Buscador de Tesis y publicaciones académicas

Quaternionic Mahler measure

Weijia Wang · Hao Zhang

We introduce the quaternionic Mahler measure for non-commutative polynomials, extending the classical complex Mahler measure. We establish the existence of quaternionic Mahler measure for slice regular polynomials in one and two variables. We study the quaternionic Mahler measure for real and slice regular polynomials,...

Unconditionally positivity-preserving explicit order-one strong approximations of financial SDEs with non-Lipschitz coefficients

Xiaojuan Wu · Ruishu Liu · Jiahao Xu

In this paper, we are interested in positivity-preserving approximations of stochastic differential equations (SDEs) with non-Lipschitz coefficients, arising from computational finance and possessing positive solutions. By leveraging a Lamperti transformation, we develop a novel, explicit, and unconditionally positivit...

Molecular detection of Paenibacillus larvae, Melissococcus plutonius and Vairimorpha spp., in historical honey samples from South Brazil

Matheus Iuri, Frühauf · Aroni, Sattler · Lariane, da Silva Barcelos · Nadálin Yandra, Botton · y 6 más

Honey bee colonies are threatened by several pathogens, including Paenibacillus larvae, Melissococcus plutonius, Vairimorpha apis, and Vairimorpha ceranae. Those infections affect bee health, survival, and productivity. The social behavior of the bees facilitates the spread of these pathogens, making disease management...

Evidence of a low-energy cutoff in the injected spectrum of a pulsar wind nebula

Zhihong Shi · C.-Y. Ng · Niccolò Bucciantini · B.M. Gaensler · y 4 más

Bow-shock pulsar wind nebulae (PWNe) are synchrotron sources formed when the outflow of supersonic pulsars is confined by the surrounding interstellar medium. These sources are dominated by freshly injected particles, thus providing a unique laboratory for studying particle acceleration in relativistic outflows. The Mo...

CO2 capture and cleaning of HTL gas stream using the HTL solid fraction as adsorbents

Pinzolas-Rubio, Alejandro · Águeda Maté, Vicente Ismael · Delgado Dobladez, José Antonio · Oliveira, Adriana S. · y 1 más

A decision-support framework for asbestos hazard assessment and management in cultural heritage assets

Petriglieri, Jasmine R. · Capella, Silvana · Siviero, Fabrizio · Belluso, Elena

Asbestos is extensively regulated in many countries around the world, both in industrial and construction contexts, due to its well-established health risks. However, its occurrence within cultural heritage remains poorly addressed by existing regulatory and management frameworks. Many artefacts, monuments, and histori...

Development of an analytical procedure for the characterization of the particulate matter emitted by the braking system

Aleandro Diana · Riccardo Cecire · Matteo Marafante · Paolo Inaudi · y 4 más

Brake wear particulate matter (PM) is a relevant source of non-exhaust emissions, but its inorganic characterization remains analytically challenging because of the heterogeneous composition of friction materials and the low concentrations of several target analytes. In this work, a multitechnique analytical workflow w...

Spectral extremal results for triangle-free graphs with chromatic number at least four

Zhu, Yinfen · Lin, Huiqiu

A graph is called $F$-free if it does not contain a copy of $F$. Let $G(r,s)$ denote a $K_{r+1}$-free graph of order $n$ with chromatic number at least $s$ that maximizes the spectral radius. Nikiforov [Linear Algebra Appl., 2007] proved the spectral Turán theorem, which implies that $G(r,s)$ is the $r$-partite Turán g...

Perfect powers in sequences of polygonal numbers

Andrzej Dąbrowski · Salah Eddine Rihane · Gökhan Soydan · Paul M. Voutier

Let $P_s(n)$ denote the $n$-th $s$-gonal number. Consider the Diophantine equation $P_{s}(n) = t^{m}$ for integers $n, s, t$ and $m > 2$. All solutions to this equation are known for $m>2$ and $s\in\{3,5,6,8,10,20\}$. Here we extend these results to the cases $s = 2k+4$ (where $k = 4,6$ or $5 \leq k \leq 97$ is a prime...

Recurrent deep vein thrombosis in an adolescent

Ayelén, Samarro · María A, Segura · Cecilia, Robledo

Deep vein thrombosis (DVT) in children, although rare, has shown an increase in incidence associated with a rise in risk factors. We report the case of a 17-year-old female patient with recurrent thrombosis complicated by pulmonary thromboembolism and post-thrombotic syndrome. Several risk factors were identified, incl...