sovereign yield spreads is negative and statistically significant, at around 1.2–1.8 percentage points, implying lower government borrowing costs. This result stems essentially from the advanced economies ...
Tópico(s): Global Financial Crisis and Policies
2019 - Wiley | Fiscal Studies
Produção Nacional
Revisado por pares
Luiz Carlos Felix Ribeiro, Luis C. S. Afonso, João Paulo Papa,
Parkinson's Disease (PD) is a clinical syndrome that affects millions of people worldwide. Although considered as a non-lethal disease, PD shortens the life expectancy of the patients. Many studies have been dedicated to evaluating methods for early-stage PD detection, which includes machine learning techniques that employ, in most cases, motor dysfunctions, such as tremor. This work explores the time dependency in tremor signals collected from handwriting exams. To learn such temporal information, ...
Tópico(s): Voice and Speech Disorders
2019 - Elsevier BV | Computers in Biology and Medicine