12096 research outputs found
Sort by
High-temperature superspin glass and low-temperature glassy exchange bias in passivated FeCo nanoparticles
No full textConventional powders, dense systems of magnetic nanoparticles, often combine intra- and inter-particle magnetically glassy properties, which may complicate their interpretation. To shed light on this matter, we have studied 9 nm FeCo particles synthesized by thermal co-decomposition of metal amides after a passivation layer around 2 nm thick has formed in ambient conditions. The saturation magnetization, 117 emu/g, is consistent with the above metallic core/ferrite shell picture. The high magnetic moment and concentration of the particles yield, via strong interparticle interactions, a remarkable room temperature superspin glass-like phase (with freezing temperature above 350 K) for such small particles, as confirmed by the de Almeida-Thouless analysis. Additionally, we detect a spin glass-like freezing at the atomic scale (within the particles). Its corresponding feature, a small hump under small fields in the temperature dependence of the magnetization, closely agrees with the onset of the exchange bias effect (∼ 60 K) measured, unlike it is customary, with repeated field-coolings. The spin-disordered nature of the core/shell interface is further proved by a strong training effect of the exchange bias field, among others. This magnetic behavior offers an indirect proof of structural interface disorder even in fully passivated metallic particles.The authors acknowledge financial support from the grants PID2021-122613OB-I00 funded by MCIN/AEI/10.13039/501100011033 and CNS2022-135787 funded by MCIN/AEI/10.13039/501100011033 and European Union NextGenerationEU/PRTR). J.A.D.T. and R. L-M acknowledge the financial support from Ministerio de Ciencia, Innovación y Universidades [grant: PID2022-142267NB-I00]. This work was supported in part by the EUR grant NanoX nº ANR-17-EURE-0009 and by the TOURS 2015 project in the framework of the Programme des Investissements d'Avenir. R. L-M. acknowledges his contract to the 'Plan Propio I + D + I' from the UCLM, co-funded by the European Social Fund (2020-PREDUCLM-16730).
Open access funding provided by Universidad Pública de Navarra
Sistema de planos acotados: trazados técnicos fundamentales sobre superficies topográficas
No full textApuntes de la asignatura Expresión Gráfica de 1er curso en los Grados de la rama industrial de la ETSIIIT.Este documento desarrolla los fundamentos del Sistema de Planos Acotados aplicados al análisis y representación técnica de superficies topográficas. Se abordan las herramientas gráficas necesarias para comprender y resolver problemas geométricos relacionados con el terreno.
En primer lugar, se expone la representación gráfica del terreno mediante curvas de nivel, identificando accidentes geográficos. Posteriormente, se estudian los trazados en planta y su aplicación en operaciones de inserción y enlace de líneas con pendiente definida, esenciales para representar recorridos o infraestructuras.
A continuación, se analizan los perfiles del terreno, tanto longitudinales como transversales, explicando su finalidad, estructura y los datos que se asocian a cada tipo. Estos perfiles permiten visualizar la variación del terreno en secciones concretas, facilitando el diseño de obras civiles.
El documento también aborda el proceso de explanación del terreno, diferenciando entre alineaciones rectas y curvas, tanto horizontales como en pendiente. Se explican los métodos de los conos de talud y de perfiles, con sus ventajas y limitaciones.
Finalmente, se introduce la cubicación del terreno, es decir, el cálculo de volúmenes de tierra a mover, y el trazado de caminos rurales, desde la fase inicial del proyecto hasta su desarrollo completo.
