Repositório Institucional da Universidade Estadual da Paraíba
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LoRa Power Model for Energy Optimization in IoT Applications
No full textEnergy efficiency is a key requirement for Internet of Things (IoT) nodes, particularly in applications powered by energy harvesting that operate without batteries. In this work, we present a parametric power model of a LoRa transceiver (Semtech SX1276) aimed at ultra-low power remote sensing scenarios. The transceiver was characterized in all relevant states (startup, transmission, reception, and sleep), and the results were used to build a state-based model that predicts average power consumption as a function of transmission power, sleep strategy, packetization, and input data rate. Experimental validation confirmed that the cubic fit for transmission peaks achieves a determination coefficient of 0.99, while reception is added as a constant consumption. The model was implemented in a Python simulator that provides mean, best-case, and worst-case estimates of system power consumption, and it was validated in an ASIC-based sensor node demonstration, with predictions within 10% of measured values. The framework highlights the trade-offs between energy efficiency and robustness (e.g., minimal SF and no CRC vs. higher spreading factors and error-control) and supports the design of custom controllers for ultra-low power IoT nodes as well as more energy-permissive applications
Thermal Models for Hadron Production in Relativistic Heavy-Ion Collisions
No full textTreballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2026, Tutor: Juan M. Torres RincónIn this work, we investigate hadron production in relativistic proton–lead and protonproton collisions using phenomenological thermal-statistical models. The transverse momentum spectra (pT ) of identified pions, kaons and protons are analyzed with the Blast-Wave Model framework.
The theoretical results show good agreement with experimental measurements from the ALICE Collaboration at CERN, successfully reproducing the spectra of different particle species and collision centralities. In addition, an improved Blast-Wave model is implemented in Monte Carlo simulations, which allows for hadron 3-momenta generation within the experimental acceptance, for its use in phenomenological applications. After validation, we finally apply the Monte Carlo code to generate pair distribution of hadrons as a function of their relative momentu
Characterization of two membrane-associated β-glucosidases from maize coleoptiles
No full textWe isolated membrane vesicles from maize (Zea mays L.) coleoptiles and identified in these vesicles a 58 kDa (pm58) and a 60 kDa (pm60) protein by photoaffinity labelling with 5-azido-[7-3H]indole-3-acetic acid ([3H]N3IAA). Photoaffinity labelling was effectively competed for by auxins as well as by flavonoids. The labelled proteins were solubilized by Triton X-114 from the vesicles and partially purified. Microsequence analysis revealed that pm60 is a beta-glucosidase. This was confirmed by biochemical and immunological analysis. We show that pm60 has a beta-D-glucoside glucohydrolase (EC 3.2.1.21) activity. It uses p-nitro-phenyl beta-D-glucopyranoside (PNPG) as a substrate, with a pH optimum of 5.0. The Km for PNPG is 0.652 mM and the Vmax. 6.24 mumol.min-1.mg-1. The beta-glucosidase activity of pm60 was competitively inhibited by IAA and 1-naphthylacetic acid as well as by gluconolactam and glucose. N-terminal amino-acid-sequence analysis of pm58 revealed similarity to pm60, suggesting that both proteins are encoded by different members of a gene family
Voices heard and unheard: Analizing legislative amendment proposals on underprivileged groups in Spain
No full textThis paper explores the circumstances under which parliamentary groups reference underprivileged groups—specifically, women, immigrants and people with disabilities –in their legislative amendment proposals. Drawing on a comprehensive dataset covering all executive bills passed in Spain between 1996 and 2023, we find that the presence of interest groups in parliamentary hearings significantly increases the visibility of the underprivileged in the amending activity of political parties, thereby enhancing their representation. Similarly, a higher proportion of women Members of Parliament (MPs) in a parliamentary group is associated with more frequent amendments referencing women and people with disabilities, while there is some evidence, albeit less conclusive, of a similar effect for immigrants. Media coverage boosts attention to women and people with disabilities, but has no significant impact on references to immigrants. Surprisingly, partisan preferences have no influence on references to women and immigrants in amendment proposals; however, right-wing parties are more likely to reference people with disabilities. These findings contribute fresh insights into the dynamics of legislative behavior, representation, and the presence of interest groups in parliamentary processes
