36 documents found, page 1 of 4
On the stability of memory-dependent multi-agent systems under DoS attacks
Almeida, Ricardo; Girejko, Ewa; Machado, Luís; Malinowska, Agnieszka B.; Martins, NatáliaIn this paper, the stability analysis of memory-dependent multi-agent systems under Denial-of-Service attacks is conducted. The system under consideration is of fractional order, involving the Caputo derivative with respect to another function. Necessary and sufficient conditions for the positivity of the fractional linear system are provided. Moreover, a sufficient condition for asymptotic stability of positiv...
Comparison of different pretreatment processes envisaging the potential use of ...
Marques, Fabiana; Pereira, Francisco; Machado, Luís; Martins, Joana T.; Pereira, Ricardo N.; Costa, Monya; Genisheva, Zlatina; Pereira, HugoA significant fraction of the food produced worldwide is currently lost or wasted throughout the supply chain, squandering natural and economic resources. Food waste valorization will be an important necessity in the coming years. This work investigates the ability of food waste to serve as a viable nutritional substrate for the heterotrophic growth of Chlorella vulgaris. The impact of different pretreatments o...
A influência da participação no desporto escolar padel no desempenho das aptidõ...
Machado, LuísO documento que se segue, denominado de Relatório de Estágio, inserido no Mestrado em Educação Física nos Ensinos Básicos e Secundários do Instituto Superior de Estudos Interculturais e Transdisciplinares (ISEIT) de Almada tem como principal objetivo descrever e refletir todo o trabalho desenvolvido no momento da Prática de Ensino Supervisionada (PES), no ano letivo de 2022/2023. A PES foi realizada na Escola S...
Results of the first 1000 infra-renal aortic aneurysms included in the Portugue...
Nogueira, Clara; Coelho, Andreia; Gouveia e Melo, Ryan; Bastos Gonçalves, Frederico; Mendes Pedro, Luís; Quintas, Anita; Vaz, Carolina; Brandão, DanielINTRODUCTION: The Abdominal aortic aneurysm (AAA) module of the Portuguese National Vascular Registry (RNPV) is a prospective, voluntary, population-based registry, that encompasses more than 90% of portuguese vascular departments. The aim of this study was to evaluate the results of the first 1000 infra-renal AAA included in the Portuguese RNPV. METHODS: Data were collected from November 2019 to December 2022 ...
Conformational dynamics of soy protein isolate under ohmic heating
Machado, Luís; Carvalho, Gonçalo António Sousa; Rodrigues, Rui Miguel Martins; Teixeira, António; Vicente, A. A.; Pereira, Ricardo Nuno CorreiaOhmic heating (OH) brings a promise of sustainable thermal processing by assuring high levels of heating efficiency and reduction of water consumption. It is important to gather fundamental knowledge about the way how this emerging heating method technology can affect the biological, functional, and technological properties of important molecules such as proteins during food processing. Vegetable proteins are a...
Multi-agent systems with memories under DoS attacks
Almeida, Ricardo; Girejko, Ewa; Machado, Luís; Malinowska, Agnieszka B.; Martins, NatáliaThe paper is devoted to multi-agent systems with memories under denial-of-service (DoS) attacks. The memory is represented by the fractional derivative that appears in the dynamics of the considered systems. The problem that we aim to address is, under which conditions the system continues to be stable or is in consensus mode, despite DoS attacks. Solutions to these problems are proposed in the presented theore...
THE FIRST YEAR OF THE ABDOMINAL AORTIC ANEURYSM MODULE OF THE PORTUGUESE NATION...
Bastos Goncalves, Frederico; Menezes, José Daniel; Mansilha, Armando; Vieira, Mário; Sousa, Joel; Quintas, Anita; Vaz, Carolina; Brandão, DanielIntroduction: Clinical registries are fundamental tools to understand the reality and audit the treatment of abdominal aortic aneurysms (AAA). The Portuguese Society of Angiology and Vascular Surgery, promotor of the National Registry of Vascular Procedures (RNPV), has developed a AAA module that started in December 2019. The objective of this report is to present data of the first year of the AAA module from P...
Periodic Renal Pain: Nutcracker Syndrome Due to Duplication of the Left Renal Vein
Maciel, Catarina; Subtil, Joana; Machado, Luís; Subtil, PauloThe Nutcracker syndrome is a rare condition, resulting from increased pressure in the left renal vein due to different anatomical anomalies. It presents with non-specific symptoms, such as low back pain, hematuria or varicocele, that lead to late diagnosis. We present the case of a 22-year-old patient with multiple episodes of high-intensity and recurrent low back pain, usually preceding the beginning of the ca...
A qualitative analysis of a Mycoplasma genitalium epidemiological model
Almeida, Ricardo; Monteiro, M. Teresa T.; Venturino, Ezio; Machado, LuísThe objective of the article is to present a qualitative analysis of a mathematical model for the spread of a sexually transmitted infection caused by Mycoplasma genitalium. Recent investigations revealed that this pathogen is becoming resistant to the use of macrolides and can turn into a superbug in the next few years. We present an epidemiological model to describe the spread of the disease. The equilibrium ...
A novel multilevel solid-state transformer for hybrid power grids
Monteiro, Vítor Duarte Fernandes; Pedrosa, D.; Coelho, Sérgio; Sousa, Tiago José Cunha; Machado, Luís; Afonso, João L.This paper presents a new proposed topology of a solid-state transformer (SST) for application in hybrid power grids (ac and dc), in which the possibility of operating with various voltage levels (multilevel) in both sides is the main characteristic. At the interface with the power grid (primary side), the proposed SST consists of an ac-dc converter in Y configuration that guarantees operation with five levels ...