Este compendio busca proporcionar una base sólida para el análisis geométrico y técnico del terreno en contextos de ingeniería, arquitectura y planificación territorial
Nanoscale engineering of cobalt-gallium co-doped ferrites: a strategy to enhance high-frequency theranostic magnetic materials
No full textThe nanoscale engineering of doped iron oxide magnetic nanoparticles has attracted significant interest in recent years for high-frequency theragnostic applications, where simultaneous diagnosis and therapy are required. In particular, their ability to generate localized heating under alternating magnetic fields makes them ideal candidates for magnetic hyperthermia, a noninvasive cancer treatment technique. However, understanding the complex interplay between multiple dopant cations and their impact on dynamic magnetic behavior remains a significant challenge. In this work, we present a comprehensive study on how two differently marked cations (Co2+ and Ga3+) can modify both the magnetic properties of these nanoparticles and their efficiency in heat generation under alternating magnetic fields. To this end, a series of nanoparticles with the formula CoxGa0.15Fe2.85-xO4 (0 < x < 0.3) was prepared via thermal decomposition, enabling the production of monodisperse nanocrystals with high crystallinity and precise stoichiometric control. Their exhaustive structural and magnetic characterization confirmed site-selective incorporation of Ga3+ into tetrahedral sites and Co2+ into octahedral sites. Increasing the cobalt content within the gallium-doped framework leads to enhanced magnetocrystalline anisotropy and higher saturation magnetization, both crucial parameters for efficient heat dissipation in magnetic hyperthermia. The study further demonstrates that the dynamic magnetic response of these nanostructures is strongly influenced by the interplay between doping composition, anisotropy, and the amplitude of the applied magnetic field. These findings highlight the effectiveness of nanoscale codoping strategies in fine-tuning magnetic behavior and optimizing the performance of spinel ferrite nanoparticles for advanced biomedical and technological applications, particularly high-frequency magnetic hyperthermia.I.G.R acknowledges the Gipuzkoa Foru Aldundia for its financial support through the Gipuzkoa Fellowship Program. D.L. acknowledge the EU's Horizon 2020 - Marie-Sklodowska Curie action (grant agreement No 101034285). J.R.Z., I.G.R and L.C.G acknowledges the Spanish Ministerio de Ciencia, Innovación y Universidades and Consejo Superior de Investigaciones Científicas for financial support and for provision of synchrotron radiation facilities at BM25-SpLine (PIE 2010 6 0E 013 and PIE 2021 60 E 030). J.D. and G.G. acknowledge the support of Fundação de Apoio a Pesquisa do Distrito Federal (Grant 00193.00002036/2023-76). A.L.O. acknowledges financial support from the grant CNS2022-135787 funded by MCIN/AEI/10.13039/501100011033 and European Union NextGenerationEU/PRTR. J. D, G. G and A. L.O gratefully acknowledge the financial support of the Brazilian National Council for Scientific and Technological Development (CNPq) through the project of International collaboration number 443902/2023-2.
Open access funding provided by Universidad Publica de Navarra
Designing novel interspecific baculovirus combinations for effective control of the soybean lepidopteran pest complex
No full textLa producción de soja se ve afectada significativamente por múltiples lepidópteros plaga que desarrollan rápidamente resistencia a productos químicos sintéticos, pesticidas bioracionales y cultivos transgénicos Bt. En este contexto, los baculovirus, particularmente los nucleopoliedrovirus (NPVs), ofrecen una alternativa efectiva, segura y sostenible para el control de plagas, algunas de las cuales se han utilizado con éxito como agentes de control biológico en la agricultura durante décadas. Sin embargo, su estrecho espectro de huéspedes limita su eficacia contra complejos de plagas en agroecosistemas como los cultivos de soja, donde los productores necesitan múltiples formulaciones basadas en baculovirus.
La gran diversidad genética existente entre y dentro de los baculovirus ofrece una oportunidad para identificar variantes genotípicas de alto rendimiento. Esta tesis postuló que, al mezclar estratégicamente estos genotipos, se podrían controlar simultáneamente una amplia variedad de plagas de lepidópteros en la soja. La combinación de genotipos con fuertes propiedades insecticidas y diferentes especificidades de huéspedes podría simplificar la gestión de plagas, permitiendo a los agricultores controlar múltiples plagas con un solo producto y reduciendo la complejidad de las estrategias de gestión de plagas.
Esta investigación comenzó con una revisión exhaustiva de las especies de lepidópteros plaga que causan pérdidas económicas en la soja, junto con los métodos de control actualmente utilizados contra ellas (Capítulo I). Se identificaron dos especies dentro de la familia Noctuidae como plagas clave en los cultivos de soja americanos: Anticarsia gemmatalis Hübner y Chrysodeixis includens Walker. Además, se consideraron varias otras noctuidas (específicamente, Rachiplusia nu Guenée, Helicoverpa armigera Hübner, Helicoverpa zea Boddie, Heliothis virescens Fabricius y varias especies dentro del género Spodoptera) como plagas secundarias.
El trabajo experimental se inició con el análisis de las características insecticidas de cinco NPVs con amplio espectro de huéspedes (Capítulo II). Se seleccionó el aislado más patogénico, la cepa Anfa-C5B3 del NPV múltiple de Anagrapha falcifera (AnfaMNPV; Alphabaculovirus aucalifornicae), para una caracterización genotípica adicional. Se purificaron 30 genotipos mediante ensayo de placa y uno de ellos, Anfa-C, reveló propiedades insecticidas muy efectivas (en términos de patogenicidad, virulencia y producción de cuerpos de oclusión (OB)) contra una de las principales especies de lepidópteros plaga de la soja en América, C. includens, así como contra H. armigera, H. zea, S. exigua y T. ni. Estos hallazgos establecieron a Anfa-C como el primer candidato para una formulación compuesta basada en baculovirus.
