Dipòsit Digital de la Universitat de Barcelona

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El Dipòsit Digital de la Universitat de Barcelona és el repositori institucional que conté en format digital els materials derivats de l'activitat docent, investigadora i institucional de la comunitat universitària.

Enviaments recents

Plan de negocio de Sodega Audio Labs, consultora de audio branding para el sector de restauración en Barcelona
(2026) Vivas Bautista, Pavel Andrei; Rof Bertrans, Albert
Este plan de negocio evalúa la viabilidad estratégica y financiera de Sodega Audio Labs, una consultora especializada en audio branding dirigida al sector de la restauración en Barcelona. La propuesta surge en un contexto altamente competitivo, donde muchos establecimientos buscan diferenciarse a través de la experiencia del cliente, pero afrontan dificultades relacionadas con la gestión de la música ambiental, la coordinación del personal y el cumplimiento de normativas municipales y de propiedad intelectual . Como respuesta a estas necesidades, Sodega Audio Labs plantea un modelo de servicio modular que comienza con una auditoría acústica de bajo coste para eliminar la barrera de precio que existe en el sector, y una fase posterior de consultoría especializada, con el objetivo de facilitar el acceso a soluciones de audio branding adaptadas a las características de cada establecimiento El modelo de negocio se apoya en una estructura operativa ligera, gestionada principalmente por los socios fundadores durante las primeras etapas de desarrollo. La inversión inicial prevista asciende a 40,000 euros, financiados mediante aportaciones propias y financiación institucional. Las proyecciones económicas muestran una evolución positiva de la facturación, que pasaría de 54,472.50 euros en el primer año a 107,387.69 euros en el tercero. Asimismo, tras las pérdidas previstas durante la fase de lanzamiento, el negocio alcanzaría una utilidad neta de 27,618.55 euros al cierre del tercer ejercicio. Los indicadores financieros obtenidos sugieren que la propuesta presenta perspectivas favorables de sostenibilidad y creación de valor a medio plazo.
Study of carbon-supported copper catalysts from orange peels − Preparation, characterization, and application in α-pinene oxidation.
(Elsevier B.V., 2025-05-01) Kaminska, Adrianna; Sreńscek-Nazzal, Joanna; Serafin, Jarosław; Kałamagad, Agnieszka; Kiełbasa, Karolina; Wróblewska, Agnieszka
The use of orange peel as a precursor for activated carbon (AC) is a promising way to valorize this waste due to its ease of acquisition and the high elemental carbon content of this raw material. In this study, two different methods for the synthesis of carbon catalysts based on AC from biomass were presented. In these methods, H3PO4 was used as the chemical activator, while Cu (NO3)2 acted as the metal precursor for the active phase of the catalyst. Copper was introduced into the carbon material at different stages of preparation (before and after carbonization). The catalysts were characterized using FTIR, XRD, SEM, EDX and XPS. The textural properties were investigated using N2 sorption at −196 °C. These materials were successfully used in the oxidation of α-pinene and the conversion of this cheap terpene into compounds of great industrial importance (α-pinene oxide, verbenone and verbenol). The results showed that the material prepared by impregnating the already prepared carbon support (AC_5%Cu_impregnation) was more active. For this catalyst, the conversion of α-pinene was 53 mol%, while this value for AC_5%Cu_oven sample was 43 mol%. The selectivity of the α-pinene oxide was 48 mol% for AC_5%Cu_impregnation sample and 39 mol% for AC_5%Cu_oven catalyst. The selectivities of the other products eg. verbenone and verbenol were not significantly different for both catalysts. Considering catalytic activity, it was found that a better method of prepared catalysts for use in the α-pinene oxidation was impregnation of carbonaceous support with a copper salt solution after the carbonization process.
Neurofilament Light Chain Levels in Anti-NMDAR Encephalitis and Primary Psychiatric Psychosis
(Lippincott, Williams & Wilkins. Wolters Kluwer Health, 2022-04-05) Guasp, Mar; Martín Aguilar, Lorena; Sabater Baudet, Lidia; Bioque Alcázar, Miquel; Armangué, Thaís; Martínez Hernández, Eugenia; Landa, Jon; Maudes, Estíbaliz; Borràs, Roger; Muñoz Lopetegi, Amaia; Saiz Hinarejos, Albert; Castro Fornieles, Josefina; Graus Ribas, Francesc; Parellada Rodón, Eduard; Querol, Luis; Dalmau Obrador, Josep