A new estimate of Ecuador's GDP, 1900-50
No full textOfficial Ecuadorian GDP data begins in 1950. Prior, only preliminary estimates were available, based on very scattered evidence and broad assumptions. In this paper, we estimate new GDP figures for Ecuador for 1900-1950. These are based on the quantitative and qualitative information available for the period, using extensive primary and secondary sources. The new data series allows analysing Ecuador's economic growth and structural change and comparing them to industrialized core countries and other countries in the region. Unlike previous estimates, our series shows a sustained divergence of Ecuador from the core countries during the first half of the 20th century
Analogies and singularities of the tutorial function in face-to-face and online contexts in the Master's Degree in Teacher Training for Compulsory Secondary Education and Baccalaureate, Vocational Training and Language Teaching
No full textEl presente artículo reflexiona sobre la función tutorial del docente en relación con el Trabajo de Final de Titulación en el contexto del Máster en Profesorado de Enseñanza Secundaria Obligatoria y Bachillerato, Formación Profesional y Enseñanza de Idiomas y el impacto de su futura práctica en el discente. La revisión de la literatura científica alertó de cierta ausencia de bibliografía relacionada con el Trabajo Final de Máster, adquiriendo mayor relevancia en las investigaciones los contenidos propios sobre las materias de estudio. Se realizó un focus group virtual con 12 participantes de 3 universidades españolas, una presencial y dos online. Se recogieron sus experiencias en el ejercicio docente, atendiendo a la identidad profesional del tutor/a, aspectos funcionales externos a la tutorización y el desarrollo de esta; así como los retos e inquietudes que emergen en la tarea profesional, desde una prospectiva de mejora de la práctica educativa. Como resultados y en concordancia con la bibliografía, los docentes señalan la orientación como la función principal del proceso tutorial y describen una serie competencias curriculares y emocionales intrínsecas, a la vez que demandan formación de mejora voluntaria para el docente
Full 5D characterisation of the Sagittarius stream with Gaia DR2 RR Lyrae
No full textContext. The Sagittarius (Sgr) stream is one of the best tools that we currently have to estimate the mass and shape of our Galaxy.
However, assigning membership and obtaining the phase-space distribution of the stars that form the tails of the stream is quite challenging.
Aims. Our goal is to produce a catalogue of the RR Lyrae stars of Sgr and obtain an empiric measurement of the trends along the stream in sky position, distance, and tangential velocity.
Methods. We generated two initial samples from the Gaia DR2 RR Lyrae catalogue: one selecting only the stars within ±20◦ of the orbital plane of Sagittarius (Strip), and the other resulting from application of the Pole Count Map (nGC3) algorithm. We then used
the model-independent, deterministic method developed in this work to remove most of the contamination by detecting and isolating the stream in distance and proper motions.
Results. The output is two empiric catalogues: the Strip sample (higher-completeness, lower-purity) which contains 11 677 stars,and the nGC3 sample (higher-purity, lower-completeness) with 6608 stars. We characterise the changes along the stream in all the available dimensions, namely the five astrometric dimensions plus the metallicity, covering more than 2π rad in the sky, and obtain new estimates for the apocentres and the mean [Fe/H] of the RR Lyrae population. Also, we show the first map of the two components of the tangential velocity thanks to the combination of distances and proper motions. Finally, we detect the bifurcation in the leading arm and report no significant difference between the two branches in terms of metallicity, kinematics, or distance.