El siguiente análisis de cribado se centró en seleccionar un genotipo contra A. gemmatalis, una de las plagas clave en los cultivos de soja en América, que no era permisiva para Anfa-C (Capítulo III). Se caracterizaron tres aislados del NPV múltiple de Anticarsia gemmatalis (AgMNPV, Alphabaculovirus angemmatalis). AgABB51, el aislado más patogénico y diverso genotípicamente, contenía 18 variantes genotípicas distintas, una de las cuales, Ag-M, mostró una alta actividad insecticida contra A. gemmatalis. Ag-M se convirtió así en el segundo candidato viral para formulaciones de virus mixtos.
Para abordar las plagas de Spodoptera en los cultivos de soja, se llevó a cabo un análisis de cribado de NPVs específicos de Spodoptera (Capítulo IV).
Una variante purificada por placa, Sf-GA, derivada del aislado Sf-G1 del NPV múltiple de Spodoptera frugiperda (SfMNPV, Alphabaculovirus spofrugiperdae), mostró la mayor eficacia en el control de las tres especies de Spodoptera. Así, Sf-GA fue identificado como otro candidato para el desarrollo de formulaciones de virus mixtos con un amplio espectro de huéspedes.
Con los tres virus candidatos, se evaluaron dos mezclas equimolares interespecíficas de OBs, Anfa-C:Ag-M y Anfa-C:Sf-GA, contra seis especies de de lepidópteros plaga de la soja (Capítulo V). La mezcla Anfa-C:Ag-M amplió eficazmente el espectro de huéspedes de los genotipos individuales a cinco plagas, incluyendo A. gemmatalis, lo que la convierte en un candidato adecuado para los cultivos de soja americanos. La mezcla Anfa-C:Sf-GA proporcionó un control efectivo de las especies de Spodoptera, ofreciendo al mismo tiempo un espectro más amplio de huéspedes para gestionar varias plagas en los cultivos de soja fuera del continente americano.Soybean production is significantly impacted by multiple lepidopteran pests rapidly evolving resistance to synthetic chemicals, biorational pesticides, and transgenic Bt cultivars. In this context, baculoviruses, particularly nucleopolyhedroviruses (NPVs) offer an effective, safe and sustainable alternative for pest control, some of which have successfully been employed as biocontrol agents in agriculture for decades.
However, their narrow host range limits their efficacy against pest complexes in agoecosystems like soybean crops, where growers need multiple baculovirus-based formulations.
The great genetic diversity existing within and between baculoviruses offers an opportunity to identify high-performing genotypic variants. This thesis hypothesized that by strategically mixing these genotypes, a broad array of lepidopteran soybean pests could be targeted simultaneously. Combining genotypes with strong insecticidal properties and different host specificities, could simplify pest management, allowing farmers to control multiple pests with a single product and reducing the complexity of pest management strategies.
This study began with a comprehensive review of the lepidopteran pest species that cause economic losses on soybean along with the control methods currently used against them (Chapter I). Two species within the Noctuidae family were identified as key pests in American soybean crops:
Anticarsia gemmatalis Hübner and Chrysodeixis includens Walker. Additionally, several other noctuids (namely, Rachiplusia nu Guenée, Helicoverpa armígera Hübner, Helicoverpa zea Boddie, Heliothis virescens Fabricius, and several specieswithin the genus Spodoptera) were considered as secondary pests.
The experimental work was initiated with the analysis of the insecticidal characteristics of five broad host range NPVs (Chapter II). The most pathogenic isolate, Anagrapha falcifera multiple NPV (AnfaMNPV; Alphabaculovirus aucalifornicae) strain Anfa-C5B3, was selected for further genotypic characterization. Thirty genotypes were plaque-purified and one of them, Anfa-C revealed highly insecticidal properties (in terms of pathogenicity, virulence and OB production) against one of the key lepidopteran soybean pests in the Americas, C. includens, as well as against H. armigera, H. zea, S. exigua, and T. ni. These findings established Anfa-C as a first candidate for a composite baculovirus-based formulation.
