89,324 research outputs found
Environmental data and cumulative impacts for the Black Sea (files)
No full textIn this repository you can find data to replicate the comparison of cumulative impact approaches, using the Black Sea as a case study, as well as all the outputs. In the manuscript “Comparing methodological choices for environmental cumulative impacts analysis: The Black Sea as a case study” authored by Elena Lloret-Lloret, Maria Grazia Pennino, Francisco Ramirez, Lucia Espasandín Soneira, Sorin Constantin, Camila Artana, Florin Tatui, Natasa Vaidianu and Priscila F. M. Lopes, we explore and compare two methodological approaches for highly resolved spatially explicit environmental cumulative impact analysis. We combined two temporal resolutions (annual vs monthly) and two types of metrics (absolute means vs percent-based of anomalies) resulting in what we would refer to as two approaches: annual mean absolute values vs. percentages of monthly anomalies. Additionally, we employed three different considerations for the vertical component of the environmental input data: surface data, vertically integrated weighted mean, and vertically integrated weighted sum) and together, these factors produce six different scenarios for cumulative impact analysisEnvironmental data downloaded from Copernicus Marine Service. Products: BLKSEA_MULTIYEAR_PHY_007_004 and BLKSEA_MULTIYEAR_BGC_007_005_BAMHBI (Grégoire et al., 2020; Lima et al., 2020). Project under which the work and the other layers have been generated: Romanian Ministry of Research, Innovation and Digitalization (#760054 - JUST4MPA), within the PNRR-III-C9-2022 - I8 call.This work contributes to the Institut de Ciències del Mar "Severo Ochoa Centre of Excellence" accreditation CEX2024-001494-S funded by AEI 10.13039/501100011033 of the Spanish Ministry of Science and InnovationPeer reviewe
Local and regional abundance of exotic plant species on Mediterranean islands: are species traits important? RID F-7454-2011
No full textAim We assess the importance of three relevant and readily obtainable life-history traits (dispersal syndrome, stem height and growth form) and biogeographical origin (European vs. non-European) on the local and regional abundance of over 400 exotic plant species across eight Mediterranean islands. Location The Mediterranean islands of Lesbos, Rhodes, Crete, Malta, Corsica, Sardinia, Majorca and Minorca. Methods We adopt two abundance criteria for each exotic species: the proportion of islands in which the species occurs (regional abundance), and a qualitative estimate of species abundance within each of five islands (local abundance). Subsequently, we assess the relationship between local and regional abundance, as well as the role of key life-history traits on both regional and local abundance. These analyses were undertaken separately for the European exotics and the non-European exotics. Results Only 10.9% of the species occur on more than four islands, and only four species are present on all eight islands. Both local and regional abundances were higher for the non-European than the European species. Local and regional abundances were positively correlated, particularly for exotics with non-European origins. Wind-dispersed species tended to have higher regional abundance than species dispersed by other means but this trend only occurred for local abundance on two islands - Corsica and Majorca. Neither a species' growth form nor its stem height explained trends in regional or local abundance. Conclusions Although wind-dispersed exotics are more widespread in the Mediterranean, plant life-history traits appear to play a lesser role in invasion success than area of biogeographical origin. In general, exotic species of non-European origin were more abundant at both local and regional scales. Invasion patterns should be interpreted at both local and regional scales, but the stochastic nature of biological invasions may limit deterministic interpretations of invasion patterns, especially if islands are studied in isolation
Surgical stabilization of severe flail chest with Judet and Sanchez-Lloret plates. A case report