Conclusions. We provide the largest sample of RR Lyrae candidates of Sgr, which can be used as input for a spectroscopic follow-up or as a reference for the new generation of models of the stream through the interpolators in distance and velocity that we constructed
Orientació educativa. Bases conceptuals
No full textAquest document presenta una aproximació conceptual a l’orientació educativa. S’estructura en quatre grans apartats amb la finalitat d’oferir una visió sistemàtica i organitzada d’aquest àmbit. S’inicia amb una conceptualització que estableix el marc teòric i delimita els principals conceptes que la defineixen. A continuació, es desenvolupa el marc general de l’orientació educativa, en el qual s’analitzen els models d’intervenció, les àrees d’actuació i els agents i nivells implicats. Seguidament, s’exposen els principis que regeixen l’orientació educativa i que vertebren els continguts de la pràctica professional. Finalment, el document aborda les funcions de l’orientació, tot destacant el seu paper en el suport als processos educatius i en el desenvolupament integral de les persones.Aquest document presenta una aproximació conceptual a l’orientació educativa. S’estructura en quatre grans apartats amb la finalitat d’oferir una visió sistemàtica i organitzada d’aquest àmbit. S’inicia amb una conceptualització que estableix el marc teòric i delimita els principals conceptes que la defineixen. A continuació, es desenvolupa el marc general de l’orientació educativa, en el qual s’analitzen els models d’intervenció, les àrees d’actuació i els agents i nivells implicats. Seguidament, s’exposen els principis que regeixen l’orientació educativa i que vertebren els continguts de la pràctica professional. Finalment, el document aborda les funcions de l’orientació, tot destacant el seu paper en el suport als processos educatius i en el desenvolupament integral de les persones
Good practices for humanization in pediatric intensive care units: a national Delphi consensus study
No full textObjectives: To adapt and validate a good practice manual on humanisation, originally designed for adult critical care patients, to the paediatric intensive care unit (PICU) context. Methods: A methodological study to adapt and validate a clinical practice manual was conducted using a threeround Delphi consensus technique between February and October 2023 with 53 experts (56.6 % nurses, 28.3 % physicians, 15.1 % other professionals) from 15 Spanish hospitals. In the first round, participants evaluated 160 practices from the Manual of Good Practices in Humanization for Adult Intensive Care Units (HU-CI Project) and adapted them to the paediatric context. In the second round, they validated these modifications and 30 additional proposals. In the third round, the consensus practices were classified into three levels. Consensus was defined as ≥75 % agreement. Results: Of 57 initial participants, 53 completed the three Delphi rounds, resulting in a 93 % retention rate. Among participants, 79.2 % were women, 56.6 % were nurses, and 94.4 % had experience in PICUs. From the original 160 initial practices, 47.4% (n = 76) reached consensus without modification, 16.9 % (n = 27) were modified, and 35.6 % (n = 57) were discarded. Additionally, 30 new practices were proposed and accepted, resulting in 132 final practices. These were categorised as basic (65 %, n = 86), advanced (22 %, n = 29), and excellent (13 %, n = 17). Conclusions: This study adapted and validated the first humanisation manual specifically for PICUs, providing a structured, measurable framework that may promote child- and family-centred care and support continuous quality improvement. Implications for clinical practice: The consensus-validated practices provide PICU teams with a structured, measurable framework that may help promote child- and family-centred care. Nursing staff play a key role in daily implementation of family involvement, communication, and comfort measures, whilst the three-level classification allows progressive evaluation of PICU humanisation according to unit resources
Characterisation of the gut-lung axis microbiome in clinically stable patients with chronic obstructive pulmonary disease.
No full textBackground
Airway and gut dysbiosis have been reported in Chronic Obstructive Pulmonary Disease (COPD); however, their relationship and association with clinical features remain poorly understood. We aimed to characterise the lung and gut microbiome in patients with stable COPD and controls.
Methods
Prospective, multicentre, longitudinal and controlled study of n = 60 stable patients with COPD and n = 30 controls. In them, we analysed 16S rRNA-seq in oropharyngeal (OP) swabs, sputum, bronchoalveolar lavage fluid (BALF) and stool. Weighted gene co-expression network analysis (WGCNA) was employed in each sample type to identify modules of co-abundant bacteria associated with clinical traits.
Findings
We found that the microbiome in airway and stool samples was highly dissimilar both in patients and controls, with 0.37% of this diversity associated to COPD. The microbiome taxa associated with COPD in OP swabs and sputum were highly similar, but different from BALF, suggesting that OP swabs can be a surrogate sample of sputum. Finally, using WGCNA, we identified: (a) 5 modules in OP swabs and 3 in sputum associated with FEV1, but some of them were also associated with exacerbations, dyspnoea and inhaled steroid (ICS) use; (b) In BALF 4 modules associated with FEV1 and dyspnoea, and 2 modules with ICS; and, finally, (c) in stool, 1 module related to FEV1, 1 to exacerbations and 3 with ICS.
Interpretation
The gut and lung microbiomes in patients with COPD are distinct, but both clinically relevant as both present bacterial associations with airflow limitation, exacerbation history, and ICS use