The next screening analysis focused on selecting a genotype against A. gemmatalis, one of the key pests in soybean crops in America, which was nonpermisive to Anfa-C (Chapter III). Three Anticarsia gemmatalis multiple NPV (AgMNPV, Alphabaculovirus angemmatalis) isolates were characterized.
AgABB51, the most pathogenic and genotypically diverse isolate, contained 18 different genotypic variants, one of which, Ag-M, demonstrated high insecticidal activity against A. gemmatalis. Ag-M thus became the second virus candidate for mixed virus formulations.
To address Spodoptera pests in soybean crops, a screening of specific Spodoptera NPVs was conducted (Chapter IV). A plaque-purified variant, Sf-GA, derived from the Spodoptera frugiperda multiple NPV (SfMNPV, Alphabaculovirus spofrugiperdae) isolate, Sf-G1, demonstrated the highest efficiency in controlling the three Spodoptera species. Sf-GA was thus identified as another candidate for developing broad-spectrum mixed virus formulations.
With the three virus candidates, two interspecific equimolar OB mixtures, Anfa-C:Ag-M and Anfa-C:Sf-GA, were evaluated against six soybean lepidopteran pest species (Chapter V). The Anfa-C:Ag-M mix effectively expanded the host range of the individual genotypes to five pests, including A. gemmatalis, making it a suitable candidate for American soybean crops. The Anfa-C:Sf-GA mixture provided effective control of Spodoptera species while offering a broader host range for managing multiple pests in soybean crops outside the American continent.
In conclusion, this thesis demonstrates that combining baculovirus genotypic variants with different host specificities can enhance pest control efficacy, offering a promising solution for managing complex pest scenarios.
Additionally, the study highlights several important considerations, including the potential of baculoviruses as versatile biocontrol agents, the importance of exploring their application in broader agricultural contexts or the potential of early application and synergistic agents in overcoming the slow-killing nature of these viruses. The findings of this thesis contribute to the ongoing efforts in developing more effective and sustainable pest management strategies.Para la realización de esta tesis se obtuvo un contrato predoctoral FPI del Ministerio de Ciencia e Innovación (PRE2018-086829).Programa de Doctorado en Biotecnología (RD 99/2011)Bioteknologiako Doktoretza Programa (ED 99/2011
Appropriate harvest maturity for exploitation of wild black raspberry (Rubus sp.) fruits during shelf life period from Rawalakot, Azad Jammu and Kashmir
No full textBlack raspberries (Rubus sp.) are abundantly grown and distributed widely in temperate regions of Pakistan which shows rich plant diversity of fruit species. In this study wildly grown black raspberry fruits were harvested from Rawalakot at three different maturity stages and investigated for physical, biochemical and antioxidant properties. Random samples of wild black raspberry fruits from each maturity stage [turning (75% red, 25% green), full red (100% red), black (100% black)] were stored at room temperature (22 ± 2 °C, 46% RH) for maximum 7 days and analysed on alternate days. Results showed that fruit weight, total soluble solids, pH, vitamin C, total flavonoids, total phenols, total antioxidants and total anthocyanins increased whereas fruit firmness and titratable acidity levels decreased as maturity progressed from turning to black stage. During shelf life period, total soluble solids and pH increased, while fruit weight, firmness, total anthocyanins, total flavonoids and total phenols significantly decreased with shelf life period. Moreover, titratable acidity and vitamin C decreased by advancement in shelf life period. It is advisable that wild black raspberry fruits should be harvested at black stage if used for immediate consumption. However, raspberries can be harvested at full red stage to extend storage period without compromising on fruit quality.Authors would like to thank the USDA-Endowment Fund Secretariat (EFS), University of Agriculture, Faisalabad, Pakistan for providing financial assistance under R&D Project # RD041/21
Loneliness and social isolation as risk factors for type 2 diabetes onset: a systematic review and meta-analysis
No full textAims: This study sought to analyze the association of social isolation and loneliness with the risk of type 2 diabetes onset.
Methods: Two authors systematically searched PubMed, EMBASE, and Web of Science databases for studies published until February 2025, assessing the risk of incidence of type 2 diabetes in individuals who are socially isolated or lonely. To quantify the risk of incident diabetes, hazard ratios (HR) for loneliness and social isolation were pooled using a random-effects inverse-variance model with empirical Bayes estimation.