No full textINTRODUCTION: Flail chest is now usually treated by conservative methods and surgical fixation remainsindicated in selected cases. Different techniques can be used for fixation. The aim of this paper is topresent a case in which Judet and Sanchez-Loret plates were employed and to discuss the usefulness ofthis traditional technique.PRESENTATION OF CASE: A 79-year-old woman was admitted for left thoracic trauma with severe antero-lateral flail chest. She was affected by COPD with chronic respiratory failure, ischemic heart disease,autoimmune thrombocytopenia treated on chronic steroid therapy and severe osteoporosis. CT-scandetected multiple rib fractures, left hemothorax and lung contusions. An initial conservative treatmentof flail chest involved compressive bandage and then internal pneumatic stabilization in ICU, but it failed.The patient underwent successful surgical treatment of the flail chest by fixation of the anterior fracturesfrom the second to the eight rib. Judet and Sanchez-Lloret plates were used. A bilateral pneumoniadeveloped during the rehabilitation period and the patient died two months after operation.DISCUSSION: Judet and Sanchez-Lloret plates represent a traditional technique for fixation of flail chest.This technique is less and less used and progressively replaced by newer materials, especially titaniumplates with screws or intramedullary struts. Our patient had multiple comorbidities and a very fragilebones that advised against use of screws or intramedullary struts.CONCLUSION: Judet and Sanchez-Lloret plates can be still considered a useful tool for the fixation of flailchest in cases of thin and fragile bones
Ensayos estadísticos para la comparación de las pendientes de 2 rectas de calibrado
No full textEn éste Polimedia se describen los pasos para aplicar un ensayo F de comparación de varianzas y un ensayo t de comparación de pendientes de rectas de calibrado.https://polimedia.upv.es/visor/?id=ea2614e0-0e22-11e6-9682-5f29c3f43a15Meseguer Lloret, S. (2016). Ensayos estadísticos para la comparación de las pendientes de 2 rectas de calibrado. https://riunet.upv.es/handle/10251/64157DE
A Highly Active N‐Heterocyclic Carbene Manganese(I) Complex for Selective Electrocatalytic CO <sub>2</sub> Reduction to CO
No full textWe report here the first purely organometallic fac‐[MnI(CO)3(bis‐MeNHC)Br] complex with unprecedented activity for the selective electrocatalytic reduction of CO2 to CO, exceeding 100 turnovers with excellent faradaic yields (ηCO≈95 %) in anhydrous CH3CN. Under the same conditions, a maximum turnover frequency (TOFmax) of 2100 s−1 was measured by cyclic voltammetry, which clearly exceeds the values reported for other manganese‐based catalysts. Moreover, the addition of water leads to the highest TOFmax value (ca. 320 000 s−1) ever reported for a manganese‐based catalyst. A MnI tetracarbonyl intermediate was detected under catalytic conditions for the first time
Ensayos estadísticos para comparar las pendientes de 2 rectas de calibrado: Caso práctico para varianzas homogéneas
No full textEn éste video se detalla un caso práctico de aplicación del ensayo t de comparación de las pendientes de dos rectas de calibrado en el que la aplicación previa del ensayo estadístico F indica que las varianzas de las pendientes son homogéneas.https://polimedia.upv.es/visor/?id=2f27aab0-12b8-11e6-9e65-017b09f74585Meseguer Lloret, S. (2017). Ensayos estadísticos para comparar las pendientes de 2 rectas de calibrado: Caso práctico para varianzas homogéneas. https://riunet.upv.es/handle/10251/84323DE
Electrocatalytic CO2 reduction by aminopyridine cobalt complexes: electronic effect of substituents on the pyridyl ring and mechanistic insights
No full textIn the last decade, several earth-abundant metal-based molecular catalysts have been found highly active for the photochemical or electrochemical CO2 reduction. However, despite their efficiency for the light-driven CO2-to-CO process,1 the electrocatalytic performances of Co complexes containing N4 or N5 ligands are still generally affected by catalyst deactivation,2 large overpotentials3 and low faradaic yields, due to either ligand decomposition or a preferential H2 evolution pathway under acidic conditions.4 To overcome these barriers, design of novel Co catalysts should be coupled to a deep understanding of the electrocatalytic mechanism, based on the characterization of key intermediates formed during the process. 5
Herein, we present a series of novel synthesized [CoII(Y,XPyMetacn)(OTf)2] complexes (1R, Scheme 1) containing N4 tetradentate ligands with general formula Y,XPyMetacn (1-[2′-(4-Y-6-X-pyridyl)methyl]-4,7-dialkyl-1,4,7-triazacyclononane),6 employed as catalysts for the electrochemical reduction of CO2. The introduction of different substituents at the - and -positions of the pyridine allowed us to systematically evaluate the effect of the electronic properties of the ligand on the catalytic activity. As highlighted by the electrochemical data, the redox non-innocent character of the Y,XPyMetacn ligand is extremely sensitive to the substitution at the pyridyl ring, and influences not only the E1/2(CoII/I) value, but also the nature of the reduction event itself, thus leading to different reactivity of the electrochemically generated CoI species towards CO2. Moreover, extensive spectroscopic (NMR) and spectroelectrochemical (IR and UV-Vis) studies were carried out to investigate the intermediates produced in the course of the catalytic process. Theoretical modelling provided also key mechanistic details for the CO2 reduction reaction.