Background and Objectives An important challenge in diagnosing anti–NMDA receptor (NMDAR) encephalitis (NMDARe) is differentiating it from a first episode of psychosis (FEP) caused by a psychiatric disease (pFEP). CSF antibody testing distinguishes these diseases, but spinal taps are difficult to obtain in psychiatric facilities. A separate problem is the lack of biomarkers of NMDARe severity and outcome. Here we assessed the performance of neurofilament light chain (NfL) testing in these settings. Methods In this observational study, NfL levels were determined with single-molecule array in patients with NMDARe, pFEP, herpes simplex encephalitis (HSE), and healthy participants (HC), with the last 2 groups used as controls. Receiver operating characteristic (ROC) analyses were performed to assess the prediction accuracy of serum NfL (sNfL) levels for NMDARe and pFEP and to obtain clinically useful cutoffs. Results One hundred eighteen patients with NMDARe (33 with isolated psychosis at presentation), 45 with pFEP, 36 with HSE, and 36 HC were studied. Patients with NMDARe with seizures/status epilepticus, intensive care unit admission, and CSF pleocytosis (>20 white blood cells/µL) and without early immunotherapy were more likely to have higher NfL (mainly in CSF) than individuals with NMDARe without these features. NfL levels at diagnosis of NMDARe did not correlate with outcome at 1-year follow-up assessed with the modified Rankin Scale. Patients with NMDARe had significantly higher sNfL than individuals with pFEP and HC and lower sNfL than patients with HSE. ROC analysis of sNfL between NMDARe with isolated psychosis and pFEP provided an area under the curve of 0.93 (95% CI 0.87–0.99) and an sNfL cutoff ≥15 pg/mL to distinguish these disorders (sensitivity 85%, specificity 96%, positive likelihood ratio 19.3). Forty-three of 45 (96%) patients with pFEP had sNfL<15 pg/mL, whereas only 5 of 33 (15%) with NMDARe with isolated psychosis were below this cutoff (risk estimation NMDARe vs pFEP: odds ratio 120.4 [95% CI 21.8–664], p < 0.001). None of the patients with HSE and 35 of 36 (97%) HC had sNfL<15 pg/mL. Discussion NfL measured at diagnosis of NMDARe associated with features of disease severity but not with long-term outcome. Young patients with FEP and sNfL ≥15 pg/mL had a 120 times higher chance of having NMDARe than those with pFEP. This cutoff correctly classified 96% of patients with pFEP and 85% of patients with NMDARe with isolated psychosis. Patients with FEP of unclear etiology and sNfL ≥15 pg/mL should undergo CSF NMDAR antibody testing.
Luz del Ahora: mindfulness en adultos mayores en residencias: Intervención basada en presencia, calma y compasión
(2026) Velocce Pertuzé, Nicole; Teruel , Ildefonso
El presente estudio analiza la implementación y los efectos de una intervención basada en mindfulness en el bienestar emocional de personas mayores en contexto residencial. En respuesta a las necesidades asociadas al envejecimiento en contextos residenciales, se desarrolló el programa “Luz del Ahora”, orientado a promover la calma, la atención plena y la compasión mediante prácticas adaptadas. Para ello, se empleó un enfoque metodológico mixto, combinando una evaluación pretest y postest con observación cualitativa en una muestra de nueve personas mayores residentes en un centro en Madrid. Los resultados evidencian una tendencia de mejora en el bienestar emocional, con mayor reconocimiento de estados internos y experiencias de calma, aunque persisten dificultades en su aplicación en la vida cotidiana. Se concluye que las intervenciones basadas en mindfulness constituyen una herramienta viable para el acompañamiento emocional.
Black holes galore in D>4
(Springer Science + Business Media, 2025-04-24) Emparan García de Salazar, Roberto A.
The black hole solutions to Einstein’s vacuum equations in four dimensions contain just one example: the Kerr black hole. Over the past two decades, we have understood that higher-dimensional black holes are far more plentiful. I give a straightforward account of the reasons for this abundance based on three key ideas: (i) Horizons in can be long. (ii) Long horizons are flexible. (iii) Long horizons are unstable. I conclude with some comments and conjectures about the classification problem.