Results: Nine prospective cohort studies were included, comprising 1,112,887 individuals (60.5 % female, mean age = 57.1 years), with 50,961 new cases of type 2 diabetes over a mean follow-up of 10.7 years. Loneliness was associated with a 32% increased risk of type 2 diabetes (HR = 1.32 [95 % confidence interval [CI]:1.11–1.57]). Social isolation was linked to a 20% higher risk (HR = 1.20 [95 %CI:1.01–1.43]). The included studies showed fair-to-good methodological quality (mean score: 10.11/14) based on the Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies.
Conclusions: Social isolation and loneliness are significant risk factors for type 2 diabetes. Addressing social connectedness could be a valuable strategy for diabetes prevention, emphasizing the need to incorporate psychosocial factors into public health initiatives
Drought limits tree growth more than greenness and reproduction: insights from five case studies in Spain
No full textDroughts impact forests by influencing various processes such as canopy greenness, tree growth, and reproduction, but most studies have only examined a few of these processes. More comprehensive assessments of forest responses to climate variability and water shortages are needed to improve forecasts of post-drought dynamics. Iberian forests are well-suited for evaluating these effects because they experience diverse climatic conditions and are dominated by various conifer and broadleaf species, many of which exhibit masting. We assessed how greenness, evaluated using the normalized difference vegetation index (NDVI), tree radial growth, and seed or cone production responded to drought in five tree species (three conifers: silver fir (Abies alba), Scots pine (Pinus sylvestris), and stone pine (Pinus pinea); two broadleaves: European beech (Fagus sylvatica) and holm oak (Quercus ilex) inhabiting sites with different aridity. We correlated these data with the standardized precipitation evapotranspiration index (SPEI) using the climate window analysis (climwin) package, which identifies the most relevant climate window. Drought constrained growth more than greenness and seed or cone production. Dry conditions led to high seed or cone production in species found in cool, moist sites (silver fir, beech, and Scots pine). We also found negative associations of cone production with summer SPEI in the drought-tolerant stone pine, which showed lagged growth−cone negative correlations. However, in the seasonally dry holm oak forests, severe droughts constrained both growth and acorn production, leading to a positive correlation between these variables. Drought impacts on greenness, growth, seed, and cone production depended on species phenology and site aridity. A negative correlation between growth and reproduction does not necessarily indicate trade-offs, as both may be influenced by similar climatic factors.This research was funded by the Science and Innovation Ministry of Spain (projects AGL2012-33465, AGL2016-76463-P, PID2021-123675OB-C43, and TED2021-129770B-C21). ARC acknowledges support by Margarita Salas postdoctoral fellowship (reference RCMS-22-G1T6IW-17-NLHJ80) of the Universidad Politécnica de Madrid
Market analysis of the solar panel recycling industry: a case study of renercycle
No full textLa creciente expansión de los sistemas fotovoltaicos presenta un doble reto: una oportunidad medioambiental y la necesidad de gestionar los residuos de panel solar al final de su vida útil. Esta tesis explora cómo RenerCycle, empresa española especializada en el reciclaje de aerogeneradores, puede introducirse estratégicamente en la emergente industria del reciclaje fotovoltaico en España. Se aplicó una metodología de cuatro fases, que incluía el análisis del entorno macroeconómico, la investigación de mercado, el análisis DAFO y el diseño estratégico. El estudio examinó las tendencias regulatorias globales y europeas, así como las políticas de economía circular, evaluó el potencial del mercado español y analizó las oportunidades de posicionamiento estratégico de RenerCycle. Los resultados destacan una creciente demanda de servicios de reciclaje influenciada por la regulación actual y un importante volumen de residuos fotovoltaicos previsto. Aunque la empresa se enfrenta a limitaciones internas -como una experiencia limitada en el tratamiento de paneles solares y una estructura operativa pequeña-, sus puntos fuertes en sostenibilidad, certificaciones y ubicación estratégica ofrecen ventajas competitivas. La estrategia propuesta se basa en cinco pilares: eficiencia operativa, cumplimiento de la normativa, posicionamiento geoestratégico, sostenibilidad e innovación tecnológica. Se sugieren asociaciones con empresas de logística y tecnología para desarrollar una infraestructura descentralizada y escalable. En conclusión, el estudio concluye que RenerCycle está bien posicionada para convertirse en un actor relevante en el reciclaje fotovoltaico, contribuyendo a los objetivos climáticos de la UE y creando valor a través de los principios de la economía circular.The increasing expansion of photovoltaic systems presents a dual challenge: an