Scheme 1. General structures of the 1R complexes under study
References
1 Z. Guo, S. Cheng, C. Cometto, E. Anxolabéhère-Mallart, S.-M. Ng, C.-C. Ko, G. Liu, L. Chen, M. Robert,T.-C. Lau, J. Am. Chem. Soc. 2016, 138, 9413−9416
2 K.-M. Lam, K.-Y. Wong, S.-M. Yang, C.-M. Che, Dalton Trans. 1995, 1103−1107
3 A. Chapovetsky, T. H. Do, R. Haiges, M. K. Takase, S. C. Marinescu, J. Am. Chem. Soc. 2016, 138, 5765−5768
4 D. C. Lacy, C. C. L. McCrory, J. C. Peters, Inorg. Chem. 2014, 53, 4980−4988
5 H. Sheng, H. Frei, J. Am. Chem. Soc. 2016, 138, 9959−9967
6 a) A. Call, F. Franco, S. Fernandez, N. Kandoth, J. M. Lluis J. Lloret-Fillol, Chem. Sci. 2016, submitted; b) A. Call, Z. Codola, F. Acuna-Pares, J. Lloret-Fillol, Chem. Eur. J. 2014, 20, 6171 – 618
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Unsupervised online anomaly detection in Software Defined Network environments
No full textSoftware Defined Networking (SDN) simplifies network management and significantly reduces operational costs. SDN removes the control plane from forwarding devices (e.g., routers and switches) and centralizes this plane in a controller, enabling the management of the network forwarding decisions by programming the control plane with a high-level language. However, its centralized architecture may be compromised by flooding attacks, such as Distributed Denial of Service (DDoS) and portscan. Facing this challenge, we propose an Intrusion Detection System (IDS) based on online clustering to detect attacks in an evolving SDN network taking advantage of the entropy of source and destination IP addresses and ports. Our proposal is focused on avoiding the demand for labeling and previous knowledge to provide a practical and accurate method to address real-life online scenarios. Moreover, our proposal paves the way for a comprehensive analysis by projecting the cluster's structure over the feature space, providing insights on intensity, seasonality, and attack type. Our experiments were carried out with the DenStream algorithm in several databases attacked by DDoS and portscan with different intensities, durations, and overlapping patterns. When comparing DenStream performance to Half-Space-Trees, an accurate online one-class classification algorithm for anomaly detection, it was possible to expose the capacity of our unsupervised proposal, overcoming the one-class solution, and reaching f-measure rates above 99.60%
Model fitting to account for the weather s impact on wireless propagation at 2.4 GHz
No full text[EN] Usually, users of outdoor wireless local area networks have a good quality of experience and they do not have any complaint about its performance. However, under certain weather conditions, their performance decreases due to influence of meteorological variables on wireless signal propagation and users notice this deterioration through disconnections, delays, data loss, etc. This paper presents the research carried out in order to approach the unsuccessful transmission of different frames at MAC layer from the weather conditions at run time by using mathematic models.This work has been supported by the Vice-Rectorate for Research, Innovation and Transfer through the programme FPI-UPV. The authors would like to thank Borja Opticos and Azimut Electronics for their support.Bri Molinero, D.; Garcia, M.; Lloret, J.; Ramos, F. (2017). Model fitting to account for the weather s impact on wireless propagation at 2.4 GHz. National Academy Science Letters. 40(2):127-130. https://doi.org/10.1007/s40009-016-0520-7S127130402Bianchi C, Meloni A (2007) Natural and man-made terrestrial electromagnetic noise: an outlook. Ann Geophys 50:435–445International Telecommunications Union (2013) Recommendation ITU-R P.676-10: attenuation by atmospheric gasesInternational Telecommunications Union (2013) Recommendation ITU-R P.530-15: propagation data and prediction methods required for the design of terrestrial line-of-sight systemsBri D, Fernández-DiegoM Garcia M, Ramos F, Lloret J (2012) How the weather impacts on the performance of an outdoor WLAN. IEEE Commun Lett 6:1184–1187Bri D, Ramos F, Lloret J, Garcia M (2012) The influence of meteorological variables on the performance of outdoor wireless local area networks. In: IEEE international conference on communications, OttawaBri D, Sendra S, Coll H, Lloret J (2010) How the atmospheric variables affect to the WLAN Datalink layer parameters. In: Advanced international conference on telecommunications, BarcelonaChu CH, Chen YM, Huang YT, Carvalho R, Hsu CC, Chen LJ (2014) Measurement of long-distance Wi-Fi connections: an empirical study. In: IEEE international conference on communications, SydneyOhshima K, Hara H, Hagiwara Y, Terada M (2012) Field investigation of the radio transmission performance and distance in an environmental wireless sensor network. In: International conference on information networking, BaliNadeem F, Leitgeb E, Koudelka O, Kandus TJG (2008) Comparing the rain effects on hybrid network using optical wireless and GHz links. In: International conference on emerging technologies, RawalpindiSchmidt M, Lipson H (2009) Distilling free-form natural laws from experimental data. Science 324:81–85Schmidt M, Lipson H (2013) Eureqa (Version 0.98 beta) [Software] Available: www.nutonian.comBri D, Garcia M, Lloret J, Misic J (2015) Measuring the weather’s impact on MAC layer over 2.4 GHz outdoor radio links. Measurement 61:221–233Yu F, Biswas S (2012) MAC protocol switching: a novel tool for performance adaptation in wireless sensor networks. Netw Protoc Algor 4:69–8
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