environmental opportunity and the need to manage solar panel waste at the end of their lifespan. This thesis explores how RenerCycle, a Spanish company specializing in wind turbine recycling, can strategically enter the emerging photovoltaic recycling industry in Spain. A four-phase methodology was applied, including analysis of the macroeconomic environment, market research, SWOT analysis, and strategic design. The study examined global and European current regulation and circular economy policies, assessed the Spanish market's potential, and evaluated RenerCycle's strategic positioning opportunities. Results highlight a growing demand for recycling services driven by regulatory pressure and a significant volume of photovoltaic waste expected. While the company faces interna! limitations-such as limited experience in solar panel treatrnent and a small operational structure-its strengths in sustainability, certifications, and strategic location offer competitive advantages. The proposed strategy is built on five pillars: operational efficiency, regulatory compliance, geostrategic positioning, sustainability, and technological im1ovation. Partnerships with logistics and tech firms are suggested to develop a decentralized and scalable infrastructure. In conclusion, the study finds that RenerCycle is well-positioned to become a relevant company in solar panel recycling, contributing to EU climate goals and creating value through circular economy principies.Graduado o Graduada en Administración y Dirección de Empresas por la Universidad Pública de Navarra (Programa Internacional)Enpresen Administrazio eta Zuzendaritzan Graduatua Nafarroako Unibertsitate Publikoan (Nazioarteko Programa
Implied volatility and carbon footprint
No full textEste trabajo de fin de grado analiza la relación entre la huella de carbono de las empresas,
que se miden a través de indicadores como las emisiones absolutas y relativas de CO2, las
puntuaciones ambientales específicas de ESG y otras medidas de las acciones por
clima, y la volatilidad implícita de sus opciones financieras. Basándose en una muestra
de 188 empresas de diferentes sectores de Estados Unidos, y utilizando datos entre 2010
y 2024, se evalúan las características ambientales de una empresa que pueden influir en
la percepción del riesgo de mercado, como se refleja en la VI de las opciones. El estudio
ofrece evidencia empírica de que algunas variables ambientales, especialmente las
relacionadas con el compromiso corporativo y la transparencia climática, pueden tener un
impacto significativo en la volatilidad implícita (VI). Estos resultados sugieren que
sostenibilidad no solo es relevante desde un punto de vista ético, sino también desde una
perspectiva de evaluación financiera y gestión de riesgos.The final degree project analyzes the relationship between the carbon footprint of
companies, which is measured through indicators such as absolute and relative CO2
emissions, as well as specific environmental ESG scores and other indicators of actions
for the climate, and the IV of their financial options. Based on a sample of 188 companies
of the U.S. from different industries, and using data between 2010 and 2024, the
environmental characteristics of a company are evaluated that can influence the
perception of market risk, as reflected in the implied volatility of the options. The study
offers empirical evidence that some environmental variables, especially those related to
corporate commitment and climate transparency, can have a significant impact on implied
volatility (IV). These results suggest that sustainability is not only relevant from an ethical
point of view, but also from a financial assessment and risk management perspective.Graduado o Graduada en Administración y Dirección de Empresas por la Universidad Pública de Navarra (Programa Internacional)Enpresen Administrazio eta Zuzendaritzan Graduatua Nafarroako Unibertsitate Publikoan (Nazioarteko Programa
Agreement between an inertial measurement unit (IMU) algorithm and a photoelectric system for analysing spatiotemporal variables during overground and treadmill running
No full textThe aim of this study was to assess the agreement between running stride variables measured simultaneously with an inertial sensor (MTw IMU) using a specific algorithm, and a floor-based photoelectric (Optojump; OJ) system among well-trained endurance runners, during overground and treadmill runs at speeds ranging from 9 to 21 km∙h-1. Five different filter settings (from 0_0 to 4_4) were used with the OJ to detect the contact event, based on the number of LEDs (from 1 to 5). No significant differences (p > 0.05) were found between the two devices in any of the stride variables when the 4_4 filter was implemented using the OJ. The agreement was good for contact time (CT) and flight time (FT) [r = 0.81–0.93; Typical error of the estimate (TEE%) = 3.2–7.5%], whereas for stride frequency (SF), stride length (SL) and stride time (ST) the agreement was almost perfect (r = 0.91–0.99; TEE% = 0.2–1.7%). The agreement worsened as the number of activated LEDs used to detect the contact event decreased. This suggests that the tested inertial sensor using a specific algorithm can achieve highly precise measurement of spatiotemporal parameters during both overground and treadmill running, compared to the OJ (4_4) system